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gcc/libstdc++-v3/include/bits/chrono_io.h
Jonathan Wakely d5e352addf libstdc++: Fix std::format for chrono::duration with unsigned rep [PR115668] 
Using std::chrono::abs is only valid if numeric_limits<rep>::is_signed
is true, so using it unconditionally made it ill-formed to format a
duration with an unsigned rep.

The duration formatter might as well negate the duration itself instead
of using chrono::abs, because it already needs to check for a negative
value.

libstdc++-v3/ChangeLog:

	PR libstdc++/115668
	* include/bits/chrono_io.h (formatter<duration<R,P, C>::format):
	Do not use chrono::abs.
	* testsuite/20_util/duration/io.cc: Check formatting a duration
	with unsigned rep.

(cherry picked from commit dafa750c8a6f0a088677871bfaad054881737ab1)
2024-06-28 10:44:00 +01:00

4313 lines
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// <chrono> Formatting -*- C++ -*-
// Copyright The GNU Toolchain Authors.
//
// This file is part of the GNU ISO C++ Library. This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 3, or (at your option)
// any later version.
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// Under Section 7 of GPL version 3, you are granted additional
// permissions described in the GCC Runtime Library Exception, version
// 3.1, as published by the Free Software Foundation.
// You should have received a copy of the GNU General Public License and
// a copy of the GCC Runtime Library Exception along with this program;
// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
// <http://www.gnu.org/licenses/>.
/** @file include/bits/chrono_io.h
* This is an internal header file, included by other library headers.
* Do not attempt to use it directly. @headername{chrono}
*/
#ifndef _GLIBCXX_CHRONO_IO_H
#define _GLIBCXX_CHRONO_IO_H 1
#pragma GCC system_header
#if __cplusplus >= 202002L
#include <sstream> // ostringstream
#include <iomanip> // setw, setfill
#include <format>
#include <charconv> // from_chars
#include <bits/streambuf_iterator.h>
namespace std _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION
namespace chrono
{
/// @addtogroup chrono
/// @{
/// @cond undocumented
namespace __detail
{
// STATICALLY-WIDEN, see C++20 [time.general]
// It doesn't matter for format strings (which can only be char or wchar_t)
// but this returns the narrow string for anything that isn't wchar_t. This
// is done because const char* can be inserted into any ostream type, and
// will be widened at runtime if necessary.
template<typename _CharT>
consteval auto
_Widen(const char* __narrow, const wchar_t* __wide)
{
if constexpr (is_same_v<_CharT, wchar_t>)
return __wide;
else
return __narrow;
}
#define _GLIBCXX_WIDEN_(C, S) ::std::chrono::__detail::_Widen<C>(S, L##S)
#define _GLIBCXX_WIDEN(S) _GLIBCXX_WIDEN_(_CharT, S)
template<typename _Period, typename _CharT>
constexpr basic_string_view<_CharT>
__units_suffix() noexcept
{
// The standard say these are all narrow strings, which would need to
// be widened at run-time when inserted into a wide stream. We use
// STATICALLY-WIDEN to widen at compile-time.
#define _GLIBCXX_UNITS_SUFFIX(period, suffix) \
if constexpr (is_same_v<_Period, period>) \
return _GLIBCXX_WIDEN(suffix); \
else
_GLIBCXX_UNITS_SUFFIX(atto, "as")
_GLIBCXX_UNITS_SUFFIX(femto, "fs")
_GLIBCXX_UNITS_SUFFIX(pico, "ps")
_GLIBCXX_UNITS_SUFFIX(nano, "ns")
_GLIBCXX_UNITS_SUFFIX(milli, "ms")
#if _GLIBCXX_USE_ALT_MICROSECONDS_SUFFIX
// Deciding this at compile-time is wrong, maybe use nl_langinfo(CODESET)
// to check runtime environment and return u8"\u00b5s", "\xb5s", or "us".
_GLIBCXX_UNITS_SUFFIX(micro, "\u00b5s")
#else
_GLIBCXX_UNITS_SUFFIX(micro, "us")
#endif
_GLIBCXX_UNITS_SUFFIX(centi, "cs")
_GLIBCXX_UNITS_SUFFIX(deci, "ds")
_GLIBCXX_UNITS_SUFFIX(ratio<1>, "s")
_GLIBCXX_UNITS_SUFFIX(deca, "das")
_GLIBCXX_UNITS_SUFFIX(hecto, "hs")
_GLIBCXX_UNITS_SUFFIX(kilo, "ks")
_GLIBCXX_UNITS_SUFFIX(mega, "Ms")
_GLIBCXX_UNITS_SUFFIX(giga, "Gs")
_GLIBCXX_UNITS_SUFFIX(tera, "Ts")
_GLIBCXX_UNITS_SUFFIX(tera, "Ts")
_GLIBCXX_UNITS_SUFFIX(peta, "Ps")
_GLIBCXX_UNITS_SUFFIX(exa, "Es")
_GLIBCXX_UNITS_SUFFIX(ratio<60>, "min")
_GLIBCXX_UNITS_SUFFIX(ratio<3600>, "h")
_GLIBCXX_UNITS_SUFFIX(ratio<86400>, "d")
#undef _GLIBCXX_UNITS_SUFFIX
return {};
}
template<typename _Period, typename _CharT, typename _Out>
inline _Out
__fmt_units_suffix(_Out __out) noexcept
{
if (auto __s = __detail::__units_suffix<_Period, _CharT>(); __s.size())
return __format::__write(std::move(__out), __s);
else if constexpr (_Period::den == 1)
return std::format_to(std::move(__out), _GLIBCXX_WIDEN("[{}]s"),
(uintmax_t)_Period::num);
else
return std::format_to(std::move(__out), _GLIBCXX_WIDEN("[{}/{}]s"),
(uintmax_t)_Period::num,
(uintmax_t)_Period::den);
}
} // namespace __detail
/// @endcond
/** Write a `chrono::duration` to an ostream.
*
* @since C++20
*/
template<typename _CharT, typename _Traits,
typename _Rep, typename _Period>
inline basic_ostream<_CharT, _Traits>&
operator<<(std::basic_ostream<_CharT, _Traits>& __os,
const duration<_Rep, _Period>& __d)
{
using _Out = ostreambuf_iterator<_CharT, _Traits>;
using period = typename _Period::type;
std::basic_ostringstream<_CharT, _Traits> __s;
__s.flags(__os.flags());
__s.imbue(__os.getloc());
__s.precision(__os.precision());
__s << __d.count();
__detail::__fmt_units_suffix<period, _CharT>(_Out(__s));
__os << std::move(__s).str();
return __os;
}
/// @cond undocumented
namespace __detail
{
// An unspecified type returned by `chrono::local_time_format`.
template<typename _Duration>
struct __local_time_fmt
{
local_time<_Duration> _M_time;
const string* _M_abbrev;
const seconds* _M_offset_sec;
};
struct __local_fmt_t;
}
/// @endcond
/** Return an object that asssociates timezone info with a local time.
*
* A `chrono::local_time` object has no timezone associated with it. This
* function creates an object that allows formatting a `local_time` as
* though it refers to a timezone with the given abbreviated name and
* offset from UTC.
*
* @since C++20
*/
template<typename _Duration>
inline __detail::__local_time_fmt<_Duration>
local_time_format(local_time<_Duration> __time,
const string* __abbrev = nullptr,
const seconds* __offset_sec = nullptr)
{ return {__time, __abbrev, __offset_sec}; }
/// @}
} // namespace chrono
/// @cond undocumented
namespace __format
{
[[noreturn,__gnu__::__always_inline__]]
inline void
__no_timezone_available()
{ __throw_format_error("format error: no timezone available for %Z or %z"); }
[[noreturn,__gnu__::__always_inline__]]
inline void
__not_valid_for_duration()
{ __throw_format_error("format error: chrono-format-spec not valid for "
"chrono::duration"); }
[[noreturn,__gnu__::__always_inline__]]
inline void
__invalid_chrono_spec()
{ __throw_format_error("format error: chrono-format-spec not valid for "
"argument type"); }
template<typename _CharT>
struct _ChronoSpec : _Spec<_CharT>
{
basic_string_view<_CharT> _M_chrono_specs;
};
// Represents the information provided by a chrono type.
// e.g. month_weekday has month and weekday but no year or time of day,
// hh_mm_ss has time of day but no date, sys_time is time_point+timezone.
enum _ChronoParts {
_Year = 1, _Month = 2, _Day = 4, _Weekday = 8, _TimeOfDay = 16,
_TimeZone = 32,
_Date = _Year | _Month | _Day | _Weekday,
_DateTime = _Date | _TimeOfDay,
_ZonedDateTime = _DateTime | _TimeZone,
_Duration = 128 // special case
};
constexpr _ChronoParts
operator|(_ChronoParts __x, _ChronoParts __y) noexcept
{ return static_cast<_ChronoParts>((int)__x | (int)__y); }
constexpr _ChronoParts&
operator|=(_ChronoParts& __x, _ChronoParts __y) noexcept
{ return __x = __x | __y; }
// TODO rename this to chrono::__formatter? or chrono::__detail::__formatter?
template<typename _CharT>
struct __formatter_chrono
{
using __string_view = basic_string_view<_CharT>;
using __string = basic_string<_CharT>;
template<typename _ParseContext>
constexpr typename _ParseContext::iterator
_M_parse(_ParseContext& __pc, _ChronoParts __parts)
{
auto __first = __pc.begin();
auto __last = __pc.end();
_ChronoSpec<_CharT> __spec{};
auto __finalize = [this, &__spec] {
_M_spec = __spec;
};
auto __finished = [&] {
if (__first == __last || *__first == '}')
{
__finalize();
return true;
}
return false;
};
if (__finished())
return __first;
__first = __spec._M_parse_fill_and_align(__first, __last);
if (__finished())
return __first;
__first = __spec._M_parse_width(__first, __last, __pc);
if (__finished())
return __first;
if (__parts & _ChronoParts::_Duration)
{
__first = __spec._M_parse_precision(__first, __last, __pc);
if (__finished())
return __first;
}
__first = __spec._M_parse_locale(__first, __last);
if (__finished())
return __first;
// Everything up to the end of the string or the first '}' is a
// chrono-specs string. Check it is valid.
{
__string_view __str(__first, __last - __first);
auto __end = __str.find('}');
if (__end != __str.npos)
{
__str.remove_suffix(__str.length() - __end);
__last = __first + __end;
}
if (__str.find('{') != __str.npos)
__throw_format_error("chrono format error: '{' in chrono-specs");
}
// Parse chrono-specs in [first,last), checking each conversion-spec
// against __parts (so fail for %Y if no year in parts).
// Save range in __spec._M_chrono_specs.
const auto __chrono_specs = __first++; // Skip leading '%'
if (*__chrono_specs != '%')
__throw_format_error("chrono format error: no '%' at start of "
"chrono-specs");
_CharT __mod{};
bool __conv = true;
int __needed = 0;
while (__first != __last)
{
enum _Mods { _Mod_none, _Mod_E, _Mod_O, _Mod_E_O };
_Mods __allowed_mods = _Mod_none;
_CharT __c = *__first++;
switch (__c)
{
case 'a':
case 'A':
__needed = _Weekday;
break;
case 'b':
case 'h':
case 'B':
__needed = _Month;
break;
case 'c':
__needed = _DateTime;
__allowed_mods = _Mod_E;
break;
case 'C':
__needed = _Year;
__allowed_mods = _Mod_E;
break;
case 'd':
case 'e':
__needed = _Day;
__allowed_mods = _Mod_O;
break;
case 'D':
case 'F':
__needed = _Date;
break;
case 'g':
case 'G':
__needed = _Date;
break;
case 'H':
case 'I':
__needed = _TimeOfDay;
__allowed_mods = _Mod_O;
break;
case 'j':
if (!(__parts & _Duration))
__needed = _Date;
break;
case 'm':
__needed = _Month;
__allowed_mods = _Mod_O;
break;
case 'M':
__needed = _TimeOfDay;
__allowed_mods = _Mod_O;
break;
case 'p':
case 'r':
case 'R':
case 'T':
__needed = _TimeOfDay;
break;
case 'q':
case 'Q':
__needed = _Duration;
break;
case 'S':
__needed = _TimeOfDay;
__allowed_mods = _Mod_O;
break;
case 'u':
case 'w':
__needed = _Weekday;
__allowed_mods = _Mod_O;
break;
case 'U':
case 'V':
case 'W':
__needed = _Date;
__allowed_mods = _Mod_O;
break;
case 'x':
__needed = _Date;
__allowed_mods = _Mod_E;
break;
case 'X':
__needed = _TimeOfDay;
__allowed_mods = _Mod_E;
break;
case 'y':
__needed = _Year;
__allowed_mods = _Mod_E_O;
break;
case 'Y':
__needed = _Year;
__allowed_mods = _Mod_E;
break;
case 'z':
__needed = _TimeZone;
__allowed_mods = _Mod_E_O;
break;
case 'Z':
__needed = _TimeZone;
break;
case 'n':
case 't':
case '%':
break;
case 'O':
case 'E':
if (__mod) [[unlikely]]
{
__allowed_mods = _Mod_none;
break;
}
__mod = __c;
continue;
default:
__throw_format_error("chrono format error: invalid "
" specifier in chrono-specs");
}
if ((__mod == 'E' && !(__allowed_mods & _Mod_E))
|| (__mod == 'O' && !(__allowed_mods & _Mod_O)))
__throw_format_error("chrono format error: invalid "
" modifier in chrono-specs");
__mod = _CharT();
if ((__parts & __needed) != __needed)
__throw_format_error("chrono format error: format argument "
"does not contain the information "
"required by the chrono-specs");
// Scan for next '%', ignoring literal-chars before it.
size_t __pos = __string_view(__first, __last - __first).find('%');
if (__pos == 0)
++__first;
else
{
if (__pos == __string_view::npos)
{
__first = __last;
__conv = false;
}
else
__first += __pos + 1;
}
}
// Check for a '%' conversion-spec without a type.
if (__conv || __mod != _CharT())
__throw_format_error("chrono format error: unescaped '%' in "
"chrono-specs");
_M_spec = __spec;
_M_spec._M_chrono_specs
= __string_view(__chrono_specs, __first - __chrono_specs);
return __first;
}
// TODO this function template is instantiated for every different _Tp.
// Consider creating a polymorphic interface for calendar types so
// that we instantiate fewer different specializations. Similar to
// _Sink_iter for std::format. Replace each _S_year, _S_day etc. with
// member functions of that type.
template<typename _Tp, typename _FormatContext>
typename _FormatContext::iterator
_M_format(const _Tp& __t, _FormatContext& __fc,
bool __is_neg = false) const
{
auto __first = _M_spec._M_chrono_specs.begin();
const auto __last = _M_spec._M_chrono_specs.end();
if (__first == __last)
return _M_format_to_ostream(__t, __fc, __is_neg);
_Sink_iter<_CharT> __out;
__format::_Str_sink<_CharT> __sink;
bool __write_direct = false;
if constexpr (is_same_v<typename _FormatContext::iterator,
_Sink_iter<_CharT>>)
{
if (_M_spec._M_width_kind == __format::_WP_none)
{
__out = __fc.out();
__write_direct = true;
}
else
__out = __sink.out();
}
else
__out = __sink.out();
// formatter<duration> passes the correct value of __is_neg
// for durations but for hh_mm_ss we decide it here.
if constexpr (__is_specialization_of<_Tp, chrono::hh_mm_ss>)
__is_neg = __t.is_negative();
auto __print_sign = [&__is_neg, &__out] {
if constexpr (chrono::__is_duration_v<_Tp>
|| __is_specialization_of<_Tp, chrono::hh_mm_ss>)
if (__is_neg)
{
*__out++ = _S_plus_minus[1];
__is_neg = false;
}
return std::move(__out);
};
// Characters to output for "%n", "%t" and "%%" specifiers.
constexpr const _CharT* __literals = _GLIBCXX_WIDEN("\n\t%");
++__first; // Skip leading '%' at start of chrono-specs.
_CharT __mod{};
do
{
_CharT __c = *__first++;
switch (__c)
{
case 'a':
case 'A':
__out = _M_a_A(__t, std::move(__out), __fc, __c == 'A');
break;
case 'b':
case 'h':
case 'B':
__out = _M_b_B(__t, std::move(__out), __fc, __c == 'B');
break;
case 'c':
__out = _M_c(__t, std::move(__out), __fc, __mod == 'E');
break;
case 'C':
case 'y':
case 'Y':
__out = _M_C_y_Y(__t, std::move(__out), __fc, __c, __mod);
break;
case 'd':
case 'e':
__out = _M_d_e(__t, std::move(__out), __fc, __c, __mod == 'O');
break;
case 'D':
__out = _M_D(__t, std::move(__out), __fc);
break;
case 'F':
__out = _M_F(__t, std::move(__out), __fc);
break;
case 'g':
case 'G':
__out = _M_g_G(__t, std::move(__out), __fc, __c == 'G');
break;
case 'H':
case 'I':
__out = _M_H_I(__t, __print_sign(), __fc, __c, __mod == 'O');
break;
case 'j':
__out = _M_j(__t, __print_sign(), __fc);
break;
case 'm':
__out = _M_m(__t, std::move(__out), __fc, __mod == 'O');
break;
case 'M':
__out = _M_M(__t, __print_sign(), __fc, __mod == 'O');
break;
case 'p':
__out = _M_p(__t, std::move(__out), __fc);
break;
case 'q':
__out = _M_q(__t, std::move(__out), __fc);
break;
case 'Q':
// %Q The duration's numeric value.
if constexpr (chrono::__is_duration_v<_Tp>)
__out = std::format_to(__print_sign(), _S_empty_spec,
__t.count());
else
__throw_format_error("chrono format error: argument is "
"not a duration");
break;
case 'r':
__out = _M_r(__t, __print_sign(), __fc);
break;
case 'R':
case 'T':
__out = _M_R_T(__t, __print_sign(), __fc, __c == 'T');
break;
case 'S':
__out = _M_S(__t, __print_sign(), __fc, __mod == 'O');
break;
case 'u':
case 'w':
__out = _M_u_w(__t, std::move(__out), __fc, __c, __mod == 'O');
break;
case 'U':
case 'V':
case 'W':
__out = _M_U_V_W(__t, std::move(__out), __fc, __c,
__mod == 'O');
break;
case 'x':
__out = _M_x(__t, std::move(__out), __fc, __mod == 'E');
break;
case 'X':
__out = _M_X(__t, __print_sign(), __fc, __mod == 'E');
break;
case 'z':
__out = _M_z(__t, std::move(__out), __fc, (bool)__mod);
break;
case 'Z':
__out = _M_Z(__t, std::move(__out), __fc);
break;
case 'n':
*__out++ = __literals[0];
break;
case 't':
*__out++ = __literals[1];
break;
case '%':
*__out++ = __literals[2];
break;
case 'O':
case 'E':
__mod = __c;
continue;
case '}':
__first = __last;
break;
}
__mod = _CharT();
// Scan for next '%' and write out everything before it.
__string_view __str(__first, __last - __first);
size_t __pos = __str.find('%');
if (__pos == 0)
++__first;
else
{
if (__pos == __str.npos)
__first = __last;
else
{
__str.remove_suffix(__str.length() - __pos);
__first += __pos + 1;
}
__out = __format::__write(std::move(__out), __str);
}
}
while (__first != __last);
if constexpr (is_same_v<typename _FormatContext::iterator,
_Sink_iter<_CharT>>)
if (__write_direct)
return __out;
auto __str = std::move(__sink).get();
return __format::__write_padded_as_spec(__str, __str.size(),
__fc, _M_spec);
}
_ChronoSpec<_CharT> _M_spec;
private:
// Return the formatting locale.
template<typename _FormatContext>
std::locale
_M_locale(_FormatContext& __fc) const
{
if (!_M_spec._M_localized)
return std::locale::classic();
else
return __fc.locale();
}
// Format for empty chrono-specs, e.g. "{}" (C++20 [time.format] p6).
// TODO: consider moving body of every operator<< into this function
// and use std::format("{}", t) to implement those operators. That
// would avoid std::format("{}", t) calling operator<< which calls
// std::format again.
template<typename _Tp, typename _FormatContext>
typename _FormatContext::iterator
_M_format_to_ostream(const _Tp& __t, _FormatContext& __fc,
bool __is_neg) const
{
using ::std::chrono::__detail::__utc_leap_second;
using ::std::chrono::__detail::__local_time_fmt;
if constexpr (__is_specialization_of<_Tp, __local_time_fmt>)
return _M_format_to_ostream(__t._M_time, __fc, false);
else
{
basic_ostringstream<_CharT> __os;
__os.imbue(_M_locale(__fc));
if constexpr (__is_specialization_of<_Tp, __utc_leap_second>)
__os << __t._M_date << ' ' << __t._M_time;
else if constexpr (chrono::__is_time_point_v<_Tp>)
{
// Need to be careful here because not all specializations
// of chrono::sys_time can be written to an ostream.
// For the specializations of time_point that can be
// formatted with an empty chrono-specs, either it's a
// sys_time with period greater or equal to days:
if constexpr (is_convertible_v<_Tp, chrono::sys_days>)
__os << _S_date(__t);
else // Or it's formatted as "{:L%F %T}":
{
auto __days = chrono::floor<chrono::days>(__t);
__os << chrono::year_month_day(__days) << ' '
<< chrono::hh_mm_ss(__t - __days);
}
}
else
{
if constexpr (chrono::__is_duration_v<_Tp>)
if (__is_neg) [[unlikely]]
__os << _S_plus_minus[1];
__os << __t;
}
auto __str = std::move(__os).str();
return __format::__write_padded_as_spec(__str, __str.size(),
__fc, _M_spec);
}
}
static constexpr const _CharT* _S_chars
= _GLIBCXX_WIDEN("0123456789+-:/ {}");
static constexpr const _CharT* _S_plus_minus = _S_chars + 10;
static constexpr _CharT _S_colon = _S_chars[12];
static constexpr _CharT _S_slash = _S_chars[13];
static constexpr _CharT _S_space = _S_chars[14];
static constexpr const _CharT* _S_empty_spec = _S_chars + 15;
template<typename _Tp, typename _FormatContext>
typename _FormatContext::iterator
_M_a_A(const _Tp& __t, typename _FormatContext::iterator __out,
_FormatContext& __ctx, bool __full) const
{
// %a Locale's abbreviated weekday name.
// %A Locale's full weekday name.
chrono::weekday __wd = _S_weekday(__t);
if (!__wd.ok())
__throw_format_error("format error: invalid weekday");
locale __loc = _M_locale(__ctx);
const auto& __tp = use_facet<__timepunct<_CharT>>(__loc);
const _CharT* __days[7];
if (__full)
__tp._M_days(__days);
else
__tp._M_days_abbreviated(__days);
__string_view __str(__days[__wd.c_encoding()]);
return __format::__write(std::move(__out), __str);
}
template<typename _Tp, typename _FormatContext>
typename _FormatContext::iterator
_M_b_B(const _Tp& __t, typename _FormatContext::iterator __out,
_FormatContext& __ctx, bool __full) const
{
// %b Locale's abbreviated month name.
// %B Locale's full month name.
chrono::month __m = _S_month(__t);
if (!__m.ok())
__throw_format_error("format error: invalid month");
locale __loc = _M_locale(__ctx);
const auto& __tp = use_facet<__timepunct<_CharT>>(__loc);
const _CharT* __months[12];
if (__full)
__tp._M_months(__months);
else
__tp._M_months_abbreviated(__months);
__string_view __str(__months[(unsigned)__m - 1]);
return __format::__write(std::move(__out), __str);
}
template<typename _Tp, typename _FormatContext>
typename _FormatContext::iterator
_M_c(const _Tp& __tt, typename _FormatContext::iterator __out,
_FormatContext& __ctx, bool __mod = false) const
{
// %c Locale's date and time representation.
// %Ec Locale's alternate date and time representation.
auto __t = _S_floor_seconds(__tt);
locale __loc = _M_locale(__ctx);
const auto& __tp = use_facet<__timepunct<_CharT>>(__loc);
const _CharT* __formats[2];
__tp._M_date_time_formats(__formats);
const _CharT* __rep = __formats[__mod];
if (!*__rep)
__rep = _GLIBCXX_WIDEN("%a %b %e %H:%M:%S %Y");
basic_string<_CharT> __fmt(_S_empty_spec);
__fmt.insert(1u, 1u, _S_colon);
__fmt.insert(2u, __rep);
return std::vformat_to(std::move(__out), __loc, __fmt,
std::make_format_args<_FormatContext>(__t));
}
template<typename _Tp, typename _FormatContext>
typename _FormatContext::iterator
_M_C_y_Y(const _Tp& __t, typename _FormatContext::iterator __out,
_FormatContext& __ctx, _CharT __conv, _CharT __mod = 0) const
{
// %C Year divided by 100 using floored division.
// %EC Locale's alternative preresentation of the century (era name).
// %y Last two decimal digits of the year.
// %Oy Locale's alternative representation.
// %Ey Locale's alternative representation of offset from %EC.
// %Y Year as a decimal number.
// %EY Locale's alternative full year representation.
chrono::year __y = _S_year(__t);
if (__mod) [[unlikely]]
{
struct tm __tm{};
__tm.tm_year = (int)__y - 1900;
return _M_locale_fmt(std::move(__out), _M_locale(__ctx), __tm,
__conv, __mod);
}
basic_string<_CharT> __s;
int __yi = (int)__y;
const bool __is_neg = __yi < 0;
__yi = __builtin_abs(__yi);
if (__conv == 'Y' || __conv == 'C')
{
int __ci = __yi / 100;
if (__is_neg) [[unlikely]]
{
__s.assign(1, _S_plus_minus[1]);
// For floored division -123//100 is -2 and -100//100 is -1
if (__conv == 'C' && (__ci * 100) != __yi)
++__ci;
}
if (__ci >= 100) [[unlikely]]
{
__s += std::format(_S_empty_spec, __ci / 100);
__ci %= 100;
}
__s += _S_two_digits(__ci);
}
if (__conv == 'Y' || __conv == 'y')
__s += _S_two_digits(__yi % 100);
return __format::__write(std::move(__out), __string_view(__s));
}
template<typename _Tp, typename _FormatContext>
typename _FormatContext::iterator
_M_D(const _Tp& __t, typename _FormatContext::iterator __out,
_FormatContext&) const
{
auto __ymd = _S_date(__t);
basic_string<_CharT> __s;
#if ! _GLIBCXX_USE_CXX11_ABI
__s.reserve(8);
#endif
__s = _S_two_digits((unsigned)__ymd.month());
__s += _S_slash;
__s += _S_two_digits((unsigned)__ymd.day());
__s += _S_slash;
__s += _S_two_digits(__builtin_abs((int)__ymd.year()) % 100);
return __format::__write(std::move(__out), __string_view(__s));
}
template<typename _Tp, typename _FormatContext>
typename _FormatContext::iterator
_M_d_e(const _Tp& __t, typename _FormatContext::iterator __out,
_FormatContext& __ctx, _CharT __conv, bool __mod = false) const
{
// %d The day of month as a decimal number.
// %Od Locale's alternative representation.
// %e Day of month as decimal number, padded with space.
// %Oe Locale's alternative digits.
chrono::day __d = _S_day(__t);
unsigned __i = (unsigned)__d;
if (__mod) [[unlikely]]
{
struct tm __tm{};
__tm.tm_mday = __i;
return _M_locale_fmt(std::move(__out), _M_locale(__ctx), __tm,
(char)__conv, 'O');
}
auto __sv = _S_two_digits(__i);
_CharT __buf[2];
if (__conv == _CharT('e') && __i < 10)
{
__buf[0] = _S_space;
__buf[1] = __sv[1];
__sv = {__buf, 2};
}
return __format::__write(std::move(__out), __sv);
}
template<typename _Tp, typename _FormatContext>
typename _FormatContext::iterator
_M_F(const _Tp& __t, typename _FormatContext::iterator __out,
_FormatContext&) const
{
auto __ymd = _S_date(__t);
auto __s = std::format(_GLIBCXX_WIDEN("{:04d}- - "),
(int)__ymd.year());
auto __sv = _S_two_digits((unsigned)__ymd.month());
__s[__s.size() - 5] = __sv[0];
__s[__s.size() - 4] = __sv[1];
__sv = _S_two_digits((unsigned)__ymd.day());
__s[__s.size() - 2] = __sv[0];
__s[__s.size() - 1] = __sv[1];
__sv = __s;
return __format::__write(std::move(__out), __sv);
}
template<typename _Tp, typename _FormatContext>
typename _FormatContext::iterator
_M_g_G(const _Tp& __t, typename _FormatContext::iterator __out,
_FormatContext& __ctx, bool __full) const
{
// %g last two decimal digits of the ISO week-based year.
// %G ISO week-based year.
using namespace chrono;
auto __d = _S_days(__t);
// Move to nearest Thursday:
__d -= (weekday(__d) - Monday) - days(3);
// ISO week-based year is the year that contains that Thursday:
year __y = year_month_day(__d).year();
return _M_C_y_Y(__y, std::move(__out), __ctx, "yY"[__full]);
}
template<typename _Tp, typename _FormatContext>
typename _FormatContext::iterator
_M_H_I(const _Tp& __t, typename _FormatContext::iterator __out,
_FormatContext& __ctx, _CharT __conv, bool __mod = false) const
{
// %H The hour (24-hour clock) as a decimal number.
// %OH Locale's alternative representation.
// %I The hour (12-hour clock) as a decimal number.
// %OI Locale's alternative representation.
const auto __hms = _S_hms(__t);
int __i = __hms.hours().count();
if (__mod) [[unlikely]]
{
struct tm __tm{};
__tm.tm_hour = __i;
return _M_locale_fmt(std::move(__out), _M_locale(__ctx), __tm,
(char)__conv, 'O');
}
if (__conv == _CharT('I'))
{
if (__i == 0)
__i = 12;
else if (__i > 12)
__i -= 12;
}
return __format::__write(std::move(__out), _S_two_digits(__i));
}
template<typename _Tp, typename _FormatContext>
typename _FormatContext::iterator
_M_j(const _Tp& __t, typename _FormatContext::iterator __out,
_FormatContext&) const
{
if constexpr (chrono::__is_duration_v<_Tp>)
{
// Decimal number of days, without padding.
unsigned __d = chrono::duration_cast<chrono::days>(__t).count();
return std::format_to(std::move(__out), _S_empty_spec, __d);
}
else
{
// Day of the year as a decimal number, padding with zero.
using namespace chrono;
auto __day = _S_days(__t);
auto __ymd = _S_date(__t);
days __d;
// See "Calculating Ordinal Dates" at
// https://github.com/HowardHinnant/date/wiki/Examples-and-Recipes
if constexpr (is_same_v<typename decltype(__day)::clock, local_t>)
__d = __day - local_days(__ymd.year()/January/0);
else
__d = __day - sys_days(__ymd.year()/January/0);
return std::format_to(std::move(__out), _GLIBCXX_WIDEN("{:03d}"),
__d.count());
}
}
template<typename _Tp, typename _FormatContext>
typename _FormatContext::iterator
_M_m(const _Tp& __t, typename _FormatContext::iterator __out,
_FormatContext& __ctx, bool __mod) const
{
// %m month as a decimal number.
// %Om Locale's alternative representation.
auto __m = _S_month(__t);
auto __i = (unsigned)__m;
if (__mod) [[unlikely]] // %Om
{
struct tm __tm{};
__tm.tm_mon = __i - 1;
return _M_locale_fmt(std::move(__out), _M_locale(__ctx), __tm,
'm', 'O');
}
return __format::__write(std::move(__out), _S_two_digits(__i));
}
template<typename _Tp, typename _FormatContext>
typename _FormatContext::iterator
_M_M(const _Tp& __t, typename _FormatContext::iterator __out,
_FormatContext& __ctx, bool __mod) const
{
// %M The minute as a decimal number.
// %OM Locale's alternative representation.
auto __m = _S_hms(__t).minutes();
auto __i = __m.count();
if (__mod) [[unlikely]] // %OM
{
struct tm __tm{};
__tm.tm_min = __i;
return _M_locale_fmt(std::move(__out), _M_locale(__ctx), __tm,
'M', 'O');
}
return __format::__write(std::move(__out), _S_two_digits(__i));
}
template<typename _Tp, typename _FormatContext>
typename _FormatContext::iterator
_M_p(const _Tp& __t, typename _FormatContext::iterator __out,
_FormatContext& __ctx) const
{
// %p The locale's equivalent of the AM/PM designations.
auto __hms = _S_hms(__t);
locale __loc = _M_locale(__ctx);
const auto& __tp = use_facet<__timepunct<_CharT>>(__loc);
const _CharT* __ampm[2];
__tp._M_am_pm(__ampm);
return std::format_to(std::move(__out), _S_empty_spec,
__ampm[__hms.hours().count() >= 12]);
}
template<typename _Tp, typename _FormatContext>
typename _FormatContext::iterator
_M_q(const _Tp&, typename _FormatContext::iterator __out,
_FormatContext&) const
{
// %q The duration's unit suffix
if constexpr (!chrono::__is_duration_v<_Tp>)
__throw_format_error("format error: argument is not a duration");
else
{
namespace __d = chrono::__detail;
using period = typename _Tp::period;
return __d::__fmt_units_suffix<period, _CharT>(std::move(__out));
}
}
// %Q handled in _M_format
template<typename _Tp, typename _FormatContext>
typename _FormatContext::iterator
_M_r(const _Tp& __tt, typename _FormatContext::iterator __out,
_FormatContext& __ctx) const
{
// %r locale's 12-hour clock time.
auto __t = _S_floor_seconds(__tt);
locale __loc = _M_locale(__ctx);
const auto& __tp = use_facet<__timepunct<_CharT>>(__loc);
const _CharT* __ampm_fmt;
__tp._M_am_pm_format(&__ampm_fmt);
basic_string<_CharT> __fmt(_S_empty_spec);
__fmt.insert(1u, 1u, _S_colon);
__fmt.insert(2u, __ampm_fmt);
return std::vformat_to(std::move(__out), __fmt,
std::make_format_args<_FormatContext>(__t));
}
template<typename _Tp, typename _FormatContext>
typename _FormatContext::iterator
_M_R_T(const _Tp& __t, typename _FormatContext::iterator __out,
_FormatContext& __ctx, bool __secs) const
{
// %R Equivalent to %H:%M
// %T Equivalent to %H:%M:%S
auto __hms = _S_hms(__t);
auto __s = std::format(_GLIBCXX_WIDEN("{:02d}:00"),
__hms.hours().count());
auto __sv = _S_two_digits(__hms.minutes().count());
__s[__s.size() - 2] = __sv[0];
__s[__s.size() - 1] = __sv[1];
__sv = __s;
__out = __format::__write(std::move(__out), __sv);
if (__secs)
{
*__out++ = _S_colon;
__out = _M_S(__hms, std::move(__out), __ctx);
}
return __out;
}
template<typename _Tp, typename _FormatContext>
typename _FormatContext::iterator
_M_S(const _Tp& __t, typename _FormatContext::iterator __out,
_FormatContext& __ctx, bool __mod = false) const
{
// %S Seconds as a decimal number.
// %OS The locale's alternative representation.
auto __hms = _S_hms(__t);
if (__mod) [[unlikely]] // %OS
{
struct tm __tm{};
__tm.tm_sec = (int)__hms.seconds().count();
return _M_locale_fmt(std::move(__out), _M_locale(__ctx), __tm,
'S', 'O');
}
if constexpr (__hms.fractional_width == 0)
__out = __format::__write(std::move(__out),
_S_two_digits(__hms.seconds().count()));
else
{
locale __loc = _M_locale(__ctx);
auto __s = __hms.seconds();
auto __ss = __hms.subseconds();
using rep = typename decltype(__ss)::rep;
if constexpr (is_floating_point_v<rep>)
{
chrono::duration<rep> __fs = __s + __ss;
__out = std::format_to(std::move(__out), __loc,
_GLIBCXX_WIDEN("{:#0{}.{}Lf}"),
__fs.count(),
3 + __hms.fractional_width,
__hms.fractional_width);
}
else
{
const auto& __np
= use_facet<numpunct<_CharT>>(__loc);
__out = __format::__write(std::move(__out),
_S_two_digits(__s.count()));
*__out++ = __np.decimal_point();
if constexpr (is_integral_v<rep>)
__out = std::format_to(std::move(__out),
_GLIBCXX_WIDEN("{:0{}}"),
__ss.count(),
__hms.fractional_width);
else
{
auto __str = std::format(_S_empty_spec, __ss.count());
__out = std::format_to(_GLIBCXX_WIDEN("{:0>{}s}"),
__str,
__hms.fractional_width);
}
}
}
return __out;
}
// %t handled in _M_format
template<typename _Tp, typename _FormatContext>
typename _FormatContext::iterator
_M_u_w(const _Tp& __t, typename _FormatContext::iterator __out,
_FormatContext& __ctx, _CharT __conv, bool __mod = false) const
{
// %u ISO weekday as a decimal number (1-7), where Monday is 1.
// %Ou Locale's alternative numeric rep.
// %w Weekday as a decimal number (0-6), where Sunday is 0.
// %Ow Locale's alternative numeric rep.
chrono::weekday __wd = _S_weekday(__t);
if (__mod) [[unlikely]]
{
struct tm __tm{};
__tm.tm_wday = __wd.c_encoding();
return _M_locale_fmt(std::move(__out), _M_locale(__ctx), __tm,
(char)__conv, 'O');
}
unsigned __wdi = __conv == 'u' ? __wd.iso_encoding()
: __wd.c_encoding();
const _CharT __d = _S_digit(__wdi);
return __format::__write(std::move(__out), __string_view(&__d, 1));
}
template<typename _Tp, typename _FormatContext>
typename _FormatContext::iterator
_M_U_V_W(const _Tp& __t, typename _FormatContext::iterator __out,
_FormatContext& __ctx, _CharT __conv, bool __mod = false) const
{
// %U Week number of the year as a decimal number, from first Sunday.
// %OU Locale's alternative numeric rep.
// %V ISO week-based week number as a decimal number.
// %OV Locale's alternative numeric rep.
// %W Week number of the year as a decimal number, from first Monday.
// %OW Locale's alternative numeric rep.
using namespace chrono;
auto __d = _S_days(__t);
using _TDays = decltype(__d); // Either sys_days or local_days.
if (__mod) [[unlikely]]
{
const year_month_day __ymd(__d);
const year __y = __ymd.year();
struct tm __tm{};
__tm.tm_year = (int)__y - 1900;
__tm.tm_yday = (__d - _TDays(__y/January/1)).count();
__tm.tm_wday = weekday(__d).c_encoding();
return _M_locale_fmt(std::move(__out), _M_locale(__ctx), __tm,
(char)__conv, 'O');
}
_TDays __first; // First day of week 1.
if (__conv == 'V') // W01 begins on Monday before first Thursday.
{
// Move to nearest Thursday:
__d -= (weekday(__d) - Monday) - days(3);
// ISO week of __t is number of weeks since January 1 of the
// same year as that nearest Thursday.
__first = _TDays(year_month_day(__d).year()/January/1);
}
else
{
year __y;
if constexpr (requires { __t.year(); })
__y = __t.year();
else
__y = year_month_day(__d).year();
const weekday __weekstart = __conv == 'U' ? Sunday : Monday;
__first = _TDays(__y/January/__weekstart[1]);
}
auto __weeks = chrono::floor<weeks>(__d - __first);
__string_view __sv = _S_two_digits(__weeks.count() + 1);
return __format::__write(std::move(__out), __sv);
}
template<typename _Tp, typename _FormatContext>
typename _FormatContext::iterator
_M_x(const _Tp& __t, typename _FormatContext::iterator __out,
_FormatContext& __ctx, bool __mod = false) const
{
// %x Locale's date rep
// %Ex Locale's alternative date representation.
locale __loc = _M_locale(__ctx);
const auto& __tp = use_facet<__timepunct<_CharT>>(__loc);
const _CharT* __date_reps[2];
__tp._M_date_formats(__date_reps);
const _CharT* __rep = __date_reps[__mod];
if (!*__rep)
return _M_D(__t, std::move(__out), __ctx);
basic_string<_CharT> __fmt(_S_empty_spec);
__fmt.insert(1u, 1u, _S_colon);
__fmt.insert(2u, __rep);
return std::vformat_to(std::move(__out), __fmt,
std::make_format_args<_FormatContext>(__t));
}
template<typename _Tp, typename _FormatContext>
typename _FormatContext::iterator
_M_X(const _Tp& __tt, typename _FormatContext::iterator __out,
_FormatContext& __ctx, bool __mod = false) const
{
// %X Locale's time rep
// %EX Locale's alternative time representation.
auto __t = _S_floor_seconds(__tt);
locale __loc = _M_locale(__ctx);
const auto& __tp = use_facet<__timepunct<_CharT>>(__loc);
const _CharT* __time_reps[2];
__tp._M_time_formats(__time_reps);
const _CharT* __rep = __time_reps[__mod];
if (!*__rep)
return _M_R_T(__t, std::move(__out), __ctx, true);
basic_string<_CharT> __fmt(_S_empty_spec);
__fmt.insert(1u, 1u, _S_colon);
__fmt.insert(2u, __rep);
return std::vformat_to(std::move(__out), __fmt,
std::make_format_args<_FormatContext>(__t));
}
template<typename _Tp, typename _FormatContext>
typename _FormatContext::iterator
_M_z(const _Tp& __t, typename _FormatContext::iterator __out,
_FormatContext&, bool __mod = false) const
{
using ::std::chrono::__detail::__utc_leap_second;
using ::std::chrono::__detail::__local_time_fmt;
auto __utc = __mod ? __string_view(_GLIBCXX_WIDEN("+00:00"), 6)
: __string_view(_GLIBCXX_WIDEN("+0000"), 5);
if constexpr (chrono::__is_time_point_v<_Tp>)
{
if constexpr (is_same_v<typename _Tp::clock,
chrono::system_clock>)
return __format::__write(std::move(__out), __utc);
}
else if constexpr (__is_specialization_of<_Tp, __local_time_fmt>)
{
if (__t._M_offset_sec)
{
auto __sv = __utc;
basic_string<_CharT> __s;
if (*__t._M_offset_sec != 0s)
{
chrono:: hh_mm_ss __hms(*__t._M_offset_sec);
__s = _S_plus_minus[__hms.is_negative()];
__s += _S_two_digits(__hms.hours().count());
if (__mod)
__s += _S_colon;
__s += _S_two_digits(__hms.minutes().count());
__sv = __s;
}
return __format::__write(std::move(__out), __sv);
}
}
else if constexpr (__is_specialization_of<_Tp, __utc_leap_second>)
return __format::__write(std::move(__out), __utc);
__no_timezone_available();
}
template<typename _Tp, typename _FormatContext>
typename _FormatContext::iterator
_M_Z(const _Tp& __t, typename _FormatContext::iterator __out,
_FormatContext& __ctx) const
{
using ::std::chrono::__detail::__utc_leap_second;
using ::std::chrono::__detail::__local_time_fmt;
__string_view __utc(_GLIBCXX_WIDEN("UTC"), 3);
if constexpr (chrono::__is_time_point_v<_Tp>)
{
if constexpr (is_same_v<typename _Tp::clock,
chrono::system_clock>)
return __format::__write(std::move(__out), __utc);
}
else if constexpr (__is_specialization_of<_Tp, __local_time_fmt>)
{
if (__t._M_abbrev)
{
string_view __sv = *__t._M_abbrev;
if constexpr (is_same_v<_CharT, char>)
return __format::__write(std::move(__out), __sv);
else
{
// TODO use resize_and_overwrite
basic_string<_CharT> __ws(__sv.size(), _CharT());
auto& __ct = use_facet<ctype<_CharT>>(_M_locale(__ctx));
__ct.widen(__sv.begin(), __sv.end(), __ws.data());
__string_view __wsv = __ws;
return __format::__write(std::move(__out), __wsv);
}
}
}
else if constexpr (__is_specialization_of<_Tp, __utc_leap_second>)
return __format::__write(std::move(__out), __utc);
__no_timezone_available();
}
// %% handled in _M_format
// A single digit character in the range '0'..'9'.
static _CharT
_S_digit(int __n) noexcept
{
// Extra 9s avoid past-the-end read on bad input.
return _GLIBCXX_WIDEN("0123456789999999")[__n & 0xf];
}
// A string view of two digit characters, "00".."99".
static basic_string_view<_CharT>
_S_two_digits(int __n) noexcept
{
return {
_GLIBCXX_WIDEN("0001020304050607080910111213141516171819"
"2021222324252627282930313233343536373839"
"4041424344454647484950515253545556575859"
"6061626364656667686970717273747576777879"
"8081828384858687888990919293949596979899"
"9999999999999999999999999999999999999999"
"9999999999999999") + 2 * (__n & 0x7f),
2
};
}
// Accessors for the components of chrono types:
// Returns a hh_mm_ss.
template<typename _Tp>
static decltype(auto)
_S_hms(const _Tp& __t)
{
using ::std::chrono::__detail::__utc_leap_second;
using ::std::chrono::__detail::__local_time_fmt;
if constexpr (__is_specialization_of<_Tp, chrono::hh_mm_ss>)
return __t;
else if constexpr (__is_specialization_of<_Tp, __utc_leap_second>)
return __t._M_time;
else if constexpr (chrono::__is_duration_v<_Tp>)
return chrono::hh_mm_ss<_Tp>(__t);
else if constexpr (chrono::__is_time_point_v<_Tp>)
return chrono::hh_mm_ss(__t - chrono::floor<chrono::days>(__t));
else if constexpr (__is_specialization_of<_Tp, __local_time_fmt>)
return _S_hms(__t._M_time);
else
{
__invalid_chrono_spec();
return chrono::hh_mm_ss<chrono::seconds>();
}
}
// Returns a sys_days or local_days.
template<typename _Tp>
static auto
_S_days(const _Tp& __t)
{
using namespace chrono;
using ::std::chrono::__detail::__utc_leap_second;
using ::std::chrono::__detail::__local_time_fmt;
if constexpr (__is_time_point_v<_Tp>)
return chrono::floor<days>(__t);
else if constexpr (__is_specialization_of<_Tp, __utc_leap_second>)
return __t._M_date;
else if constexpr (__is_specialization_of<_Tp, __local_time_fmt>)
return chrono::floor<days>(__t._M_time);
else if constexpr (is_same_v<_Tp, year_month_day>
|| is_same_v<_Tp, year_month_day_last>
|| is_same_v<_Tp, year_month_weekday>
|| is_same_v<_Tp, year_month_weekday_last>)
return sys_days(__t);
else
{
if constexpr (__is_duration_v<_Tp>)
__not_valid_for_duration();
else
__invalid_chrono_spec();
return chrono::sys_days();
}
}
// Returns a year_month_day.
template<typename _Tp>
static chrono::year_month_day
_S_date(const _Tp& __t)
{
if constexpr (is_same_v<_Tp, chrono::year_month_day>)
return __t;
else
return chrono::year_month_day(_S_days(__t));
}
template<typename _Tp>
static chrono::day
_S_day(const _Tp& __t)
{
using namespace chrono;
if constexpr (is_same_v<_Tp, day>)
return __t;
else if constexpr (requires { __t.day(); })
return __t.day();
else
return _S_date(__t).day();
}
template<typename _Tp>
static chrono::month
_S_month(const _Tp& __t)
{
using namespace chrono;
if constexpr (is_same_v<_Tp, month>)
return __t;
else if constexpr (requires { __t.month(); })
return __t.month();
else
return _S_date(__t).month();
}
template<typename _Tp>
static chrono::year
_S_year(const _Tp& __t)
{
using namespace chrono;
if constexpr (is_same_v<_Tp, year>)
return __t;
else if constexpr (requires { __t.year(); })
return __t.year();
else
return _S_date(__t).year();
}
template<typename _Tp>
static chrono::weekday
_S_weekday(const _Tp& __t)
{
using namespace ::std::chrono;
using ::std::chrono::__detail::__local_time_fmt;
if constexpr (is_same_v<_Tp, weekday>)
return __t;
else if constexpr (requires { __t.weekday(); })
return __t.weekday();
else if constexpr (is_same_v<_Tp, month_weekday>)
return __t.weekday_indexed().weekday();
else if constexpr (is_same_v<_Tp, month_weekday_last>)
return __t.weekday_last().weekday();
else
return weekday(_S_days(__t));
}
// Remove subsecond precision from a time_point.
template<typename _Tp>
static auto
_S_floor_seconds(const _Tp& __t)
{
using chrono::__detail::__local_time_fmt;
if constexpr (chrono::__is_time_point_v<_Tp>
|| chrono::__is_duration_v<_Tp>)
{
if constexpr (_Tp::period::den != 1)
return chrono::floor<chrono::seconds>(__t);
else
return __t;
}
else if constexpr (__is_specialization_of<_Tp, chrono::hh_mm_ss>)
{
if constexpr (_Tp::fractional_width != 0)
return chrono::floor<chrono::seconds>(__t.to_duration());
else
return __t;
}
else if constexpr (__is_specialization_of<_Tp, __local_time_fmt>)
return _S_floor_seconds(__t._M_time);
else
return __t;
}
// Use the formatting locale's std::time_put facet to produce
// a locale-specific representation.
template<typename _Iter>
_Iter
_M_locale_fmt(_Iter __out, const locale& __loc, const struct tm& __tm,
char __fmt, char __mod) const
{
basic_ostringstream<_CharT> __os;
const auto& __tp = use_facet<time_put<_CharT>>(__loc);
__tp.put(__os, __os, _S_space, &__tm, __fmt, __mod);
if (__os)
__out = __format::__write(std::move(__out), __os.view());
return __out;
}
};
} // namespace __format
/// @endcond
template<typename _Rep, typename _Period, typename _CharT>
struct formatter<chrono::duration<_Rep, _Period>, _CharT>
{
constexpr typename basic_format_parse_context<_CharT>::iterator
parse(basic_format_parse_context<_CharT>& __pc)
{
using namespace __format;
auto __it = _M_f._M_parse(__pc, _Duration|_TimeOfDay);
if constexpr (!is_floating_point_v<_Rep>)
if (_M_f._M_spec._M_prec_kind != __format::_WP_none)
__throw_format_error("format error: invalid precision for duration");
return __it;
}
template<typename _Out>
typename basic_format_context<_Out, _CharT>::iterator
format(const chrono::duration<_Rep, _Period>& __d,
basic_format_context<_Out, _CharT>& __fc) const
{
if constexpr (numeric_limits<_Rep>::is_signed)
if (__d < __d.zero())
return _M_f._M_format(-__d, __fc, true);
return _M_f._M_format(__d, __fc, false);
}
private:
__format::__formatter_chrono<_CharT> _M_f;
};
template<typename _CharT>
struct formatter<chrono::day, _CharT>
{
template<typename _ParseContext>
constexpr typename _ParseContext::iterator
parse(_ParseContext& __pc)
{ return _M_f._M_parse(__pc, __format::_Day); }
template<typename _FormatContext>
typename _FormatContext::iterator
format(const chrono::day& __t, _FormatContext& __fc) const
{ return _M_f._M_format(__t, __fc); }
private:
__format::__formatter_chrono<_CharT> _M_f;
};
template<typename _CharT>
struct formatter<chrono::month, _CharT>
{
template<typename _ParseContext>
constexpr typename _ParseContext::iterator
parse(_ParseContext& __pc)
{ return _M_f._M_parse(__pc, __format::_Month); }
template<typename _FormatContext>
typename _FormatContext::iterator
format(const chrono::month& __t, _FormatContext& __fc) const
{ return _M_f._M_format(__t, __fc); }
private:
__format::__formatter_chrono<_CharT> _M_f;
};
template<typename _CharT>
struct formatter<chrono::year, _CharT>
{
template<typename _ParseContext>
constexpr typename _ParseContext::iterator
parse(_ParseContext& __pc)
{ return _M_f._M_parse(__pc, __format::_Year); }
template<typename _FormatContext>
typename _FormatContext::iterator
format(const chrono::year& __t, _FormatContext& __fc) const
{ return _M_f._M_format(__t, __fc); }
private:
__format::__formatter_chrono<_CharT> _M_f;
};
template<typename _CharT>
struct formatter<chrono::weekday, _CharT>
{
template<typename _ParseContext>
constexpr typename _ParseContext::iterator
parse(_ParseContext& __pc)
{ return _M_f._M_parse(__pc, __format::_Weekday); }
template<typename _FormatContext>
typename _FormatContext::iterator
format(const chrono::weekday& __t, _FormatContext& __fc) const
{ return _M_f._M_format(__t, __fc); }
private:
__format::__formatter_chrono<_CharT> _M_f;
};
template<typename _CharT>
struct formatter<chrono::weekday_indexed, _CharT>
{
template<typename _ParseContext>
constexpr typename _ParseContext::iterator
parse(_ParseContext& __pc)
{ return _M_f._M_parse(__pc, __format::_Weekday); }
template<typename _FormatContext>
typename _FormatContext::iterator
format(const chrono::weekday_indexed& __t, _FormatContext& __fc) const
{ return _M_f._M_format(__t, __fc); }
private:
__format::__formatter_chrono<_CharT> _M_f;
};
template<typename _CharT>
struct formatter<chrono::weekday_last, _CharT>
{
template<typename _ParseContext>
constexpr typename _ParseContext::iterator
parse(_ParseContext& __pc)
{ return _M_f._M_parse(__pc, __format::_Weekday); }
template<typename _FormatContext>
typename _FormatContext::iterator
format(const chrono::weekday_last& __t, _FormatContext& __fc) const
{ return _M_f._M_format(__t, __fc); }
private:
__format::__formatter_chrono<_CharT> _M_f;
};
template<typename _CharT>
struct formatter<chrono::month_day, _CharT>
{
template<typename _ParseContext>
constexpr typename _ParseContext::iterator
parse(_ParseContext& __pc)
{ return _M_f._M_parse(__pc, __format::_Month|__format::_Day); }
template<typename _FormatContext>
typename _FormatContext::iterator
format(const chrono::month_day& __t, _FormatContext& __fc) const
{ return _M_f._M_format(__t, __fc); }
private:
__format::__formatter_chrono<_CharT> _M_f;
};
template<typename _CharT>
struct formatter<chrono::month_day_last, _CharT>
{
template<typename _ParseContext>
constexpr typename _ParseContext::iterator
parse(_ParseContext& __pc)
{ return _M_f._M_parse(__pc, __format::_Month|__format::_Day); }
template<typename _FormatContext>
typename _FormatContext::iterator
format(const chrono::month_day_last& __t, _FormatContext& __fc) const
{ return _M_f._M_format(__t, __fc); }
private:
__format::__formatter_chrono<_CharT> _M_f;
};
template<typename _CharT>
struct formatter<chrono::month_weekday, _CharT>
{
template<typename _ParseContext>
constexpr typename _ParseContext::iterator
parse(_ParseContext& __pc)
{ return _M_f._M_parse(__pc, __format::_Month|__format::_Weekday); }
template<typename _FormatContext>
typename _FormatContext::iterator
format(const chrono::month_weekday& __t, _FormatContext& __fc) const
{ return _M_f._M_format(__t, __fc); }
private:
__format::__formatter_chrono<_CharT> _M_f;
};
template<typename _CharT>
struct formatter<chrono::month_weekday_last, _CharT>
{
template<typename _ParseContext>
constexpr typename _ParseContext::iterator
parse(_ParseContext& __pc)
{ return _M_f._M_parse(__pc, __format::_Month|__format::_Weekday); }
template<typename _FormatContext>
typename _FormatContext::iterator
format(const chrono::month_weekday_last& __t,
_FormatContext& __fc) const
{ return _M_f._M_format(__t, __fc); }
private:
__format::__formatter_chrono<_CharT> _M_f;
};
template<typename _CharT>
struct formatter<chrono::year_month, _CharT>
{
template<typename _ParseContext>
constexpr typename _ParseContext::iterator
parse(_ParseContext& __pc)
{ return _M_f._M_parse(__pc, __format::_Year|__format::_Month); }
template<typename _FormatContext>
typename _FormatContext::iterator
format(const chrono::year_month& __t, _FormatContext& __fc) const
{ return _M_f._M_format(__t, __fc); }
private:
__format::__formatter_chrono<_CharT> _M_f;
};
template<typename _CharT>
struct formatter<chrono::year_month_day, _CharT>
{
template<typename _ParseContext>
constexpr typename _ParseContext::iterator
parse(_ParseContext& __pc)
{ return _M_f._M_parse(__pc, __format::_Date); }
template<typename _FormatContext>
typename _FormatContext::iterator
format(const chrono::year_month_day& __t, _FormatContext& __fc) const
{ return _M_f._M_format(__t, __fc); }
private:
__format::__formatter_chrono<_CharT> _M_f;
};
template<typename _CharT>
struct formatter<chrono::year_month_day_last, _CharT>
{
template<typename _ParseContext>
constexpr typename _ParseContext::iterator
parse(_ParseContext& __pc)
{ return _M_f._M_parse(__pc, __format::_Date); }
template<typename _FormatContext>
typename _FormatContext::iterator
format(const chrono::year_month_day_last& __t,
_FormatContext& __fc) const
{ return _M_f._M_format(__t, __fc); }
private:
__format::__formatter_chrono<_CharT> _M_f;
};
template<typename _CharT>
struct formatter<chrono::year_month_weekday, _CharT>
{
template<typename _ParseContext>
constexpr typename _ParseContext::iterator
parse(_ParseContext& __pc)
{ return _M_f._M_parse(__pc, __format::_Date); }
template<typename _FormatContext>
typename _FormatContext::iterator
format(const chrono::year_month_weekday& __t,
_FormatContext& __fc) const
{ return _M_f._M_format(__t, __fc); }
private:
__format::__formatter_chrono<_CharT> _M_f;
};
template<typename _CharT>
struct formatter<chrono::year_month_weekday_last, _CharT>
{
template<typename _ParseContext>
constexpr typename _ParseContext::iterator
parse(_ParseContext& __pc)
{ return _M_f._M_parse(__pc, __format::_Date); }
template<typename _FormatContext>
typename _FormatContext::iterator
format(const chrono::year_month_weekday_last& __t,
_FormatContext& __fc) const
{ return _M_f._M_format(__t, __fc); }
private:
__format::__formatter_chrono<_CharT> _M_f;
};
template<typename _Rep, typename _Period, typename _CharT>
struct formatter<chrono::hh_mm_ss<chrono::duration<_Rep, _Period>>, _CharT>
{
template<typename _ParseContext>
constexpr typename _ParseContext::iterator
parse(_ParseContext& __pc)
{ return _M_f._M_parse(__pc, __format::_TimeOfDay); }
template<typename _FormatContext>
typename _FormatContext::iterator
format(const chrono::hh_mm_ss<chrono::duration<_Rep, _Period>>& __t,
_FormatContext& __fc) const
{ return _M_f._M_format(__t, __fc); }
private:
__format::__formatter_chrono<_CharT> _M_f;
};
#if _GLIBCXX_USE_CXX11_ABI || ! _GLIBCXX_USE_DUAL_ABI
template<typename _CharT>
struct formatter<chrono::sys_info, _CharT>
{
template<typename _ParseContext>
constexpr typename _ParseContext::iterator
parse(_ParseContext& __pc)
{ return _M_f._M_parse(__pc, __format::_ChronoParts{}); }
template<typename _FormatContext>
typename _FormatContext::iterator
format(const chrono::sys_info& __i, _FormatContext& __fc) const
{ return _M_f._M_format(__i, __fc); }
private:
__format::__formatter_chrono<_CharT> _M_f;
};
template<typename _CharT>
struct formatter<chrono::local_info, _CharT>
{
template<typename _ParseContext>
constexpr typename _ParseContext::iterator
parse(_ParseContext& __pc)
{ return _M_f._M_parse(__pc, __format::_ChronoParts{}); }
template<typename _FormatContext>
typename _FormatContext::iterator
format(const chrono::local_info& __i, _FormatContext& __fc) const
{ return _M_f._M_format(__i, __fc); }
private:
__format::__formatter_chrono<_CharT> _M_f;
};
#endif
template<typename _Duration, typename _CharT>
struct formatter<chrono::sys_time<_Duration>, _CharT>
{
template<typename _ParseContext>
constexpr typename _ParseContext::iterator
parse(_ParseContext& __pc)
{
auto __next = _M_f._M_parse(__pc, __format::_ZonedDateTime);
if constexpr (!__stream_insertable)
if (_M_f._M_spec._M_chrono_specs.empty())
__format::__invalid_chrono_spec(); // chrono-specs can't be empty
return __next;
}
template<typename _FormatContext>
typename _FormatContext::iterator
format(const chrono::sys_time<_Duration>& __t,
_FormatContext& __fc) const
{ return _M_f._M_format(__t, __fc); }
private:
static constexpr bool __stream_insertable
= requires (basic_ostream<_CharT>& __os,
chrono::sys_time<_Duration> __t) { __os << __t; };
__format::__formatter_chrono<_CharT> _M_f;
};
template<typename _Duration, typename _CharT>
struct formatter<chrono::utc_time<_Duration>, _CharT>
: __format::__formatter_chrono<_CharT>
{
template<typename _ParseContext>
constexpr typename _ParseContext::iterator
parse(_ParseContext& __pc)
{ return _M_f._M_parse(__pc, __format::_ZonedDateTime); }
template<typename _FormatContext>
typename _FormatContext::iterator
format(const chrono::utc_time<_Duration>& __t,
_FormatContext& __fc) const
{
// Adjust by removing leap seconds to get equivalent sys_time.
// We can't just use clock_cast because we want to know if the time
// falls within a leap second insertion, and format seconds as "60".
using chrono::__detail::__utc_leap_second;
using chrono::seconds;
using chrono::sys_time;
using _CDur = common_type_t<_Duration, seconds>;
const auto __li = chrono::get_leap_second_info(__t);
sys_time<_CDur> __s{__t.time_since_epoch() - __li.elapsed};
if (!__li.is_leap_second) [[likely]]
return _M_f._M_format(__s, __fc);
else
return _M_f._M_format(__utc_leap_second(__s), __fc);
}
private:
friend formatter<chrono::__detail::__utc_leap_second<_Duration>, _CharT>;
__format::__formatter_chrono<_CharT> _M_f;
};
template<typename _Duration, typename _CharT>
struct formatter<chrono::tai_time<_Duration>, _CharT>
: __format::__formatter_chrono<_CharT>
{
template<typename _ParseContext>
constexpr typename _ParseContext::iterator
parse(_ParseContext& __pc)
{ return _M_f._M_parse(__pc, __format::_ZonedDateTime); }
template<typename _FormatContext>
typename _FormatContext::iterator
format(const chrono::tai_time<_Duration>& __t,
_FormatContext& __fc) const
{
// Convert to __local_time_fmt with abbrev "TAI" and offset 0s.
// Offset is 1970y/January/1 - 1958y/January/1
constexpr chrono::days __tai_offset = chrono::days(4383);
using _CDur = common_type_t<_Duration, chrono::days>;
chrono::local_time<_CDur> __lt(__t.time_since_epoch() - __tai_offset);
const string __abbrev("TAI", 3);
const chrono::seconds __off = 0s;
const auto __lf = chrono::local_time_format(__lt, &__abbrev, &__off);
return _M_f._M_format(__lf, __fc);
}
private:
__format::__formatter_chrono<_CharT> _M_f;
};
template<typename _Duration, typename _CharT>
struct formatter<chrono::gps_time<_Duration>, _CharT>
: __format::__formatter_chrono<_CharT>
{
template<typename _ParseContext>
constexpr typename _ParseContext::iterator
parse(_ParseContext& __pc)
{ return _M_f._M_parse(__pc, __format::_ZonedDateTime); }
template<typename _FormatContext>
typename _FormatContext::iterator
format(const chrono::gps_time<_Duration>& __t,
_FormatContext& __fc) const
{
// Convert to __local_time_fmt with abbrev "GPS" and offset 0s.
// Offset is 1980y/January/Sunday[1] - 1970y/January/1
constexpr chrono::days __gps_offset = chrono::days(3657);
using _CDur = common_type_t<_Duration, chrono::days>;
chrono::local_time<_CDur> __lt(__t.time_since_epoch() + __gps_offset);
const string __abbrev("GPS", 3);
const chrono::seconds __off = 0s;
const auto __lf = chrono::local_time_format(__lt, &__abbrev, &__off);
return _M_f._M_format(__lf, __fc);
}
private:
__format::__formatter_chrono<_CharT> _M_f;
};
template<typename _Duration, typename _CharT>
struct formatter<chrono::file_time<_Duration>, _CharT>
{
template<typename _ParseContext>
constexpr typename _ParseContext::iterator
parse(_ParseContext& __pc)
{ return _M_f._M_parse(__pc, __format::_ZonedDateTime); }
template<typename _FormatContext>
typename _FormatContext::iterator
format(const chrono::file_time<_Duration>& __t,
_FormatContext& __ctx) const
{
using namespace chrono;
return _M_f._M_format(chrono::clock_cast<system_clock>(__t), __ctx);
}
private:
__format::__formatter_chrono<_CharT> _M_f;
};
template<typename _Duration, typename _CharT>
struct formatter<chrono::local_time<_Duration>, _CharT>
{
template<typename _ParseContext>
constexpr typename _ParseContext::iterator
parse(_ParseContext& __pc)
{ return _M_f._M_parse(__pc, __format::_DateTime); }
template<typename _FormatContext>
typename _FormatContext::iterator
format(const chrono::local_time<_Duration>& __t,
_FormatContext& __ctx) const
{ return _M_f._M_format(__t, __ctx); }
private:
__format::__formatter_chrono<_CharT> _M_f;
};
template<typename _Duration, typename _CharT>
struct formatter<chrono::__detail::__local_time_fmt<_Duration>, _CharT>
{
template<typename _ParseContext>
constexpr typename _ParseContext::iterator
parse(_ParseContext& __pc)
{ return _M_f._M_parse(__pc, __format::_ZonedDateTime); }
template<typename _FormatContext>
typename _FormatContext::iterator
format(const chrono::__detail::__local_time_fmt<_Duration>& __t,
_FormatContext& __ctx) const
{ return _M_f._M_format(__t, __ctx); }
private:
__format::__formatter_chrono<_CharT> _M_f;
};
#if _GLIBCXX_USE_CXX11_ABI || ! _GLIBCXX_USE_DUAL_ABI
template<typename _Duration, typename _TimeZonePtr, typename _CharT>
struct formatter<chrono::zoned_time<_Duration, _TimeZonePtr>, _CharT>
: formatter<chrono::__detail::__local_time_fmt<_Duration>, _CharT>
{
template<typename _FormatContext>
typename _FormatContext::iterator
format(const chrono::zoned_time<_Duration, _TimeZonePtr>& __tp,
_FormatContext& __ctx) const
{
using chrono::__detail::__local_time_fmt;
using _Base = formatter<__local_time_fmt<_Duration>, _CharT>;
const chrono::sys_info __info = __tp.get_info();
const auto __lf = chrono::local_time_format(__tp.get_local_time(),
&__info.abbrev,
&__info.offset);
return _Base::format(__lf, __ctx);
}
};
#endif
// Partial specialization needed for %c formatting of __utc_leap_second.
template<typename _Duration, typename _CharT>
struct formatter<chrono::__detail::__utc_leap_second<_Duration>, _CharT>
: formatter<chrono::utc_time<_Duration>, _CharT>
{
template<typename _FormatContext>
typename _FormatContext::iterator
format(const chrono::__detail::__utc_leap_second<_Duration>& __t,
_FormatContext& __fc) const
{ return this->_M_f._M_format(__t, __fc); }
};
namespace chrono
{
/// @addtogroup chrono
/// @{
/// @cond undocumented
namespace __detail
{
template<typename _Duration = seconds>
struct _Parser
{
static_assert(is_same_v<common_type_t<_Duration, seconds>, _Duration>);
explicit
_Parser(__format::_ChronoParts __need) : _M_need(__need) { }
_Parser(_Parser&&) = delete;
void operator=(_Parser&&) = delete;
_Duration _M_time{}; // since midnight
sys_days _M_sys_days{};
year_month_day _M_ymd{};
weekday _M_wd{};
__format::_ChronoParts _M_need;
unsigned _M_is_leap_second : 1 {};
unsigned _M_reserved : 15 {};
template<typename _CharT, typename _Traits, typename _Alloc>
basic_istream<_CharT, _Traits>&
operator()(basic_istream<_CharT, _Traits>& __is, const _CharT* __fmt,
basic_string<_CharT, _Traits, _Alloc>* __abbrev = nullptr,
minutes* __offset = nullptr);
private:
// Read an unsigned integer from the stream and return it.
// Extract no more than __n digits. Set failbit if an integer isn't read.
template<typename _CharT, typename _Traits>
static int_least32_t
_S_read_unsigned(basic_istream<_CharT, _Traits>& __is,
ios_base::iostate& __err, int __n)
{
int_least32_t __val = _S_try_read_digit(__is, __err);
if (__val == -1) [[unlikely]]
__err |= ios_base::failbit;
else
{
int __n1 = (std::min)(__n, 9);
// Cannot overflow __val unless we read more than 9 digits
for (int __i = 1; __i < __n1; ++__i)
if (auto __dig = _S_try_read_digit(__is, __err); __dig != -1)
{
__val *= 10;
__val += __dig;
}
while (__n1++ < __n) [[unlikely]]
if (auto __dig = _S_try_read_digit(__is, __err); __dig != -1)
{
if (__builtin_mul_overflow(__val, 10, &__val)
|| __builtin_add_overflow(__val, __dig, &__val))
{
__err |= ios_base::failbit;
return -1;
}
}
}
return __val;
}
// Read an unsigned integer from the stream and return it.
// Extract no more than __n digits. Set failbit if an integer isn't read.
template<typename _CharT, typename _Traits>
static int_least32_t
_S_read_signed(basic_istream<_CharT, _Traits>& __is,
ios_base::iostate& __err, int __n)
{
auto __sign = __is.peek();
if (__sign == '-' || __sign == '+')
(void) __is.get();
int_least32_t __val = _S_read_unsigned(__is, __err, __n);
if (__err & ios_base::failbit)
{
if (__sign == '-') [[unlikely]]
__val *= -1;
}
return __val;
}
// Read a digit from the stream and return it, or return -1.
// If no digit is read eofbit will be set (but not failbit).
template<typename _CharT, typename _Traits>
static int_least32_t
_S_try_read_digit(basic_istream<_CharT, _Traits>& __is,
ios_base::iostate& __err)
{
int_least32_t __val = -1;
auto __i = __is.peek();
if (!_Traits::eq_int_type(__i, _Traits::eof())) [[likely]]
{
_CharT __c = _Traits::to_char_type(__i);
if (_CharT('0') <= __c && __c <= _CharT('9')) [[likely]]
{
(void) __is.get();
__val = __c - _CharT('0');
}
}
else
__err |= ios_base::eofbit;
return __val;
}
// Read the specified character and return true.
// If the character is not found, set failbit and return false.
template<typename _CharT, typename _Traits>
static bool
_S_read_chr(basic_istream<_CharT, _Traits>& __is,
ios_base::iostate& __err, _CharT __c)
{
auto __i = __is.peek();
if (_Traits::eq_int_type(__i, _Traits::eof()))
__err |= ios_base::eofbit;
else if (_Traits::to_char_type(__i) == __c) [[likely]]
{
(void) __is.get();
return true;
}
__err |= ios_base::failbit;
return false;
}
};
template<typename _Duration>
using _Parser_t = _Parser<common_type_t<_Duration, seconds>>;
} // namespace __detail
/// @endcond
template<typename _CharT, typename _Traits, typename _Rep, typename _Period,
typename _Alloc = allocator<_CharT>>
inline basic_istream<_CharT, _Traits>&
from_stream(basic_istream<_CharT, _Traits>& __is, const _CharT* __fmt,
duration<_Rep, _Period>& __d,
basic_string<_CharT, _Traits, _Alloc>* __abbrev = nullptr,
minutes* __offset = nullptr)
{
auto __need = __format::_ChronoParts::_TimeOfDay;
__detail::_Parser_t<duration<_Rep, _Period>> __p(__need);
if (__p(__is, __fmt, __abbrev, __offset))
__d = chrono::duration_cast<duration<_Rep, _Period>>(__p._M_time);
return __is;
}
template<typename _CharT, typename _Traits>
inline basic_ostream<_CharT, _Traits>&
operator<<(basic_ostream<_CharT, _Traits>& __os, const day& __d)
{
using _Ctx = __format::__format_context<_CharT>;
using _Str = basic_string_view<_CharT>;
_Str __s = _GLIBCXX_WIDEN("{:02d} is not a valid day");
if (__d.ok())
__s = __s.substr(0, 6);
auto __u = (unsigned)__d;
__os << std::vformat(__s, make_format_args<_Ctx>(__u));
return __os;
}
template<typename _CharT, typename _Traits,
typename _Alloc = allocator<_CharT>>
inline basic_istream<_CharT, _Traits>&
from_stream(basic_istream<_CharT, _Traits>& __is, const _CharT* __fmt,
day& __d,
basic_string<_CharT, _Traits, _Alloc>* __abbrev = nullptr,
minutes* __offset = nullptr)
{
__detail::_Parser<> __p(__format::_ChronoParts::_Day);
if (__p(__is, __fmt, __abbrev, __offset))
__d = __p._M_ymd.day();
return __is;
}
template<typename _CharT, typename _Traits>
inline basic_ostream<_CharT, _Traits>&
operator<<(basic_ostream<_CharT, _Traits>& __os, const month& __m)
{
using _Ctx = __format::__format_context<_CharT>;
using _Str = basic_string_view<_CharT>;
_Str __s = _GLIBCXX_WIDEN("{:L%b}{} is not a valid month");
if (__m.ok())
__os << std::vformat(__os.getloc(), __s.substr(0, 6),
make_format_args<_Ctx>(__m));
else
{
auto __u = (unsigned)__m;
__os << std::vformat(__s.substr(6), make_format_args<_Ctx>(__u));
}
return __os;
}
template<typename _CharT, typename _Traits,
typename _Alloc = allocator<_CharT>>
inline basic_istream<_CharT, _Traits>&
from_stream(basic_istream<_CharT, _Traits>& __is, const _CharT* __fmt,
month& __m,
basic_string<_CharT, _Traits, _Alloc>* __abbrev = nullptr,
minutes* __offset = nullptr)
{
__detail::_Parser<> __p(__format::_ChronoParts::_Month);
if (__p(__is, __fmt, __abbrev, __offset))
__m = __p._M_ymd.month();
return __is;
}
template<typename _CharT, typename _Traits>
inline basic_ostream<_CharT, _Traits>&
operator<<(basic_ostream<_CharT, _Traits>& __os, const year& __y)
{
using _Ctx = __format::__format_context<_CharT>;
using _Str = basic_string_view<_CharT>;
_Str __s = _GLIBCXX_WIDEN("-{:04d} is not a valid year");
if (__y.ok())
__s = __s.substr(0, 7);
int __i = (int)__y;
if (__i >= 0) [[likely]]
__s.remove_prefix(1);
else
__i = -__i;
__os << std::vformat(__s, make_format_args<_Ctx>(__i));
return __os;
}
template<typename _CharT, typename _Traits,
typename _Alloc = allocator<_CharT>>
inline basic_istream<_CharT, _Traits>&
from_stream(basic_istream<_CharT, _Traits>& __is, const _CharT* __fmt,
year& __y,
basic_string<_CharT, _Traits, _Alloc>* __abbrev = nullptr,
minutes* __offset = nullptr)
{
__detail::_Parser<> __p(__format::_ChronoParts::_Year);
if (__p(__is, __fmt, __abbrev, __offset))
__y = __p._M_ymd.year();
return __is;
}
template<typename _CharT, typename _Traits>
inline basic_ostream<_CharT, _Traits>&
operator<<(basic_ostream<_CharT, _Traits>& __os, const weekday& __wd)
{
using _Ctx = __format::__format_context<_CharT>;
using _Str = basic_string_view<_CharT>;
_Str __s = _GLIBCXX_WIDEN("{:L%a}{} is not a valid weekday");
if (__wd.ok())
__os << std::vformat(__os.getloc(), __s.substr(0, 6),
make_format_args<_Ctx>(__wd));
else
{
auto __c = __wd.c_encoding();
__os << std::vformat(__s.substr(6), make_format_args<_Ctx>(__c));
}
return __os;
}
template<typename _CharT, typename _Traits,
typename _Alloc = allocator<_CharT>>
inline basic_istream<_CharT, _Traits>&
from_stream(basic_istream<_CharT, _Traits>& __is, const _CharT* __fmt,
weekday& __wd,
basic_string<_CharT, _Traits, _Alloc>* __abbrev = nullptr,
minutes* __offset = nullptr)
{
__detail::_Parser<> __p(__format::_ChronoParts::_Weekday);
if (__p(__is, __fmt, __abbrev, __offset))
__wd = __p._M_wd;
return __is;
}
template<typename _CharT, typename _Traits>
inline basic_ostream<_CharT, _Traits>&
operator<<(basic_ostream<_CharT, _Traits>& __os,
const weekday_indexed& __wdi)
{
// The standard says to format wdi.weekday() and wdi.index() using
// either "{:L}[{}]" or "{:L}[{} is not a valid index]". The {:L} spec
// means to format the weekday using ostringstream, so just do that.
basic_stringstream<_CharT> __os2;
__os2.imbue(__os.getloc());
__os2 << __wdi.weekday();
const auto __i = __wdi.index();
basic_string_view<_CharT> __s
= _GLIBCXX_WIDEN("[ is not a valid index]");
__os2 << __s[0];
__os2 << std::format(_GLIBCXX_WIDEN("{}"), __i);
if (__i >= 1 && __i <= 5)
__os2 << __s.back();
else
__os2 << __s.substr(1);
__os << __os2.view();
return __os;
}
template<typename _CharT, typename _Traits>
inline basic_ostream<_CharT, _Traits>&
operator<<(basic_ostream<_CharT, _Traits>& __os,
const weekday_last& __wdl)
{
// As above, just write straight to a stringstream, as if by "{:L}[last]"
basic_stringstream<_CharT> __os2;
__os2.imbue(__os.getloc());
__os2 << __wdl.weekday() << _GLIBCXX_WIDEN("[last]");
__os << __os2.view();
return __os;
}
template<typename _CharT, typename _Traits>
inline basic_ostream<_CharT, _Traits>&
operator<<(basic_ostream<_CharT, _Traits>& __os, const month_day& __md)
{
// As above, just write straight to a stringstream, as if by "{:L}/{}"
basic_stringstream<_CharT> __os2;
__os2.imbue(__os.getloc());
__os2 << __md.month();
if constexpr (is_same_v<_CharT, char>)
__os2 << '/';
else
__os2 << L'/';
__os2 << __md.day();
__os << __os2.view();
return __os;
}
template<typename _CharT, typename _Traits,
typename _Alloc = allocator<_CharT>>
inline basic_istream<_CharT, _Traits>&
from_stream(basic_istream<_CharT, _Traits>& __is, const _CharT* __fmt,
month_day& __md,
basic_string<_CharT, _Traits, _Alloc>* __abbrev = nullptr,
minutes* __offset = nullptr)
{
using __format::_ChronoParts;
auto __need = _ChronoParts::_Month | _ChronoParts::_Day;
__detail::_Parser<> __p(__need);
if (__p(__is, __fmt, __abbrev, __offset))
__md = month_day(__p._M_ymd.month(), __p._M_ymd.day());
return __is;
}
template<typename _CharT, typename _Traits>
inline basic_ostream<_CharT, _Traits>&
operator<<(basic_ostream<_CharT, _Traits>& __os,
const month_day_last& __mdl)
{
// As above, just write straight to a stringstream, as if by "{:L}/last"
basic_stringstream<_CharT> __os2;
__os2.imbue(__os.getloc());
__os2 << __mdl.month() << _GLIBCXX_WIDEN("/last");
__os << __os2.view();
return __os;
}
template<typename _CharT, typename _Traits>
inline basic_ostream<_CharT, _Traits>&
operator<<(basic_ostream<_CharT, _Traits>& __os,
const month_weekday& __mwd)
{
// As above, just write straight to a stringstream, as if by "{:L}/{:L}"
basic_stringstream<_CharT> __os2;
__os2.imbue(__os.getloc());
__os2 << __mwd.month();
if constexpr (is_same_v<_CharT, char>)
__os2 << '/';
else
__os2 << L'/';
__os2 << __mwd.weekday_indexed();
__os << __os2.view();
return __os;
}
template<typename _CharT, typename _Traits>
inline basic_ostream<_CharT, _Traits>&
operator<<(basic_ostream<_CharT, _Traits>& __os,
const month_weekday_last& __mwdl)
{
// As above, just write straight to a stringstream, as if by "{:L}/{:L}"
basic_stringstream<_CharT> __os2;
__os2.imbue(__os.getloc());
__os2 << __mwdl.month();
if constexpr (is_same_v<_CharT, char>)
__os2 << '/';
else
__os2 << L'/';
__os2 << __mwdl.weekday_last();
__os << __os2.view();
return __os;
}
template<typename _CharT, typename _Traits>
inline basic_ostream<_CharT, _Traits>&
operator<<(basic_ostream<_CharT, _Traits>& __os, const year_month& __ym)
{
// As above, just write straight to a stringstream, as if by "{}/{:L}"
basic_stringstream<_CharT> __os2;
__os2.imbue(__os.getloc());
__os2 << __ym.year();
if constexpr (is_same_v<_CharT, char>)
__os2 << '/';
else
__os2 << L'/';
__os2 << __ym.month();
__os << __os2.view();
return __os;
}
template<typename _CharT, typename _Traits,
typename _Alloc = allocator<_CharT>>
inline basic_istream<_CharT, _Traits>&
from_stream(basic_istream<_CharT, _Traits>& __is, const _CharT* __fmt,
year_month& __ym,
basic_string<_CharT, _Traits, _Alloc>* __abbrev = nullptr,
minutes* __offset = nullptr)
{
using __format::_ChronoParts;
auto __need = _ChronoParts::_Year | _ChronoParts::_Month;
__detail::_Parser<> __p(__need);
if (__p(__is, __fmt, __abbrev, __offset))
__ym = year_month(__p._M_ymd.year(), __p._M_ymd.month());
return __is;
}
template<typename _CharT, typename _Traits>
inline basic_ostream<_CharT, _Traits>&
operator<<(basic_ostream<_CharT, _Traits>& __os,
const year_month_day& __ymd)
{
using _Ctx = __format::__format_context<_CharT>;
using _Str = basic_string_view<_CharT>;
_Str __s = _GLIBCXX_WIDEN("{:%F} is not a valid date");
__os << std::vformat(__ymd.ok() ? __s.substr(0, 5) : __s,
make_format_args<_Ctx>(__ymd));
return __os;
}
template<typename _CharT, typename _Traits,
typename _Alloc = allocator<_CharT>>
inline basic_istream<_CharT, _Traits>&
from_stream(basic_istream<_CharT, _Traits>& __is, const _CharT* __fmt,
year_month_day& __ymd,
basic_string<_CharT, _Traits, _Alloc>* __abbrev = nullptr,
minutes* __offset = nullptr)
{
using __format::_ChronoParts;
auto __need = _ChronoParts::_Year | _ChronoParts::_Month
| _ChronoParts::_Day;
__detail::_Parser<> __p(__need);
if (__p(__is, __fmt, __abbrev, __offset))
__ymd = __p._M_ymd;
return __is;
}
template<typename _CharT, typename _Traits>
inline basic_ostream<_CharT, _Traits>&
operator<<(basic_ostream<_CharT, _Traits>& __os,
const year_month_day_last& __ymdl)
{
// As above, just write straight to a stringstream, as if by "{}/{:L}"
basic_stringstream<_CharT> __os2;
__os2.imbue(__os.getloc());
__os2 << __ymdl.year();
if constexpr (is_same_v<_CharT, char>)
__os2 << '/';
else
__os2 << L'/';
__os2 << __ymdl.month_day_last();
__os << __os2.view();
return __os;
}
template<typename _CharT, typename _Traits>
inline basic_ostream<_CharT, _Traits>&
operator<<(basic_ostream<_CharT, _Traits>& __os,
const year_month_weekday& __ymwd)
{
// As above, just write straight to a stringstream, as if by
// "{}/{:L}/{:L}"
basic_stringstream<_CharT> __os2;
__os2.imbue(__os.getloc());
_CharT __slash;
if constexpr (is_same_v<_CharT, char>)
__slash = '/';
else
__slash = L'/';
__os2 << __ymwd.year() << __slash << __ymwd.month() << __slash
<< __ymwd.weekday_indexed();
__os << __os2.view();
return __os;
}
template<typename _CharT, typename _Traits>
inline basic_ostream<_CharT, _Traits>&
operator<<(basic_ostream<_CharT, _Traits>& __os,
const year_month_weekday_last& __ymwdl)
{
// As above, just write straight to a stringstream, as if by
// "{}/{:L}/{:L}"
basic_stringstream<_CharT> __os2;
__os2.imbue(__os.getloc());
_CharT __slash;
if constexpr (is_same_v<_CharT, char>)
__slash = '/';
else
__slash = L'/';
__os2 << __ymwdl.year() << __slash << __ymwdl.month() << __slash
<< __ymwdl.weekday_last();
__os << __os2.view();
return __os;
}
template<typename _CharT, typename _Traits, typename _Duration>
inline basic_ostream<_CharT, _Traits>&
operator<<(basic_ostream<_CharT, _Traits>& __os,
const hh_mm_ss<_Duration>& __hms)
{
return __os << format(__os.getloc(), _GLIBCXX_WIDEN("{:L%T}"), __hms);
}
#if _GLIBCXX_USE_CXX11_ABI || ! _GLIBCXX_USE_DUAL_ABI
/// Writes a sys_info object to an ostream in an unspecified format.
template<typename _CharT, typename _Traits>
basic_ostream<_CharT, _Traits>&
operator<<(basic_ostream<_CharT, _Traits>& __os, const sys_info& __i)
{
__os << '[' << __i.begin << ',' << __i.end
<< ',' << hh_mm_ss(__i.offset) << ',' << __i.save
<< ',' << __i.abbrev << ']';
return __os;
}
/// Writes a local_info object to an ostream in an unspecified format.
template<typename _CharT, typename _Traits>
basic_ostream<_CharT, _Traits>&
operator<<(basic_ostream<_CharT, _Traits>& __os, const local_info& __li)
{
__os << '[';
if (__li.result == local_info::unique)
__os << __li.first;
else
{
if (__li.result == local_info::nonexistent)
__os << "nonexistent";
else
__os << "ambiguous";
__os << " local time between " << __li.first;
__os << " and " << __li.second;
}
__os << ']';
return __os;
}
template<typename _CharT, typename _Traits, typename _Duration,
typename _TimeZonePtr>
inline basic_ostream<_CharT, _Traits>&
operator<<(basic_ostream<_CharT, _Traits>& __os,
const zoned_time<_Duration, _TimeZonePtr>& __t)
{
__os << format(__os.getloc(), _GLIBCXX_WIDEN("{:L%F %T %Z}"), __t);
return __os;
}
#endif
template<typename _CharT, typename _Traits, typename _Duration>
requires (!treat_as_floating_point_v<typename _Duration::rep>)
&& ratio_less_v<typename _Duration::period, days::period>
inline basic_ostream<_CharT, _Traits>&
operator<<(basic_ostream<_CharT, _Traits>& __os,
const sys_time<_Duration>& __tp)
{
__os << std::format(__os.getloc(), _GLIBCXX_WIDEN("{:L%F %T}"), __tp);
return __os;
}
template<typename _CharT, typename _Traits>
inline basic_ostream<_CharT, _Traits>&
operator<<(basic_ostream<_CharT, _Traits>& __os, const sys_days& __dp)
{
__os << year_month_day{__dp};
return __os;
}
template<typename _CharT, typename _Traits, typename _Duration,
typename _Alloc = allocator<_CharT>>
basic_istream<_CharT, _Traits>&
from_stream(basic_istream<_CharT, _Traits>& __is, const _CharT* __fmt,
sys_time<_Duration>& __tp,
basic_string<_CharT, _Traits, _Alloc>* __abbrev = nullptr,
minutes* __offset = nullptr)
{
minutes __off{};
if (!__offset)
__offset = &__off;
using __format::_ChronoParts;
auto __need = _ChronoParts::_Year | _ChronoParts::_Month
| _ChronoParts::_Day | _ChronoParts::_TimeOfDay;
__detail::_Parser_t<_Duration> __p(__need);
if (__p(__is, __fmt, __abbrev, __offset))
{
if (__p._M_is_leap_second)
__is.setstate(ios_base::failbit);
else
{
auto __st = __p._M_sys_days + __p._M_time - *__offset;
__tp = chrono::time_point_cast<_Duration>(__st);
}
}
return __is;
}
template<typename _CharT, typename _Traits, typename _Duration>
inline basic_ostream<_CharT, _Traits>&
operator<<(basic_ostream<_CharT, _Traits>& __os,
const utc_time<_Duration>& __t)
{
__os << std::format(__os.getloc(), _GLIBCXX_WIDEN("{:L%F %T}"), __t);
return __os;
}
template<typename _CharT, typename _Traits, typename _Duration,
typename _Alloc = allocator<_CharT>>
inline basic_istream<_CharT, _Traits>&
from_stream(basic_istream<_CharT, _Traits>& __is, const _CharT* __fmt,
utc_time<_Duration>& __tp,
basic_string<_CharT, _Traits, _Alloc>* __abbrev = nullptr,
minutes* __offset = nullptr)
{
minutes __off{};
if (!__offset)
__offset = &__off;
using __format::_ChronoParts;
auto __need = _ChronoParts::_Year | _ChronoParts::_Month
| _ChronoParts::_Day | _ChronoParts::_TimeOfDay;
__detail::_Parser_t<_Duration> __p(__need);
if (__p(__is, __fmt, __abbrev, __offset))
{
// Converting to utc_time before adding _M_time is necessary for
// "23:59:60" to correctly produce a time within a leap second.
auto __ut = utc_clock::from_sys(__p._M_sys_days) + __p._M_time
- *__offset;
__tp = chrono::time_point_cast<_Duration>(__ut);
}
return __is;
}
template<typename _CharT, typename _Traits, typename _Duration>
inline basic_ostream<_CharT, _Traits>&
operator<<(basic_ostream<_CharT, _Traits>& __os,
const tai_time<_Duration>& __t)
{
__os << std::format(__os.getloc(), _GLIBCXX_WIDEN("{:L%F %T}"), __t);
return __os;
}
template<typename _CharT, typename _Traits, typename _Duration,
typename _Alloc = allocator<_CharT>>
inline basic_istream<_CharT, _Traits>&
from_stream(basic_istream<_CharT, _Traits>& __is, const _CharT* __fmt,
tai_time<_Duration>& __tp,
basic_string<_CharT, _Traits, _Alloc>* __abbrev = nullptr,
minutes* __offset = nullptr)
{
minutes __off{};
if (!__offset)
__offset = &__off;
using __format::_ChronoParts;
auto __need = _ChronoParts::_Year | _ChronoParts::_Month
| _ChronoParts::_Day | _ChronoParts::_TimeOfDay;
__detail::_Parser_t<_Duration> __p(__need);
if (__p(__is, __fmt, __abbrev, __offset))
{
if (__p._M_is_leap_second)
__is.setstate(ios_base::failbit);
else
{
auto __st = __p._M_sys_days + __p._M_time - *__offset;
auto __tt = tai_clock::from_utc(utc_clock::from_sys(__st));
__tp = chrono::time_point_cast<_Duration>(__tt);
}
}
return __is;
}
template<typename _CharT, typename _Traits, typename _Duration>
inline basic_ostream<_CharT, _Traits>&
operator<<(basic_ostream<_CharT, _Traits>& __os,
const gps_time<_Duration>& __t)
{
__os << std::format(__os.getloc(), _GLIBCXX_WIDEN("{:L%F %T}"), __t);
return __os;
}
template<typename _CharT, typename _Traits, typename _Duration,
typename _Alloc = allocator<_CharT>>
inline basic_istream<_CharT, _Traits>&
from_stream(basic_istream<_CharT, _Traits>& __is, const _CharT* __fmt,
gps_time<_Duration>& __tp,
basic_string<_CharT, _Traits, _Alloc>* __abbrev = nullptr,
minutes* __offset = nullptr)
{
minutes __off{};
if (!__offset)
__offset = &__off;
using __format::_ChronoParts;
auto __need = _ChronoParts::_Year | _ChronoParts::_Month
| _ChronoParts::_Day | _ChronoParts::_TimeOfDay;
__detail::_Parser_t<_Duration> __p(__need);
if (__p(__is, __fmt, __abbrev, __offset))
{
if (__p._M_is_leap_second)
__is.setstate(ios_base::failbit);
else
{
auto __st = __p._M_sys_days + __p._M_time - *__offset;
auto __tt = gps_clock::from_utc(utc_clock::from_sys(__st));
__tp = chrono::time_point_cast<_Duration>(__tt);
}
}
return __is;
}
template<typename _CharT, typename _Traits, typename _Duration>
inline basic_ostream<_CharT, _Traits>&
operator<<(basic_ostream<_CharT, _Traits>& __os,
const file_time<_Duration>& __t)
{
__os << std::format(__os.getloc(), _GLIBCXX_WIDEN("{:L%F %T}"), __t);
return __os;
}
template<typename _CharT, typename _Traits, typename _Duration,
typename _Alloc = allocator<_CharT>>
inline basic_istream<_CharT, _Traits>&
from_stream(basic_istream<_CharT, _Traits>& __is, const _CharT* __fmt,
file_time<_Duration>& __tp,
basic_string<_CharT, _Traits, _Alloc>* __abbrev = nullptr,
minutes* __offset = nullptr)
{
sys_time<_Duration> __st;
if (chrono::from_stream(__is, __fmt, __st, __abbrev, __offset))
__tp = chrono::time_point_cast<_Duration>(file_clock::from_sys(__st));
return __is;
}
template<typename _CharT, typename _Traits, typename _Duration>
inline basic_ostream<_CharT, _Traits>&
operator<<(basic_ostream<_CharT, _Traits>& __os,
const local_time<_Duration>& __lt)
{
__os << sys_time<_Duration>{__lt.time_since_epoch()};
return __os;
}
template<typename _CharT, typename _Traits, typename _Duration,
typename _Alloc = allocator<_CharT>>
basic_istream<_CharT, _Traits>&
from_stream(basic_istream<_CharT, _Traits>& __is, const _CharT* __fmt,
local_time<_Duration>& __tp,
basic_string<_CharT, _Traits, _Alloc>* __abbrev = nullptr,
minutes* __offset = nullptr)
{
using __format::_ChronoParts;
auto __need = _ChronoParts::_Year | _ChronoParts::_Month
| _ChronoParts::_Day | _ChronoParts::_TimeOfDay;
__detail::_Parser_t<_Duration> __p(__need);
if (__p(__is, __fmt, __abbrev, __offset))
{
days __d = __p._M_sys_days.time_since_epoch();
auto __t = local_days(__d) + __p._M_time; // ignore offset
__tp = chrono::time_point_cast<_Duration>(__t);
}
return __is;
}
// [time.parse] parsing
namespace __detail
{
template<typename _Parsable, typename _CharT,
typename _Traits = std::char_traits<_CharT>,
typename... _OptArgs>
concept __parsable = requires (basic_istream<_CharT, _Traits>& __is,
const _CharT* __fmt, _Parsable& __tp,
_OptArgs*... __args)
{ from_stream(__is, __fmt, __tp, __args...); };
template<typename _Parsable, typename _CharT,
typename _Traits = char_traits<_CharT>,
typename _Alloc = allocator<_CharT>>
struct _Parse
{
private:
using __string_type = basic_string<_CharT, _Traits, _Alloc>;
public:
_Parse(const _CharT* __fmt, _Parsable& __tp,
basic_string<_CharT, _Traits, _Alloc>* __abbrev = nullptr,
minutes* __offset = nullptr)
: _M_fmt(__fmt), _M_tp(std::__addressof(__tp)),
_M_abbrev(__abbrev), _M_offset(__offset)
{ }
_Parse(_Parse&&) = delete;
_Parse& operator=(_Parse&&) = delete;
private:
using __stream_type = basic_istream<_CharT, _Traits>;
const _CharT* const _M_fmt;
_Parsable* const _M_tp;
__string_type* const _M_abbrev;
minutes* const _M_offset;
friend __stream_type&
operator>>(__stream_type& __is, _Parse&& __p)
{
if (__p._M_offset)
from_stream(__is, __p._M_fmt, *__p._M_tp, __p._M_abbrev,
__p._M_offset);
else if (__p._M_abbrev)
from_stream(__is, __p._M_fmt, *__p._M_tp, __p._M_abbrev);
else
from_stream(__is, __p._M_fmt, *__p._M_tp);
return __is;
}
friend void operator>>(__stream_type&, _Parse&) = delete;
friend void operator>>(__stream_type&, const _Parse&) = delete;
};
} // namespace __detail
template<typename _CharT, __detail::__parsable<_CharT> _Parsable>
[[nodiscard, __gnu__::__access__(__read_only__, 1)]]
inline auto
parse(const _CharT* __fmt, _Parsable& __tp)
{ return __detail::_Parse<_Parsable, _CharT>(__fmt, __tp); }
template<typename _CharT, typename _Traits, typename _Alloc,
__detail::__parsable<_CharT, _Traits> _Parsable>
[[nodiscard]]
inline auto
parse(const basic_string<_CharT, _Traits, _Alloc>& __fmt, _Parsable& __tp)
{
return __detail::_Parse<_Parsable, _CharT, _Traits>(__fmt.c_str(), __tp);
}
template<typename _CharT, typename _Traits, typename _Alloc,
typename _StrT = basic_string<_CharT, _Traits, _Alloc>,
__detail::__parsable<_CharT, _Traits, _StrT> _Parsable>
[[nodiscard, __gnu__::__access__(__read_only__, 1)]]
inline auto
parse(const _CharT* __fmt, _Parsable& __tp,
basic_string<_CharT, _Traits, _Alloc>& __abbrev)
{
auto __pa = std::__addressof(__abbrev);
return __detail::_Parse<_Parsable, _CharT, _Traits, _Alloc>(__fmt, __tp,
__pa);
}
template<typename _CharT, typename _Traits, typename _Alloc,
typename _StrT = basic_string<_CharT, _Traits, _Alloc>,
__detail::__parsable<_CharT, _Traits, _StrT> _Parsable>
[[nodiscard]]
inline auto
parse(const basic_string<_CharT, _Traits, _Alloc>& __fmt, _Parsable& __tp,
basic_string<_CharT, _Traits, _Alloc>& __abbrev)
{
auto __pa = std::__addressof(__abbrev);
return __detail::_Parse<_Parsable, _CharT, _Traits, _Alloc>(__fmt.c_str(),
__tp, __pa);
}
template<typename _CharT, typename _Traits = char_traits<_CharT>,
typename _StrT = basic_string<_CharT, _Traits>,
__detail::__parsable<_CharT, _Traits, _StrT, minutes> _Parsable>
[[nodiscard, __gnu__::__access__(__read_only__, 1)]]
inline auto
parse(const _CharT* __fmt, _Parsable& __tp, minutes& __offset)
{
return __detail::_Parse<_Parsable, _CharT>(__fmt, __tp, nullptr,
&__offset);
}
template<typename _CharT, typename _Traits, typename _Alloc,
typename _StrT = basic_string<_CharT, _Traits>,
__detail::__parsable<_CharT, _Traits, _StrT, minutes> _Parsable>
[[nodiscard]]
inline auto
parse(const basic_string<_CharT, _Traits, _Alloc>& __fmt, _Parsable& __tp,
minutes& __offset)
{
return __detail::_Parse<_Parsable, _CharT, _Traits, _Alloc>(__fmt.c_str(),
__tp, nullptr,
&__offset);
}
template<typename _CharT, typename _Traits, typename _Alloc,
typename _StrT = basic_string<_CharT, _Traits, _Alloc>,
__detail::__parsable<_CharT, _Traits, _StrT, minutes> _Parsable>
[[nodiscard, __gnu__::__access__(__read_only__, 1)]]
inline auto
parse(const _CharT* __fmt, _Parsable& __tp,
basic_string<_CharT, _Traits, _Alloc>& __abbrev, minutes& __offset)
{
auto __pa = std::__addressof(__abbrev);
return __detail::_Parse<_Parsable, _CharT, _Traits, _Alloc>(__fmt, __tp,
__pa,
&__offset);
}
template<typename _CharT, typename _Traits, typename _Alloc,
typename _StrT = basic_string<_CharT, _Traits, _Alloc>,
__detail::__parsable<_CharT, _Traits, _StrT, minutes> _Parsable>
[[nodiscard]]
inline auto
parse(const basic_string<_CharT, _Traits, _Alloc>& __fmt, _Parsable& __tp,
basic_string<_CharT, _Traits, _Alloc>& __abbrev, minutes& __offset)
{
auto __pa = std::__addressof(__abbrev);
return __detail::_Parse<_Parsable, _CharT, _Traits, _Alloc>(__fmt.c_str(),
__tp, __pa,
&__offset);
}
/// @cond undocumented
template<typename _Duration>
template<typename _CharT, typename _Traits, typename _Alloc>
basic_istream<_CharT, _Traits>&
__detail::_Parser<_Duration>::
operator()(basic_istream<_CharT, _Traits>& __is, const _CharT* __fmt,
basic_string<_CharT, _Traits, _Alloc>* __abbrev,
minutes* __offset)
{
using sentry = typename basic_istream<_CharT, _Traits>::sentry;
ios_base::iostate __err = ios_base::goodbit;
if (sentry __cerb(__is, true); __cerb)
{
locale __loc = __is.getloc();
auto& __tmget = std::use_facet<std::time_get<_CharT>>(__loc);
auto& __tmpunct = std::use_facet<std::__timepunct<_CharT>>(__loc);
// RAII type to save and restore stream state.
struct _Stream_state
{
explicit
_Stream_state(basic_istream<_CharT, _Traits>& __i)
: _M_is(__i),
_M_flags(__i.flags(ios_base::skipws | ios_base::dec)),
_M_w(__i.width(0))
{ }
~_Stream_state()
{
_M_is.flags(_M_flags);
_M_is.width(_M_w);
}
_Stream_state(_Stream_state&&) = delete;
basic_istream<_CharT, _Traits>& _M_is;
ios_base::fmtflags _M_flags;
streamsize _M_w;
};
auto __is_failed = [](ios_base::iostate __e) {
return static_cast<bool>(__e & ios_base::failbit);
};
// Read an unsigned integer from the stream and return it.
// Extract no more than __n digits. Set __err on error.
auto __read_unsigned = [&] (int __n) {
return _S_read_unsigned(__is, __err, __n);
};
// Read a signed integer from the stream and return it.
// Extract no more than __n digits. Set __err on error.
auto __read_signed = [&] (int __n) {
return _S_read_signed(__is, __err, __n);
};
// Read an expected character from the stream.
auto __read_chr = [&__is, &__err] (_CharT __c) {
return _S_read_chr(__is, __err, __c);
};
using __format::_ChronoParts;
_ChronoParts __parts{};
const year __bad_y = --year::min(); // SHRT_MIN
const month __bad_mon(255);
const day __bad_day(255);
const weekday __bad_wday(255);
const hours __bad_h(-1);
const minutes __bad_min(-9999);
const seconds __bad_sec(-1);
year __y = __bad_y, __yy = __bad_y; // %Y, %yy
year __iso_y = __bad_y, __iso_yy = __bad_y; // %G, %g
month __m = __bad_mon; // %m
day __d = __bad_day; // %d
weekday __wday = __bad_wday; // %a %A %u %w
hours __h = __bad_h, __h12 = __bad_h; // %H, %I
minutes __min = __bad_min; // %M
_Duration __s = __bad_sec; // %S
int __ampm = 0; // %p
int __iso_wk = -1, __sunday_wk = -1, __monday_wk = -1; // %V, %U, %W
int __century = -1; // %C
int __dayofyear = -1; // %j (for non-duration)
minutes __tz_offset = __bad_min;
basic_string<_CharT, _Traits> __tz_abbr;
if ((_M_need & _ChronoParts::_TimeOfDay)
&& (_M_need & _ChronoParts::_Year))
{
// For time_points assume "00:00:00" is implicitly present,
// so we don't fail to parse if it's not (PR libstdc++/114240).
// We will still fail to parse if there's no year+month+day.
__h = hours(0);
__parts = _ChronoParts::_TimeOfDay;
}
// bool __is_neg = false; // TODO: how is this handled for parsing?
_CharT __mod{}; // One of 'E' or 'O' or nul.
unsigned __num = 0; // Non-zero for N modifier.
bool __is_flag = false; // True if we're processing a % flag.
constexpr bool __is_floating
= treat_as_floating_point_v<typename _Duration::rep>;
// If an out-of-range value is extracted (e.g. 61min for %M),
// do not set failbit immediately because we might not need it
// (e.g. parsing chrono::year doesn't care about invalid %M values).
// Instead set the variable back to its initial 'bad' state,
// and also set related variables corresponding to the same field
// (e.g. a bad %M value for __min should also reset __h and __s).
// If a valid value is needed later the bad value will cause failure.
// For some fields we don't know the correct range when parsing and
// we have to be liberal in what we accept, e.g. we allow 366 for
// day-of-year because that's valid in leap years, and we allow 31
// for day-of-month. If those values are needed to determine the
// result then we can do a correct range check at the end when we
// know the how many days the relevant year or month actually has.
while (*__fmt)
{
_CharT __c = *__fmt++;
if (!__is_flag)
{
if (__c == '%')
__is_flag = true; // This is the start of a flag.
else if (std::isspace(__c, __loc))
std::ws(__is); // Match zero or more whitespace characters.
else if (!__read_chr(__c)) [[unlikely]]
break; // Failed to match the expected character.
continue; // Process next character in the format string.
}
// Now processing a flag.
switch (__c)
{
case 'a': // Locale's weekday name
case 'A': // (full or abbreviated, matched case-insensitively).
if (__mod || __num) [[unlikely]]
__err = ios_base::failbit;
else
{
struct tm __tm{};
__tmget.get(__is, {}, __is, __err, &__tm,
__fmt - 2, __fmt);
if (!__is_failed(__err))
__wday = weekday(__tm.tm_wday);
}
__parts |= _ChronoParts::_Weekday;
break;
case 'b': // Locale's month name
case 'h': // (full or abbreviated, matched case-insensitively).
case 'B':
if (__mod || __num) [[unlikely]]
__err = ios_base::failbit;
else
{
// strptime behaves differently for %b and %B,
// but chrono::parse says they're equivalent.
// Luckily libstdc++ std::time_get works as needed.
struct tm __tm{};
__tmget.get(__is, {}, __is, __err, &__tm,
__fmt - 2, __fmt);
if (!__is_failed(__err))
__m = month(__tm.tm_mon + 1);
}
__parts |= _ChronoParts::_Month;
break;
case 'c': // Locale's date and time representation.
if (__mod == 'O' || __num) [[unlikely]]
__err |= ios_base::failbit;
else
{
struct tm __tm{};
__tmget.get(__is, {}, __is, __err, &__tm,
__fmt - 2 - (__mod == 'E'), __fmt);
if (!__is_failed(__err))
{
__y = year(__tm.tm_year + 1900);
__m = month(__tm.tm_mon + 1);
__d = day(__tm.tm_mday);
__h = hours(__tm.tm_hour);
__min = minutes(__tm.tm_min);
__s = seconds(__tm.tm_sec);
}
}
__parts |= _ChronoParts::_DateTime;
break;
case 'C': // Century
if (!__mod) [[likely]]
{
auto __v = __read_signed(__num ? __num : 2);
if (!__is_failed(__err))
{
int __cmin = (int)year::min() / 100;
int __cmax = (int)year::max() / 100;
if (__cmin <= __v && __v <= __cmax)
__century = __v * 100;
else
__century = -2; // This prevents guessing century.
}
}
else if (__mod == 'E')
{
struct tm __tm{};
__tmget.get(__is, {}, __is, __err, &__tm,
__fmt - 3, __fmt);
if (!__is_failed(__err))
__century = __tm.tm_year;
}
else [[unlikely]]
__err |= ios_base::failbit;
// N.B. don't set this here: __parts |= _ChronoParts::_Year;
break;
case 'd': // Day of month (1-31)
case 'e':
if (!__mod) [[likely]]
{
auto __v = __read_unsigned(__num ? __num : 2);
if (!__is_failed(__err))
__d = day(__v);
}
else if (__mod == 'O')
{
struct tm __tm{};
__tmget.get(__is, {}, __is, __err, &__tm,
__fmt - 3, __fmt);
if (!__is_failed(__err))
__d = day(__tm.tm_mday);
}
else [[unlikely]]
__err |= ios_base::failbit;
__parts |= _ChronoParts::_Day;
break;
case 'D': // %m/%d/%y
if (__mod || __num) [[unlikely]]
__err |= ios_base::failbit;
else
{
auto __month = __read_unsigned(2); // %m
__read_chr('/');
auto __day = __read_unsigned(2); // %d
__read_chr('/');
auto __year = __read_unsigned(2); // %y
if (__is_failed(__err))
break;
__y = year(__year + 1900 + 100 * int(__year < 69));
__m = month(__month);
__d = day(__day);
if (!year_month_day(__y, __m, __d).ok())
{
__y = __yy = __iso_y = __iso_yy = __bad_y;
__m = __bad_mon;
__d = __bad_day;
break;
}
}
__parts |= _ChronoParts::_Date;
break;
case 'F': // %Y-%m-%d - any N modifier only applies to %Y.
if (__mod) [[unlikely]]
__err |= ios_base::failbit;
else
{
auto __year = __read_signed(__num ? __num : 4); // %Y
__read_chr('-');
auto __month = __read_unsigned(2); // %m
__read_chr('-');
auto __day = __read_unsigned(2); // %d
if (__is_failed(__err))
break;
__y = year(__year);
__m = month(__month);
__d = day(__day);
if (!year_month_day(__y, __m, __d).ok())
{
__y = __yy = __iso_y = __iso_yy = __bad_y;
__m = __bad_mon;
__d = __bad_day;
break;
}
}
__parts |= _ChronoParts::_Date;
break;
case 'g': // Last two digits of ISO week-based year.
if (__mod) [[unlikely]]
__err |= ios_base::failbit;
else
{
auto __val = __read_unsigned(__num ? __num : 2);
if (__val >= 0 && __val <= 99)
{
__iso_yy = year(__val);
if (__century == -1) // No %C has been parsed yet.
__century = 2000;
}
else
__iso_yy = __iso_y = __y = __yy = __bad_y;
}
__parts |= _ChronoParts::_Year;
break;
case 'G': // ISO week-based year.
if (__mod) [[unlikely]]
__err |= ios_base::failbit;
else
__iso_y = year(__read_unsigned(__num ? __num : 4));
__parts |= _ChronoParts::_Year;
break;
case 'H': // 24-hour (00-23)
case 'I': // 12-hour (1-12)
if (__mod == 'E') [[unlikely]]
__err |= ios_base::failbit;
else if (__mod == 'O')
{
#if 0
struct tm __tm{};
__tm.tm_ampm = 1;
__tmget.get(__is, {}, __is, __err, &__tm,
__fmt - 3, __fmt);
if (!__is_failed(__err))
{
if (__c == 'I')
{
__h12 = hours(__tm.tm_hour);
__h = __bad_h;
}
else
__h = hours(__tm.tm_hour);
}
#else
// XXX %OI seems to be unimplementable.
__err |= ios_base::failbit;
#endif
}
else
{
auto __val = __read_unsigned(__num ? __num : 2);
if (__c == 'I' && __val >= 1 && __val <= 12)
{
__h12 = hours(__val);
__h = __bad_h;
}
else if (__c == 'H' && __val >= 0 && __val <= 23)
{
__h = hours(__val);
__h12 = __bad_h;
}
else
{
if (_M_need & _ChronoParts::_TimeOfDay)
__err |= ios_base::failbit;
break;
}
}
__parts |= _ChronoParts::_TimeOfDay;
break;
case 'j': // For duration, count of days, otherwise day of year
if (__mod) [[unlikely]]
__err |= ios_base::failbit;
else if (_M_need == _ChronoParts::_TimeOfDay) // duration
{
auto __val = __read_signed(__num ? __num : 3);
if (!__is_failed(__err))
{
__h = days(__val); // __h will get added to _M_time
__parts |= _ChronoParts::_TimeOfDay;
}
}
else
{
__dayofyear = __read_unsigned(__num ? __num : 3);
// N.B. do not alter __parts here, done after loop.
// No need for range checking here either.
}
break;
case 'm': // Month (1-12)
if (__mod == 'E') [[unlikely]]
__err |= ios_base::failbit;
else if (__mod == 'O')
{
struct tm __tm{};
__tmget.get(__is, {}, __is, __err, &__tm,
__fmt - 2, __fmt);
if (!__is_failed(__err))
__m = month(__tm.tm_mon + 1);
}
else
{
auto __val = __read_unsigned(__num ? __num : 2);
if (__val >= 1 && __val <= 12)
__m = month(__val);
else
__m = __bad_mon;
}
__parts |= _ChronoParts::_Month;
break;
case 'M': // Minutes
if (__mod == 'E') [[unlikely]]
__err |= ios_base::failbit;
else if (__mod == 'O')
{
struct tm __tm{};
__tmget.get(__is, {}, __is, __err, &__tm,
__fmt - 2, __fmt);
if (!__is_failed(__err))
__min = minutes(__tm.tm_min);
}
else
{
auto __val = __read_unsigned(__num ? __num : 2);
if (0 <= __val && __val < 60)
__min = minutes(__val);
else
{
if (_M_need & _ChronoParts::_TimeOfDay)
__err |= ios_base::failbit;
break;
}
}
__parts |= _ChronoParts::_TimeOfDay;
break;
case 'p': // Locale's AM/PM designation for 12-hour clock.
if (__mod || __num)
__err |= ios_base::failbit;
else
{
// Can't use std::time_get here as it can't parse %p
// in isolation without %I. This might be faster anyway.
const _CharT* __ampms[2];
__tmpunct._M_am_pm(__ampms);
int __n = 0, __which = 3;
while (__which != 0)
{
auto __i = __is.peek();
if (_Traits::eq_int_type(__i, _Traits::eof()))
{
__err |= ios_base::eofbit | ios_base::failbit;
break;
}
__i = std::toupper(_Traits::to_char_type(__i), __loc);
if (__which & 1)
{
if (__i != std::toupper(__ampms[0][__n], __loc))
__which ^= 1;
else if (__ampms[0][__n + 1] == _CharT())
{
__which = 1;
(void) __is.get();
break;
}
}
if (__which & 2)
{
if (__i != std::toupper(__ampms[1][__n], __loc))
__which ^= 2;
else if (__ampms[1][__n + 1] == _CharT())
{
__which = 2;
(void) __is.get();
break;
}
}
if (__which)
(void) __is.get();
++__n;
}
if (__which == 0 || __which == 3)
__err |= ios_base::failbit;
else
__ampm = __which;
}
break;
case 'r': // Locale's 12-hour time.
if (__mod || __num)
__err |= ios_base::failbit;
else
{
struct tm __tm{};
__tmget.get(__is, {}, __is, __err, &__tm,
__fmt - 2, __fmt);
if (!__is_failed(__err))
{
__h = hours(__tm.tm_hour);
__min = minutes(__tm.tm_min);
__s = seconds(__tm.tm_sec);
}
}
__parts |= _ChronoParts::_TimeOfDay;
break;
case 'R': // %H:%M
case 'T': // %H:%M:%S
if (__mod || __num) [[unlikely]]
{
__err |= ios_base::failbit;
break;
}
else
{
auto __val = __read_unsigned(2);
if (__val == -1 || __val > 23) [[unlikely]]
{
if (_M_need & _ChronoParts::_TimeOfDay)
__err |= ios_base::failbit;
break;
}
if (!__read_chr(':')) [[unlikely]]
break;
__h = hours(__val);
__val = __read_unsigned(2);
if (__val == -1 || __val > 60) [[unlikely]]
{
if (_M_need & _ChronoParts::_TimeOfDay)
__err |= ios_base::failbit;
break;
}
__min = minutes(__val);
if (__c == 'R')
{
__parts |= _ChronoParts::_TimeOfDay;
break;
}
else if (!__read_chr(':')) [[unlikely]]
break;
}
[[fallthrough]];
case 'S': // Seconds
if (__mod == 'E') [[unlikely]]
__err |= ios_base::failbit;
else if (__mod == 'O')
{
struct tm __tm{};
__tmget.get(__is, {}, __is, __err, &__tm,
__fmt - 3, __fmt);
if (!__is_failed(__err))
__s = seconds(__tm.tm_sec);
}
else if constexpr (_Duration::period::den == 1
&& !__is_floating)
{
auto __val = __read_unsigned(__num ? __num : 2);
if (0 <= __val && __val <= 59) [[likely]]
__s = seconds(__val);
else
{
if (_M_need & _ChronoParts::_TimeOfDay)
__err |= ios_base::failbit;
break;
}
}
else // Read fractional seconds
{
basic_stringstream<_CharT> __buf;
auto __digit = _S_try_read_digit(__is, __err);
if (__digit != -1)
{
__buf.put(_CharT('0') + __digit);
__digit = _S_try_read_digit(__is, __err);
if (__digit != -1)
__buf.put(_CharT('0') + __digit);
}
auto __i = __is.peek();
if (_Traits::eq_int_type(__i, _Traits::eof()))
__err |= ios_base::eofbit;
else
{
_CharT __dp = '.';
if (__loc != locale::classic())
{
auto& __np = use_facet<numpunct<_CharT>>(__loc);
__dp = __np.decimal_point();
}
_CharT __c = _Traits::to_char_type(__i);
if (__c == __dp)
{
(void) __is.get();
__buf.put('.');
int __prec
= hh_mm_ss<_Duration>::fractional_width;
do
{
__digit = _S_try_read_digit(__is, __err);
if (__digit != -1)
__buf.put(_CharT('0') + __digit);
else
break;
}
while (--__prec);
}
}
if (!__is_failed(__err)) [[likely]]
{
long double __val{};
#if __cpp_lib_to_chars
string __str = std::move(__buf).str();
auto __first = __str.data();
auto __last = __first + __str.size();
using enum chars_format;
auto [ptr, ec] = std::from_chars(__first, __last,
__val, fixed);
if ((bool)ec || ptr != __last) [[unlikely]]
__err |= ios_base::failbit;
else
#else
if (__buf >> __val)
#endif
{
duration<long double> __fs(__val);
if constexpr (__is_floating)
__s = __fs;
else
__s = chrono::round<_Duration>(__fs);
}
}
}
__parts |= _ChronoParts::_TimeOfDay;
break;
case 'u': // ISO weekday (1-7)
case 'w': // Weekday (0-6)
if (__mod == 'E') [[unlikely]]
__err |= ios_base::failbit;
else if (__mod == 'O')
{
if (__c == 'w')
{
struct tm __tm{};
__tmget.get(__is, {}, __is, __err, &__tm,
__fmt - 3, __fmt);
if (!__is_failed(__err))
__wday = weekday(__tm.tm_wday);
}
else
__err |= ios_base::failbit;
}
else
{
const int __lo = __c == 'u' ? 1 : 0;
const int __hi = __lo + 6;
auto __val = __read_unsigned(__num ? __num : 1);
if (__lo <= __val && __val <= __hi)
__wday = weekday(__val);
else
{
__wday = __bad_wday;
break;
}
}
__parts |= _ChronoParts::_Weekday;
break;
case 'U': // Week number of the year (from first Sunday).
case 'V': // ISO week-based week number.
case 'W': // Week number of the year (from first Monday).
if (__mod == 'E') [[unlikely]]
__err |= ios_base::failbit;
else if (__mod == 'O')
{
if (__c == 'V') [[unlikely]]
__err |= ios_base::failbit;
else
{
// TODO nl_langinfo_l(ALT_DIGITS) ?
// Not implementable using std::time_get.
}
}
else
{
const int __lo = __c == 'V' ? 1 : 0;
const int __hi = 53;
auto __val = __read_unsigned(__num ? __num : 2);
if (__lo <= __val && __val <= __hi)
{
switch (__c)
{
case 'U':
__sunday_wk = __val;
break;
case 'V':
__iso_wk = __val;
break;
case 'W':
__monday_wk = __val;
break;
}
}
else
__iso_wk = __sunday_wk = __monday_wk = -1;
}
// N.B. do not alter __parts here, done after loop.
break;
case 'x': // Locale's date representation.
if (__mod == 'O' || __num) [[unlikely]]
__err |= ios_base::failbit;
else
{
struct tm __tm{};
__tmget.get(__is, {}, __is, __err, &__tm,
__fmt - 2 - (__mod == 'E'), __fmt);
if (!__is_failed(__err))
{
__y = year(__tm.tm_year + 1900);
__m = month(__tm.tm_mon + 1);
__d = day(__tm.tm_mday);
}
}
__parts |= _ChronoParts::_Date;
break;
case 'X': // Locale's time representation.
if (__mod == 'O' || __num) [[unlikely]]
__err |= ios_base::failbit;
else
{
struct tm __tm{};
__tmget.get(__is, {}, __is, __err, &__tm,
__fmt - 2 - (__mod == 'E'), __fmt);
if (!__is_failed(__err))
{
__h = hours(__tm.tm_hour);
__min = minutes(__tm.tm_min);
__s = seconds(__tm.tm_sec);
}
}
__parts |= _ChronoParts::_TimeOfDay;
break;
case 'y': // Last two digits of year.
if (__mod) [[unlikely]]
{
struct tm __tm{};
__tmget.get(__is, {}, __is, __err, &__tm,
__fmt - 3, __fmt);
if (!__is_failed(__err))
{
int __cent = __tm.tm_year < 2000 ? 1900 : 2000;
__yy = year(__tm.tm_year - __cent);
if (__century == -1) // No %C has been parsed yet.
__century = __cent;
}
}
else
{
auto __val = __read_unsigned(__num ? __num : 2);
if (__val >= 0 && __val <= 99)
{
__yy = year(__val);
if (__century == -1) // No %C has been parsed yet.
__century = __val < 69 ? 2000 : 1900;
}
else
__y = __yy = __iso_yy = __iso_y = __bad_y;
}
__parts |= _ChronoParts::_Year;
break;
case 'Y': // Year
if (__mod == 'O') [[unlikely]]
__err |= ios_base::failbit;
else if (__mod == 'E')
{
struct tm __tm{};
__tmget.get(__is, {}, __is, __err, &__tm,
__fmt - 3, __fmt);
if (!__is_failed(__err))
__y = year(__tm.tm_year);
}
else
{
auto __val = __read_unsigned(__num ? __num : 4);
if (!__is_failed(__err))
__y = year(__val);
}
__parts |= _ChronoParts::_Year;
break;
case 'z':
if (__num) [[unlikely]]
__err |= ios_base::failbit;
else
{
// For %Ez and %Oz read [+|-][h]h[:mm].
// For %z read [+|-]hh[mm].
auto __i = __is.peek();
if (_Traits::eq_int_type(__i, _Traits::eof()))
{
__err |= ios_base::eofbit | ios_base::failbit;
break;
}
_CharT __ic = _Traits::to_char_type(__i);
const bool __neg = __ic == _CharT('-');
if (__ic == _CharT('-') || __ic == _CharT('+'))
(void) __is.get();
int_least32_t __hh;
if (__mod)
{
// Read h[h]
__hh = __read_unsigned(2);
}
else
{
// Read hh
__hh = 10 * _S_try_read_digit(__is, __err);
__hh += _S_try_read_digit(__is, __err);
}
if (__is_failed(__err))
break;
__i = __is.peek();
if (_Traits::eq_int_type(__i, _Traits::eof()))
{
__err |= ios_base::eofbit;
__tz_offset = minutes(__hh * (__neg ? -60 : 60));
break;
}
__ic = _Traits::to_char_type(__i);
bool __read_mm = false;
if (__mod)
{
if (__ic == _GLIBCXX_WIDEN(":")[0])
{
// Read [:mm] part.
(void) __is.get();
__read_mm = true;
}
}
else if (_CharT('0') <= __ic && __ic <= _CharT('9'))
{
// Read [mm] part.
__read_mm = true;
}
int_least32_t __mm = 0;
if (__read_mm)
{
__mm = 10 * _S_try_read_digit(__is, __err);
__mm += _S_try_read_digit(__is, __err);
}
if (!__is_failed(__err))
{
auto __z = __hh * 60 + __mm;
__tz_offset = minutes(__neg ? -__z : __z);
}
}
break;
case 'Z':
if (__mod || __num) [[unlikely]]
__err |= ios_base::failbit;
else
{
basic_string_view<_CharT> __x = _GLIBCXX_WIDEN("_/-+");
__tz_abbr.clear();
while (true)
{
auto __i = __is.peek();
if (!_Traits::eq_int_type(__i, _Traits::eof()))
{
_CharT __a = _Traits::to_char_type(__i);
if (std::isalnum(__a, __loc)
|| __x.find(__a) != __x.npos)
{
__tz_abbr.push_back(__a);
(void) __is.get();
continue;
}
}
else
__err |= ios_base::eofbit;
break;
}
if (__tz_abbr.empty())
__err |= ios_base::failbit;
}
break;
case 'n': // Exactly one whitespace character.
if (__mod || __num) [[unlikely]]
__err |= ios_base::failbit;
else
{
_CharT __i = __is.peek();
if (_Traits::eq_int_type(__i, _Traits::eof()))
__err |= ios_base::eofbit | ios_base::failbit;
else if (std::isspace(_Traits::to_char_type(__i), __loc))
(void) __is.get();
else
__err |= ios_base::failbit;
}
break;
case 't': // Zero or one whitespace characters.
if (__mod || __num) [[unlikely]]
__err |= ios_base::failbit;
else
{
_CharT __i = __is.peek();
if (_Traits::eq_int_type(__i, _Traits::eof()))
__err |= ios_base::eofbit;
else if (std::isspace(_Traits::to_char_type(__i), __loc))
(void) __is.get();
}
break;
case '%': // A % character.
if (__mod || __num) [[unlikely]]
__err |= ios_base::failbit;
else
__read_chr('%');
break;
case 'O': // Modifiers
case 'E':
if (__mod || __num) [[unlikely]]
{
__err |= ios_base::failbit;
break;
}
__mod = __c;
continue;
default:
if (_CharT('1') <= __c && __c <= _CharT('9'))
{
if (!__mod) [[likely]]
{
// %Nx - extract positive decimal integer N
auto __end = __fmt + _Traits::length(__fmt);
auto [__v, __ptr]
= __format::__parse_integer(__fmt - 1, __end);
if (__ptr) [[likely]]
{
__num = __v;
__fmt = __ptr;
continue;
}
}
}
__err |= ios_base::failbit;
}
if (__is_failed(__err)) [[unlikely]]
break;
__is_flag = false;
__num = 0;
__mod = _CharT();
}
if (__century >= 0)
{
if (__yy != __bad_y && __y == __bad_y)
__y = years(__century) + __yy; // Use %y instead of %Y
if (__iso_yy != __bad_y && __iso_y == __bad_y)
__iso_y = years(__century) + __iso_yy; // Use %g instead of %G
}
bool __can_use_doy = false;
bool __can_use_iso_wk = false;
bool __can_use_sun_wk = false;
bool __can_use_mon_wk = false;
// A year + day-of-year can be converted to a full date.
if (__y != __bad_y && __dayofyear >= 0)
{
__can_use_doy = true;
__parts |= _ChronoParts::_Date;
}
else if (__y != __bad_y && __wday != __bad_wday && __sunday_wk >= 0)
{
__can_use_sun_wk = true;
__parts |= _ChronoParts::_Date;
}
else if (__y != __bad_y && __wday != __bad_wday && __monday_wk >= 0)
{
__can_use_mon_wk = true;
__parts |= _ChronoParts::_Date;
}
else if (__iso_y != __bad_y && __wday != __bad_wday && __iso_wk > 0)
{
// An ISO week date can be converted to a full date.
__can_use_iso_wk = true;
__parts |= _ChronoParts::_Date;
}
if (__is_failed(__err)) [[unlikely]]
; // Don't bother doing any more work.
else if (__is_flag) [[unlikely]] // incomplete format flag
__err |= ios_base::failbit;
else if ((_M_need & __parts) == _M_need) [[likely]]
{
// We try to avoid calculating _M_sys_days and _M_ymd unless
// necessary, because converting sys_days to year_month_day
// (or vice versa) requires non-trivial calculations.
// If we have y/m/d values then use them to populate _M_ymd
// and only convert it to _M_sys_days if the caller needs that.
// But if we don't have y/m/d and need to calculate the date
// from the day-of-year or a week+weekday then we set _M_sys_days
// and only convert it to _M_ymd if the caller needs that.
// We do more error checking here, but only for the fields that
// we actually need to use. For example, we will not diagnose
// an invalid dayofyear==366 for non-leap years unless actually
// using __dayofyear. This should mean we never produce invalid
// results, but it means not all invalid inputs are diagnosed,
// e.g. "2023-01-01 366" >> "%F %j" ignores the invalid 366.
// We also do not diagnose inconsistent values for the same
// field, e.g. "2021 2022 2023" >> "%C%y %Y %Y" just uses 2023.
// Whether the caller wants _M_wd.
// The _Weekday bit is only set for chrono::weekday.
const bool __need_wday = _M_need & _ChronoParts::_Weekday;
// Whether the caller wants _M_sys_days and _M_time.
// Only true for durations and time_points.
const bool __need_time = _M_need & _ChronoParts::_TimeOfDay;
if (__need_wday && __wday != __bad_wday)
_M_wd = __wday; // Caller only wants a weekday and we have one.
else if (_M_need & _ChronoParts::_Date) // subsumes __need_wday
{
// Whether the caller wants _M_ymd.
// True for chrono::year etc., false for time_points.
const bool __need_ymd = !__need_wday && !__need_time;
if ((_M_need & _ChronoParts::_Year && __y == __bad_y)
|| (_M_need & _ChronoParts::_Month && __m == __bad_mon)
|| (_M_need & _ChronoParts::_Day && __d == __bad_day))
{
// Missing at least one of y/m/d so calculate sys_days
// from the other data we have available.
if (__can_use_doy)
{
if ((0 < __dayofyear && __dayofyear <= 365)
|| (__dayofyear == 366 && __y.is_leap()))
[[likely]]
{
_M_sys_days = sys_days(__y/January/1)
+ days(__dayofyear - 1);
if (__need_ymd)
_M_ymd = year_month_day(_M_sys_days);
}
else
__err |= ios_base::failbit;
}
else if (__can_use_iso_wk)
{
// Calculate y/m/d from ISO week date.
if (__iso_wk == 53)
{
// A year has 53 weeks iff Jan 1st is a Thursday
// or Jan 1 is a Wednesday and it's a leap year.
const sys_days __jan4(__iso_y/January/4);
weekday __wd1(__jan4 - days(3));
if (__wd1 != Thursday)
if (__wd1 != Wednesday || !__iso_y.is_leap())
__err |= ios_base::failbit;
}
if (!__is_failed(__err)) [[likely]]
{
// First Thursday is always in week one:
sys_days __w(Thursday[1]/January/__iso_y);
// First day of week-based year:
__w -= Thursday - Monday;
__w += days(weeks(__iso_wk - 1));
__w += __wday - Monday;
_M_sys_days = __w;
if (__need_ymd)
_M_ymd = year_month_day(_M_sys_days);
}
}
else if (__can_use_sun_wk)
{
// Calculate y/m/d from week number + weekday.
sys_days __wk1(__y/January/Sunday[1]);
_M_sys_days = __wk1 + weeks(__sunday_wk - 1)
+ days(__wday.c_encoding());
_M_ymd = year_month_day(_M_sys_days);
if (_M_ymd.year() != __y) [[unlikely]]
__err |= ios_base::failbit;
}
else if (__can_use_mon_wk)
{
// Calculate y/m/d from week number + weekday.
sys_days __wk1(__y/January/Monday[1]);
_M_sys_days = __wk1 + weeks(__monday_wk - 1)
+ days(__wday.c_encoding() - 1);
_M_ymd = year_month_day(_M_sys_days);
if (_M_ymd.year() != __y) [[unlikely]]
__err |= ios_base::failbit;
}
else // Should not be able to get here.
__err |= ios_base::failbit;
}
else
{
// We know that all fields the caller needs are present,
// but check that their values are in range.
// Make unwanted fields valid so that _M_ymd.ok() is true.
if (_M_need & _ChronoParts::_Year)
{
if (!__y.ok()) [[unlikely]]
__err |= ios_base::failbit;
}
else if (__y == __bad_y)
__y = 1972y; // Leap year so that Feb 29 is valid.
if (_M_need & _ChronoParts::_Month)
{
if (!__m.ok()) [[unlikely]]
__err |= ios_base::failbit;
}
else if (__m == __bad_mon)
__m = January;
if (_M_need & _ChronoParts::_Day)
{
if (__d < day(1) || __d > (__y/__m/last).day())
__err |= ios_base::failbit;
}
else if (__d == __bad_day)
__d = 1d;
if (year_month_day __ymd(__y, __m, __d); __ymd.ok())
{
_M_ymd = __ymd;
if (__need_wday || __need_time)
_M_sys_days = sys_days(_M_ymd);
}
else [[unlikely]]
__err |= ios_base::failbit;
}
if (__need_wday)
_M_wd = weekday(_M_sys_days);
}
// Need to set _M_time for both durations and time_points.
if (__need_time)
{
if (__h == __bad_h && __h12 != __bad_h)
{
if (__ampm == 1)
__h = __h12 == hours(12) ? hours(0) : __h12;
else if (__ampm == 2)
__h = __h12 == hours(12) ? __h12 : __h12 + hours(12);
else [[unlikely]]
__err |= ios_base::failbit;
}
auto __t = _M_time.zero();
bool __ok = false;
if (__h != __bad_h)
{
__ok = true;
__t += __h;
}
if (__min != __bad_min)
{
__ok = true;
__t += __min;
}
if (__s != __bad_sec)
{
__ok = true;
__t += __s;
_M_is_leap_second = __s >= seconds(60);
}
if (__ok)
_M_time = __t;
else
__err |= ios_base::failbit;
}
if (!__is_failed(__err)) [[likely]]
{
if (__offset && __tz_offset != __bad_min)
*__offset = __tz_offset;
if (__abbrev && !__tz_abbr.empty())
*__abbrev = std::move(__tz_abbr);
}
}
else
__err |= ios_base::failbit;
}
if (__err)
__is.setstate(__err);
return __is;
}
/// @endcond
#undef _GLIBCXX_WIDEN
/// @} group chrono
} // namespace chrono
_GLIBCXX_END_NAMESPACE_VERSION
} // namespace std
#endif // C++20
#endif //_GLIBCXX_CHRONO_IO_H
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