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libstdc++: Replace non-type-dependent uses of wchar_t in <format> and <chrono>

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This is one more piece of the rework to make wchar_t support in
std::format depend on _GLIBCXX_USE_WCHAR_T.

In <format> the __to_wstring_numeric function is called with arguments
that aren't type-dependent, so a declaration needs to be available, or
the calls need to be guarded by _GLIBCXX_USE_WCHAR_T.

In <chrono> there is a similarly non-type-dependent call to std::format
with a wchar_t format string, which is ill-formed when the wchar_t
overloads of std::format are not declared. Use _GLIBCXX_WIDEN to make it
type-dependent.

libstdc++-v3/ChangeLog:

	* include/bits/chrono_io.h (operator<<): Make uses of wide
	strings with streams and std::format type-dependent on _CharT.
	* include/std/format [!_GLIBCXX_USE_WCHAR_T] Do not use
	__to_wstring_numeric.
This commit is contained in:
Jonathan Wakely 2023-08-18 11:28:32 +01:00
parent 8353b9c5f5
commit 6fabf8f257
2 changed files with 14 additions and 13 deletions
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17
libstdc++-v3/include/bits/chrono_io.h
View file

@ -2390,15 +2390,14 @@ namespace __detail
__os2.imbue(__os.getloc());
__os2 << __wdi.weekday();
const auto __i = __wdi.index();
if constexpr (is_same_v<_CharT, char>)
__os2 << std::format("[{}", __i);
else
__os2 << std::format(L"[{}", __i);
basic_string_view<_CharT> __s = _GLIBCXX_WIDEN(" is not a valid 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;
__os2 << __s.substr(1);
__os << __os2.view();
return __os;
}
@ -2457,11 +2456,7 @@ namespace __detail
// As above, just write straight to a stringstream, as if by "{:L}/last"
basic_stringstream<_CharT> __os2;
__os2.imbue(__os.getloc());
__os2 << __mdl.month();
if constexpr (is_same_v<_CharT, char>)
__os2 << "/last";
else
__os2 << L"/last";
__os2 << __mdl.month() << _GLIBCXX_WIDEN("/last");
__os << __os2.view();
return __os;
}

10
libstdc++-v3/include/std/format
View file

@ -1142,13 +1142,15 @@ namespace __format
basic_string_view<_CharT> __str;
if constexpr (is_same_v<char, _CharT>)
__str = __narrow_str;
#ifdef _GLIBCXX_USE_WCHAR_T
else
{
size_t __n = __narrow_str.size();
auto __p = (_CharT*)__builtin_alloca(__n * sizeof(_CharT));
__to_wstring_numeric(__narrow_str.data(), __n, __p);
std::__to_wstring_numeric(__narrow_str.data(), __n, __p);
__str = {__p, __n};
}
#endif
if (_M_spec._M_localized)
{
@ -1624,11 +1626,13 @@ namespace __format
basic_string_view<_CharT> __str;
if constexpr (is_same_v<_CharT, char>)
__str = __narrow_str;
#ifdef _GLIBCXX_USE_WCHAR_T
else
{
__wstr = std::__to_wstring_numeric(__narrow_str);
__str = __wstr;
}
#endif
if (_M_spec._M_localized)
{
@ -2290,12 +2294,14 @@ namespace __format
basic_string_view<_CharT> __str;
if constexpr (is_same_v<_CharT, char>)
__str = string_view(__buf, __n);
#ifdef _GLIBCXX_USE_WCHAR_T
else
{
auto __p = (_CharT*)__builtin_alloca(__n * sizeof(_CharT));
__to_wstring_numeric(__buf, __n, __p);
std::__to_wstring_numeric(__buf, __n, __p);
__str = wstring_view(__p, __n);
}
#endif
#if _GLIBCXX_P2518R3
if (_M_spec._M_zero_fill)