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PR c++/91369 Implement P0784R7 changes to allocation and construction

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This patch is the first part of library support for constexpr
std::vector and std::string. This only includes the changes to
std::allocator, std::allocator_traits, std::construct_at,
std::destroy_at, std::destroy and std::destroy_n.

std::allocator::allocate and std::allocator::deallocate need to be
added so that they can be intercepted by the compiler during constant
evaluation. Outside of constant evaluation those new member functions
just forward to the existing implementation in the base class.

	PR c++/91369 Implement P0784R7 changes to allocation and construction
	* include/bits/alloc_traits.h: Include <bits/stl_construct.h>.
	(allocator_traits::_S_allocate, allocator_traits::_S_construct)
	(allocator_traits::_S_destroy, allocator_traits::_S_max_size)
	(allocator_traits::_S_select, allocator_traits::allocate)
	(allocator_traits::deallocate, allocator_traits::construct)
	(allocator_traits::destroy, allocator_traits::max_size)
	(allocator_traits::select_on_container_copy_construction)
	(allocator_traits<allocator<T>>): Add constexpr specifier for C++20.
	(allocator_traits<allocator<T>>::construct): Use construct_at.
	(allocator_traits<allocator<T>>::destroy): Use destroy_at.
	(__alloc_on_copy, __alloc_on_move, __alloc_on_swap): Add constexpr
	specifier.
	(_Destroy(ForwardIterator, ForwardIterator, Alloc&))
	(_Destroy(ForwardIterator, ForwardIterator, allocator<T>&)): Move here
	from <bits/stl_construct.h>.
	* include/bits/allocator.h (allocator::~allocator): Remove for C++20.
	(allocator::allocate, allocate::deallocate): Define for C++20 and up.
	(operator==, operator!=): Add constexpr specifier for C++20.
	* include/bits/stl_construct.h: Don't include <ext/alloc_traits.h>.
	(destroy_at): For C++20 add constexpr specifier and support for
	destroying arrays.
	(construct_at): Define new function for C++20.
	(_Construct): Return result of placement new-expression. For C++11 and
	up add constexpr. For C++20 dispatch to std::construct_at during
	constant evaluation.
	(_Destroy(pointer)): Add constexpr specifier. For C++20 dispatch to
	std::destroy_at during constant evaluation.
	(_Destroy_aux::__destroy, _Destroy_n_aux::__destroy_n): Add constexpr
	specifier for C++20.
	(_Destroy(ForwardIterator, ForwardIterator))
	(_Destroy(ForwardIterator, Size)): Likewise. Do not elide trivial
	destructors during constant evaluation.
	(destroy, destroy_n): Add constexpr specifier for C++20.
	(_Destroy(ForwardIterator, ForwardIterator, Alloc&))
	(_Destroy(ForwardIterator, ForwardIterator, allocator<T>&)): Move to
	<bits/alloc_traits.h>, to remove dependency on allocators.
	* include/bits/stl_uninitialized.h: Include <ext/alloc_traits.h>.
	Include <bits/stl_pair.h> instead of <utility>.
	* include/ext/alloc_traits.h: Always include <bits/alloc_traits.h>.
	(__alloc_traits::construct, __alloc_traits::destroy)
	(__alloc_traits::_S_select_on_copy, __alloc_traits::_S_on_swap): Add
	constexpr specifier.
	* include/ext/malloc_allocator.h  (operator==, operator!=): Add
	constexpr specifier for C++20.
	* include/ext/new_allocator.h (operator==, operator!=): Likewise.
	* testsuite/20_util/headers/memory/synopsis.cc: Add constexpr.
	* testsuite/20_util/scoped_allocator/69293_neg.cc: Ignore additional
	errors due to constexpr function called after failed static_assert.
	* testsuite/20_util/specialized_algorithms/construct_at/1.cc: New test.
	* testsuite/23_containers/vector/cons/destructible_debug_neg.cc:
	Ignore additional errors due to constexpr function called after failed
	static_assert.
	* testsuite/23_containers/vector/cons/destructible_neg.cc: Likewise.

From-SVN: r277342
This commit is contained in:
Jonathan Wakely 2019-10-23 18:42:11 +01:00 • committed by Jonathan Wakely
parent 0744333e5a
commit 85f2411493
13 changed files with 343 additions and 111 deletions
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55
libstdc++-v3/ChangeLog
View file

@ -1,5 +1,60 @@
2019-10-23 Jonathan Wakely <jwakely@redhat.com>
PR c++/91369 Implement P0784R7 changes to allocation and construction
* include/bits/alloc_traits.h: Include <bits/stl_construct.h>.
(allocator_traits::_S_allocate, allocator_traits::_S_construct)
(allocator_traits::_S_destroy, allocator_traits::_S_max_size)
(allocator_traits::_S_select, allocator_traits::allocate)
(allocator_traits::deallocate, allocator_traits::construct)
(allocator_traits::destroy, allocator_traits::max_size)
(allocator_traits::select_on_container_copy_construction)
(allocator_traits<allocator<T>>): Add constexpr specifier for C++20.
(allocator_traits<allocator<T>>::construct): Use construct_at.
(allocator_traits<allocator<T>>::destroy): Use destroy_at.
(__alloc_on_copy, __alloc_on_move, __alloc_on_swap): Add constexpr
specifier.
(_Destroy(ForwardIterator, ForwardIterator, Alloc&))
(_Destroy(ForwardIterator, ForwardIterator, allocator<T>&)): Move here
from <bits/stl_construct.h>.
* include/bits/allocator.h (allocator::~allocator): Remove for C++20.
(allocator::allocate, allocate::deallocate): Define for C++20 and up.
(operator==, operator!=): Add constexpr specifier for C++20.
* include/bits/stl_construct.h: Don't include <ext/alloc_traits.h>.
(destroy_at): For C++20 add constexpr specifier and support for
destroying arrays.
(construct_at): Define new function for C++20.
(_Construct): Return result of placement new-expression. For C++11 and
up add constexpr. For C++20 dispatch to std::construct_at during
constant evaluation.
(_Destroy(pointer)): Add constexpr specifier. For C++20 dispatch to
std::destroy_at during constant evaluation.
(_Destroy_aux::__destroy, _Destroy_n_aux::__destroy_n): Add constexpr
specifier for C++20.
(_Destroy(ForwardIterator, ForwardIterator))
(_Destroy(ForwardIterator, Size)): Likewise. Do not elide trivial
destructors during constant evaluation.
(destroy, destroy_n): Add constexpr specifier for C++20.
(_Destroy(ForwardIterator, ForwardIterator, Alloc&))
(_Destroy(ForwardIterator, ForwardIterator, allocator<T>&)): Move to
<bits/alloc_traits.h>, to remove dependency on allocators.
* include/bits/stl_uninitialized.h: Include <ext/alloc_traits.h>.
Include <bits/stl_pair.h> instead of <utility>.
* include/ext/alloc_traits.h: Always include <bits/alloc_traits.h>.
(__alloc_traits::construct, __alloc_traits::destroy)
(__alloc_traits::_S_select_on_copy, __alloc_traits::_S_on_swap): Add
constexpr specifier.
* include/ext/malloc_allocator.h (operator==, operator!=): Add
constexpr specifier for C++20.
* include/ext/new_allocator.h (operator==, operator!=): Likewise.
* testsuite/20_util/headers/memory/synopsis.cc: Add constexpr.
* testsuite/20_util/scoped_allocator/69293_neg.cc: Ignore additional
errors due to constexpr function called after failed static_assert.
* testsuite/20_util/specialized_algorithms/construct_at/1.cc: New test.
* testsuite/23_containers/vector/cons/destructible_debug_neg.cc:
Ignore additional errors due to constexpr function called after failed
static_assert.
* testsuite/23_containers/vector/cons/destructible_neg.cc: Likewise.
* testsuite/20_util/bind/91371.cc: Fix test to compile as C++11.
* include/debug/helper_functions.h (__valid_range): Change

125
libstdc++-v3/include/bits/alloc_traits.h
View file

@ -30,18 +30,21 @@
#ifndef _ALLOC_TRAITS_H
#define _ALLOC_TRAITS_H 1
#if __cplusplus >= 201103L
#include <bits/stl_construct.h>
#include <bits/memoryfwd.h>
#include <bits/ptr_traits.h>
#include <ext/numeric_traits.h>
#define __cpp_lib_allocator_traits_is_always_equal 201411
#if __cplusplus >= 201103L
# include <bits/allocator.h>
# include <bits/ptr_traits.h>
# include <ext/numeric_traits.h>
#endif
namespace std _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION
#if __cplusplus >= 201103L
#define __cpp_lib_allocator_traits_is_always_equal 201411
struct __allocator_traits_base
{
template<typename _Tp, typename _Up, typename = void>
@ -209,13 +212,13 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
private:
template<typename _Alloc2>
static auto
static constexpr auto
_S_allocate(_Alloc2& __a, size_type __n, const_void_pointer __hint, int)
-> decltype(__a.allocate(__n, __hint))
{ return __a.allocate(__n, __hint); }
template<typename _Alloc2>
static pointer
static constexpr pointer
_S_allocate(_Alloc2& __a, size_type __n, const_void_pointer, ...)
{ return __a.allocate(__n); }
@ -238,41 +241,41 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
= typename __construct_helper<_Tp, _Args...>::type;
template<typename _Tp, typename... _Args>
static _Require<__has_construct<_Tp, _Args...>>
static constexpr _Require<__has_construct<_Tp, _Args...>>
_S_construct(_Alloc& __a, _Tp* __p, _Args&&... __args)
noexcept(noexcept(__a.construct(__p, std::forward<_Args>(__args)...)))
{ __a.construct(__p, std::forward<_Args>(__args)...); }
template<typename _Tp, typename... _Args>
static
static constexpr
_Require<__and_<__not_<__has_construct<_Tp, _Args...>>,
is_constructible<_Tp, _Args...>>>
_S_construct(_Alloc&, _Tp* __p, _Args&&... __args)
noexcept(noexcept(::new((void*)__p)
_Tp(std::forward<_Args>(__args)...)))
{ ::new((void*)__p) _Tp(std::forward<_Args>(__args)...); }
{ std::_Construct(__p, std::forward<_Args>(__args)...); }
template<typename _Alloc2, typename _Tp>
static auto
static constexpr auto
_S_destroy(_Alloc2& __a, _Tp* __p, int)
noexcept(noexcept(__a.destroy(__p)))
-> decltype(__a.destroy(__p))
{ __a.destroy(__p); }
template<typename _Alloc2, typename _Tp>
static void
static constexpr void
_S_destroy(_Alloc2&, _Tp* __p, ...)
noexcept(noexcept(__p->~_Tp()))
{ __p->~_Tp(); }
{ std::_Destroy(__p); }
template<typename _Alloc2>
static auto
static constexpr auto
_S_max_size(_Alloc2& __a, int)
-> decltype(__a.max_size())
{ return __a.max_size(); }
template<typename _Alloc2>
static size_type
static constexpr size_type
_S_max_size(_Alloc2&, ...)
{
// _GLIBCXX_RESOLVE_LIB_DEFECTS
@ -282,13 +285,13 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
}
template<typename _Alloc2>
static auto
static constexpr auto
_S_select(_Alloc2& __a, int)
-> decltype(__a.select_on_container_copy_construction())
{ return __a.select_on_container_copy_construction(); }
template<typename _Alloc2>
static _Alloc2
static constexpr _Alloc2
_S_select(_Alloc2& __a, ...)
{ return __a; }
@ -301,7 +304,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
*
* Calls @c a.allocate(n)
*/
_GLIBCXX_NODISCARD static pointer
_GLIBCXX_NODISCARD static _GLIBCXX20_CONSTEXPR pointer
allocate(_Alloc& __a, size_type __n)
{ return __a.allocate(__n); }
@ -316,7 +319,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
* Returns <tt> a.allocate(n, hint) </tt> if that expression is
* well-formed, otherwise returns @c a.allocate(n)
*/
_GLIBCXX_NODISCARD static pointer
_GLIBCXX_NODISCARD static _GLIBCXX20_CONSTEXPR pointer
allocate(_Alloc& __a, size_type __n, const_void_pointer __hint)
{ return _S_allocate(__a, __n, __hint, 0); }
@ -328,7 +331,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
*
* Calls <tt> a.deallocate(p, n) </tt>
*/
static void
static _GLIBCXX20_CONSTEXPR void
deallocate(_Alloc& __a, pointer __p, size_type __n)
{ __a.deallocate(__p, __n); }
@ -344,7 +347,8 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
* arguments @a __args...
*/
template<typename _Tp, typename... _Args>
static auto construct(_Alloc& __a, _Tp* __p, _Args&&... __args)
static _GLIBCXX20_CONSTEXPR auto
construct(_Alloc& __a, _Tp* __p, _Args&&... __args)
noexcept(noexcept(_S_construct(__a, __p,
std::forward<_Args>(__args)...)))
-> decltype(_S_construct(__a, __p, std::forward<_Args>(__args)...))
@ -359,7 +363,8 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
* otherwise calls @c __p->~_Tp()
*/
template<typename _Tp>
static void destroy(_Alloc& __a, _Tp* __p)
static _GLIBCXX20_CONSTEXPR void
destroy(_Alloc& __a, _Tp* __p)
noexcept(noexcept(_S_destroy(__a, __p, 0)))
{ _S_destroy(__a, __p, 0); }
@ -371,7 +376,8 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
* Returns @c __a.max_size() if that expression is well-formed,
* otherwise returns @c numeric_limits<size_type>::max()
*/
static size_type max_size(const _Alloc& __a) noexcept
static _GLIBCXX20_CONSTEXPR size_type
max_size(const _Alloc& __a) noexcept
{ return _S_max_size(__a, 0); }
/**
@ -382,7 +388,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
* Returns @c __rhs.select_on_container_copy_construction() if that
* expression is well-formed, otherwise returns @a __rhs
*/
static _Alloc
static _GLIBCXX20_CONSTEXPR _Alloc
select_on_container_copy_construction(const _Alloc& __rhs)
{ return _S_select(__rhs, 0); }
};
@ -440,7 +446,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
*
* Calls @c a.allocate(n)
*/
_GLIBCXX_NODISCARD static pointer
_GLIBCXX_NODISCARD static _GLIBCXX20_CONSTEXPR pointer
allocate(allocator_type& __a, size_type __n)
{ return __a.allocate(__n); }
@ -454,7 +460,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
*
* Returns <tt> a.allocate(n, hint) </tt>
*/
_GLIBCXX_NODISCARD static pointer
_GLIBCXX_NODISCARD static _GLIBCXX20_CONSTEXPR pointer
allocate(allocator_type& __a, size_type __n, const_void_pointer __hint)
{
#if __cplusplus <= 201703L
@ -472,27 +478,30 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
*
* Calls <tt> a.deallocate(p, n) </tt>
*/
static void
static _GLIBCXX20_CONSTEXPR void
deallocate(allocator_type& __a, pointer __p, size_type __n)
{ __a.deallocate(__p, __n); }
/**
* @brief Construct an object of type @a _Up
* @brief Construct an object of type `_Up`
* @param __a An allocator.
* @param __p Pointer to memory of suitable size and alignment for Tp
* @param __p Pointer to memory of suitable size and alignment for
* an object of type `_Up`.
* @param __args Constructor arguments.
*
* Calls <tt> __a.construct(__p, std::forward<Args>(__args)...) </tt>
* Calls `__a.construct(__p, std::forward<_Args>(__args)...)`
* in C++11, C++14 and C++17. Changed in C++20 to call
* `std::construct_at(__p, std::forward<_Args>(__args)...)` instead.
*/
template<typename _Up, typename... _Args>
static void
static _GLIBCXX20_CONSTEXPR void
construct(allocator_type& __a, _Up* __p, _Args&&... __args)
noexcept(noexcept(::new((void*)__p) _Up(std::forward<_Args>(__args)...)))
{
#if __cplusplus <= 201703L
__a.construct(__p, std::forward<_Args>(__args)...);
#else
::new((void*)__p) _Up(std::forward<_Args>(__args)...);
std::construct_at(__p, std::forward<_Args>(__args)...);
#endif
}
@ -504,14 +513,14 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
* Calls @c __a.destroy(__p).
*/
template<typename _Up>
static void
static _GLIBCXX20_CONSTEXPR void
destroy(allocator_type& __a, _Up* __p)
noexcept(is_nothrow_destructible<_Up>::value)
{
#if __cplusplus <= 201703L
__a.destroy(__p);
#else
__p->~_Up();
std::destroy_at(__p);
#endif
}
@ -520,7 +529,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
* @param __a An allocator.
* @return @c __a.max_size()
*/
static size_type
static _GLIBCXX20_CONSTEXPR size_type
max_size(const allocator_type& __a) noexcept
{
#if __cplusplus <= 201703L
@ -535,7 +544,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
* @param __rhs An allocator.
* @return @c __rhs
*/
static allocator_type
static _GLIBCXX20_CONSTEXPR allocator_type
select_on_container_copy_construction(const allocator_type& __rhs)
{ return __rhs; }
};
@ -553,7 +562,8 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
#endif
template<typename _Alloc>
inline void __alloc_on_copy(_Alloc& __one, const _Alloc& __two)
constexpr void
__alloc_on_copy(_Alloc& __one, const _Alloc& __two)
{
typedef allocator_traits<_Alloc> __traits;
typedef typename __traits::propagate_on_container_copy_assignment __pocca;
@ -566,7 +576,8 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
}
template<typename _Alloc>
inline _Alloc __alloc_on_copy(const _Alloc& __a)
constexpr _Alloc
__alloc_on_copy(const _Alloc& __a)
{
typedef allocator_traits<_Alloc> __traits;
return __traits::select_on_container_copy_construction(__a);
@ -583,7 +594,8 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
#endif
template<typename _Alloc>
inline void __alloc_on_move(_Alloc& __one, _Alloc& __two)
constexpr void
__alloc_on_move(_Alloc& __one, _Alloc& __two)
{
typedef allocator_traits<_Alloc> __traits;
typedef typename __traits::propagate_on_container_move_assignment __pocma;
@ -609,7 +621,8 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
#endif
template<typename _Alloc>
inline void __alloc_on_swap(_Alloc& __one, _Alloc& __two)
constexpr void
__alloc_on_swap(_Alloc& __one, _Alloc& __two)
{
typedef allocator_traits<_Alloc> __traits;
typedef typename __traits::propagate_on_container_swap __pocs;
@ -685,8 +698,36 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
template<typename _Alloc>
using _RequireNotAllocator
= typename enable_if<!__is_allocator<_Alloc>::value, _Alloc>::type;
#endif // C++11
/**
* Destroy a range of objects using the supplied allocator. For
* non-default allocators we do not optimize away invocation of
* destroy() even if _Tp has a trivial destructor.
*/
template<typename _ForwardIterator, typename _Allocator>
void
_Destroy(_ForwardIterator __first, _ForwardIterator __last,
_Allocator& __alloc)
{
for (; __first != __last; ++__first)
#if __cplusplus < 201103L
__alloc.destroy(std::__addressof(*__first));
#else
allocator_traits<_Allocator>::destroy(__alloc,
std::__addressof(*__first));
#endif
}
template<typename _ForwardIterator, typename _Tp>
inline void
_Destroy(_ForwardIterator __first, _ForwardIterator __last,
allocator<_Tp>&)
{
_Destroy(__first, __last);
}
_GLIBCXX_END_NAMESPACE_VERSION
} // namespace std
#endif // C++11
#endif // _ALLOC_TRAITS_H

37
libstdc++-v3/include/bits/allocator.h
View file

@ -154,13 +154,42 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
_GLIBCXX20_CONSTEXPR
allocator(const allocator<_Tp1>&) _GLIBCXX_NOTHROW { }
#if __cplusplus <= 201703L
~allocator() _GLIBCXX_NOTHROW { }
#endif
friend bool
#if __cplusplus > 201703L
[[nodiscard,__gnu__::__always_inline__]]
constexpr _Tp*
allocate(size_t __n)
{
#ifdef __cpp_lib_is_constant_evaluated
if (std::is_constant_evaluated())
return static_cast<_Tp*>(::operator new(__n * sizeof(_Tp)));
#endif
return __allocator_base<_Tp>::allocate(__n, 0);
}
[[__gnu__::__always_inline__]]
constexpr void
deallocate(_Tp* __p, size_t __n)
{
#ifdef __cpp_lib_is_constant_evaluated
if (std::is_constant_evaluated())
{
::operator delete(__p);
return;
}
#endif
__allocator_base<_Tp>::deallocate(__p, __n);
}
#endif // C++20
friend _GLIBCXX20_CONSTEXPR bool
operator==(const allocator&, const allocator&) _GLIBCXX_NOTHROW
{ return true; }
friend bool
friend _GLIBCXX20_CONSTEXPR bool
operator!=(const allocator&, const allocator&) _GLIBCXX_NOTHROW
{ return false; }
@ -168,13 +197,13 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
};
template<typename _T1, typename _T2>
inline bool
inline _GLIBCXX20_CONSTEXPR bool
operator==(const allocator<_T1>&, const allocator<_T2>&)
_GLIBCXX_NOTHROW
{ return true; }
template<typename _T1, typename _T2>
inline bool
inline _GLIBCXX20_CONSTEXPR bool
operator!=(const allocator<_T1>&, const allocator<_T2>&)
_GLIBCXX_NOTHROW
{ return false; }

128
libstdc++-v3/include/bits/stl_construct.h
View file

@ -58,29 +58,69 @@
#include <new>
#include <bits/move.h>
#include <ext/alloc_traits.h>
#include <bits/stl_iterator_base_types.h> // for iterator_traits
#include <bits/stl_iterator_base_funcs.h> // for advance
/* This file provides the C++17 functions std::destroy_at, std::destroy, and
* std::destroy_n, and the C++20 function std::construct_at.
* It also provides std::_Construct, std::_Destroy,and std::_Destroy_n functions
* which are defined in all standard modes and so can be used in C++98-14 code.
* The _Construct and _Destroy functions will dispatch to construct_at and
* destroy_at during constant evaluation, because calls to those functions are
* intercepted by the compiler to allow use in constant expressions.
*/
namespace std _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION
#if __cplusplus >= 201703L
template <typename _Tp>
_GLIBCXX20_CONSTEXPR inline void
destroy_at(_Tp* __location)
{
if constexpr (__cplusplus > 201703L && is_array_v<_Tp>)
{
for (auto& __x : *__location)
std::destroy_at(std::__addressof(__x));
}
else
__location->~_Tp();
}
#if __cplusplus > 201703L
template<typename _Tp, typename... _Args>
constexpr auto
construct_at(_Tp* __location, _Args&&... __args)
noexcept(noexcept(::new((void*)0) _Tp(std::declval<_Args>()...)))
-> decltype(::new((void*)0) _Tp(std::declval<_Args>()...))
{ return ::new((void*)__location) _Tp(std::forward<_Args>(__args)...); }
#endif // C++20
#endif// C++17
/**
* Constructs an object in existing memory by invoking an allocated
* object's constructor with an initializer.
*/
#if __cplusplus >= 201103L
template<typename _T1, typename... _Args>
inline void
_Construct(_T1* __p, _Args&&... __args)
{ ::new(static_cast<void*>(__p)) _T1(std::forward<_Args>(__args)...); }
template<typename _Tp, typename... _Args>
constexpr _Tp*
_Construct(_Tp* __p, _Args&&... __args)
{
#if __cplusplus > 201703L
return std::construct_at(__p, std::forward<_Args>(__args)...);
#else
return ::new(static_cast<void*>(__p)) _Tp(std::forward<_Args>(__args)...);
#endif
}
#else
template<typename _T1, typename _T2>
inline void
inline _T1*
_Construct(_T1* __p, const _T2& __value)
{
// _GLIBCXX_RESOLVE_LIB_DEFECTS
// 402. wrong new expression in [some_]allocator::construct
::new(static_cast<void*>(__p)) _T1(__value);
return ::new(static_cast<void*>(__p)) _T1(__value);
}
#endif
@ -89,20 +129,30 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
_Construct_novalue(_T1* __p)
{ ::new(static_cast<void*>(__p)) _T1; }
template<typename _ForwardIterator>
_GLIBCXX20_CONSTEXPR void
_Destroy(_ForwardIterator __first, _ForwardIterator __last);
/**
* Destroy the object pointed to by a pointer type.
*/
template<typename _Tp>
inline void
_GLIBCXX_CONSTEXPR inline void
_Destroy(_Tp* __pointer)
{ __pointer->~_Tp(); }
{
#if __cplusplus > 201703L
std::destroy_at(__pointer);
#else
__pointer->~_Tp();
#endif
}
template<bool>
struct _Destroy_aux
{
template<typename _ForwardIterator>
static void
__destroy(_ForwardIterator __first, _ForwardIterator __last)
static _GLIBCXX20_CONSTEXPR void
__destroy(_ForwardIterator __first, _ForwardIterator __last)
{
for (; __first != __last; ++__first)
std::_Destroy(std::__addressof(*__first));
@ -123,7 +173,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
* away, otherwise the objects' destructors must be invoked.
*/
template<typename _ForwardIterator>
inline void
_GLIBCXX20_CONSTEXPR inline void
_Destroy(_ForwardIterator __first, _ForwardIterator __last)
{
typedef typename iterator_traits<_ForwardIterator>::value_type
@ -132,6 +182,10 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
// A deleted destructor is trivial, this ensures we reject such types:
static_assert(is_destructible<_Value_type>::value,
"value type is destructible");
#endif
#if __cplusplus > 201703L && defined __cpp_lib_is_constant_evaluated
if (std::is_constant_evaluated())
return _Destroy_aux<false>::__destroy(__first, __last);
#endif
std::_Destroy_aux<__has_trivial_destructor(_Value_type)>::
__destroy(__first, __last);
@ -141,8 +195,8 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
struct _Destroy_n_aux
{
template<typename _ForwardIterator, typename _Size>
static _ForwardIterator
__destroy_n(_ForwardIterator __first, _Size __count)
static _GLIBCXX20_CONSTEXPR _ForwardIterator
__destroy_n(_ForwardIterator __first, _Size __count)
{
for (; __count > 0; (void)++__first, --__count)
std::_Destroy(std::__addressof(*__first));
@ -168,7 +222,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
* away, otherwise the objects' destructors must be invoked.
*/
template<typename _ForwardIterator, typename _Size>
inline _ForwardIterator
_GLIBCXX20_CONSTEXPR inline _ForwardIterator
_Destroy_n(_ForwardIterator __first, _Size __count)
{
typedef typename iterator_traits<_ForwardIterator>::value_type
@ -177,60 +231,32 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
// A deleted destructor is trivial, this ensures we reject such types:
static_assert(is_destructible<_Value_type>::value,
"value type is destructible");
#endif
#if __cplusplus > 201703L && defined __cpp_lib_is_constant_evaluated
if (std::is_constant_evaluated())
return _Destroy_n_aux<false>::__destroy_n(__first, __count);
#endif
return std::_Destroy_n_aux<__has_trivial_destructor(_Value_type)>::
__destroy_n(__first, __count);
}
/**
* Destroy a range of objects using the supplied allocator. For
* nondefault allocators we do not optimize away invocation of
* destroy() even if _Tp has a trivial destructor.
*/
template<typename _ForwardIterator, typename _Allocator>
void
_Destroy(_ForwardIterator __first, _ForwardIterator __last,
_Allocator& __alloc)
{
typedef __gnu_cxx::__alloc_traits<_Allocator> __traits;
for (; __first != __last; ++__first)
__traits::destroy(__alloc, std::__addressof(*__first));
}
template<typename _ForwardIterator, typename _Tp>
inline void
_Destroy(_ForwardIterator __first, _ForwardIterator __last,
allocator<_Tp>&)
{
_Destroy(__first, __last);
}
#if __cplusplus > 201402L
template <typename _Tp>
inline void
destroy_at(_Tp* __location)
{
std::_Destroy(__location);
}
#if __cplusplus >= 201703L
template <typename _ForwardIterator>
inline void
_GLIBCXX20_CONSTEXPR inline void
destroy(_ForwardIterator __first, _ForwardIterator __last)
{
std::_Destroy(__first, __last);
}
template <typename _ForwardIterator, typename _Size>
inline _ForwardIterator
_GLIBCXX20_CONSTEXPR inline _ForwardIterator
destroy_n(_ForwardIterator __first, _Size __count)
{
return std::_Destroy_n(__first, __count);
}
#endif
#endif // C++17
_GLIBCXX_END_NAMESPACE_VERSION
} // namespace std
#endif /* _STL_CONSTRUCT_H */

4
libstdc++-v3/include/bits/stl_uninitialized.h
View file

@ -57,13 +57,15 @@
#define _STL_UNINITIALIZED_H 1
#if __cplusplus > 201402L
#include <utility>
#include <bits/stl_pair.h>
#endif
#if __cplusplus >= 201103L
#include <type_traits>
#endif
#include <ext/alloc_traits.h>
namespace std _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION

16
libstdc++-v3/include/ext/alloc_traits.h
View file

@ -31,10 +31,8 @@
#pragma GCC system_header
#if __cplusplus >= 201103L
# include <bits/move.h>
# include <bits/alloc_traits.h>
#else
#if __cplusplus < 201103L
# include <bits/allocator.h> // for __alloc_swap
#endif
@ -78,7 +76,7 @@ template<typename _Alloc, typename = typename _Alloc::value_type>
public:
// overload construct for non-standard pointer types
template<typename _Ptr, typename... _Args>
static typename std::enable_if<__is_custom_pointer<_Ptr>::value>::type
static constexpr std::__enable_if_t<__is_custom_pointer<_Ptr>::value>
construct(_Alloc& __a, _Ptr __p, _Args&&... __args)
noexcept(noexcept(_Base_type::construct(__a, std::__to_address(__p),
std::forward<_Args>(__args)...)))
@ -89,15 +87,15 @@ template<typename _Alloc, typename = typename _Alloc::value_type>
// overload destroy for non-standard pointer types
template<typename _Ptr>
static typename std::enable_if<__is_custom_pointer<_Ptr>::value>::type
static constexpr std::__enable_if_t<__is_custom_pointer<_Ptr>::value>
destroy(_Alloc& __a, _Ptr __p)
noexcept(noexcept(_Base_type::destroy(__a, std::__to_address(__p))))
{ _Base_type::destroy(__a, std::__to_address(__p)); }
static _Alloc _S_select_on_copy(const _Alloc& __a)
static constexpr _Alloc _S_select_on_copy(const _Alloc& __a)
{ return _Base_type::select_on_container_copy_construction(__a); }
static void _S_on_swap(_Alloc& __a, _Alloc& __b)
static constexpr void _S_on_swap(_Alloc& __a, _Alloc& __b)
{ std::__alloc_on_swap(__a, __b); }
static constexpr bool _S_propagate_on_copy_assign()
@ -118,7 +116,7 @@ template<typename _Alloc, typename = typename _Alloc::value_type>
template<typename _Tp>
struct rebind
{ typedef typename _Base_type::template rebind_alloc<_Tp> other; };
#else
#else // ! C++11
typedef typename _Alloc::pointer pointer;
typedef typename _Alloc::const_pointer const_pointer;
@ -162,7 +160,7 @@ template<typename _Alloc, typename = typename _Alloc::value_type>
template<typename _Tp>
struct rebind
{ typedef typename _Alloc::template rebind<_Tp>::other other; };
#endif
#endif // C++11
};
_GLIBCXX_END_NAMESPACE_VERSION

4
libstdc++-v3/include/ext/malloc_allocator.h
View file

@ -169,13 +169,13 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
#endif // ! C++20
template<typename _Up>
friend bool
friend _GLIBCXX20_CONSTEXPR bool
operator==(const malloc_allocator&, const malloc_allocator<_Up>&)
_GLIBCXX_NOTHROW
{ return true; }
template<typename _Up>
friend bool
friend _GLIBCXX20_CONSTEXPR bool
operator!=(const malloc_allocator&, const malloc_allocator<_Up>&)
_GLIBCXX_NOTHROW
{ return false; }

4
libstdc++-v3/include/ext/new_allocator.h
View file

@ -168,13 +168,13 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
#endif // ! C++20
template<typename _Up>
friend bool
friend _GLIBCXX20_CONSTEXPR bool
operator==(const new_allocator&, const new_allocator<_Up>&)
_GLIBCXX_NOTHROW
{ return true; }
template<typename _Up>
friend bool
friend _GLIBCXX20_CONSTEXPR bool
operator!=(const new_allocator&, const new_allocator<_Up>&)
_GLIBCXX_NOTHROW
{ return false; }

6
libstdc++-v3/testsuite/20_util/headers/memory/synopsis.cc
View file

@ -25,8 +25,14 @@ namespace std {
template <class T> class allocator;
template <> class allocator<void>;
template <class T, class U>
#if __cplusplus > 201703L
constexpr
#endif
bool operator==(const allocator<T>&, const allocator<U>&) throw();
template <class T, class U>
#if __cplusplus > 201703L
constexpr
#endif
bool operator!=(const allocator<T>&, const allocator<U>&) throw();
// lib.storage.iterator, raw storage iterator:

3
libstdc++-v3/testsuite/20_util/scoped_allocator/69293_neg.cc
View file

@ -48,3 +48,6 @@ test01()
sa.construct(p); // this is required to be ill-formed
// { dg-error "failed: .* uses_allocator is true" "" { target *-*-* } 0 }
}
// Needed because of PR c++/92193
// { dg-prune-output "no matching function for call to" }

64
libstdc++-v3/testsuite/20_util/specialized_algorithms/construct_at/1.cc Normal file
View file

@ -0,0 +1,64 @@
// Copyright (C) 2019 Free Software Foundation, Inc.
//
// 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.
// You should have received a copy of the GNU General Public License along
// with this library; see the file COPYING3. If not see
// <http://www.gnu.org/licenses/>.
// { dg-options "-std=gnu++2a" }
// { dg-do run { target c++2a } }
#include <memory>
#include <testsuite_hooks.h>
template<typename T, typename... Args>
concept can_construct_at = requires(T* p, Args&&... args)
{
p = std::construct_at(p, std::forward<Args>(args)...);
};
static_assert( can_construct_at<int> );
static_assert( can_construct_at<int, int> );
static_assert( !can_construct_at<int, int, int> );
// Not required by C++20:
static_assert( noexcept(std::construct_at(std::declval<int*>(), 1)) );
void
test01()
{
int i = -1;
auto p = std::construct_at(&i);
VERIFY( p == &i );
VERIFY( i == 0 );
p = std::construct_at(&i, 42);
VERIFY( p == &i );
VERIFY( i == 42 );
}
struct X {
X(char&, void*) { }
};
static_assert( can_construct_at<X, char&, void*> );
static_assert( !can_construct_at<X> );
static_assert( !can_construct_at<X, char> );
static_assert( !can_construct_at<X, char&, const void*> );
static_assert( !noexcept(std::construct_at(std::declval<X*>(), std::declval<char&>(), std::declval<void*>())) );
int
main()
{
test01();
}

4
libstdc++-v3/testsuite/23_containers/vector/cons/destructible_debug_neg.cc
View file

@ -47,3 +47,7 @@ test02()
// In Debug Mode the "required from here" errors come from <debug/vector>
// { dg-error "required from here" "" { target *-*-* } 163 }
// Needed because of PR c++/92193
// { dg-prune-output "deleted function" }
// { dg-prune-output "private within this context" }

4
libstdc++-v3/testsuite/23_containers/vector/cons/destructible_neg.cc
View file

@ -43,3 +43,7 @@ test02()
}
// { dg-error "value type is destructible" "" { target *-*-* } 0 }
// Needed because of PR c++/92193
// { dg-prune-output "deleted function" }
// { dg-prune-output "private within this context" }