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438e2ccd4a
Implementing `constexpr std::stable_sort`. This is part of P2562R1, tracked via issue #105360. Closes #119394 Co-authored-by: A. Jiang <de34@live.cn> Co-authored-by: Louis Dionne <ldionne.2@gmail.com>
64 lines
2.2 KiB
C++
64 lines
2.2 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef _LIBCPP___MEMORY_DESTRUCT_N_H
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#define _LIBCPP___MEMORY_DESTRUCT_N_H
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#include <__config>
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#include <__cstddef/size_t.h>
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#include <__type_traits/integral_constant.h>
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#include <__type_traits/is_trivially_destructible.h>
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#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
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# pragma GCC system_header
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#endif
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_LIBCPP_BEGIN_NAMESPACE_STD
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struct __destruct_n {
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private:
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size_t __size_;
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template <class _Tp>
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_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX26 void __process(_Tp* __p, false_type) _NOEXCEPT {
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for (size_t __i = 0; __i < __size_; ++__i, ++__p)
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__p->~_Tp();
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}
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template <class _Tp>
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_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX26 void __process(_Tp*, true_type) _NOEXCEPT {}
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_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX26 void __incr(false_type) _NOEXCEPT { ++__size_; }
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_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX26 void __incr(true_type) _NOEXCEPT {}
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_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX26 void __set(size_t __s, false_type) _NOEXCEPT { __size_ = __s; }
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_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX26 void __set(size_t, true_type) _NOEXCEPT {}
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public:
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_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX26 explicit __destruct_n(size_t __s) _NOEXCEPT : __size_(__s) {}
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template <class _Tp>
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_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX26 void __incr() _NOEXCEPT {
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__incr(integral_constant<bool, is_trivially_destructible<_Tp>::value>());
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}
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template <class _Tp>
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_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX26 void __set(size_t __s, _Tp*) _NOEXCEPT {
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__set(__s, integral_constant<bool, is_trivially_destructible<_Tp>::value>());
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}
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template <class _Tp>
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_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX26 void operator()(_Tp* __p) _NOEXCEPT {
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__process(__p, integral_constant<bool, is_trivially_destructible<_Tp>::value>());
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}
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};
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_LIBCPP_END_NAMESPACE_STD
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#endif // _LIBCPP___MEMORY_DESTRUCT_N_H
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