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80643d9366
We plan to add concepts for checking that iterators actually provide what they claim to. This is to avoid people thinking that these type traits actually check the iterator requirements in more detail. Reviewed By: ldionne, #libc Spies: Mordante, libcxx-commits, wenlei Differential Revision: https://reviews.llvm.org/D150801
58 lines
2.1 KiB
C++
58 lines
2.1 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___ALGORITHM_PSTL_COPY_H
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#define _LIBCPP___ALGORITHM_PSTL_COPY_H
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#include <__algorithm/copy_n.h>
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#include <__algorithm/pstl_transform.h>
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#include <__config>
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#include <__functional/identity.h>
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#include <__iterator/iterator_traits.h>
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#include <__type_traits/is_constant_evaluated.h>
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#include <__type_traits/is_execution_policy.h>
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#include <__type_traits/is_trivially_copyable.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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#if !defined(_LIBCPP_HAS_NO_INCOMPLETE_PSTL) && _LIBCPP_STD_VER >= 17
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_LIBCPP_BEGIN_NAMESPACE_STD
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// TODO: Use the std::copy/move shenanigans to forward to std::memmove
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template <class _ExecutionPolicy,
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class _ForwardIterator,
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class _ForwardOutIterator,
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enable_if_t<is_execution_policy_v<__remove_cvref_t<_ExecutionPolicy>>, int> = 0>
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_LIBCPP_HIDE_FROM_ABI _ForwardOutIterator
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copy(_ExecutionPolicy&& __policy, _ForwardIterator __first, _ForwardIterator __last, _ForwardOutIterator __result) {
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return std::transform(__policy, __first, __last, __result, __identity());
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}
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template <class _ExecutionPolicy,
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class _ForwardIterator,
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class _ForwardOutIterator,
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class _Size,
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enable_if_t<is_execution_policy_v<__remove_cvref_t<_ExecutionPolicy>>, int> = 0>
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_LIBCPP_HIDE_FROM_ABI _ForwardOutIterator
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copy_n(_ExecutionPolicy&& __policy, _ForwardIterator __first, _Size __n, _ForwardOutIterator __result) {
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if constexpr (__has_random_access_iterator_category<_ForwardIterator>::value)
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return std::copy(__policy, __first, __first + __n, __result);
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else
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return std::copy_n(__first, __n, __result);
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}
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_LIBCPP_END_NAMESPACE_STD
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#endif // !defined(_LIBCPP_HAS_NO_INCOMPLETE_PSTL) && _LIBCPP_STD_VER >= 17
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#endif // _LIBCPP___ALGORITHM_PSTL_COPY_H
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