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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
71 lines
2.5 KiB
C++
71 lines
2.5 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_MIN_ELEMENT_H
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#define _LIBCPP___ALGORITHM_MIN_ELEMENT_H
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#include <__algorithm/comp.h>
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#include <__algorithm/comp_ref_type.h>
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#include <__config>
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#include <__functional/identity.h>
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#include <__functional/invoke.h>
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#include <__iterator/iterator_traits.h>
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#include <__type_traits/is_callable.h>
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#include <__utility/move.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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template <class _Comp, class _Iter, class _Sent, class _Proj>
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inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14
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_Iter __min_element(_Iter __first, _Sent __last, _Comp __comp, _Proj& __proj) {
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if (__first == __last)
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return __first;
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_Iter __i = __first;
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while (++__i != __last)
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if (std::__invoke(__comp, std::__invoke(__proj, *__i), std::__invoke(__proj, *__first)))
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__first = __i;
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return __first;
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}
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template <class _Comp, class _Iter, class _Sent>
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_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14
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_Iter __min_element(_Iter __first, _Sent __last, _Comp __comp) {
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auto __proj = __identity();
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return std::__min_element<_Comp>(std::move(__first), std::move(__last), __comp, __proj);
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}
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template <class _ForwardIterator, class _Compare>
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_LIBCPP_NODISCARD_EXT inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 _ForwardIterator
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min_element(_ForwardIterator __first, _ForwardIterator __last, _Compare __comp)
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{
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static_assert(__has_forward_iterator_category<_ForwardIterator>::value,
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"std::min_element requires a ForwardIterator");
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static_assert(__is_callable<_Compare, decltype(*__first), decltype(*__first)>::value,
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"The comparator has to be callable");
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return std::__min_element<__comp_ref_type<_Compare> >(std::move(__first), std::move(__last), __comp);
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}
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template <class _ForwardIterator>
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_LIBCPP_NODISCARD_EXT inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 _ForwardIterator
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min_element(_ForwardIterator __first, _ForwardIterator __last)
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{
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return _VSTD::min_element(__first, __last,
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__less<typename iterator_traits<_ForwardIterator>::value_type>());
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}
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_LIBCPP_END_NAMESPACE_STD
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#endif // _LIBCPP___ALGORITHM_MIN_ELEMENT_H
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