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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
103 lines
3.4 KiB
C++
103 lines
3.4 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_MINMAX_ELEMENT_H
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#define _LIBCPP___ALGORITHM_MINMAX_ELEMENT_H
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#include <__algorithm/comp.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/pair.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 _Proj>
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class _MinmaxElementLessFunc {
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_Comp& __comp_;
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_Proj& __proj_;
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public:
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_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR
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_MinmaxElementLessFunc(_Comp& __comp, _Proj& __proj) : __comp_(__comp), __proj_(__proj) {}
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template <class _Iter>
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_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14
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bool operator()(_Iter& __it1, _Iter& __it2) {
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return std::__invoke(__comp_, std::__invoke(__proj_, *__it1), std::__invoke(__proj_, *__it2));
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}
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};
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template <class _Iter, class _Sent, class _Proj, class _Comp>
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_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14
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pair<_Iter, _Iter> __minmax_element_impl(_Iter __first, _Sent __last, _Comp& __comp, _Proj& __proj) {
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auto __less = _MinmaxElementLessFunc<_Comp, _Proj>(__comp, __proj);
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pair<_Iter, _Iter> __result(__first, __first);
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if (__first == __last || ++__first == __last)
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return __result;
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if (__less(__first, __result.first))
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__result.first = __first;
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else
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__result.second = __first;
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while (++__first != __last) {
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_Iter __i = __first;
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if (++__first == __last) {
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if (__less(__i, __result.first))
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__result.first = __i;
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else if (!__less(__i, __result.second))
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__result.second = __i;
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return __result;
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}
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if (__less(__first, __i)) {
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if (__less(__first, __result.first))
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__result.first = __first;
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if (!__less(__i, __result.second))
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__result.second = __i;
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} else {
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if (__less(__i, __result.first))
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__result.first = __i;
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if (!__less(__first, __result.second))
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__result.second = __first;
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}
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}
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return __result;
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}
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template <class _ForwardIterator, class _Compare>
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_LIBCPP_NODISCARD_EXT _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14
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pair<_ForwardIterator, _ForwardIterator>
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minmax_element(_ForwardIterator __first, _ForwardIterator __last, _Compare __comp) {
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static_assert(__has_forward_iterator_category<_ForwardIterator>::value,
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"std::minmax_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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auto __proj = __identity();
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return std::__minmax_element_impl(__first, __last, __comp, __proj);
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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
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pair<_ForwardIterator, _ForwardIterator> minmax_element(_ForwardIterator __first, _ForwardIterator __last) {
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return std::minmax_element(__first, __last, __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_MINMAX_ELEMENT_H
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