forked from OSchip/llvm-project
102 lines
2.7 KiB
C++
102 lines
2.7 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_H
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#define _LIBCPP___ALGORITHM_MINMAX_H
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#include <__config>
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#include <__algorithm/comp.h>
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#include <initializer_list>
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#include <utility>
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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_PUSH_MACROS
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#include <__undef_macros>
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_LIBCPP_BEGIN_NAMESPACE_STD
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template<class _Tp, class _Compare>
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_LIBCPP_NODISCARD_EXT inline
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_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
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pair<const _Tp&, const _Tp&>
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minmax(const _Tp& __a, const _Tp& __b, _Compare __comp)
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{
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return __comp(__b, __a) ? pair<const _Tp&, const _Tp&>(__b, __a) :
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pair<const _Tp&, const _Tp&>(__a, __b);
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}
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template<class _Tp>
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_LIBCPP_NODISCARD_EXT inline
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_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
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pair<const _Tp&, const _Tp&>
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minmax(const _Tp& __a, const _Tp& __b)
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{
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return _VSTD::minmax(__a, __b, __less<_Tp>());
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}
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#ifndef _LIBCPP_CXX03_LANG
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template<class _Tp, class _Compare>
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_LIBCPP_NODISCARD_EXT inline
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_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
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pair<_Tp, _Tp>
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minmax(initializer_list<_Tp> __t, _Compare __comp)
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{
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typedef typename initializer_list<_Tp>::const_iterator _Iter;
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_Iter __first = __t.begin();
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_Iter __last = __t.end();
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pair<_Tp, _Tp> __result(*__first, *__first);
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++__first;
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if (__t.size() % 2 == 0)
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{
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if (__comp(*__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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++__first;
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}
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while (__first != __last)
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{
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_Tp __prev = *__first++;
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if (__comp(*__first, __prev)) {
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if ( __comp(*__first, __result.first)) __result.first = *__first;
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if (!__comp(__prev, __result.second)) __result.second = __prev;
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}
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else {
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if ( __comp(__prev, __result.first)) __result.first = __prev;
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if (!__comp(*__first, __result.second)) __result.second = *__first;
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}
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__first++;
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}
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return __result;
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}
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template<class _Tp>
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_LIBCPP_NODISCARD_EXT inline
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_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
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pair<_Tp, _Tp>
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minmax(initializer_list<_Tp> __t)
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{
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return _VSTD::minmax(__t, __less<_Tp>());
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}
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#endif // _LIBCPP_CXX03_LANG
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_LIBCPP_END_NAMESPACE_STD
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_LIBCPP_POP_MACROS
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#endif // _LIBCPP___ALGORITHM_MINMAX_H
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