1//===----------------------------------------------------------------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8
9#ifndef _LIBCPP___ALGORITHM_MINMAX_H
10#define _LIBCPP___ALGORITHM_MINMAX_H
11
12#include <__algorithm/comp.h>
13#include <__algorithm/minmax_element.h>
14#include <__config>
15#include <__functional/identity.h>
16#include <__type_traits/is_callable.h>
17#include <__utility/pair.h>
18#include <initializer_list>
19
20#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
21# pragma GCC system_header
22#endif
23
24_LIBCPP_BEGIN_NAMESPACE_STD
25
26template <class _Tp, class _Compare>
27[[__nodiscard__]] inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 pair<const _Tp&, const _Tp&>
28minmax(_LIBCPP_LIFETIMEBOUND const _Tp& __a, _LIBCPP_LIFETIMEBOUND const _Tp& __b, _Compare __comp) {
29 return __comp(__b, __a) ? pair<const _Tp&, const _Tp&>(__b, __a) : pair<const _Tp&, const _Tp&>(__a, __b);
30}
31
32template <class _Tp>
33[[__nodiscard__]] inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 pair<const _Tp&, const _Tp&>
34minmax(_LIBCPP_LIFETIMEBOUND const _Tp& __a, _LIBCPP_LIFETIMEBOUND const _Tp& __b) {
35 return std::minmax(__a, __b, __less<>());
36}
37
38#ifndef _LIBCPP_CXX03_LANG
39
40template <class _Tp, class _Compare>
41[[__nodiscard__]] inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 pair<_Tp, _Tp>
42minmax(initializer_list<_Tp> __t, _Compare __comp) {
43 static_assert(__is_callable<_Compare&, _Tp, _Tp>::value, "The comparator has to be callable");
44 __identity __proj;
45 auto __ret = std::__minmax_element_impl(__t.begin(), __t.end(), __comp, __proj);
46 return pair<_Tp, _Tp>(*__ret.first, *__ret.second);
47}
48
49template <class _Tp>
50[[__nodiscard__]] inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 pair<_Tp, _Tp>
51minmax(initializer_list<_Tp> __t) {
52 return std::minmax(__t, __less<>());
53}
54
55#endif // _LIBCPP_CXX03_LANG
56
57_LIBCPP_END_NAMESPACE_STD
58
59#endif // _LIBCPP___ALGORITHM_MINMAX_H
60