xref: /freebsd/contrib/llvm-project/libcxx/include/__algorithm/minmax.h (revision b1879975794772ee51f0b4865753364c7d7626c3)
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 
26 template <class _Tp, class _Compare>
27 _LIBCPP_NODISCARD inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 pair<const _Tp&, const _Tp&>
28 minmax(_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 
32 template <class _Tp>
33 _LIBCPP_NODISCARD inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 pair<const _Tp&, const _Tp&>
34 minmax(_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 
40 template <class _Tp, class _Compare>
41 _LIBCPP_NODISCARD inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 pair<_Tp, _Tp>
42 minmax(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 
49 template <class _Tp>
50 _LIBCPP_NODISCARD inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 pair<_Tp, _Tp>
51 minmax(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