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_EXT inline 28 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14 29 pair<const _Tp&, const _Tp&> 30 minmax(_LIBCPP_LIFETIMEBOUND const _Tp& __a, _LIBCPP_LIFETIMEBOUND const _Tp& __b, _Compare __comp) 31 { 32 return __comp(__b, __a) ? pair<const _Tp&, const _Tp&>(__b, __a) : 33 pair<const _Tp&, const _Tp&>(__a, __b); 34 } 35 36 template<class _Tp> 37 _LIBCPP_NODISCARD_EXT inline 38 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14 39 pair<const _Tp&, const _Tp&> 40 minmax(_LIBCPP_LIFETIMEBOUND const _Tp& __a, _LIBCPP_LIFETIMEBOUND const _Tp& __b) 41 { 42 return std::minmax(__a, __b, __less<>()); 43 } 44 45 #ifndef _LIBCPP_CXX03_LANG 46 47 template<class _Tp, class _Compare> 48 _LIBCPP_NODISCARD_EXT inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 49 pair<_Tp, _Tp> minmax(initializer_list<_Tp> __t, _Compare __comp) { 50 static_assert(__is_callable<_Compare, _Tp, _Tp>::value, "The comparator has to be callable"); 51 __identity __proj; 52 auto __ret = std::__minmax_element_impl(__t.begin(), __t.end(), __comp, __proj); 53 return pair<_Tp, _Tp>(*__ret.first, *__ret.second); 54 } 55 56 template<class _Tp> 57 _LIBCPP_NODISCARD_EXT inline 58 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14 59 pair<_Tp, _Tp> 60 minmax(initializer_list<_Tp> __t) 61 { 62 return std::minmax(__t, __less<>()); 63 } 64 65 #endif // _LIBCPP_CXX03_LANG 66 67 _LIBCPP_END_NAMESPACE_STD 68 69 #endif // _LIBCPP___ALGORITHM_MINMAX_H 70