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 <__config> 13 #include <__algorithm/comp.h> 14 #include <initializer_list> 15 #include <utility> 16 17 18 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 19 #pragma GCC system_header 20 #endif 21 22 _LIBCPP_BEGIN_NAMESPACE_STD 23 24 template<class _Tp, class _Compare> 25 _LIBCPP_NODISCARD_EXT inline 26 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 27 pair<const _Tp&, const _Tp&> 28 minmax(const _Tp& __a, const _Tp& __b, _Compare __comp) 29 { 30 return __comp(__b, __a) ? pair<const _Tp&, const _Tp&>(__b, __a) : 31 pair<const _Tp&, const _Tp&>(__a, __b); 32 } 33 34 template<class _Tp> 35 _LIBCPP_NODISCARD_EXT inline 36 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 37 pair<const _Tp&, const _Tp&> 38 minmax(const _Tp& __a, const _Tp& __b) 39 { 40 return _VSTD::minmax(__a, __b, __less<_Tp>()); 41 } 42 43 #ifndef _LIBCPP_CXX03_LANG 44 45 template<class _Tp, class _Compare> 46 _LIBCPP_NODISCARD_EXT inline 47 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 48 pair<_Tp, _Tp> 49 minmax(initializer_list<_Tp> __t, _Compare __comp) 50 { 51 typedef typename initializer_list<_Tp>::const_iterator _Iter; 52 _Iter __first = __t.begin(); 53 _Iter __last = __t.end(); 54 pair<_Tp, _Tp> __result(*__first, *__first); 55 56 ++__first; 57 if (__t.size() % 2 == 0) 58 { 59 if (__comp(*__first, __result.first)) 60 __result.first = *__first; 61 else 62 __result.second = *__first; 63 ++__first; 64 } 65 66 while (__first != __last) 67 { 68 _Tp __prev = *__first++; 69 if (__comp(*__first, __prev)) { 70 if ( __comp(*__first, __result.first)) __result.first = *__first; 71 if (!__comp(__prev, __result.second)) __result.second = __prev; 72 } 73 else { 74 if ( __comp(__prev, __result.first)) __result.first = __prev; 75 if (!__comp(*__first, __result.second)) __result.second = *__first; 76 } 77 78 __first++; 79 } 80 return __result; 81 } 82 83 template<class _Tp> 84 _LIBCPP_NODISCARD_EXT inline 85 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 86 pair<_Tp, _Tp> 87 minmax(initializer_list<_Tp> __t) 88 { 89 return _VSTD::minmax(__t, __less<_Tp>()); 90 } 91 92 #endif // _LIBCPP_CXX03_LANG 93 94 _LIBCPP_END_NAMESPACE_STD 95 96 #endif // _LIBCPP___ALGORITHM_MINMAX_H 97