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