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_PUSH_MACROS 23 #include <__undef_macros> 24 25 _LIBCPP_BEGIN_NAMESPACE_STD 26 27 template<class _Tp, class _Compare> 28 _LIBCPP_NODISCARD_EXT inline 29 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 30 pair<const _Tp&, const _Tp&> 31 minmax(const _Tp& __a, const _Tp& __b, _Compare __comp) 32 { 33 return __comp(__b, __a) ? pair<const _Tp&, const _Tp&>(__b, __a) : 34 pair<const _Tp&, const _Tp&>(__a, __b); 35 } 36 37 template<class _Tp> 38 _LIBCPP_NODISCARD_EXT inline 39 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 40 pair<const _Tp&, const _Tp&> 41 minmax(const _Tp& __a, const _Tp& __b) 42 { 43 return _VSTD::minmax(__a, __b, __less<_Tp>()); 44 } 45 46 #ifndef _LIBCPP_CXX03_LANG 47 48 template<class _Tp, class _Compare> 49 _LIBCPP_NODISCARD_EXT inline 50 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 51 pair<_Tp, _Tp> 52 minmax(initializer_list<_Tp> __t, _Compare __comp) 53 { 54 typedef typename initializer_list<_Tp>::const_iterator _Iter; 55 _Iter __first = __t.begin(); 56 _Iter __last = __t.end(); 57 pair<_Tp, _Tp> __result(*__first, *__first); 58 59 ++__first; 60 if (__t.size() % 2 == 0) 61 { 62 if (__comp(*__first, __result.first)) 63 __result.first = *__first; 64 else 65 __result.second = *__first; 66 ++__first; 67 } 68 69 while (__first != __last) 70 { 71 _Tp __prev = *__first++; 72 if (__comp(*__first, __prev)) { 73 if ( __comp(*__first, __result.first)) __result.first = *__first; 74 if (!__comp(__prev, __result.second)) __result.second = __prev; 75 } 76 else { 77 if ( __comp(__prev, __result.first)) __result.first = __prev; 78 if (!__comp(*__first, __result.second)) __result.second = *__first; 79 } 80 81 __first++; 82 } 83 return __result; 84 } 85 86 template<class _Tp> 87 _LIBCPP_NODISCARD_EXT inline 88 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 89 pair<_Tp, _Tp> 90 minmax(initializer_list<_Tp> __t) 91 { 92 return _VSTD::minmax(__t, __less<_Tp>()); 93 } 94 95 #endif // _LIBCPP_CXX03_LANG 96 97 _LIBCPP_END_NAMESPACE_STD 98 99 _LIBCPP_POP_MACROS 100 101 #endif // _LIBCPP___ALGORITHM_MINMAX_H 102