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_MIN_ELEMENT_H 10 #define _LIBCPP___ALGORITHM_MIN_ELEMENT_H 11 12 #include <__algorithm/comp.h> 13 #include <__algorithm/comp_ref_type.h> 14 #include <__config> 15 #include <__functional/identity.h> 16 #include <__functional/invoke.h> 17 #include <__iterator/iterator_traits.h> 18 #include <__type_traits/is_callable.h> 19 #include <__utility/move.h> 20 21 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 22 # pragma GCC system_header 23 #endif 24 25 _LIBCPP_PUSH_MACROS 26 #include <__undef_macros> 27 28 _LIBCPP_BEGIN_NAMESPACE_STD 29 30 template <class _Comp, class _Iter, class _Sent, class _Proj> 31 inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 _Iter 32 __min_element(_Iter __first, _Sent __last, _Comp __comp, _Proj& __proj) { 33 if (__first == __last) 34 return __first; 35 36 _Iter __i = __first; 37 while (++__i != __last) 38 if (std::__invoke(__comp, std::__invoke(__proj, *__i), std::__invoke(__proj, *__first))) 39 __first = __i; 40 41 return __first; 42 } 43 44 template <class _Comp, class _Iter, class _Sent> 45 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 _Iter __min_element(_Iter __first, _Sent __last, _Comp __comp) { 46 auto __proj = __identity(); 47 return std::__min_element<_Comp>(std::move(__first), std::move(__last), __comp, __proj); 48 } 49 50 template <class _ForwardIterator, class _Compare> 51 _LIBCPP_NODISCARD inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 _ForwardIterator 52 min_element(_ForwardIterator __first, _ForwardIterator __last, _Compare __comp) { 53 static_assert( 54 __has_forward_iterator_category<_ForwardIterator>::value, "std::min_element requires a ForwardIterator"); 55 static_assert( 56 __is_callable<_Compare, decltype(*__first), decltype(*__first)>::value, "The comparator has to be callable"); 57 58 return std::__min_element<__comp_ref_type<_Compare> >(std::move(__first), std::move(__last), __comp); 59 } 60 61 template <class _ForwardIterator> 62 _LIBCPP_NODISCARD inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 _ForwardIterator 63 min_element(_ForwardIterator __first, _ForwardIterator __last) { 64 return std::min_element(__first, __last, __less<>()); 65 } 66 67 _LIBCPP_END_NAMESPACE_STD 68 69 _LIBCPP_POP_MACROS 70 71 #endif // _LIBCPP___ALGORITHM_MIN_ELEMENT_H 72