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_BEGIN_NAMESPACE_STD 26 27 template <class _Comp, class _Iter, class _Sent, class _Proj> 28 inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 29 _Iter __min_element(_Iter __first, _Sent __last, _Comp __comp, _Proj& __proj) { 30 if (__first == __last) 31 return __first; 32 33 _Iter __i = __first; 34 while (++__i != __last) 35 if (std::__invoke(__comp, std::__invoke(__proj, *__i), std::__invoke(__proj, *__first))) 36 __first = __i; 37 38 return __first; 39 } 40 41 template <class _Comp, class _Iter, class _Sent> 42 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 43 _Iter __min_element(_Iter __first, _Sent __last, _Comp __comp) { 44 auto __proj = __identity(); 45 return std::__min_element<_Comp>(std::move(__first), std::move(__last), __comp, __proj); 46 } 47 48 template <class _ForwardIterator, class _Compare> 49 _LIBCPP_NODISCARD_EXT inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 _ForwardIterator 50 min_element(_ForwardIterator __first, _ForwardIterator __last, _Compare __comp) 51 { 52 static_assert(__is_cpp17_forward_iterator<_ForwardIterator>::value, 53 "std::min_element requires a ForwardIterator"); 54 static_assert(__is_callable<_Compare, decltype(*__first), decltype(*__first)>::value, 55 "The comparator has to be callable"); 56 57 return std::__min_element<__comp_ref_type<_Compare> >(std::move(__first), std::move(__last), __comp); 58 } 59 60 template <class _ForwardIterator> 61 _LIBCPP_NODISCARD_EXT inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 _ForwardIterator 62 min_element(_ForwardIterator __first, _ForwardIterator __last) 63 { 64 return _VSTD::min_element(__first, __last, 65 __less<typename iterator_traits<_ForwardIterator>::value_type>()); 66 } 67 68 _LIBCPP_END_NAMESPACE_STD 69 70 #endif // _LIBCPP___ALGORITHM_MIN_ELEMENT_H 71