1e78f53d1SNikolas Klauser //===----------------------------------------------------------------------===// 2e78f53d1SNikolas Klauser // 3e78f53d1SNikolas Klauser // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4e78f53d1SNikolas Klauser // See https://llvm.org/LICENSE.txt for license information. 5e78f53d1SNikolas Klauser // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6e78f53d1SNikolas Klauser // 7e78f53d1SNikolas Klauser //===----------------------------------------------------------------------===// 8e78f53d1SNikolas Klauser 9*ce777190SNikolas Klauser #ifndef _LIBCPP___CXX03___ALGORITHM_MIN_ELEMENT_H 10*ce777190SNikolas Klauser #define _LIBCPP___CXX03___ALGORITHM_MIN_ELEMENT_H 11e78f53d1SNikolas Klauser 1273fbae83SNikolas Klauser #include <__cxx03/__algorithm/comp.h> 1373fbae83SNikolas Klauser #include <__cxx03/__algorithm/comp_ref_type.h> 1473fbae83SNikolas Klauser #include <__cxx03/__config> 1573fbae83SNikolas Klauser #include <__cxx03/__functional/identity.h> 1673fbae83SNikolas Klauser #include <__cxx03/__functional/invoke.h> 1773fbae83SNikolas Klauser #include <__cxx03/__iterator/iterator_traits.h> 1873fbae83SNikolas Klauser #include <__cxx03/__type_traits/is_callable.h> 1973fbae83SNikolas Klauser #include <__cxx03/__utility/move.h> 20e78f53d1SNikolas Klauser 21e78f53d1SNikolas Klauser #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 22e78f53d1SNikolas Klauser # pragma GCC system_header 23e78f53d1SNikolas Klauser #endif 24e78f53d1SNikolas Klauser 25e78f53d1SNikolas Klauser _LIBCPP_PUSH_MACROS 2673fbae83SNikolas Klauser #include <__cxx03/__undef_macros> 27e78f53d1SNikolas Klauser 28e78f53d1SNikolas Klauser _LIBCPP_BEGIN_NAMESPACE_STD 29e78f53d1SNikolas Klauser 30e78f53d1SNikolas Klauser template <class _Comp, class _Iter, class _Sent, class _Proj> 31e78f53d1SNikolas Klauser inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 _Iter 32e78f53d1SNikolas Klauser __min_element(_Iter __first, _Sent __last, _Comp __comp, _Proj& __proj) { 33e78f53d1SNikolas Klauser if (__first == __last) 34e78f53d1SNikolas Klauser return __first; 35e78f53d1SNikolas Klauser 36e78f53d1SNikolas Klauser _Iter __i = __first; 37e78f53d1SNikolas Klauser while (++__i != __last) 38e78f53d1SNikolas Klauser if (std::__invoke(__comp, std::__invoke(__proj, *__i), std::__invoke(__proj, *__first))) 39e78f53d1SNikolas Klauser __first = __i; 40e78f53d1SNikolas Klauser 41e78f53d1SNikolas Klauser return __first; 42e78f53d1SNikolas Klauser } 43e78f53d1SNikolas Klauser 44e78f53d1SNikolas Klauser template <class _Comp, class _Iter, class _Sent> 45e78f53d1SNikolas Klauser _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 _Iter __min_element(_Iter __first, _Sent __last, _Comp __comp) { 46e78f53d1SNikolas Klauser auto __proj = __identity(); 47e78f53d1SNikolas Klauser return std::__min_element<_Comp>(std::move(__first), std::move(__last), __comp, __proj); 48e78f53d1SNikolas Klauser } 49e78f53d1SNikolas Klauser 50e78f53d1SNikolas Klauser template <class _ForwardIterator, class _Compare> 51e78f53d1SNikolas Klauser _LIBCPP_NODISCARD inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 _ForwardIterator 52e78f53d1SNikolas Klauser min_element(_ForwardIterator __first, _ForwardIterator __last, _Compare __comp) { 53e78f53d1SNikolas Klauser static_assert( 54e78f53d1SNikolas Klauser __has_forward_iterator_category<_ForwardIterator>::value, "std::min_element requires a ForwardIterator"); 55e78f53d1SNikolas Klauser static_assert( 56e78f53d1SNikolas Klauser __is_callable<_Compare, decltype(*__first), decltype(*__first)>::value, "The comparator has to be callable"); 57e78f53d1SNikolas Klauser 58e78f53d1SNikolas Klauser return std::__min_element<__comp_ref_type<_Compare> >(std::move(__first), std::move(__last), __comp); 59e78f53d1SNikolas Klauser } 60e78f53d1SNikolas Klauser 61e78f53d1SNikolas Klauser template <class _ForwardIterator> 62e78f53d1SNikolas Klauser _LIBCPP_NODISCARD inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 _ForwardIterator 63e78f53d1SNikolas Klauser min_element(_ForwardIterator __first, _ForwardIterator __last) { 64e78f53d1SNikolas Klauser return std::min_element(__first, __last, __less<>()); 65e78f53d1SNikolas Klauser } 66e78f53d1SNikolas Klauser 67e78f53d1SNikolas Klauser _LIBCPP_END_NAMESPACE_STD 68e78f53d1SNikolas Klauser 69e78f53d1SNikolas Klauser _LIBCPP_POP_MACROS 70e78f53d1SNikolas Klauser 71*ce777190SNikolas Klauser #endif // _LIBCPP___CXX03___ALGORITHM_MIN_ELEMENT_H 72