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| 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___CXX03___ALGORITHM_MIN_ELEMENT_H |
| 10 | #define _LIBCPP___CXX03___ALGORITHM_MIN_ELEMENT_H |
| 11 | |
| 12 | #include <__cxx03/__algorithm/comp.h> |
| 13 | #include <__cxx03/__algorithm/comp_ref_type.h> |
| 14 | #include <__cxx03/__config> |
| 15 | #include <__cxx03/__functional/identity.h> |
| 16 | #include <__cxx03/__iterator/iterator_traits.h> |
| 17 | #include <__cxx03/__type_traits/invoke.h> |
| 18 | #include <__cxx03/__type_traits/is_callable.h> |
| 19 | #include <__cxx03/__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 <__cxx03/__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 _Iter __min_element(_Iter __first, _Sent __last, _Comp __comp, _Proj& __proj) { |
| 32 | if (__first == __last) |
| 33 | return __first; |
| 34 | |
| 35 | _Iter __i = __first; |
| 36 | while (++__i != __last) |
| 37 | if (std::__invoke(__comp, std::__invoke(__proj, *__i), std::__invoke(__proj, *__first))) |
| 38 | __first = __i; |
| 39 | |
| 40 | return __first; |
| 41 | } |
| 42 | |
| 43 | template <class _Comp, class _Iter, class _Sent> |
| 44 | _LIBCPP_HIDE_FROM_ABI _Iter __min_element(_Iter __first, _Sent __last, _Comp __comp) { |
| 45 | auto __proj = __identity(); |
| 46 | return std::__min_element<_Comp>(std::move(__first), std::move(__last), __comp, __proj); |
| 47 | } |
| 48 | |
| 49 | template <class _ForwardIterator, class _Compare> |
| 50 | _LIBCPP_NODISCARD inline _LIBCPP_HIDE_FROM_ABI _ForwardIterator |
| 51 | min_element(_ForwardIterator __first, _ForwardIterator __last, _Compare __comp) { |
| 52 | static_assert( |
| 53 | __has_forward_iterator_category<_ForwardIterator>::value, "std::min_element requires a ForwardIterator"); |
| 54 | static_assert( |
| 55 | __is_callable<_Compare, decltype(*__first), decltype(*__first)>::value, "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 inline _LIBCPP_HIDE_FROM_ABI _ForwardIterator |
| 62 | min_element(_ForwardIterator __first, _ForwardIterator __last) { |
| 63 | return std::min_element(__first, __last, __less<>()); |
| 64 | } |
| 65 | |
| 66 | _LIBCPP_END_NAMESPACE_STD |
| 67 | |
| 68 | _LIBCPP_POP_MACROS |
| 69 | |
| 70 | #endif // _LIBCPP___CXX03___ALGORITHM_MIN_ELEMENT_H |
| 71 |
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