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>
__min_element(_Iter __first,_Sent __last,_Comp __comp,_Proj & __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>
__min_element(_Iter __first,_Sent __last,_Comp __comp)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
min_element(_ForwardIterator __first,_ForwardIterator __last,_Compare __comp)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
min_element(_ForwardIterator __first,_ForwardIterator __last)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