1*4bdff4beSrobert //===----------------------------------------------------------------------===//
2*4bdff4beSrobert //
3*4bdff4beSrobert // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4*4bdff4beSrobert // See https://llvm.org/LICENSE.txt for license information.
5*4bdff4beSrobert // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6*4bdff4beSrobert //
7*4bdff4beSrobert //===----------------------------------------------------------------------===//
8*4bdff4beSrobert
9*4bdff4beSrobert #ifndef _LIBCPP___ALGORITHM_RANGES_MIN_ELEMENT_H
10*4bdff4beSrobert #define _LIBCPP___ALGORITHM_RANGES_MIN_ELEMENT_H
11*4bdff4beSrobert
12*4bdff4beSrobert #include <__config>
13*4bdff4beSrobert #include <__functional/identity.h>
14*4bdff4beSrobert #include <__functional/invoke.h>
15*4bdff4beSrobert #include <__functional/ranges_operations.h>
16*4bdff4beSrobert #include <__iterator/concepts.h>
17*4bdff4beSrobert #include <__iterator/projected.h>
18*4bdff4beSrobert #include <__ranges/access.h>
19*4bdff4beSrobert #include <__ranges/concepts.h>
20*4bdff4beSrobert #include <__ranges/dangling.h>
21*4bdff4beSrobert #include <__utility/forward.h>
22*4bdff4beSrobert
23*4bdff4beSrobert #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
24*4bdff4beSrobert # pragma GCC system_header
25*4bdff4beSrobert #endif
26*4bdff4beSrobert
27*4bdff4beSrobert #if _LIBCPP_STD_VER > 17
28*4bdff4beSrobert
29*4bdff4beSrobert _LIBCPP_BEGIN_NAMESPACE_STD
30*4bdff4beSrobert
31*4bdff4beSrobert namespace ranges {
32*4bdff4beSrobert
33*4bdff4beSrobert // TODO(ranges): `ranges::min_element` can now simply delegate to `std::__min_element`.
34*4bdff4beSrobert template <class _Ip, class _Sp, class _Proj, class _Comp>
35*4bdff4beSrobert _LIBCPP_HIDE_FROM_ABI static constexpr
__min_element_impl(_Ip __first,_Sp __last,_Comp & __comp,_Proj & __proj)36*4bdff4beSrobert _Ip __min_element_impl(_Ip __first, _Sp __last, _Comp& __comp, _Proj& __proj) {
37*4bdff4beSrobert if (__first == __last)
38*4bdff4beSrobert return __first;
39*4bdff4beSrobert
40*4bdff4beSrobert _Ip __i = __first;
41*4bdff4beSrobert while (++__i != __last)
42*4bdff4beSrobert if (std::invoke(__comp, std::invoke(__proj, *__i), std::invoke(__proj, *__first)))
43*4bdff4beSrobert __first = __i;
44*4bdff4beSrobert return __first;
45*4bdff4beSrobert }
46*4bdff4beSrobert
47*4bdff4beSrobert namespace __min_element {
48*4bdff4beSrobert struct __fn {
49*4bdff4beSrobert template <forward_iterator _Ip, sentinel_for<_Ip> _Sp, class _Proj = identity,
50*4bdff4beSrobert indirect_strict_weak_order<projected<_Ip, _Proj>> _Comp = ranges::less>
51*4bdff4beSrobert _LIBCPP_NODISCARD_EXT _LIBCPP_HIDE_FROM_ABI constexpr
operator__fn52*4bdff4beSrobert _Ip operator()(_Ip __first, _Sp __last, _Comp __comp = {}, _Proj __proj = {}) const {
53*4bdff4beSrobert return ranges::__min_element_impl(__first, __last, __comp, __proj);
54*4bdff4beSrobert }
55*4bdff4beSrobert
56*4bdff4beSrobert template <forward_range _Rp, class _Proj = identity,
57*4bdff4beSrobert indirect_strict_weak_order<projected<iterator_t<_Rp>, _Proj>> _Comp = ranges::less>
58*4bdff4beSrobert _LIBCPP_NODISCARD_EXT _LIBCPP_HIDE_FROM_ABI constexpr
operator__fn59*4bdff4beSrobert borrowed_iterator_t<_Rp> operator()(_Rp&& __r, _Comp __comp = {}, _Proj __proj = {}) const {
60*4bdff4beSrobert return ranges::__min_element_impl(ranges::begin(__r), ranges::end(__r), __comp, __proj);
61*4bdff4beSrobert }
62*4bdff4beSrobert };
63*4bdff4beSrobert } // namespace __min_element
64*4bdff4beSrobert
65*4bdff4beSrobert inline namespace __cpo {
66*4bdff4beSrobert inline constexpr auto min_element = __min_element::__fn{};
67*4bdff4beSrobert } // namespace __cpo
68*4bdff4beSrobert } // namespace ranges
69*4bdff4beSrobert
70*4bdff4beSrobert _LIBCPP_END_NAMESPACE_STD
71*4bdff4beSrobert
72*4bdff4beSrobert #endif // _LIBCPP_STD_VER > 17
73*4bdff4beSrobert
74*4bdff4beSrobert #endif // _LIBCPP___ALGORITHM_RANGES_MIN_ELEMENT_H
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