1 //===----------------------------------------------------------------------===//
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
7 //===----------------------------------------------------------------------===//
9 #ifndef _LIBCPP___ALGORITHM_RANGES_MIN_H
10 #define _LIBCPP___ALGORITHM_RANGES_MIN_H
12 #include <__algorithm/ranges_min_element.h>
14 #include <__concepts/copyable.h>
16 #include <__functional/identity.h>
17 #include <__functional/invoke.h>
18 #include <__functional/ranges_operations.h>
19 #include <__iterator/concepts.h>
20 #include <__iterator/projected.h>
21 #include <__ranges/access.h>
22 #include <__ranges/concepts.h>
23 #include <initializer_list>
25 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
26 # pragma GCC system_header
29 #if _LIBCPP_STD_VER > 17
32 #include <__undef_macros>
34 _LIBCPP_BEGIN_NAMESPACE_STD
39 template <class _Tp, class _Proj = identity,
40 indirect_strict_weak_order<projected<const _Tp*, _Proj>> _Comp = ranges::less>
41 _LIBCPP_NODISCARD_EXT _LIBCPP_HIDE_FROM_ABI constexpr
42 const _Tp& operator()(const _Tp& __a, const _Tp& __b, _Comp __comp = {}, _Proj __proj = {}) const {
43 return std::invoke(__comp, std::invoke(__proj, __b), std::invoke(__proj, __a)) ? __b : __a;
46 template <copyable _Tp, class _Proj = identity,
47 indirect_strict_weak_order<projected<const _Tp*, _Proj>> _Comp = ranges::less>
48 _LIBCPP_NODISCARD_EXT _LIBCPP_HIDE_FROM_ABI constexpr
49 _Tp operator()(initializer_list<_Tp> __il, _Comp __comp = {}, _Proj __proj = {}) const {
50 _LIBCPP_ASSERT(__il.begin() != __il.end(), "initializer_list must contain at least one element");
51 return *ranges::__min_element_impl(__il.begin(), __il.end(), __comp, __proj);
54 template <input_range _Rp, class _Proj = identity,
55 indirect_strict_weak_order<projected<iterator_t<_Rp>, _Proj>> _Comp = ranges::less>
56 requires indirectly_copyable_storable<iterator_t<_Rp>, range_value_t<_Rp>*>
57 _LIBCPP_NODISCARD_EXT _LIBCPP_HIDE_FROM_ABI constexpr
58 range_value_t<_Rp> operator()(_Rp&& __r, _Comp __comp = {}, _Proj __proj = {}) const {
59 auto __first = ranges::begin(__r);
60 auto __last = ranges::end(__r);
62 _LIBCPP_ASSERT(__first != __last, "range must contain at least one element");
64 if constexpr (forward_range<_Rp>) {
65 return *ranges::__min_element_impl(__first, __last, __comp, __proj);
67 range_value_t<_Rp> __result = *__first;
68 while (++__first != __last) {
69 if (std::invoke(__comp, std::invoke(__proj, *__first), std::invoke(__proj, __result)))
78 inline namespace __cpo {
79 inline constexpr auto min = __min::__fn{};
83 _LIBCPP_END_NAMESPACE_STD
87 #endif // _LIBCPP_STD_VER > 17 &&
89 #endif // _LIBCPP___ALGORITHM_RANGES_MIN_H