181ad6265SDimitry Andric //===----------------------------------------------------------------------===// 281ad6265SDimitry Andric // 381ad6265SDimitry Andric // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 481ad6265SDimitry Andric // See https://llvm.org/LICENSE.txt for license information. 581ad6265SDimitry Andric // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 681ad6265SDimitry Andric // 781ad6265SDimitry Andric //===----------------------------------------------------------------------===// 881ad6265SDimitry Andric 981ad6265SDimitry Andric #ifndef _LIBCPP___ALGORITHM_RANGES_MIN_H 1081ad6265SDimitry Andric #define _LIBCPP___ALGORITHM_RANGES_MIN_H 1181ad6265SDimitry Andric 1281ad6265SDimitry Andric #include <__algorithm/ranges_min_element.h> 1381ad6265SDimitry Andric #include <__assert> 1481ad6265SDimitry Andric #include <__concepts/copyable.h> 1581ad6265SDimitry Andric #include <__config> 1681ad6265SDimitry Andric #include <__functional/identity.h> 1781ad6265SDimitry Andric #include <__functional/invoke.h> 1881ad6265SDimitry Andric #include <__functional/ranges_operations.h> 1981ad6265SDimitry Andric #include <__iterator/concepts.h> 2081ad6265SDimitry Andric #include <__iterator/projected.h> 2181ad6265SDimitry Andric #include <__ranges/access.h> 2281ad6265SDimitry Andric #include <__ranges/concepts.h> 2306c3fb27SDimitry Andric #include <__type_traits/is_trivially_copyable.h> 2481ad6265SDimitry Andric #include <initializer_list> 2581ad6265SDimitry Andric 2681ad6265SDimitry Andric #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 2781ad6265SDimitry Andric # pragma GCC system_header 2881ad6265SDimitry Andric #endif 2981ad6265SDimitry Andric 3006c3fb27SDimitry Andric #if _LIBCPP_STD_VER >= 20 3181ad6265SDimitry Andric 3281ad6265SDimitry Andric _LIBCPP_PUSH_MACROS 3381ad6265SDimitry Andric # include <__undef_macros> 3481ad6265SDimitry Andric 3581ad6265SDimitry Andric _LIBCPP_BEGIN_NAMESPACE_STD 3681ad6265SDimitry Andric 3781ad6265SDimitry Andric namespace ranges { 3881ad6265SDimitry Andric namespace __min { 3981ad6265SDimitry Andric struct __fn { 4006c3fb27SDimitry Andric template <class _Tp, 4106c3fb27SDimitry Andric class _Proj = identity, 4281ad6265SDimitry Andric indirect_strict_weak_order<projected<const _Tp*, _Proj>> _Comp = ranges::less> 43*0fca6ea1SDimitry Andric [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr const _Tp& 4406c3fb27SDimitry Andric operator()(_LIBCPP_LIFETIMEBOUND const _Tp& __a, 4506c3fb27SDimitry Andric _LIBCPP_LIFETIMEBOUND const _Tp& __b, 4606c3fb27SDimitry Andric _Comp __comp = {}, 4706c3fb27SDimitry Andric _Proj __proj = {}) const { 4881ad6265SDimitry Andric return std::invoke(__comp, std::invoke(__proj, __b), std::invoke(__proj, __a)) ? __b : __a; 4981ad6265SDimitry Andric } 5081ad6265SDimitry Andric 5106c3fb27SDimitry Andric template <copyable _Tp, 5206c3fb27SDimitry Andric class _Proj = identity, 5381ad6265SDimitry Andric indirect_strict_weak_order<projected<const _Tp*, _Proj>> _Comp = ranges::less> 54*0fca6ea1SDimitry Andric [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr _Tp 5506c3fb27SDimitry Andric operator()(initializer_list<_Tp> __il, _Comp __comp = {}, _Proj __proj = {}) const { 56cb14a3feSDimitry Andric _LIBCPP_ASSERT_VALID_ELEMENT_ACCESS( 57cb14a3feSDimitry Andric __il.begin() != __il.end(), "initializer_list must contain at least one element"); 5881ad6265SDimitry Andric return *ranges::__min_element_impl(__il.begin(), __il.end(), __comp, __proj); 5981ad6265SDimitry Andric } 6081ad6265SDimitry Andric 6106c3fb27SDimitry Andric template <input_range _Rp, 6206c3fb27SDimitry Andric class _Proj = identity, 6381ad6265SDimitry Andric indirect_strict_weak_order<projected<iterator_t<_Rp>, _Proj>> _Comp = ranges::less> 6481ad6265SDimitry Andric requires indirectly_copyable_storable<iterator_t<_Rp>, range_value_t<_Rp>*> 65*0fca6ea1SDimitry Andric [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr range_value_t<_Rp> 6606c3fb27SDimitry Andric operator()(_Rp&& __r, _Comp __comp = {}, _Proj __proj = {}) const { 6781ad6265SDimitry Andric auto __first = ranges::begin(__r); 6881ad6265SDimitry Andric auto __last = ranges::end(__r); 69cb14a3feSDimitry Andric _LIBCPP_ASSERT_VALID_ELEMENT_ACCESS(__first != __last, "range must contain at least one element"); 7006c3fb27SDimitry Andric if constexpr (forward_range<_Rp> && !__is_cheap_to_copy<range_value_t<_Rp>>) { 7181ad6265SDimitry Andric return *ranges::__min_element_impl(__first, __last, __comp, __proj); 7281ad6265SDimitry Andric } else { 7381ad6265SDimitry Andric range_value_t<_Rp> __result = *__first; 7481ad6265SDimitry Andric while (++__first != __last) { 7581ad6265SDimitry Andric if (std::invoke(__comp, std::invoke(__proj, *__first), std::invoke(__proj, __result))) 7681ad6265SDimitry Andric __result = *__first; 7781ad6265SDimitry Andric } 7881ad6265SDimitry Andric return __result; 7981ad6265SDimitry Andric } 8081ad6265SDimitry Andric } 8181ad6265SDimitry Andric }; 8281ad6265SDimitry Andric } // namespace __min 8381ad6265SDimitry Andric 8481ad6265SDimitry Andric inline namespace __cpo { 8581ad6265SDimitry Andric inline constexpr auto min = __min::__fn{}; 8681ad6265SDimitry Andric } // namespace __cpo 8781ad6265SDimitry Andric } // namespace ranges 8881ad6265SDimitry Andric 8981ad6265SDimitry Andric _LIBCPP_END_NAMESPACE_STD 9081ad6265SDimitry Andric 9181ad6265SDimitry Andric _LIBCPP_POP_MACROS 9281ad6265SDimitry Andric 93*0fca6ea1SDimitry Andric #endif // _LIBCPP_STD_VER >= 20 9481ad6265SDimitry Andric 9581ad6265SDimitry Andric #endif // _LIBCPP___ALGORITHM_RANGES_MIN_H 96