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___ALGORITHM_RANGES_BINARY_SEARCH_H 10 #define _LIBCPP___ALGORITHM_RANGES_BINARY_SEARCH_H 11 12 #include <__algorithm/iterator_operations.h> 13 #include <__algorithm/lower_bound.h> 14 #include <__config> 15 #include <__functional/identity.h> 16 #include <__functional/invoke.h> 17 #include <__functional/ranges_operations.h> 18 #include <__iterator/concepts.h> 19 #include <__iterator/projected.h> 20 #include <__ranges/access.h> 21 #include <__ranges/concepts.h> 22 23 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 24 # pragma GCC system_header 25 #endif 26 27 _LIBCPP_PUSH_MACROS 28 #include <__undef_macros> 29 30 #if _LIBCPP_STD_VER >= 20 31 32 _LIBCPP_BEGIN_NAMESPACE_STD 33 34 namespace ranges { 35 namespace __binary_search { 36 struct __fn { 37 template <forward_iterator _Iter, 38 sentinel_for<_Iter> _Sent, 39 class _Type, 40 class _Proj = identity, 41 indirect_strict_weak_order<const _Type*, projected<_Iter, _Proj>> _Comp = ranges::less> 42 [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr bool operator__fn43 operator()(_Iter __first, _Sent __last, const _Type& __value, _Comp __comp = {}, _Proj __proj = {}) const { 44 auto __ret = std::__lower_bound<_RangeAlgPolicy>(__first, __last, __value, __comp, __proj); 45 return __ret != __last && !std::invoke(__comp, __value, std::invoke(__proj, *__ret)); 46 } 47 48 template <forward_range _Range, 49 class _Type, 50 class _Proj = identity, 51 indirect_strict_weak_order<const _Type*, projected<iterator_t<_Range>, _Proj>> _Comp = ranges::less> 52 [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr bool operator__fn53 operator()(_Range&& __r, const _Type& __value, _Comp __comp = {}, _Proj __proj = {}) const { 54 auto __first = ranges::begin(__r); 55 auto __last = ranges::end(__r); 56 auto __ret = std::__lower_bound<_RangeAlgPolicy>(__first, __last, __value, __comp, __proj); 57 return __ret != __last && !std::invoke(__comp, __value, std::invoke(__proj, *__ret)); 58 } 59 }; 60 } // namespace __binary_search 61 62 inline namespace __cpo { 63 inline constexpr auto binary_search = __binary_search::__fn{}; 64 } // namespace __cpo 65 } // namespace ranges 66 67 _LIBCPP_END_NAMESPACE_STD 68 69 #endif // _LIBCPP_STD_VER >= 20 70 71 _LIBCPP_POP_MACROS 72 73 #endif // _LIBCPP___ALGORITHM_RANGES_BINARY_SEARCH_H 74