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 #if _LIBCPP_STD_VER >= 20 28 29 _LIBCPP_BEGIN_NAMESPACE_STD 30 31 namespace ranges { 32 namespace __binary_search { 33 struct __fn { 34 template <forward_iterator _Iter, 35 sentinel_for<_Iter> _Sent, 36 class _Type, 37 class _Proj = identity, 38 indirect_strict_weak_order<const _Type*, projected<_Iter, _Proj>> _Comp = ranges::less> 39 _LIBCPP_NODISCARD_EXT _LIBCPP_HIDE_FROM_ABI constexpr bool 40 operator()(_Iter __first, _Sent __last, const _Type& __value, _Comp __comp = {}, _Proj __proj = {}) const { 41 auto __ret = std::__lower_bound<_RangeAlgPolicy>(__first, __last, __value, __comp, __proj); 42 return __ret != __last && !std::invoke(__comp, __value, std::invoke(__proj, *__ret)); 43 } 44 45 template <forward_range _Range, 46 class _Type, 47 class _Proj = identity, 48 indirect_strict_weak_order<const _Type*, projected<iterator_t<_Range>, _Proj>> _Comp = ranges::less> 49 _LIBCPP_NODISCARD_EXT _LIBCPP_HIDE_FROM_ABI constexpr bool 50 operator()(_Range&& __r, const _Type& __value, _Comp __comp = {}, _Proj __proj = {}) const { 51 auto __first = ranges::begin(__r); 52 auto __last = ranges::end(__r); 53 auto __ret = std::__lower_bound<_RangeAlgPolicy>(__first, __last, __value, __comp, __proj); 54 return __ret != __last && !std::invoke(__comp, __value, std::invoke(__proj, *__ret)); 55 } 56 }; 57 } // namespace __binary_search 58 59 inline namespace __cpo { 60 inline constexpr auto binary_search = __binary_search::__fn{}; 61 } // namespace __cpo 62 } // namespace ranges 63 64 _LIBCPP_END_NAMESPACE_STD 65 66 #endif // _LIBCPP_STD_VER >= 20 67 68 #endif // _LIBCPP___ALGORITHM_RANGES_BINARY_SEARCH_H 69