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 > 17 28 29_LIBCPP_BEGIN_NAMESPACE_STD 30 31namespace ranges { 32namespace __binary_search { 33struct __fn { 34 template <forward_iterator _Iter, sentinel_for<_Iter> _Sent, class _Type, class _Proj = identity, 35 indirect_strict_weak_order<const _Type*, projected<_Iter, _Proj>> _Comp = ranges::less> 36 _LIBCPP_NODISCARD_EXT _LIBCPP_HIDE_FROM_ABI constexpr 37 bool operator()(_Iter __first, _Sent __last, const _Type& __value, _Comp __comp = {}, _Proj __proj = {}) const { 38 auto __ret = std::__lower_bound_impl<_RangeAlgPolicy>(__first, __last, __value, __comp, __proj); 39 return __ret != __last && !std::invoke(__comp, __value, std::invoke(__proj, *__ret)); 40 } 41 42 template <forward_range _Range, class _Type, class _Proj = identity, 43 indirect_strict_weak_order<const _Type*, projected<iterator_t<_Range>, _Proj>> _Comp = ranges::less> 44 _LIBCPP_NODISCARD_EXT _LIBCPP_HIDE_FROM_ABI constexpr 45 bool operator()(_Range&& __r, const _Type& __value, _Comp __comp = {}, _Proj __proj = {}) const { 46 auto __first = ranges::begin(__r); 47 auto __last = ranges::end(__r); 48 auto __ret = std::__lower_bound_impl<_RangeAlgPolicy>(__first, __last, __value, __comp, __proj); 49 return __ret != __last && !std::invoke(__comp, __value, std::invoke(__proj, *__ret)); 50 } 51}; 52} // namespace __binary_search 53 54inline namespace __cpo { 55 inline constexpr auto binary_search = __binary_search::__fn{}; 56} // namespace __cpo 57} // namespace ranges 58 59_LIBCPP_END_NAMESPACE_STD 60 61#endif // _LIBCPP_STD_VER > 17 62 63#endif // _LIBCPP___ALGORITHM_RANGES_BINARY_SEARCH_H 64