__cxx03/__algorithm/ranges_binary_search.h

0001 //===----------------------------------------------------------------------===//
0002 //
0003 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
0004 // See https://llvm.org/LICENSE.txt for license information.
0005 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
0006 //
0007 //===----------------------------------------------------------------------===//
0008
0009 #ifndef _LIBCPP___CXX03___ALGORITHM_RANGES_BINARY_SEARCH_H
0010 #define _LIBCPP___CXX03___ALGORITHM_RANGES_BINARY_SEARCH_H
0011
0012 #include <__cxx03/__algorithm/iterator_operations.h>
0013 #include <__cxx03/__algorithm/lower_bound.h>
0014 #include <__cxx03/__config>
0015 #include <__cxx03/__functional/identity.h>
0016 #include <__cxx03/__functional/invoke.h>
0017 #include <__cxx03/__functional/ranges_operations.h>
0018 #include <__cxx03/__iterator/concepts.h>
0019 #include <__cxx03/__iterator/projected.h>
0020 #include <__cxx03/__ranges/access.h>
0021 #include <__cxx03/__ranges/concepts.h>
0022
0023 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
0024 #  pragma GCC system_header
0025 #endif
0026
0027 _LIBCPP_PUSH_MACROS
0028 #include <__cxx03/__undef_macros>
0029
0030 #if _LIBCPP_STD_VER >= 20
0031
0032 _LIBCPP_BEGIN_NAMESPACE_STD
0033
0034 namespace ranges {
0035 namespace __binary_search {
0036 struct __fn {
0037   template <forward_iterator _Iter,
0038             sentinel_for<_Iter> _Sent,
0039             class _Type,
0040             class _Proj                                                             = identity,
0041             indirect_strict_weak_order<const _Type*, projected<_Iter, _Proj>> _Comp = ranges::less>
0042   [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr bool
0043   operator()(_Iter __first, _Sent __last, const _Type& __value, _Comp __comp = {}, _Proj __proj = {}) const {
0044     auto __ret = std::__lower_bound<_RangeAlgPolicy>(__first, __last, __value, __comp, __proj);
0045     return __ret != __last && !std::invoke(__comp, __value, std::invoke(__proj, *__ret));
0046   }
0047
0048   template <forward_range _Range,
0049             class _Type,
0050             class _Proj                                                                          = identity,
0051             indirect_strict_weak_order<const _Type*, projected<iterator_t<_Range>, _Proj>> _Comp = ranges::less>
0052   [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr bool
0053   operator()(_Range&& __r, const _Type& __value, _Comp __comp = {}, _Proj __proj = {}) const {
0054     auto __first = ranges::begin(__r);
0055     auto __last  = ranges::end(__r);
0056     auto __ret   = std::__lower_bound<_RangeAlgPolicy>(__first, __last, __value, __comp, __proj);
0057     return __ret != __last && !std::invoke(__comp, __value, std::invoke(__proj, *__ret));
0058   }
0059 };
0060 } // namespace __binary_search
0061
0062 inline namespace __cpo {
0063 inline constexpr auto binary_search = __binary_search::__fn{};
0064 } // namespace __cpo
0065 } // namespace ranges
0066
0067 _LIBCPP_END_NAMESPACE_STD
0068
0069 #endif // _LIBCPP_STD_VER >= 20
0070
0071 _LIBCPP_POP_MACROS
0072
0073 #endif // _LIBCPP___CXX03___ALGORITHM_RANGES_BINARY_SEARCH_H