libcxx/include/__algorithm/binary_search.h

   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_BINARY_SEARCH_H
  10 #define _LIBCPP___ALGORITHM_BINARY_SEARCH_H
  11
  12 #include <__algorithm/comp.h>
  13 #include <__algorithm/comp_ref_type.h>
  14 #include <__algorithm/lower_bound.h>
  15 #include <__config>
  16 #include <__iterator/iterator_traits.h>
  17
  18 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
  19 #  pragma GCC system_header
  20 #endif
  21
  22 _LIBCPP_BEGIN_NAMESPACE_STD
  23
  24 template <class _ForwardIterator, class _Tp, class _Compare>
  25 _LIBCPP_NODISCARD_EXT inline
  26 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20
  27 bool
  28 binary_search(_ForwardIterator __first, _ForwardIterator __last, const _Tp& __value, _Compare __comp)
  29 {
  30     __first = std::lower_bound<_ForwardIterator, _Tp, __comp_ref_type<_Compare> >(__first, __last, __value, __comp);
  31     return __first != __last && !__comp(__value, *__first);
  32 }
  33
  34 template <class _ForwardIterator, class _Tp>
  35 _LIBCPP_NODISCARD_EXT inline
  36 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20
  37 bool
  38 binary_search(_ForwardIterator __first, _ForwardIterator __last, const _Tp& __value)
  39 {
  40     return std::binary_search(__first, __last, __value, __less<>());
  41 }
  42
  43 _LIBCPP_END_NAMESPACE_STD
  44
  45 #endif // _LIBCPP___ALGORITHM_BINARY_SEARCH_H