libcxx/include/__cxx03/__algorithm/adjacent_find.h

   1 // -*- C++ -*-
   2 //===----------------------------------------------------------------------===//
   3 //
   4 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   5 // See https://llvm.org/LICENSE.txt for license information.
   6 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   7 //
   8 //===----------------------------------------------------------------------===//
   9
  10 #ifndef _LIBCPP___ALGORITHM_ADJACENT_FIND_H
  11 #define _LIBCPP___ALGORITHM_ADJACENT_FIND_H
  12
  13 #include <__cxx03/__algorithm/comp.h>
  14 #include <__cxx03/__algorithm/iterator_operations.h>
  15 #include <__cxx03/__config>
  16 #include <__cxx03/__iterator/iterator_traits.h>
  17 #include <__cxx03/__utility/move.h>
  18
  19 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
  20 #  pragma GCC system_header
  21 #endif
  22
  23 _LIBCPP_PUSH_MACROS
  24 #include <__cxx03/__undef_macros>
  25
  26 _LIBCPP_BEGIN_NAMESPACE_STD
  27
  28 template <class _Iter, class _Sent, class _BinaryPredicate>
  29 _LIBCPP_NODISCARD _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _Iter
  30 __adjacent_find(_Iter __first, _Sent __last, _BinaryPredicate&& __pred) {
  31   if (__first == __last)
  32     return __first;
  33   _Iter __i = __first;
  34   while (++__i != __last) {
  35     if (__pred(*__first, *__i))
  36       return __first;
  37     __first = __i;
  38   }
  39   return __i;
  40 }
  41
  42 template <class _ForwardIterator, class _BinaryPredicate>
  43 _LIBCPP_NODISCARD inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _ForwardIterator
  44 adjacent_find(_ForwardIterator __first, _ForwardIterator __last, _BinaryPredicate __pred) {
  45   return std::__adjacent_find(std::move(__first), std::move(__last), __pred);
  46 }
  47
  48 template <class _ForwardIterator>
  49 _LIBCPP_NODISCARD inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _ForwardIterator
  50 adjacent_find(_ForwardIterator __first, _ForwardIterator __last) {
  51   return std::adjacent_find(std::move(__first), std::move(__last), __equal_to());
  52 }
  53
  54 _LIBCPP_END_NAMESPACE_STD
  55
  56 _LIBCPP_POP_MACROS
  57
  58 #endif // _LIBCPP___ALGORITHM_ADJACENT_FIND_H