libcxx/include/__functional/default_searcher.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___FUNCTIONAL_DEFAULT_SEARCHER_H
  11 #define _LIBCPP___FUNCTIONAL_DEFAULT_SEARCHER_H
  12
  13 #include <__algorithm/search.h>
  14 #include <__config>
  15 #include <__functional/identity.h>
  16 #include <__functional/operations.h>
  17 #include <__iterator/iterator_traits.h>
  18 #include <__utility/pair.h>
  19
  20 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
  21 #  pragma GCC system_header
  22 #endif
  23
  24 _LIBCPP_BEGIN_NAMESPACE_STD
  25
  26 #if _LIBCPP_STD_VER >= 17
  27
  28 // default searcher
  29 template <class _ForwardIterator, class _BinaryPredicate = equal_to<>>
  30 class _LIBCPP_TEMPLATE_VIS default_searcher {
  31 public:
  32   _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20
  33   default_searcher(_ForwardIterator __f, _ForwardIterator __l, _BinaryPredicate __p = _BinaryPredicate())
  34       : __first_(__f), __last_(__l), __pred_(__p) {}
  35
  36   template <typename _ForwardIterator2>
  37   _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 pair<_ForwardIterator2, _ForwardIterator2>
  38   operator()(_ForwardIterator2 __f, _ForwardIterator2 __l) const {
  39     auto __proj = __identity();
  40     return std::__search_impl(__f, __l, __first_, __last_, __pred_, __proj, __proj);
  41   }
  42
  43 private:
  44   _ForwardIterator __first_;
  45   _ForwardIterator __last_;
  46   _BinaryPredicate __pred_;
  47 };
  48 _LIBCPP_CTAD_SUPPORTED_FOR_TYPE(default_searcher);
  49
  50 #endif // _LIBCPP_STD_VER >= 17
  51
  52 _LIBCPP_END_NAMESPACE_STD
  53
  54 #endif // _LIBCPP___FUNCTIONAL_DEFAULT_SEARCHER_H