xref: /llvm-project/libcxx/include/__cxx03/__algorithm/ranges_find.h (revision ce7771902dc50d900de639d499a60486b83f70e0)

//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

#ifndef _LIBCPP___CXX03___ALGORITHM_RANGES_FIND_H
#define _LIBCPP___CXX03___ALGORITHM_RANGES_FIND_H

#include <__cxx03/__algorithm/find.h>
#include <__cxx03/__algorithm/ranges_find_if.h>
#include <__cxx03/__algorithm/unwrap_range.h>
#include <__cxx03/__config>
#include <__cxx03/__functional/identity.h>
#include <__cxx03/__functional/invoke.h>
#include <__cxx03/__functional/ranges_operations.h>
#include <__cxx03/__iterator/concepts.h>
#include <__cxx03/__iterator/projected.h>
#include <__cxx03/__ranges/access.h>
#include <__cxx03/__ranges/concepts.h>
#include <__cxx03/__ranges/dangling.h>
#include <__cxx03/__utility/forward.h>
#include <__cxx03/__utility/move.h>

#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
#  pragma GCC system_header
#endif

_LIBCPP_PUSH_MACROS
#include <__cxx03/__undef_macros>

#if _LIBCPP_STD_VER >= 20

_LIBCPP_BEGIN_NAMESPACE_STD

namespace ranges {
namespace __find {
struct __fn {
  template <class _Iter, class _Sent, class _Tp, class _Proj>
  _LIBCPP_HIDE_FROM_ABI static constexpr _Iter
  __find_unwrap(_Iter __first, _Sent __last, const _Tp& __value, _Proj& __proj) {
    if constexpr (forward_iterator<_Iter>) {
      auto [__first_un, __last_un] = std::__unwrap_range(__first, std::move(__last));
      return std::__rewrap_range<_Sent>(
          std::move(__first), std::__find(std::move(__first_un), std::move(__last_un), __value, __proj));
    } else {
      return std::__find(std::move(__first), std::move(__last), __value, __proj);
    }
  }

  template <input_iterator _Ip, sentinel_for<_Ip> _Sp, class _Tp, class _Proj = identity>
    requires indirect_binary_predicate<ranges::equal_to, projected<_Ip, _Proj>, const _Tp*>
  [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr _Ip
  operator()(_Ip __first, _Sp __last, const _Tp& __value, _Proj __proj = {}) const {
    return __find_unwrap(std::move(__first), std::move(__last), __value, __proj);
  }

  template <input_range _Rp, class _Tp, class _Proj = identity>
    requires indirect_binary_predicate<ranges::equal_to, projected<iterator_t<_Rp>, _Proj>, const _Tp*>
  [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr borrowed_iterator_t<_Rp>
  operator()(_Rp&& __r, const _Tp& __value, _Proj __proj = {}) const {
    return __find_unwrap(ranges::begin(__r), ranges::end(__r), __value, __proj);
  }
};
} // namespace __find

inline namespace __cpo {
inline constexpr auto find = __find::__fn{};
} // namespace __cpo
} // namespace ranges

_LIBCPP_END_NAMESPACE_STD

#endif // _LIBCPP_STD_VER >= 20

_LIBCPP_POP_MACROS

#endif // _LIBCPP___CXX03___ALGORITHM_RANGES_FIND_H