//===----------------------------------------------------------------------===//
//
// 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___ALGORITHM_RANGES_REMOVE_COPY_H
#define _LIBCPP___ALGORITHM_RANGES_REMOVE_COPY_H

#include <__algorithm/in_out_result.h>
#include <__algorithm/ranges_remove_copy_if.h>
#include <__config>
#include <__functional/identity.h>
#include <__functional/invoke.h>
#include <__functional/ranges_operations.h>
#include <__iterator/concepts.h>
#include <__iterator/projected.h>
#include <__ranges/access.h>
#include <__ranges/concepts.h>
#include <__ranges/dangling.h>
#include <__utility/move.h>

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

#if _LIBCPP_STD_VER >= 20

_LIBCPP_BEGIN_NAMESPACE_STD

namespace ranges {

template <class _InIter, class _OutIter>
using remove_copy_result = in_out_result<_InIter, _OutIter>;

namespace __remove_copy {

  struct __fn {
    template <input_iterator _InIter,
              sentinel_for<_InIter> _Sent,
              weakly_incrementable _OutIter,
              class _Type,
              class _Proj = identity>
      requires indirectly_copyable<_InIter, _OutIter> &&
               indirect_binary_predicate<ranges::equal_to, projected<_InIter, _Proj>, const _Type*>
    _LIBCPP_HIDE_FROM_ABI constexpr remove_copy_result<_InIter, _OutIter>
    operator()(_InIter __first, _Sent __last, _OutIter __result, const _Type& __value, _Proj __proj = {}) const {
      auto __pred = [&](auto&& __val) { return __value == __val; };
      return ranges::__remove_copy_if_impl(std::move(__first), std::move(__last), std::move(__result), __pred, __proj);
    }

    template <input_range _Range, weakly_incrementable _OutIter, class _Type, class _Proj = identity>
      requires indirectly_copyable<iterator_t<_Range>, _OutIter> &&
               indirect_binary_predicate<ranges::equal_to, projected<iterator_t<_Range>, _Proj>, const _Type*>
    _LIBCPP_HIDE_FROM_ABI constexpr remove_copy_result<borrowed_iterator_t<_Range>, _OutIter>
    operator()(_Range&& __range, _OutIter __result, const _Type& __value, _Proj __proj = {}) const {
      auto __pred = [&](auto&& __val) { return __value == __val; };
      return ranges::__remove_copy_if_impl(
          ranges::begin(__range), ranges::end(__range), std::move(__result), __pred, __proj);
    }
  };

} // namespace __remove_copy

inline namespace __cpo {
  inline constexpr auto remove_copy = __remove_copy::__fn{};
} // namespace __cpo
} // namespace ranges

_LIBCPP_END_NAMESPACE_STD

#endif // _LIBCPP_STD_VER >= 20

#endif // _LIBCPP___ALGORITHM_RANGES_REMOVE_COPY_H
