//===----------------------------------------------------------------------===//
//
// 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_REMOVE_COPY_IF_H
#define _LIBCPP___CXX03___ALGORITHM_RANGES_REMOVE_COPY_IF_H

#include <__cxx03/__algorithm/in_out_result.h>
#include <__cxx03/__algorithm/make_projected.h>
#include <__cxx03/__algorithm/remove_copy_if.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/iterator_traits.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 {

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

template <class _InIter, class _Sent, class _OutIter, class _Proj, class _Pred>
_LIBCPP_HIDE_FROM_ABI constexpr in_out_result<_InIter, _OutIter>
__remove_copy_if_impl(_InIter __first, _Sent __last, _OutIter __result, _Pred& __pred, _Proj& __proj) {
  for (; __first != __last; ++__first) {
    if (!std::invoke(__pred, std::invoke(__proj, *__first))) {
      *__result = *__first;
      ++__result;
    }
  }
  return {std::move(__first), std::move(__result)};
}

namespace __remove_copy_if {

struct __fn {
  template <input_iterator _InIter,
            sentinel_for<_InIter> _Sent,
            weakly_incrementable _OutIter,
            class _Proj = identity,
            indirect_unary_predicate<projected<_InIter, _Proj>> _Pred>
    requires indirectly_copyable<_InIter, _OutIter>
  _LIBCPP_HIDE_FROM_ABI constexpr remove_copy_if_result<_InIter, _OutIter>
  operator()(_InIter __first, _Sent __last, _OutIter __result, _Pred __pred, _Proj __proj = {}) const {
    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 _Proj = identity,
            indirect_unary_predicate<projected<iterator_t<_Range>, _Proj>> _Pred>
    requires indirectly_copyable<iterator_t<_Range>, _OutIter>
  _LIBCPP_HIDE_FROM_ABI constexpr remove_copy_if_result<borrowed_iterator_t<_Range>, _OutIter>
  operator()(_Range&& __range, _OutIter __result, _Pred __pred, _Proj __proj = {}) const {
    return ranges::__remove_copy_if_impl(
        ranges::begin(__range), ranges::end(__range), std::move(__result), __pred, __proj);
  }
};

} // namespace __remove_copy_if

inline namespace __cpo {
inline constexpr auto remove_copy_if = __remove_copy_if::__fn{};
} // namespace __cpo
} // namespace ranges

_LIBCPP_END_NAMESPACE_STD

#endif // _LIBCPP_STD_VER >= 20

_LIBCPP_POP_MACROS

#endif // _LIBCPP___CXX03___ALGORITHM_RANGES_REMOVE_COPY_IF_H
