xref: /llvm-project/libcxx/include/__algorithm/ranges_copy_if.h (revision eab7be5d42ad30c9992ff72c3be9298702001dc8)

//===----------------------------------------------------------------------===//
//
// 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_COPY_IF_H
#define _LIBCPP___ALGORITHM_RANGES_COPY_IF_H

#include <__algorithm/copy_if.h>
#include <__algorithm/in_out_result.h>
#include <__config>
#include <__functional/identity.h>
#include <__functional/invoke.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

_LIBCPP_PUSH_MACROS
#include <__undef_macros>

#if _LIBCPP_STD_VER >= 20

_LIBCPP_BEGIN_NAMESPACE_STD

namespace ranges {

template <class _Ip, class _Op>
using copy_if_result = in_out_result<_Ip, _Op>;

struct __copy_if {
  template <input_iterator _Iter,
            sentinel_for<_Iter> _Sent,
            weakly_incrementable _OutIter,
            class _Proj = identity,
            indirect_unary_predicate<projected<_Iter, _Proj>> _Pred>
    requires indirectly_copyable<_Iter, _OutIter>
  _LIBCPP_HIDE_FROM_ABI constexpr copy_if_result<_Iter, _OutIter>
  operator()(_Iter __first, _Sent __last, _OutIter __result, _Pred __pred, _Proj __proj = {}) const {
    auto __res = std::__copy_if(std::move(__first), std::move(__last), std::move(__result), __pred, __proj);
    return {std::move(__res.first), std::move(__res.second)};
  }

  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 copy_if_result<borrowed_iterator_t<_Range>, _OutIter>
  operator()(_Range&& __r, _OutIter __result, _Pred __pred, _Proj __proj = {}) const {
    auto __res = std::__copy_if(ranges::begin(__r), ranges::end(__r), std::move(__result), __pred, __proj);
    return {std::move(__res.first), std::move(__res.second)};
  }
};

inline namespace __cpo {
inline constexpr auto copy_if = __copy_if{};
} // namespace __cpo
} // namespace ranges

_LIBCPP_END_NAMESPACE_STD

#endif // _LIBCPP_STD_VER >= 20

_LIBCPP_POP_MACROS

#endif // _LIBCPP___ALGORITHM_RANGES_COPY_IF_H