//===----------------------------------------------------------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
//==============================================================================
// NOTICE: This file has been modified by Green Hills Software, Inc.  Such
// modifications are subject to copyright by Green Hills Software, Inc.  See the
// "Green Hills Software Modifications" section in the LICENSE.txt included with
// this distribution for more information.
//==============================================================================

#ifndef _LIBCPP___ALGORITHM_RANGES_GENERATE_N_H
#define _LIBCPP___ALGORITHM_RANGES_GENERATE_N_H

#include <__concepts/constructible.h>
#include <__concepts/invocable.h>
#include <__config>
#include <__functional/identity.h>
#include <__functional/invoke.h>
#include <__iterator/concepts.h>
#include <__iterator/incrementable_traits.h>
#include <__iterator/iterator_traits.h>
#include <__ranges/access.h>
#include <__ranges/concepts.h>
#include <__utility/move.h>

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

#if _LIBCPP_STD_VER > 17

#if defined(__ghs__)
  #pragma ghs start_cxx_lib_header
  #pragma ghs startdata
  #if defined(__ghs_max_pack_value)
    #pragma pack (push, __ghs_max_pack_value)
  #endif
#endif

_LIBCPP_BEGIN_NAMESPACE_STD

namespace ranges {
namespace __generate_n {

struct __fn {

  template <input_or_output_iterator _OutIter, copy_constructible _Func>
  requires invocable<_Func&> && indirectly_writable<_OutIter, invoke_result_t<_Func&>>
  _LIBCPP_HIDE_FROM_ABI constexpr
  _OutIter operator()(_OutIter __first, iter_difference_t<_OutIter> __n, _Func __gen) const {
    for (; __n > 0; --__n) {
      *__first = __gen();
      ++__first;
    }

    return __first;
  }

};

} // namespace __generate_n

inline namespace __cpo {
  inline constexpr auto generate_n = __generate_n::__fn{};
} // namespace __cpo
} // namespace ranges

_LIBCPP_END_NAMESPACE_STD

#if defined(__ghs__)
  #if defined(__ghs_max_pack_value)
    #pragma pack(pop)
  #endif
  #pragma ghs enddata
  #pragma ghs end_cxx_lib_header
#endif

#endif // _LIBCPP_STD_VER > 17

#endif // _LIBCPP___ALGORITHM_RANGES_GENERATE_N_H