| //===----------------------------------------------------------------------===// |
| // |
| // 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_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 |
| |
| _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 |
| |
| #endif // _LIBCPP_STD_VER > 17 |
| |
| #endif // _LIBCPP___ALGORITHM_RANGES_GENERATE_N_H |
