63 lines
1.7 KiB
C++
63 lines
1.7 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef _LIBCPP___ALGORITHM_RANGES_GENERATE_N_H
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#define _LIBCPP___ALGORITHM_RANGES_GENERATE_N_H
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#include <__concepts/constructible.h>
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#include <__concepts/invocable.h>
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#include <__config>
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#include <__functional/identity.h>
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#include <__functional/invoke.h>
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#include <__iterator/concepts.h>
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#include <__iterator/incrementable_traits.h>
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#include <__iterator/iterator_traits.h>
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#include <__ranges/access.h>
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#include <__ranges/concepts.h>
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#include <__utility/move.h>
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#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
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# pragma GCC system_header
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#endif
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#if _LIBCPP_STD_VER > 17 && !defined(_LIBCPP_HAS_NO_INCOMPLETE_RANGES)
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_LIBCPP_BEGIN_NAMESPACE_STD
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namespace ranges {
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namespace __generate_n {
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struct __fn {
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template <input_or_output_iterator _OutIter, copy_constructible _Func>
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requires invocable<_Func&> && indirectly_writable<_OutIter, invoke_result_t<_Func&>>
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_LIBCPP_HIDE_FROM_ABI constexpr
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_OutIter operator()(_OutIter __first, iter_difference_t<_OutIter> __n, _Func __gen) const {
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for (; __n > 0; --__n) {
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*__first = __gen();
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++__first;
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}
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return __first;
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}
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};
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} // namespace __generate_n
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inline namespace __cpo {
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inline constexpr auto generate_n = __generate_n::__fn{};
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} // namespace __cpo
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} // namespace ranges
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_LIBCPP_END_NAMESPACE_STD
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#endif // _LIBCPP_STD_VER > 17 && !defined(_LIBCPP_HAS_NO_INCOMPLETE_RANGES)
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#endif // _LIBCPP___ALGORITHM_RANGES_GENERATE_N_H
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