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73 lines
2.2 KiB
C++
73 lines
2.2 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_H
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#define _LIBCPP___ALGORITHM_RANGES_GENERATE_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/invoke.h>
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#include <__iterator/concepts.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 <__ranges/dangling.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 >= 20
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_LIBCPP_BEGIN_NAMESPACE_STD
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namespace ranges {
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namespace __generate {
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struct __fn {
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template <class _OutIter, class _Sent, class _Func>
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_LIBCPP_HIDE_FROM_ABI constexpr
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static _OutIter __generate_fn_impl(_OutIter __first, _Sent __last, _Func& __gen) {
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for (; __first != __last; ++__first) {
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*__first = __gen();
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}
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return __first;
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}
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template <input_or_output_iterator _OutIter, sentinel_for<_OutIter> _Sent, 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, _Sent __last, _Func __gen) const {
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return __generate_fn_impl(std::move(__first), std::move(__last), __gen);
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}
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template <class _Range, copy_constructible _Func>
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requires invocable<_Func&> && output_range<_Range, invoke_result_t<_Func&>>
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_LIBCPP_HIDE_FROM_ABI constexpr
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borrowed_iterator_t<_Range> operator()(_Range&& __range, _Func __gen) const {
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return __generate_fn_impl(ranges::begin(__range), ranges::end(__range), __gen);
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}
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};
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} // namespace __generate
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inline namespace __cpo {
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inline constexpr auto generate = __generate::__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 >= 20
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#endif // _LIBCPP___ALGORITHM_RANGES_GENERATE_H
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