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| 1 | //===----------------------------------------------------------------------===// |
|---|---|
| 2 | // |
| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| 4 | // See https://llvm.org/LICENSE.txt for license information. |
| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| 6 | // |
| 7 | //===----------------------------------------------------------------------===// |
| 8 | |
| 9 | #ifndef _LIBCPP___ALGORITHM_RANGES_GENERATE_N_H |
| 10 | #define _LIBCPP___ALGORITHM_RANGES_GENERATE_N_H |
| 11 | |
| 12 | #include <__concepts/constructible.h> |
| 13 | #include <__concepts/invocable.h> |
| 14 | #include <__config> |
| 15 | #include <__functional/identity.h> |
| 16 | #include <__iterator/concepts.h> |
| 17 | #include <__iterator/incrementable_traits.h> |
| 18 | #include <__iterator/iterator_traits.h> |
| 19 | #include <__ranges/access.h> |
| 20 | #include <__ranges/concepts.h> |
| 21 | #include <__type_traits/invoke.h> |
| 22 | #include <__utility/move.h> |
| 23 | |
| 24 | #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) |
| 25 | # pragma GCC system_header |
| 26 | #endif |
| 27 | |
| 28 | _LIBCPP_PUSH_MACROS |
| 29 | #include <__undef_macros> |
| 30 | |
| 31 | #if _LIBCPP_STD_VER >= 20 |
| 32 | |
| 33 | _LIBCPP_BEGIN_NAMESPACE_STD |
| 34 | |
| 35 | namespace ranges { |
| 36 | struct __generate_n { |
| 37 | template <input_or_output_iterator _OutIter, copy_constructible _Func> |
| 38 | requires invocable<_Func&> && indirectly_writable<_OutIter, invoke_result_t<_Func&>> |
| 39 | _LIBCPP_HIDE_FROM_ABI constexpr _OutIter |
| 40 | operator()(_OutIter __first, iter_difference_t<_OutIter> __n, _Func __gen) const { |
| 41 | for (; __n > 0; --__n) { |
| 42 | *__first = __gen(); |
| 43 | ++__first; |
| 44 | } |
| 45 | |
| 46 | return __first; |
| 47 | } |
| 48 | }; |
| 49 | |
| 50 | inline namespace __cpo { |
| 51 | inline constexpr auto generate_n = __generate_n{}; |
| 52 | } // namespace __cpo |
| 53 | } // namespace ranges |
| 54 | |
| 55 | _LIBCPP_END_NAMESPACE_STD |
| 56 | |
| 57 | #endif // _LIBCPP_STD_VER >= 20 |
| 58 | |
| 59 | _LIBCPP_POP_MACROS |
| 60 | |
| 61 | #endif // _LIBCPP___ALGORITHM_RANGES_GENERATE_N_H |
| 62 |
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