1753f127fSDimitry Andric //===----------------------------------------------------------------------===// 2753f127fSDimitry Andric // 3753f127fSDimitry Andric // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4753f127fSDimitry Andric // See https://llvm.org/LICENSE.txt for license information. 5753f127fSDimitry Andric // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6753f127fSDimitry Andric // 7753f127fSDimitry Andric //===----------------------------------------------------------------------===// 8753f127fSDimitry Andric 9753f127fSDimitry Andric #ifndef _LIBCPP___ALGORITHM_RANGES_GENERATE_N_H 10753f127fSDimitry Andric #define _LIBCPP___ALGORITHM_RANGES_GENERATE_N_H 11753f127fSDimitry Andric 12753f127fSDimitry Andric #include <__concepts/constructible.h> 13753f127fSDimitry Andric #include <__concepts/invocable.h> 14753f127fSDimitry Andric #include <__config> 15753f127fSDimitry Andric #include <__functional/identity.h> 16753f127fSDimitry Andric #include <__functional/invoke.h> 17753f127fSDimitry Andric #include <__iterator/concepts.h> 18753f127fSDimitry Andric #include <__iterator/incrementable_traits.h> 19753f127fSDimitry Andric #include <__iterator/iterator_traits.h> 20753f127fSDimitry Andric #include <__ranges/access.h> 21753f127fSDimitry Andric #include <__ranges/concepts.h> 22753f127fSDimitry Andric #include <__utility/move.h> 23753f127fSDimitry Andric 24753f127fSDimitry Andric #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 25753f127fSDimitry Andric # pragma GCC system_header 26753f127fSDimitry Andric #endif 27753f127fSDimitry Andric 28*b3edf446SDimitry Andric _LIBCPP_PUSH_MACROS 29*b3edf446SDimitry Andric #include <__undef_macros> 30*b3edf446SDimitry Andric 3106c3fb27SDimitry Andric #if _LIBCPP_STD_VER >= 20 32753f127fSDimitry Andric 33753f127fSDimitry Andric _LIBCPP_BEGIN_NAMESPACE_STD 34753f127fSDimitry Andric 35753f127fSDimitry Andric namespace ranges { 36753f127fSDimitry Andric namespace __generate_n { 37753f127fSDimitry Andric 38753f127fSDimitry Andric struct __fn { 39753f127fSDimitry Andric template <input_or_output_iterator _OutIter, copy_constructible _Func> 40753f127fSDimitry Andric requires invocable<_Func&> && indirectly_writable<_OutIter, invoke_result_t<_Func&>> 4106c3fb27SDimitry Andric _LIBCPP_HIDE_FROM_ABI constexpr _OutIter operator__fn4206c3fb27SDimitry Andric operator()(_OutIter __first, iter_difference_t<_OutIter> __n, _Func __gen) const { 43972a253aSDimitry Andric for (; __n > 0; --__n) { 44972a253aSDimitry Andric *__first = __gen(); 45972a253aSDimitry Andric ++__first; 46972a253aSDimitry Andric } 47972a253aSDimitry Andric 48972a253aSDimitry Andric return __first; 49753f127fSDimitry Andric } 50753f127fSDimitry Andric }; 51753f127fSDimitry Andric 52753f127fSDimitry Andric } // namespace __generate_n 53753f127fSDimitry Andric 54753f127fSDimitry Andric inline namespace __cpo { 55753f127fSDimitry Andric inline constexpr auto generate_n = __generate_n::__fn{}; 56753f127fSDimitry Andric } // namespace __cpo 57753f127fSDimitry Andric } // namespace ranges 58753f127fSDimitry Andric 59753f127fSDimitry Andric _LIBCPP_END_NAMESPACE_STD 60753f127fSDimitry Andric 6106c3fb27SDimitry Andric #endif // _LIBCPP_STD_VER >= 20 62753f127fSDimitry Andric 63*b3edf446SDimitry Andric _LIBCPP_POP_MACROS 64*b3edf446SDimitry Andric 65753f127fSDimitry Andric #endif // _LIBCPP___ALGORITHM_RANGES_GENERATE_N_H 66