181ad6265SDimitry Andric //===----------------------------------------------------------------------===// 281ad6265SDimitry Andric // 381ad6265SDimitry Andric // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 481ad6265SDimitry Andric // See https://llvm.org/LICENSE.txt for license information. 581ad6265SDimitry Andric // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 681ad6265SDimitry Andric // 781ad6265SDimitry Andric //===----------------------------------------------------------------------===// 881ad6265SDimitry Andric 981ad6265SDimitry Andric #ifndef _LIBCPP___ALGORITHM_RANGES_COPY_N_H 1081ad6265SDimitry Andric #define _LIBCPP___ALGORITHM_RANGES_COPY_N_H 1181ad6265SDimitry Andric 1281ad6265SDimitry Andric #include <__algorithm/copy.h> 1381ad6265SDimitry Andric #include <__algorithm/in_out_result.h> 14bdd1243dSDimitry Andric #include <__algorithm/iterator_operations.h> 1581ad6265SDimitry Andric #include <__algorithm/ranges_copy.h> 1681ad6265SDimitry Andric #include <__config> 1781ad6265SDimitry Andric #include <__functional/identity.h> 1881ad6265SDimitry Andric #include <__iterator/concepts.h> 1981ad6265SDimitry Andric #include <__iterator/incrementable_traits.h> 2081ad6265SDimitry Andric #include <__iterator/unreachable_sentinel.h> 2181ad6265SDimitry Andric #include <__iterator/wrap_iter.h> 2281ad6265SDimitry Andric #include <__utility/move.h> 2381ad6265SDimitry Andric 2481ad6265SDimitry Andric #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 2581ad6265SDimitry Andric # pragma GCC system_header 2681ad6265SDimitry Andric #endif 2781ad6265SDimitry Andric 28*b3edf446SDimitry Andric _LIBCPP_PUSH_MACROS 29*b3edf446SDimitry Andric #include <__undef_macros> 30*b3edf446SDimitry Andric 3181ad6265SDimitry Andric _LIBCPP_BEGIN_NAMESPACE_STD 3281ad6265SDimitry Andric 3306c3fb27SDimitry Andric #if _LIBCPP_STD_VER >= 20 3481ad6265SDimitry Andric 3581ad6265SDimitry Andric namespace ranges { 3681ad6265SDimitry Andric 3781ad6265SDimitry Andric template <class _Ip, class _Op> 3881ad6265SDimitry Andric using copy_n_result = in_out_result<_Ip, _Op>; 3981ad6265SDimitry Andric 4081ad6265SDimitry Andric namespace __copy_n { 4181ad6265SDimitry Andric struct __fn { 4281ad6265SDimitry Andric template <class _InIter, class _DiffType, class _OutIter> 4306c3fb27SDimitry Andric _LIBCPP_HIDE_FROM_ABI constexpr static copy_n_result<_InIter, _OutIter> __go__fn4406c3fb27SDimitry Andric __go(_InIter __first, _DiffType __n, _OutIter __result) { 4581ad6265SDimitry Andric while (__n != 0) { 4681ad6265SDimitry Andric *__result = *__first; 4781ad6265SDimitry Andric ++__first; 4881ad6265SDimitry Andric ++__result; 4981ad6265SDimitry Andric --__n; 5081ad6265SDimitry Andric } 5181ad6265SDimitry Andric return {std::move(__first), std::move(__result)}; 5281ad6265SDimitry Andric } 5381ad6265SDimitry Andric 5481ad6265SDimitry Andric template <random_access_iterator _InIter, class _DiffType, random_access_iterator _OutIter> 5506c3fb27SDimitry Andric _LIBCPP_HIDE_FROM_ABI constexpr static copy_n_result<_InIter, _OutIter> __go__fn5606c3fb27SDimitry Andric __go(_InIter __first, _DiffType __n, _OutIter __result) { 57bdd1243dSDimitry Andric auto __ret = std::__copy<_RangeAlgPolicy>(__first, __first + __n, __result); 5881ad6265SDimitry Andric return {__ret.first, __ret.second}; 5981ad6265SDimitry Andric } 6081ad6265SDimitry Andric 6181ad6265SDimitry Andric template <input_iterator _Ip, weakly_incrementable _Op> 6281ad6265SDimitry Andric requires indirectly_copyable<_Ip, _Op> 6306c3fb27SDimitry Andric _LIBCPP_HIDE_FROM_ABI constexpr copy_n_result<_Ip, _Op> operator__fn6406c3fb27SDimitry Andric operator()(_Ip __first, iter_difference_t<_Ip> __n, _Op __result) const { 6581ad6265SDimitry Andric return __go(std::move(__first), __n, std::move(__result)); 6681ad6265SDimitry Andric } 6781ad6265SDimitry Andric }; 6881ad6265SDimitry Andric } // namespace __copy_n 6981ad6265SDimitry Andric 7081ad6265SDimitry Andric inline namespace __cpo { 7181ad6265SDimitry Andric inline constexpr auto copy_n = __copy_n::__fn{}; 7281ad6265SDimitry Andric } // namespace __cpo 7381ad6265SDimitry Andric } // namespace ranges 7481ad6265SDimitry Andric 7506c3fb27SDimitry Andric #endif // _LIBCPP_STD_VER >= 20 7681ad6265SDimitry Andric 7781ad6265SDimitry Andric _LIBCPP_END_NAMESPACE_STD 7881ad6265SDimitry Andric 79*b3edf446SDimitry Andric _LIBCPP_POP_MACROS 80*b3edf446SDimitry Andric 8181ad6265SDimitry Andric #endif // _LIBCPP___ALGORITHM_RANGES_COPY_N_H 82