1fe6060f1SDimitry Andric // -*- C++ -*- 2fe6060f1SDimitry Andric //===----------------------------------------------------------------------===// 3fe6060f1SDimitry Andric // 4fe6060f1SDimitry Andric // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 5fe6060f1SDimitry Andric // See https://llvm.org/LICENSE.txt for license information. 6fe6060f1SDimitry Andric // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 7fe6060f1SDimitry Andric // 8fe6060f1SDimitry Andric //===----------------------------------------------------------------------===// 9*bdd1243dSDimitry Andric 10fe6060f1SDimitry Andric #ifndef _LIBCPP___ITERATOR_PROJECTED_H 11fe6060f1SDimitry Andric #define _LIBCPP___ITERATOR_PROJECTED_H 12fe6060f1SDimitry Andric 13fe6060f1SDimitry Andric #include <__config> 14fe6060f1SDimitry Andric #include <__iterator/concepts.h> 15fe6060f1SDimitry Andric #include <__iterator/incrementable_traits.h> 16*bdd1243dSDimitry Andric #include <__type_traits/remove_cvref.h> 17fe6060f1SDimitry Andric 18fe6060f1SDimitry Andric #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 19fe6060f1SDimitry Andric # pragma GCC system_header 20fe6060f1SDimitry Andric #endif 21fe6060f1SDimitry Andric 22fe6060f1SDimitry Andric _LIBCPP_BEGIN_NAMESPACE_STD 23fe6060f1SDimitry Andric 2481ad6265SDimitry Andric #if _LIBCPP_STD_VER > 17 25fe6060f1SDimitry Andric 26fe6060f1SDimitry Andric template<indirectly_readable _It, indirectly_regular_unary_invocable<_It> _Proj> 27fe6060f1SDimitry Andric struct projected { 28fe6060f1SDimitry Andric using value_type = remove_cvref_t<indirect_result_t<_Proj&, _It>>; 29fe6060f1SDimitry Andric indirect_result_t<_Proj&, _It> operator*() const; // not defined 30fe6060f1SDimitry Andric }; 31fe6060f1SDimitry Andric 32fe6060f1SDimitry Andric template<weakly_incrementable _It, class _Proj> 33fe6060f1SDimitry Andric struct incrementable_traits<projected<_It, _Proj>> { 34fe6060f1SDimitry Andric using difference_type = iter_difference_t<_It>; 35fe6060f1SDimitry Andric }; 36fe6060f1SDimitry Andric 3781ad6265SDimitry Andric #endif // _LIBCPP_STD_VER > 17 38fe6060f1SDimitry Andric 39fe6060f1SDimitry Andric _LIBCPP_END_NAMESPACE_STD 40fe6060f1SDimitry Andric 41fe6060f1SDimitry Andric #endif // _LIBCPP___ITERATOR_PROJECTED_H 42