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 //===----------------------------------------------------------------------===// 9fe6060f1SDimitry Andric #ifndef _LIBCPP___ITERATOR_PROJECTED_H 10fe6060f1SDimitry Andric #define _LIBCPP___ITERATOR_PROJECTED_H 11fe6060f1SDimitry Andric 12fe6060f1SDimitry Andric #include <__config> 13fe6060f1SDimitry Andric #include <__iterator/concepts.h> 14fe6060f1SDimitry Andric #include <__iterator/incrementable_traits.h> 15fe6060f1SDimitry Andric #include <type_traits> 16fe6060f1SDimitry Andric 17fe6060f1SDimitry Andric #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 18fe6060f1SDimitry Andric # pragma GCC system_header 19fe6060f1SDimitry Andric #endif 20fe6060f1SDimitry Andric 21fe6060f1SDimitry Andric _LIBCPP_BEGIN_NAMESPACE_STD 22fe6060f1SDimitry Andric 23*81ad6265SDimitry Andric #if _LIBCPP_STD_VER > 17 24fe6060f1SDimitry Andric 25fe6060f1SDimitry Andric template<indirectly_readable _It, indirectly_regular_unary_invocable<_It> _Proj> 26fe6060f1SDimitry Andric struct projected { 27fe6060f1SDimitry Andric using value_type = remove_cvref_t<indirect_result_t<_Proj&, _It>>; 28fe6060f1SDimitry Andric indirect_result_t<_Proj&, _It> operator*() const; // not defined 29fe6060f1SDimitry Andric }; 30fe6060f1SDimitry Andric 31fe6060f1SDimitry Andric template<weakly_incrementable _It, class _Proj> 32fe6060f1SDimitry Andric struct incrementable_traits<projected<_It, _Proj>> { 33fe6060f1SDimitry Andric using difference_type = iter_difference_t<_It>; 34fe6060f1SDimitry Andric }; 35fe6060f1SDimitry Andric 36*81ad6265SDimitry Andric #endif // _LIBCPP_STD_VER > 17 37fe6060f1SDimitry Andric 38fe6060f1SDimitry Andric _LIBCPP_END_NAMESPACE_STD 39fe6060f1SDimitry Andric 40fe6060f1SDimitry Andric #endif // _LIBCPP___ITERATOR_PROJECTED_H 41