| // -*- C++ -*- |
| //===----------------------------------------------------------------------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| #ifndef _LIBCPP___ITERATOR_PROJECTED_H |
| #define _LIBCPP___ITERATOR_PROJECTED_H |
| |
| #include <__config> |
| #include <__iterator/concepts.h> |
| #include <__iterator/incrementable_traits.h> |
| #include <type_traits> |
| |
| #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) |
| #pragma GCC system_header |
| #endif |
| |
| _LIBCPP_PUSH_MACROS |
| #include <__undef_macros> |
| |
| _LIBCPP_BEGIN_NAMESPACE_STD |
| |
| #if !defined(_LIBCPP_HAS_NO_RANGES) |
| |
| template<indirectly_readable _It, indirectly_regular_unary_invocable<_It> _Proj> |
| struct projected { |
| using value_type = remove_cvref_t<indirect_result_t<_Proj&, _It>>; |
| indirect_result_t<_Proj&, _It> operator*() const; // not defined |
| }; |
| |
| template<weakly_incrementable _It, class _Proj> |
| struct incrementable_traits<projected<_It, _Proj>> { |
| using difference_type = iter_difference_t<_It>; |
| }; |
| |
| #endif // !defined(_LIBCPP_HAS_NO_RANGES) |
| |
| _LIBCPP_END_NAMESPACE_STD |
| |
| _LIBCPP_POP_MACROS |
| |
| #endif // _LIBCPP___ITERATOR_PROJECTED_H |
