41 lines
1.2 KiB
C++
41 lines
1.2 KiB
C++
// -*- 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_BEGIN_NAMESPACE_STD
|
|
|
|
#if !defined(_LIBCPP_HAS_NO_CONCEPTS)
|
|
|
|
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_CONCEPTS)
|
|
|
|
_LIBCPP_END_NAMESPACE_STD
|
|
|
|
#endif // _LIBCPP___ITERATOR_PROJECTED_H
|