chromium/third_party/libc++/src/include/__iterator/incrementable_traits.h

// -*- 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_INCREMENTABLE_TRAITS_H
#define _LIBCPP___ITERATOR_INCREMENTABLE_TRAITS_H

#include <__concepts/arithmetic.h>
#include <__config>
#include <__type_traits/conditional.h>
#include <__type_traits/is_object.h>
#include <__type_traits/is_primary_template.h>
#include <__type_traits/make_signed.h>
#include <__type_traits/remove_cvref.h>
#include <__utility/declval.h>
#include <cstddef>

#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
#  pragma GCC system_header
#endif

_LIBCPP_BEGIN_NAMESPACE_STD

#if _LIBCPP_STD_VER >= 20

// [incrementable.traits]
template <class>
struct incrementable_traits { … };

incrementable_traits<_Tp *>;

incrementable_traits<const _Ip>;

__has_member_difference_type;

incrementable_traits<_Tp>;

__has_integral_minus;

incrementable_traits<_Tp>;

template <class>
struct iterator_traits;

// Let `RI` be `remove_cvref_t<I>`. The type `iter_difference_t<I>` denotes
// `incrementable_traits<RI>::difference_type` if `iterator_traits<RI>` names a specialization
// generated from the primary template, and `iterator_traits<RI>::difference_type` otherwise.
iter_difference_t;

#endif // _LIBCPP_STD_VER >= 20

_LIBCPP_END_NAMESPACE_STD

#endif // _LIBCPP___ITERATOR_INCREMENTABLE_TRAITS_H