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//===----------------------------------------------------------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
// <iterator>
// template<class Iter>
// struct iterator_traits
// {
// typedef typename Iter::difference_type difference_type;
// typedef typename Iter::value_type value_type;
// typedef typename Iter::pointer pointer;
// typedef typename Iter::reference reference;
// typedef typename Iter::iterator_category iterator_category;
// };
#include <iterator>
#include <type_traits>
struct A {};
struct test_iterator
{
typedef int difference_type;
typedef A value_type;
typedef A* pointer;
typedef A& reference;
typedef std::forward_iterator_tag iterator_category;
};
int main()
{
typedef std::iterator_traits<test_iterator> It;
static_assert((std::is_same<It::difference_type, int>::value), "");
static_assert((std::is_same<It::value_type, A>::value), "");
static_assert((std::is_same<It::pointer, A*>::value), "");
static_assert((std::is_same<It::reference, A&>::value), "");
static_assert((std::is_same<It::iterator_category, std::forward_iterator_tag>::value), "");
}
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