43 lines · cpp
1//===----------------------------------------------------------------------===//2//3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.4// See https://llvm.org/LICENSE.txt for license information.5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception6//7//===----------------------------------------------------------------------===//8 9// <iterator>10 11// template<class T>12// struct iterator_traits<T*>13// {14// typedef ptrdiff_t difference_type;15// typedef T value_type;16// typedef T* pointer;17// typedef T& reference;18// typedef random_access_iterator_tag iterator_category;19// typedef contiguous_iterator_tag iterator_category; // C++2020// };21 22#include <iterator>23#include <cstddef>24#include <type_traits>25 26#include "test_macros.h"27 28struct A {};29 30int main(int, char**)31{32 typedef std::iterator_traits<A*> It;33 static_assert((std::is_same<It::difference_type, std::ptrdiff_t>::value), "");34 static_assert((std::is_same<It::value_type, A>::value), "");35 static_assert((std::is_same<It::pointer, A*>::value), "");36 static_assert((std::is_same<It::reference, A&>::value), "");37 static_assert((std::is_same<It::iterator_category, std::random_access_iterator_tag>::value), "");38#if TEST_STD_VER > 1739 ASSERT_SAME_TYPE(It::iterator_concept, std::contiguous_iterator_tag);40#endif41 return 0;42}43