44 lines
1.4 KiB
C++
44 lines
1.4 KiB
C++
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//===----------------------------------------------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is dual licensed under the MIT and the University of Illinois Open
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// Source Licenses. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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// <iterator>
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// template<class Iter>
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// struct iterator_traits
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// {
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// typedef typename Iter::difference_type difference_type;
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// typedef typename Iter::value_type value_type;
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// typedef typename Iter::pointer pointer;
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// typedef typename Iter::reference reference;
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// typedef typename Iter::iterator_category iterator_category;
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// };
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#include <iterator>
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#include <type_traits>
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struct A {};
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struct test_iterator
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{
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typedef int difference_type;
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typedef A value_type;
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typedef A* pointer;
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typedef A& reference;
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typedef std::forward_iterator_tag iterator_category;
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};
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int main()
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{
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typedef std::iterator_traits<test_iterator> It;
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static_assert((std::is_same<It::difference_type, int>::value), "");
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static_assert((std::is_same<It::value_type, A>::value), "");
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static_assert((std::is_same<It::pointer, A*>::value), "");
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static_assert((std::is_same<It::iterator_category, std::forward_iterator_tag>::value), "");
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}
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