1 //===----------------------------------------------------------------------===//
2 //
3 //                     The LLVM Compiler Infrastructure
4 //
5 // This file is dual licensed under the MIT and the University of Illinois Open
6 // Source Licenses. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 
10 // <iterator>
11 
12 // back_insert_iterator
13 
14 // Test nested types and data member:
15 
16 // template <BackInsertionContainer Cont>
17 // class back_insert_iterator {
18 // protected:
19 //   Cont* container;
20 // public:
21 //   typedef Cont                        container_type;
22 //   typedef void                        value_type;
23 //   typedef void                        difference_type;
24 //   typedef back_insert_iterator<Cont>& reference;
25 //   typedef void                        pointer;
26 // };
27 
28 #include <iterator>
29 #include <type_traits>
30 #include <vector>
31 
32 template <class C>
33 struct find_container
34     : private std::back_insert_iterator<C>
35 {
36     explicit find_container(C& c) : std::back_insert_iterator<C>(c) {}
37     void test() {this->container = 0;}
38 };
39 
40 template <class C>
41 void
42 test()
43 {
44     typedef std::back_insert_iterator<C> R;
45     C c;
46     find_container<C> q(c);
47     q.test();
48     static_assert((std::is_same<typename R::container_type, C>::value), "");
49     static_assert((std::is_same<typename R::value_type, void>::value), "");
50     static_assert((std::is_same<typename R::difference_type, void>::value), "");
51     static_assert((std::is_same<typename R::reference, R&>::value), "");
52     static_assert((std::is_same<typename R::pointer, void>::value), "");
53     static_assert((std::is_same<typename R::iterator_category, std::output_iterator_tag>::value), "");
54 }
55 
56 int main()
57 {
58     test<std::vector<int> >();
59 }
60