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// template <class T, class charT = char, class traits = char_traits<charT>,
13//           class Distance = ptrdiff_t>
14// class istream_iterator
15//     : public iterator<input_iterator_tag, T, Distance, const T*, const T&>
16// {
17// public:
18//     typedef charT char_type;
19//     typedef traits traits_type;
20//     typedef basic_istream<charT,traits> istream_type;
21//     ...
22
23#include <iterator>
24#include <type_traits>
25
26int main()
27{
28    typedef std::istream_iterator<double> I1;
29    static_assert((std::is_convertible<I1,
30        std::iterator<std::input_iterator_tag, double, std::ptrdiff_t,
31        const double*, const double&> >::value), "");
32    static_assert((std::is_same<I1::char_type, char>::value), "");
33    static_assert((std::is_same<I1::traits_type, std::char_traits<char> >::value), "");
34    static_assert((std::is_same<I1::istream_type, std::istream>::value), "");
35    typedef std::istream_iterator<unsigned, wchar_t> I2;
36    static_assert((std::is_convertible<I2,
37        std::iterator<std::input_iterator_tag, unsigned, std::ptrdiff_t,
38        const unsigned*, const unsigned&> >::value), "");
39    static_assert((std::is_same<I2::char_type, wchar_t>::value), "");
40    static_assert((std::is_same<I2::traits_type, std::char_traits<wchar_t> >::value), "");
41    static_assert((std::is_same<I2::istream_type, std::wistream>::value), "");
42}
43