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// <istream>
11
12// template <class charT, class traits = char_traits<charT> >
13//   class basic_istream;
14
15// basic_istream<charT,traits>& operator>>(ios_base& (*pf)(ios_base&));
16
17#include <istream>
18#include <cassert>
19
20int f_called = 0;
21
22std::ios_base&
23f(std::ios_base& is)
24{
25    ++f_called;
26    return is;
27}
28
29int main()
30{
31    {
32        std::istream is((std::streambuf*)0);
33        is >> f;
34        assert(f_called == 1);
35    }
36}
37