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 
20 int f_called = 0;
21 
22 std::ios_base&
f(std::ios_base & is)23 f(std::ios_base& is)
24 {
25     ++f_called;
26     return is;
27 }
28 
main()29 int main()
30 {
31     {
32         std::istream is((std::streambuf*)0);
33         is >> f;
34         assert(f_called == 1);
35     }
36 }
37