libcxx/test/std/input.output/iostream.format/input.streams/istream.formatted/istream_extractors/istream.pass.cpp


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38

//===----------------------------------------------------------------------===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//

// <istream>

// template <class charT, class traits = char_traits<charT> >
//   class basic_istream;

// basic_istream<charT,traits>& operator>>(basic_istream<charT,traits>&
//                                         (*pf)(basic_istream<charT,traits>&));

#include <istream>
#include <cassert>

int f_called = 0;

template <class CharT>
std::basic_istream<CharT>&
f(std::basic_istream<CharT>& is)
{
    ++f_called;
    return is;
}

int main()
{
    {
        std::istream is((std::streambuf*)0);
        is >> f;
        assert(f_called == 1);
    }
}