in_avail.pass.cpp revision b64f8b07c104c6cc986570ac8ee0ed16a9f23976 
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// <streambuf>
11
12// template <class charT, class traits = char_traits<charT> >
13// class basic_streambuf;
14
15// streamsize in_avail();
16
17#include <streambuf>
18#include <cassert>
19
20int showmanyc_called = 0;
21
22template <class CharT>
23struct test
24    : public std::basic_streambuf<CharT>
25{
26    typedef std::basic_streambuf<CharT> base;
27
28    test() {}
29
30    void setg(CharT* gbeg, CharT* gnext, CharT* gend)
31    {
32        base::setg(gbeg, gnext, gend);
33    }
34protected:
35    std::streamsize showmanyc()
36    {
37        ++showmanyc_called;
38        return 5;
39    }
40};
41
42int main()
43{
44    {
45        test<char> t;
46        assert(t.in_avail() == 5);
47        assert(showmanyc_called == 1);
48        char in[5];
49        t.setg(in, in+2, in+5);
50        assert(t.in_avail() == 3);
51    }
52}
53