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 traits>
13//   basic_istream<char,traits>& operator>>(basic_istream<char,traits>&& in, signed char& c);
14
15#include <istream>
16#include <cassert>
17
18template <class CharT>
19struct testbuf
20    : public std::basic_streambuf<CharT>
21{
22    typedef std::basic_string<CharT> string_type;
23    typedef std::basic_streambuf<CharT> base;
24private:
25    string_type str_;
26public:
27
28    testbuf() {}
29    testbuf(const string_type& str)
30        : str_(str)
31    {
32        base::setg(const_cast<CharT*>(str_.data()),
33                   const_cast<CharT*>(str_.data()),
34                   const_cast<CharT*>(str_.data()) + str_.size());
35    }
36
37    CharT* eback() const {return base::eback();}
38    CharT* gptr() const {return base::gptr();}
39    CharT* egptr() const {return base::egptr();}
40};
41
42int main()
43{
44    {
45        testbuf<char> sb("          ");
46        std::istream is(&sb);
47        signed char c = 'z';
48        is >> c;
49        assert( is.eof());
50        assert( is.fail());
51        assert(c == 'z');
52    }
53    {
54        testbuf<char> sb("   abcdefghijk    ");
55        std::istream is(&sb);
56        signed char c;
57        is >> c;
58        assert(!is.eof());
59        assert(!is.fail());
60        assert(c == 'a');
61        is >> c;
62        assert(!is.eof());
63        assert(!is.fail());
64        assert(c == 'b');
65        is >> c;
66        assert(!is.eof());
67        assert(!is.fail());
68        assert(c == 'c');
69    }
70}
71