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& operator=(basic_istream&& rhs);
16 
17 #include <istream>
18 #include <cassert>
19 
20 #ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
21 
22 template <class CharT>
23 struct testbuf
24     : public std::basic_streambuf<CharT>
25 {
testbuftestbuf26     testbuf() {}
27 };
28 
29 template <class CharT>
30 struct test_istream
31     : public std::basic_istream<CharT>
32 {
33     typedef std::basic_istream<CharT> base;
test_istreamtest_istream34     test_istream(testbuf<CharT>* sb) : base(sb) {}
35 
operator =test_istream36     test_istream& operator=(test_istream&& s)
37         {base::operator=(std::move(s)); return *this;}
38 };
39 
40 #endif  // _LIBCPP_HAS_NO_RVALUE_REFERENCES
41 
main()42 int main()
43 {
44 #ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
45     {
46         testbuf<char> sb1;
47         testbuf<char> sb2;
48         test_istream<char> is1(&sb1);
49         test_istream<char> is2(&sb2);
50         is2 = (std::move(is1));
51         assert(is1.rdbuf() == &sb1);
52         assert(is1.tie() == 0);
53         assert(is1.fill() == ' ');
54         assert(is1.rdstate() == is1.goodbit);
55         assert(is1.exceptions() == is1.goodbit);
56         assert(is1.flags() == (is1.skipws | is1.dec));
57         assert(is1.precision() == 6);
58         assert(is1.getloc().name() == "C");
59         assert(is2.rdbuf() == &sb2);
60         assert(is2.tie() == 0);
61         assert(is2.fill() == ' ');
62         assert(is2.rdstate() == is2.goodbit);
63         assert(is2.exceptions() == is2.goodbit);
64         assert(is2.flags() == (is2.skipws | is2.dec));
65         assert(is2.precision() == 6);
66         assert(is2.getloc().name() == "C");
67     }
68     {
69         testbuf<wchar_t> sb1;
70         testbuf<wchar_t> sb2;
71         test_istream<wchar_t> is1(&sb1);
72         test_istream<wchar_t> is2(&sb2);
73         is2 = (std::move(is1));
74         assert(is1.rdbuf() == &sb1);
75         assert(is1.tie() == 0);
76         assert(is1.fill() == ' ');
77         assert(is1.rdstate() == is1.goodbit);
78         assert(is1.exceptions() == is1.goodbit);
79         assert(is1.flags() == (is1.skipws | is1.dec));
80         assert(is1.precision() == 6);
81         assert(is1.getloc().name() == "C");
82         assert(is2.rdbuf() == &sb2);
83         assert(is2.tie() == 0);
84         assert(is2.fill() == ' ');
85         assert(is2.rdstate() == is2.goodbit);
86         assert(is2.exceptions() == is2.goodbit);
87         assert(is2.flags() == (is2.skipws | is2.dec));
88         assert(is2.precision() == 6);
89         assert(is2.getloc().name() == "C");
90     }
91 #endif  // _LIBCPP_HAS_NO_RVALUE_REFERENCES
92 }
93