1 //===----------------------------------------------------------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 
9 // <istream>
10 
11 // template <class charT, class traits = char_traits<charT> >
12 // class basic_istream;
13 
14 // void swap(basic_istream& rhs);
15 
16 #include <istream>
17 #include <cassert>
18 
19 #include "test_macros.h"
20 
21 template <class CharT>
22 struct testbuf
23     : public std::basic_streambuf<CharT>
24 {
testbuftestbuf25     testbuf() {}
26 };
27 
28 template <class CharT>
29 struct test_istream
30     : public std::basic_istream<CharT>
31 {
32     typedef std::basic_istream<CharT> base;
test_istreamtest_istream33     test_istream(testbuf<CharT>* sb) : base(sb) {}
34 
swaptest_istream35     void swap(test_istream& s) {base::swap(s);}
36 };
37 
main(int,char **)38 int main(int, char**)
39 {
40     {
41         testbuf<char> sb1;
42         testbuf<char> sb2;
43         test_istream<char> is1(&sb1);
44         test_istream<char> is2(&sb2);
45         is1.swap(is2);
46         assert(is1.rdbuf() == &sb1);
47         assert(is1.tie() == 0);
48         assert(is1.fill() == ' ');
49         assert(is1.rdstate() == is1.goodbit);
50         assert(is1.exceptions() == is1.goodbit);
51         assert(is1.flags() == (is1.skipws | is1.dec));
52         assert(is1.precision() == 6);
53         assert(is1.getloc().name() == "C");
54         assert(is2.rdbuf() == &sb2);
55         assert(is2.tie() == 0);
56         assert(is2.fill() == ' ');
57         assert(is2.rdstate() == is2.goodbit);
58         assert(is2.exceptions() == is2.goodbit);
59         assert(is2.flags() == (is2.skipws | is2.dec));
60         assert(is2.precision() == 6);
61         assert(is2.getloc().name() == "C");
62     }
63     {
64         testbuf<wchar_t> sb1;
65         testbuf<wchar_t> sb2;
66         test_istream<wchar_t> is1(&sb1);
67         test_istream<wchar_t> is2(&sb2);
68         is1.swap(is2);
69         assert(is1.rdbuf() == &sb1);
70         assert(is1.tie() == 0);
71         assert(is1.fill() == ' ');
72         assert(is1.rdstate() == is1.goodbit);
73         assert(is1.exceptions() == is1.goodbit);
74         assert(is1.flags() == (is1.skipws | is1.dec));
75         assert(is1.precision() == 6);
76         assert(is1.getloc().name() == "C");
77         assert(is2.rdbuf() == &sb2);
78         assert(is2.tie() == 0);
79         assert(is2.fill() == ' ');
80         assert(is2.rdstate() == is2.goodbit);
81         assert(is2.exceptions() == is2.goodbit);
82         assert(is2.flags() == (is2.skipws | is2.dec));
83         assert(is2.precision() == 6);
84         assert(is2.getloc().name() == "C");
85     }
86 
87   return 0;
88 }
89