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a5544970 | 1 | // Copyright (C) 2004-2019 Free Software Foundation, Inc. |
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2 | // |
3 | // This file is part of the GNU ISO C++ Library. This library is free | |
4 | // software; you can redistribute it and/or modify it under the | |
5 | // terms of the GNU General Public License as published by the | |
748086b7 | 6 | // Free Software Foundation; either version 3, or (at your option) |
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7 | // any later version. |
8 | ||
9 | // This library is distributed in the hope that it will be useful, | |
10 | // but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | // GNU General Public License for more details. | |
13 | ||
14 | // You should have received a copy of the GNU General Public License along | |
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15 | // with this library; see the file COPYING3. If not see |
16 | // <http://www.gnu.org/licenses/>. | |
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17 | |
18 | // 27.7.3.2 member functions (ostringstream_members) | |
19 | ||
20 | #include <sstream> | |
21 | #include <testsuite_hooks.h> | |
22 | ||
23 | void | |
24 | redirect_buffer(std::wios& stream, std::wstreambuf* new_buf) | |
25 | { stream.rdbuf(new_buf); } | |
26 | ||
27 | std::wstreambuf* | |
28 | active_buffer(std::wios& stream) | |
29 | { return stream.rdbuf(); } | |
30 | ||
31 | // libstdc++/2832 | |
32 | void test02() | |
33 | { | |
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34 | const wchar_t* strlit01 = L"fuck war"; |
35 | const std::wstring str00; | |
36 | const std::wstring str01(strlit01); | |
37 | std::wstring str02; | |
38 | std::wstringbuf sbuf(str01); | |
39 | std::wstreambuf* pbasebuf0 = &sbuf; | |
40 | ||
41 | std::wostringstream sstrm1; | |
42 | VERIFY( sstrm1.str() == str00 ); | |
43 | // derived rdbuf() always returns original streambuf, even though | |
44 | // it's no longer associated with the stream. | |
45 | std::wstringbuf* const buf1 = sstrm1.rdbuf(); | |
46 | // base rdbuf() returns the currently associated streambuf | |
47 | std::wstreambuf* pbasebuf1 = active_buffer(sstrm1); | |
48 | redirect_buffer(sstrm1, &sbuf); | |
49 | std::wstringbuf* const buf2 = sstrm1.rdbuf(); | |
50 | std::wstreambuf* pbasebuf2 = active_buffer(sstrm1); | |
51 | VERIFY( buf1 == buf2 ); | |
52 | VERIFY( pbasebuf1 != pbasebuf2 ); | |
53 | VERIFY( pbasebuf2 == pbasebuf0 ); | |
54 | ||
55 | // derived rdbuf() returns the original buf, so str() doesn't change. | |
56 | VERIFY( sstrm1.str() != str01 ); | |
57 | VERIFY( sstrm1.str() == str00 ); | |
58 | // however, casting the active streambuf to a stringbuf shows what's up: | |
59 | std::wstringbuf* psbuf = dynamic_cast<std::wstringbuf*>(pbasebuf2); | |
60 | str02 = psbuf->str(); | |
61 | VERIFY( str02 == str01 ); | |
62 | ||
63 | // How confusing and non-intuitive is this? | |
64 | // These semantics are a joke, a serious defect, and incredibly lame. | |
65 | } | |
66 | ||
67 | int main() | |
68 | { | |
69 | test02(); | |
70 | return 0; | |
71 | } |