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23cac885 | 1 | // 2001-05-23 Benjamin Kosnik <bkoz@redhat.com> |
d422980b | 2 | |
a945c346 | 3 | // Copyright (C) 2001-2024 Free Software Foundation, Inc. |
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4 | // |
5 | // This file is part of the GNU ISO C++ Library. This library is free | |
6 | // software; you can redistribute it and/or modify it under the | |
7 | // terms of the GNU General Public License as published by the | |
748086b7 | 8 | // Free Software Foundation; either version 3, or (at your option) |
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9 | // any later version. |
10 | ||
11 | // This library is distributed in the hope that it will be useful, | |
12 | // but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | // GNU General Public License for more details. | |
15 | ||
16 | // You should have received a copy of the GNU General Public License along | |
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17 | // with this library; see the file COPYING3. If not see |
18 | // <http://www.gnu.org/licenses/>. | |
d422980b | 19 | |
23cac885 | 20 | // 27.7.3.2 member functions (ostringstream_members) |
d422980b | 21 | |
23cac885 | 22 | #include <sstream> |
fe413112 | 23 | #include <testsuite_hooks.h> |
d422980b | 24 | |
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25 | void |
26 | redirect_buffer(std::ios& stream, std::streambuf* new_buf) | |
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27 | { stream.rdbuf(new_buf); } |
28 | ||
29 | std::streambuf* | |
30 | active_buffer(std::ios& stream) | |
31 | { return stream.rdbuf(); } | |
32 | ||
33 | // libstdc++/2832 | |
34 | void test02() | |
35 | { | |
d422980b | 36 | const char* strlit01 = "fuck war"; |
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37 | const std::string str00; |
38 | const std::string str01(strlit01); | |
39 | std::string str02; | |
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40 | std::stringbuf sbuf(str01); |
41 | std::streambuf* pbasebuf0 = &sbuf; | |
d422980b | 42 | |
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43 | std::ostringstream sstrm1; |
44 | VERIFY( sstrm1.str() == str00 ); | |
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45 | // derived rdbuf() always returns original streambuf, even though |
46 | // it's no longer associated with the stream. | |
23cac885 | 47 | std::stringbuf* const buf1 = sstrm1.rdbuf(); |
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48 | // base rdbuf() returns the currently associated streambuf |
49 | std::streambuf* pbasebuf1 = active_buffer(sstrm1); | |
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50 | redirect_buffer(sstrm1, &sbuf); |
51 | std::stringbuf* const buf2 = sstrm1.rdbuf(); | |
d422980b | 52 | std::streambuf* pbasebuf2 = active_buffer(sstrm1); |
e9c31052 | 53 | VERIFY( buf1 == buf2 ); |
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54 | VERIFY( pbasebuf1 != pbasebuf2 ); |
55 | VERIFY( pbasebuf2 == pbasebuf0 ); | |
56 | ||
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57 | // derived rdbuf() returns the original buf, so str() doesn't change. |
58 | VERIFY( sstrm1.str() != str01 ); | |
59 | VERIFY( sstrm1.str() == str00 ); | |
60 | // however, casting the active streambuf to a stringbuf shows what's up: | |
e9c31052 | 61 | #if __cpp_rtti |
23cac885 | 62 | std::stringbuf* psbuf = dynamic_cast<std::stringbuf*>(pbasebuf2); |
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63 | #else |
64 | std::stringbuf* psbuf = static_cast<std::stringbuf*>(pbasebuf2); | |
65 | #endif | |
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66 | str02 = psbuf->str(); |
67 | VERIFY( str02 == str01 ); | |
68 | ||
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69 | // How confusing and non-intuitive is this? |
70 | // These semantics are a joke, a serious defect, and incredibly lame. | |
71 | } | |
72 | ||
73 | int main() | |
74 | { | |
75 | test02(); | |
76 | return 0; | |
77 | } |