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1 | // 2001-05-24 Benjamin Kosnik <bkoz@redhat.com> |
2 | ||
405feeb8 | 3 | // Copyright (C) 2001-2013 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 | // 27.7.6 member functions (stringstream_members) |
d422980b | 21 | |
23cac885 | 22 | #include <sstream> |
fe413112 | 23 | #include <testsuite_hooks.h> |
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24 | |
25 | void | |
26 | redirect_buffer(std::ios& stream, std::streambuf* new_buf) | |
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 | { | |
11f10e6b | 36 | bool test __attribute__((unused)) = true; |
d422980b | 37 | const char* strlit01 = "fuck war"; |
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38 | const std::string str00; |
39 | const std::string str01(strlit01); | |
40 | std::string str02; | |
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41 | std::stringbuf sbuf(str01); |
42 | std::streambuf* pbasebuf0 = &sbuf; | |
d422980b | 43 | |
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44 | std::stringstream sstrm1; |
45 | VERIFY( sstrm1.str() == str00 ); | |
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46 | // derived rdbuf() always returns original streambuf, even though |
47 | // it's no longer associated with the stream. | |
23cac885 | 48 | std::stringbuf* const buf1 = sstrm1.rdbuf(); |
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49 | // base rdbuf() returns the currently associated streambuf |
50 | std::streambuf* pbasebuf1 = active_buffer(sstrm1); | |
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51 | redirect_buffer(sstrm1, &sbuf); |
52 | std::stringbuf* const buf2 = sstrm1.rdbuf(); | |
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53 | std::streambuf* pbasebuf2 = active_buffer(sstrm1); |
54 | VERIFY( buf1 == buf2 ); | |
55 | VERIFY( pbasebuf1 != pbasebuf2 ); | |
56 | VERIFY( pbasebuf2 == pbasebuf0 ); | |
57 | ||
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58 | // derived rdbuf() returns the original buf, so str() doesn't change. |
59 | VERIFY( sstrm1.str() != str01 ); | |
60 | VERIFY( sstrm1.str() == str00 ); | |
61 | // however, casting the active streambuf to a stringbuf shows what's up: | |
62 | std::stringbuf* psbuf = dynamic_cast<std::stringbuf*>(pbasebuf2); | |
63 | str02 = psbuf->str(); | |
64 | VERIFY( str02 == str01 ); | |
65 | ||
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66 | // How confusing and non-intuitive is this? |
67 | // These semantics are a joke, a serious defect, and incredibly lame. | |
68 | } | |
69 | ||
70 | int main() | |
71 | { | |
72 | test02(); | |
73 | return 0; | |
74 | } |