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3 // Copyright (C) 2000-2013 Free Software Foundation, Inc.
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
8 // Free Software Foundation; either version 3, or (at your option)
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.
16 // You should have received a copy of the GNU General Public License along
17 // with this library; see the file COPYING3. If not see
18 // <http://www.gnu.org/licenses/>.
20 // 27.7.2.2 member functions (istringstream_members)
23 #include <testsuite_hooks.h>
26 redirect_buffer(std::ios
& stream
, std::streambuf
* new_buf
)
27 { stream
.rdbuf(new_buf
); }
30 active_buffer(std::ios
& stream
)
31 { return stream
.rdbuf(); }
36 bool test
__attribute__((unused
)) = true;
37 const char* strlit01
= "fuck war";
38 const std::string str00
;
39 const std::string
str01(strlit01
);
41 std::stringbuf
sbuf(str01
);
42 std::streambuf
* pbasebuf0
= &sbuf
;
44 std::istringstream sstrm1
;
45 VERIFY( sstrm1
.str() == str00
);
46 // derived rdbuf() always returns original streambuf, even though
47 // it's no longer associated with the stream.
48 std::stringbuf
* const buf1
= sstrm1
.rdbuf();
49 // base rdbuf() returns the currently associated streambuf
50 std::streambuf
* pbasebuf1
= active_buffer(sstrm1
);
51 redirect_buffer(sstrm1
, &sbuf
);
52 std::stringbuf
* const buf2
= sstrm1
.rdbuf();
53 std::streambuf
* pbasebuf2
= active_buffer(sstrm1
);
54 VERIFY( buf1
== buf2
);
55 VERIFY( pbasebuf1
!= pbasebuf2
);
56 VERIFY( pbasebuf2
== pbasebuf0
);
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
);
64 VERIFY( str02
== str01
);
66 // How confusing and non-intuitive is this?
67 // These semantics are a joke, a serious defect, and incredibly lame.