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1 // Copyright (C) 2004-2023 Free Software Foundation, Inc.
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
6 // Free Software Foundation; either version 3, or (at your option)
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.
14 // You should have received a copy of the GNU General Public License along
15 // with this library; see the file COPYING3. If not see
16 // <http://www.gnu.org/licenses/>.
18 // 27.7.2.2 member functions (istringstream_members)
21 #include <testsuite_hooks.h>
24 redirect_buffer(std::wios
& stream
, std::wstreambuf
* new_buf
)
25 { stream
.rdbuf(new_buf
); }
28 active_buffer(std::wios
& stream
)
29 { return stream
.rdbuf(); }
34 const wchar_t* strlit01
= L
"fuck war";
35 const std::wstring str00
;
36 const std::wstring
str01(strlit01
);
38 std::wstringbuf
sbuf(str01
);
39 std::wstreambuf
* pbasebuf0
= &sbuf
;
41 std::wistringstream 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
);
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:
60 std::wstringbuf
* psbuf
= dynamic_cast<std::wstringbuf
*>(pbasebuf2
);
62 std::wstringbuf
* psbuf
= static_cast<std::wstringbuf
*>(pbasebuf2
);
65 VERIFY( str02
== str01
);
67 // How confusing and non-intuitive is this?
68 // These semantics are a joke, a serious defect, and incredibly lame.