1// 2003-04-01 Benjamin Kosnik <bkoz@redhat.com> 2 3// Copyright (C) 2003-2015 Free Software Foundation, Inc. 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 8// Free Software Foundation; either version 3, or (at your option) 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 17// with this library; see the file COPYING3. If not see 18// <http://www.gnu.org/licenses/>. 19 20// 27.7.6 - Member functions [lib.stringstream.members] 21 22#include <sstream> 23#include <testsuite_hooks.h> 24 25void 26redirect_buffer(std::ios& stream, std::streambuf* new_buf) 27{ stream.rdbuf(new_buf); } 28 29std::streambuf* 30active_buffer(std::ios& stream) 31{ return stream.rdbuf(); } 32 33// libstdc++/2832 34void test02() 35{ 36 bool test __attribute__((unused)) = true; 37 std::stringbuf sbuf; 38 std::streambuf* pbasebuf0 = &sbuf; 39 40 std::stringstream sstrm1; 41 // derived rdbuf() always returns original streambuf, even though 42 // it's no longer associated with the stream. 43 std::stringbuf* const buf1 = sstrm1.rdbuf(); 44 // base rdbuf() returns the currently associated streambuf 45 std::streambuf* pbasebuf1 = active_buffer(sstrm1); 46 redirect_buffer(sstrm1, &sbuf); 47 std::stringbuf* const buf2 = sstrm1.rdbuf(); 48 std::streambuf* pbasebuf2 = active_buffer(sstrm1); 49 VERIFY( buf1 == buf2 ); 50 VERIFY( pbasebuf1 != pbasebuf2 ); 51 VERIFY( pbasebuf2 == pbasebuf0 ); 52 53 // How confusing and non-intuitive is this? 54 // These semantics are a joke, a serious defect, and incredibly lame. 55} 56 57int main() 58{ 59 test02(); 60 return 0; 61} 62