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2001-05-24 Benjamin Kosnik <bkoz@redhat.com> libstdc++/2832 * include/bits/basic_ios.tcc: Small tweak. * include/bits/std_fstream.h (ifstream): Add buffer member. Adjust ctors and dtors, and rdbuf settings. (ofstream): Same. (fstream): Same. * include/bits/std_sstream.h: Same, but for stringstream classes. * testsuite/27_io/ostringstream_members.cc: New. * testsuite/27_io/stringstream_members.cc: New. * testsuite/27_io/fstream_members.cc: New. * testsuite/27_io/ifstream_members.cc: Add test. * testsuite/27_io/istringstream_members.cc: Add test. * testsuite/27_io/ofstream_members.cc: Add test. From-SVN: r42547
132 lines
3.6 KiB
C++
132 lines
3.6 KiB
C++
// 2001-05-24 Benjamin Kosnik <bkoz@redhat.com>
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// Copyright (C) 2001 Free Software Foundation, Inc.
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//
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// This file is part of the GNU ISO C++ Library. This library is free
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// software; you can redistribute it and/or modify it under the
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// terms of the GNU General Public License as published by the
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// Free Software Foundation; either version 2, or (at your option)
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// any later version.
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License along
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// with this library; see the file COPYING. If not, write to the Free
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// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
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// USA.
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// 27.7.6 member functions (stringstream_members)
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#include <sstream>
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#include <debug_assert.h>
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void test01()
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{
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bool test = true;
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std::stringstream is01;
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const std::string str00;
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const std::string str01 = "123";
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std::string str02;
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const int i01 = 123;
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int a,b;
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std::ios_base::iostate state1, state2, statefail, stateeof;
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statefail = std::ios_base::failbit;
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stateeof = std::ios_base::eofbit;
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// string str() const
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str02 = is01.str();
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VERIFY( str00 == str02 );
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// void str(const basic_string&)
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is01.str(str01);
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str02 = is01.str();
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VERIFY( str01 == str02 );
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state1 = is01.rdstate();
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is01 >> a;
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state2 = is01.rdstate();
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VERIFY( a = i01 );
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// 22.2.2.1.2 num_get virtual functions
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// p 13
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// in any case, if stage 2 processing was terminated by the test for
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// in == end then err != ios_base::eofbit is performed.
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VERIFY( state1 != state2 );
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VERIFY( state2 == stateeof );
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is01.str(str01);
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is01 >> b;
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VERIFY( b != a );
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// as is01.good() is false, istream::sentry blocks extraction.
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is01.clear();
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state1 = is01.rdstate();
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is01 >> b;
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state2 = is01.rdstate();
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VERIFY( b == a );
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VERIFY( state1 != state2 );
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VERIFY( state2 == stateeof );
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#ifdef DEBUG_ASSERT
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assert(test);
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#endif
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}
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void
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redirect_buffer(std::ios& stream, std::streambuf* new_buf)
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{ stream.rdbuf(new_buf); }
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std::streambuf*
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active_buffer(std::ios& stream)
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{ return stream.rdbuf(); }
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// libstdc++/2832
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void test02()
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{
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bool test = true;
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const char* strlit01 = "fuck war";
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const char* strlit02 = "two less cars abstract riot crew, critical mass/SF";
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const std::string str00;
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const std::string str01(strlit01);
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std::string str02;
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std::stringbuf sbuf(str01);
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std::streambuf* pbasebuf0 = &sbuf;
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std::stringstream sstrm1;
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VERIFY( sstrm1.str() == str00 );
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// derived rdbuf() always returns original streambuf, even though
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// it's no longer associated with the stream.
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std::stringbuf* const buf1 = sstrm1.rdbuf();
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// base rdbuf() returns the currently associated streambuf
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std::streambuf* pbasebuf1 = active_buffer(sstrm1);
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redirect_buffer(sstrm1, &sbuf);
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std::stringbuf* const buf2 = sstrm1.rdbuf();
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std::streambuf* pbasebuf2 = active_buffer(sstrm1);
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VERIFY( buf1 == buf2 );
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VERIFY( pbasebuf1 != pbasebuf2 );
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VERIFY( pbasebuf2 == pbasebuf0 );
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// derived rdbuf() returns the original buf, so str() doesn't change.
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VERIFY( sstrm1.str() != str01 );
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VERIFY( sstrm1.str() == str00 );
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// however, casting the active streambuf to a stringbuf shows what's up:
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std::stringbuf* psbuf = dynamic_cast<std::stringbuf*>(pbasebuf2);
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str02 = psbuf->str();
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VERIFY( str02 == str01 );
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// How confusing and non-intuitive is this?
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// These semantics are a joke, a serious defect, and incredibly lame.
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}
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int main()
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{
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test01();
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test02();
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return 0;
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}
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