libstdc++-v3/testsuite/27_io/ostringstream_members.cc

   1 // 2001-05-23 Benjamin Kosnik  <bkoz@redhat.com>
   2
   3 // Copyright (C) 2001 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 2, 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 COPYING.  If not, write to the Free
  18 // Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
  19 // USA.
  20
  21 // 27.7.3.2 member functions (ostringstream_members)
  22
  23 #include <sstream>
  24 #include <testsuite_hooks.h>
  25
  26 void test01()
  27 {
  28   bool test = true;
  29   std::ostringstream os01;
  30   const std::string str00;
  31   const std::string str01 = "123";
  32   std::string str02;
  33   const int i01 = 123;
  34   int a,b;
  35
  36   std::ios_base::iostate state1, state2, statefail, stateeof;
  37   statefail = std::ios_base::failbit;
  38   stateeof = std::ios_base::eofbit;
  39
  40   // string str() const
  41   str02 = os01.str();
  42   VERIFY( str00 == str02 );
  43
  44   // void str(const basic_string&)
  45   os01.str(str01);
  46   str02 = os01.str();
  47   VERIFY( str01 == str02 );
  48
  49  #ifdef DEBUG_ASSERT
  50   assert(test);
  51 #endif
  52 }
  53
  54 void
  55 redirect_buffer(std::ios& stream, std::streambuf* new_buf)
  56 { stream.rdbuf(new_buf); }
  57
  58 std::streambuf*
  59 active_buffer(std::ios& stream)
  60 { return stream.rdbuf(); }
  61
  62 // libstdc++/2832
  63 void test02()
  64 {
  65   bool test = true;
  66   const char* strlit01 = "fuck war";
  67   const char* strlit02 = "two less cars abstract riot crew, critical mass/SF";
  68   const std::string str00;
  69   const std::string str01(strlit01);
  70   std::string str02;
  71   std::stringbuf sbuf(str01);
  72   std::streambuf* pbasebuf0 = &sbuf;
  73
  74   std::ostringstream sstrm1;
  75   VERIFY( sstrm1.str() == str00 );
  76   // derived rdbuf() always returns original streambuf, even though
  77   // it's no longer associated with the stream.
  78   std::stringbuf* const buf1 = sstrm1.rdbuf();
  79   // base rdbuf() returns the currently associated streambuf
  80   std::streambuf* pbasebuf1 = active_buffer(sstrm1);
  81   redirect_buffer(sstrm1, &sbuf);
  82   std::stringbuf* const buf2 = sstrm1.rdbuf();
  83   std::streambuf* pbasebuf2 = active_buffer(sstrm1);
  84   VERIFY( buf1 == buf2 );
  85   VERIFY( pbasebuf1 != pbasebuf2 );
  86   VERIFY( pbasebuf2 == pbasebuf0 );
  87
  88   // derived rdbuf() returns the original buf, so str() doesn't change.
  89   VERIFY( sstrm1.str() != str01 );
  90   VERIFY( sstrm1.str() == str00 );
  91   // however, casting the active streambuf to a stringbuf shows what's up:
  92   std::stringbuf* psbuf = dynamic_cast<std::stringbuf*>(pbasebuf2);
  93   str02 = psbuf->str();
  94   VERIFY( str02 == str01 );
  95
  96   // How confusing and non-intuitive is this?
  97   // These semantics are a joke, a serious defect, and incredibly lame.
  98 }
  99
 100 int main()
 101 {
 102   test01();
 103   test02();
 104   return 0;
 105 }