libstdc++-v3/testsuite/21_strings/basic_string/inserters_extractors/char/6.cc

   1 // 1999-07-01 bkoz
   2
   3 // Copyright (C) 1999, 2000, 2001, 2002, 2003, 2009
   4 // Free Software Foundation, Inc.
   5 //
   6 // This file is part of the GNU ISO C++ Library.  This library is free
   7 // software; you can redistribute it and/or modify it under the
   8 // terms of the GNU General Public License as published by the
   9 // Free Software Foundation; either version 3, or (at your option)
  10 // any later version.
  11
  12 // This library is distributed in the hope that it will be useful,
  13 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 // GNU General Public License for more details.
  16
  17 // You should have received a copy of the GNU General Public License along
  18 // with this library; see the file COPYING3.  If not see
  19 // <http://www.gnu.org/licenses/>.
  20
  21 // 21.3.7.9 inserters and extractors
  22
  23 // NB: This file is predicated on sstreams, istreams, and ostreams
  24 // working, not to mention other major details like char_traits, and
  25 // all of the string class.
  26
  27 #include <string>
  28 #include <sstream>
  29 #include <testsuite_hooks.h>
  30
  31 // istringstream/stringbuf extractor properly size buffer based on
  32 // actual, not allocated contents (string.size() vs. string.capacity()).
  33 // http://gcc.gnu.org/ml/libstdc++/1999-q4/msg00049.html
  34 void test06(void)
  35 {
  36   bool test __attribute__((unused)) = true;
  37
  38   typedef std::string::size_type size_type;
  39   std::string str01("@silent");
  40   size_type i01 = str01.size();
  41   size_type i02 = str01.capacity();
  42   str01.erase(0, 1);
  43   size_type i03 = str01.size();
  44   size_type i04 = str01.capacity();
  45   VERIFY( i01 - 1 == i03 );
  46   VERIFY( i02 >= i04 );
  47
  48   std::istringstream is(str01);
  49   std::string str02;
  50   is >> str02 >> std::ws;
  51   size_type i05 = str02.size();
  52   size_type i06 = str02.capacity();
  53   VERIFY( i05 == i03 );
  54   VERIFY( i06 <= i04 );
  55 }
  56
  57 int main()
  58 {
  59   test06();
  60   return 0;
  61 }