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

   1 // 1999-07-01 bkoz
   2
   3 // Copyright (C) 1999-2020 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 // 21.3.7.9 inserters and extractors
  21
  22 // NB: This file is predicated on sstreams, istreams, and ostreams
  23 // working, not to mention other major details like char_traits, and
  24 // all of the string class.
  25
  26 #include <string>
  27 #include <sstream>
  28 #include <testsuite_hooks.h>
  29
  30 // istringstream/stringbuf extractor properly size buffer based on
  31 // actual, not allocated contents (string.size() vs. string.capacity()).
  32 // http://gcc.gnu.org/ml/libstdc++/1999-q4/msg00049.html
  33 void test06(void)
  34 {
  35   typedef std::wstring::size_type size_type;
  36   std::wstring str01(L"@silent");
  37   size_type i01 = str01.size();
  38   size_type i02 = str01.capacity();
  39   str01.erase(0, 1);
  40   size_type i03 = str01.size();
  41   size_type i04 = str01.capacity();
  42   VERIFY( i01 - 1 == i03 );
  43   VERIFY( i02 >= i04 );
  44
  45   std::wistringstream is(str01);
  46   std::wstring str02;
  47   is >> str02 >> std::ws;
  48   size_type i05 = str02.size();
  49   size_type i06 = str02.capacity();
  50   VERIFY( i05 == i03 );
  51   VERIFY( i06 <= i04 );
  52 }
  53
  54 int main()
  55 {
  56   test06();
  57   return 0;
  58 }