text: // 1999-06-08 bkoz
  
  // Copyright (C) 1999, 2003 Free Software Foundation, Inc.
  //
  // This file is part of the GNU ISO C++ Library.  This library is free
  // software; you can redistribute it and/or modify it under the
  // terms of the GNU General Public License as published by the
  // Free Software Foundation; either version 2, or (at your option)
  // any later version.
  
  // This library is distributed in the hope that it will be useful,
  // but WITHOUT ANY WARRANTY; without even the implied warranty of
  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  // GNU General Public License for more details.
  
  // You should have received a copy of the GNU General Public License along
  // with this library; see the file COPYING.  If not, write to the Free
  // Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
  // USA.
  
  // 21.3 template class basic_string
  
  #include <string>
  #include <stdexcept>
  #include <testsuite_hooks.h>
  
  // Do a quick sanity check on known problems with element access and
  // ref-counted strings. These should all pass, regardless of the
  // underlying string implementation, of course.
  bool test01(void)
  {
    bool test __attribute__((unused)) = true;
    typedef std::string::size_type csize_type;
    typedef std::string::iterator siterator;
    typedef std::string::reverse_iterator sriterator;
    csize_type csz01, csz02;
    siterator it1;
    sriterator rit1;  
  
    std::string str01("montara beach, half moon bay");
    const std::string str02("ocean beach, san francisco");
    std::string str03;
  
    // 21.3 p 5
  
    // References, pointers, and iterators referring to the elements of
    // a basic_string may be invalidated by the following uses of that
    // basic_string object:
  
    // ...
  
    // Susequent to any of the above uses except the forms of insert()
    // and erase() which return iterators, the first call to non-const
    // member functions operator[](), at(), begin(), rbegin(), end(), or
    // rend()
  
    str03 = str01;
    it1 = str01.begin();
    *it1 = 'x';
    VERIFY( str01[0] == 'x' );
    VERIFY( str03[0] == 'm' );
  
    str03 = str01; 
    csz01 = str01.size();
    rit1 = str01.rbegin(); // NB: Pointing at one-past the end, so ...
    *rit1 = 'z'; 		 // ... but it's taken care of here 
    VERIFY( str01[csz01 - 1] == 'z' );
    VERIFY( str03[csz01 - 1] == 'y' );
  
    str03 = str01;
    csz01 = str01.size();
    std::string::reference r1 = str01.at(csz01 - 2);
    VERIFY( str03 == str01 );
    r1 = 'd';
    VERIFY( str01[csz01 - 2] == 'd' );
    VERIFY( str03[csz01 - 2] == 'a' );
  
    str03 = str01; 
    csz01 = str01.size();
    std::string::reference r2 = str01[csz01 - 3];
    VERIFY( str03 == str01 );
    r2 = 'w'; 
    VERIFY( str01[csz01 - 3] == 'w' );
    VERIFY( str03[csz01 - 3] == 'b' );
  
    str03 = str01;
    csz02 = str01.size();
    it1 = str01.end();
    VERIFY( str03 == str01 );
    --it1;
    *it1 = 'q'; 
    VERIFY( str01[csz02 - 1] == 'q' );
    VERIFY( str03[csz02 - 1] == 'z' );
  
    str03 = str01;
    rit1 = str01.rend();
    VERIFY( str03 == str01 );
    --rit1; 	
    *rit1 = 'p'; 
    VERIFY( str01[0] == 'p' );
    VERIFY( str03[0] == 'x' );
  
    // need to also test for const begin/const end
    return test;
  }
  
  int main()
  { 
    test01();
    return 0;
  }
  