libstdc++-v3/testsuite/21_strings/basic_string/element_access/char/2.cc

   1 // 1999-06-08 bkoz
   2
   3 // Copyright (C) 1999, 2003 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 // 21.3 template class basic_string
  22
  23 #include <string>
  24 #include <stdexcept>
  25 #include <testsuite_hooks.h>
  26
  27 // Do a quick sanity check on known problems with element access and
  28 // ref-counted strings. These should all pass, regardless of the
  29 // underlying string implementation, of course.
  30 bool test01(void)
  31 {
  32   bool test __attribute__((unused)) = true;
  33   typedef std::string::size_type csize_type;
  34   typedef std::string::iterator siterator;
  35   typedef std::string::reverse_iterator sriterator;
  36   csize_type csz01, csz02;
  37   siterator it1;
  38   sriterator rit1;
  39
  40   std::string str01("montara beach, half moon bay");
  41   const std::string str02("ocean beach, san francisco");
  42   std::string str03;
  43
  44   // 21.3 p 5
  45
  46   // References, pointers, and iterators referring to the elements of
  47   // a basic_string may be invalidated by the following uses of that
  48   // basic_string object:
  49
  50   // ...
  51
  52   // Susequent to any of the above uses except the forms of insert()
  53   // and erase() which return iterators, the first call to non-const
  54   // member functions operator[](), at(), begin(), rbegin(), end(), or
  55   // rend()
  56
  57   str03 = str01;
  58   it1 = str01.begin();
  59   *it1 = 'x';
  60   VERIFY( str01[0] == 'x' );
  61   VERIFY( str03[0] == 'm' );
  62
  63   str03 = str01;
  64   csz01 = str01.size();
  65   rit1 = str01.rbegin(); // NB: Pointing at one-past the end, so ...
  66   *rit1 = 'z';           // ... but it's taken care of here
  67   VERIFY( str01[csz01 - 1] == 'z' );
  68   VERIFY( str03[csz01 - 1] == 'y' );
  69
  70   str03 = str01;
  71   csz01 = str01.size();
  72   std::string::reference r1 = str01.at(csz01 - 2);
  73   VERIFY( str03 == str01 );
  74   r1 = 'd';
  75   VERIFY( str01[csz01 - 2] == 'd' );
  76   VERIFY( str03[csz01 - 2] == 'a' );
  77
  78   str03 = str01;
  79   csz01 = str01.size();
  80   std::string::reference r2 = str01[csz01 - 3];
  81   VERIFY( str03 == str01 );
  82   r2 = 'w';
  83   VERIFY( str01[csz01 - 3] == 'w' );
  84   VERIFY( str03[csz01 - 3] == 'b' );
  85
  86   str03 = str01;
  87   csz02 = str01.size();
  88   it1 = str01.end();
  89   VERIFY( str03 == str01 );
  90   --it1;
  91   *it1 = 'q';
  92   VERIFY( str01[csz02 - 1] == 'q' );
  93   VERIFY( str03[csz02 - 1] == 'z' );
  94
  95   str03 = str01;
  96   rit1 = str01.rend();
  97   VERIFY( str03 == str01 );
  98   --rit1;
  99   *rit1 = 'p';
 100   VERIFY( str01[0] == 'p' );
 101   VERIFY( str03[0] == 'x' );
 102
 103   // need to also test for const begin/const end
 104   return test;
 105 }
 106
 107 int main()
 108 {
 109   test01();
 110   return 0;
 111 }