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

   1 // 1999-06-08 bkoz
   2
   3 // Copyright (C) 1999-2021 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 template class basic_string
  21
  22 #include <string>
  23 #include <stdexcept>
  24 #include <testsuite_hooks.h>
  25
  26 // Do a quick sanity check on known problems with element access and
  27 // ref-counted strings. These should all pass, regardless of the
  28 // underlying string implementation, of course.
  29 void test01(void)
  30 {
  31   typedef std::wstring::size_type csize_type;
  32   typedef std::wstring::iterator siterator;
  33   typedef std::wstring::reverse_iterator sriterator;
  34   csize_type csz01, csz02;
  35   siterator it1;
  36   sriterator rit1;
  37
  38   std::wstring str01(L"montara beach, half moon bay");
  39   const std::wstring str02(L"ocean beach, san francisco");
  40   std::wstring str03;
  41
  42   // 21.3 p 5
  43
  44   // References, pointers, and iterators referring to the elements of
  45   // a basic_string may be invalidated by the following uses of that
  46   // basic_string object:
  47
  48   // ...
  49
  50   // Susequent to any of the above uses except the forms of insert()
  51   // and erase() which return iterators, the first call to non-const
  52   // member functions operator[](), at(), begin(), rbegin(), end(), or
  53   // rend()
  54
  55   str03 = str01;
  56   it1 = str01.begin();
  57   *it1 = L'x';
  58   VERIFY( str01[0] == L'x' );
  59   VERIFY( str03[0] == L'm' );
  60
  61   str03 = str01;
  62   csz01 = str01.size();
  63   rit1 = str01.rbegin(); // NB: Pointing at one-past the end, so ...
  64   *rit1 = L'z';          // ... but it's taken care of here
  65   VERIFY( str01[csz01 - 1] == L'z' );
  66   VERIFY( str03[csz01 - 1] == L'y' );
  67
  68   str03 = str01;
  69   csz01 = str01.size();
  70   std::wstring::reference r1 = str01.at(csz01 - 2);
  71   VERIFY( str03 == str01 );
  72   r1 = L'd';
  73   VERIFY( str01[csz01 - 2] == L'd' );
  74   VERIFY( str03[csz01 - 2] == L'a' );
  75
  76   str03 = str01;
  77   csz01 = str01.size();
  78   std::wstring::reference r2 = str01[csz01 - 3];
  79   VERIFY( str03 == str01 );
  80   r2 = L'w';
  81   VERIFY( str01[csz01 - 3] == L'w' );
  82   VERIFY( str03[csz01 - 3] == L'b' );
  83
  84   str03 = str01;
  85   csz02 = str01.size();
  86   it1 = str01.end();
  87   VERIFY( str03 == str01 );
  88   --it1;
  89   *it1 = L'q';
  90   VERIFY( str01[csz02 - 1] == L'q' );
  91   VERIFY( str03[csz02 - 1] == L'z' );
  92
  93   str03 = str01;
  94   rit1 = str01.rend();
  95   VERIFY( str03 == str01 );
  96   --rit1;
  97   *rit1 = L'p';
  98   VERIFY( str01[0] == L'p' );
  99   VERIFY( str03[0] == L'x' );
 100
 101   // need to also test for const begin/const end
 102 }
 103
 104 int main()
 105 {
 106   test01();
 107   return 0;
 108 }