libstdc++-v3/testsuite/23_containers/vector/invalidation/2.cc

   1 // Vector iterator invalidation tests
   2
   3 // Copyright (C) 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 // We need to be pedantic about reallocations for this testcase to be correct.
  22 // { dg-options "-D_GLIBCXX_DEBUG_PEDANTIC" }
  23
  24 #ifndef _GLIBCXX_DEBUG_PEDANTIC
  25 #  define _GLIBCXX_DEBUG_PEDANTIC 1
  26 #endif
  27
  28 #include <debug/vector>
  29 #include <testsuite_hooks.h>
  30
  31 using __gnu_debug::vector;
  32
  33 bool test = true;
  34
  35 // Resize
  36 void test02()
  37 {
  38   vector<int> v(10, 17);
  39   v.reserve(20);
  40
  41   vector<int>::iterator before = v.begin() + 6;
  42   vector<int>::iterator at = before + 1;
  43   vector<int>::iterator after = at + 1;
  44
  45   // Shrink
  46   v.resize(7);
  47   VERIFY(before._M_dereferenceable());
  48   VERIFY(at._M_singular());
  49   VERIFY(after._M_singular());
  50
  51   // Grow, without reallocation
  52   before = v.begin() + 6;
  53   v.resize(17);
  54   VERIFY(before._M_dereferenceable());
  55
  56   // Grow, with reallocation
  57   v.resize(42);
  58   VERIFY(before._M_singular());
  59 }
  60
  61 int main()
  62 {
  63   test02();
  64   return !test;
  65 }