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

   1 // Vector iterator invalidation tests
   2
   3 // Copyright (C) 2003-2025 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 // We need to be pedantic about reallocations for this testcase to be correct.
  21 // { dg-options "-D_GLIBCXX_DEBUG_PEDANTIC" }
  22
  23 #ifndef _GLIBCXX_DEBUG_PEDANTIC
  24 #  define _GLIBCXX_DEBUG_PEDANTIC 1
  25 #endif
  26
  27 #include <debug/vector>
  28 #include <testsuite_hooks.h>
  29
  30 using __gnu_debug::vector;
  31
  32 bool test = true;
  33
  34 // Resize
  35 void test02()
  36 {
  37   vector<int> v(10, 17);
  38   v.reserve(20);
  39
  40   vector<int>::iterator before = v.begin() + 6;
  41   vector<int>::iterator at = before + 1;
  42   vector<int>::iterator after = at + 1;
  43
  44   // Shrink
  45   v.resize(7);
  46   VERIFY(before._M_dereferenceable());
  47   VERIFY(at._M_singular());
  48   VERIFY(after._M_singular());
  49
  50   // Grow, without reallocation
  51   before = v.begin() + 6;
  52   v.resize(17);
  53   VERIFY(before._M_dereferenceable());
  54
  55   // Grow, with reallocation
  56   v.resize(42);
  57   VERIFY(before._M_singular());
  58 }
  59
  60 int main()
  61 {
  62   test02();
  63   return 0;
  64 }