libstdc++-v3/testsuite/23_containers/vector/allocator/swap.cc

   1 // Copyright (C) 2011-2025 Free Software Foundation, Inc.
   2 //
   3 // This file is part of the GNU ISO C++ Library.  This library is free
   4 // software; you can redistribute it and/or modify it under the
   5 // terms of the GNU General Public License as published by the
   6 // Free Software Foundation; either version 3, or (at your option)
   7 // any later version.
   8
   9 // This library is distributed in the hope that it will be useful,
  10 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 // GNU General Public License for more details.
  13
  14 // You should have received a copy of the GNU General Public License along
  15 // with this library; see the file COPYING3.  If not see
  16 // <http://www.gnu.org/licenses/>.
  17
  18 // { dg-do run { target c++11 } }
  19
  20 #include <vector>
  21 #include <testsuite_hooks.h>
  22 #include <testsuite_allocator.h>
  23
  24 struct T { int i; };
  25
  26 using __gnu_test::propagating_allocator;
  27
  28 // It is undefined behaviour to swap() containers wth unequal allocators
  29 // if the allocator doesn't propagate, so ensure the allocators compare
  30 // equal, while still being able to test propagation via get_personality().
  31 bool
  32 operator==(const propagating_allocator<T, false>&,
  33            const propagating_allocator<T, false>&)
  34 {
  35   return true;
  36 }
  37
  38 bool
  39 operator!=(const propagating_allocator<T, false>&,
  40            const propagating_allocator<T, false>&)
  41 {
  42   return false;
  43 }
  44
  45 void test01()
  46 {
  47   typedef propagating_allocator<T, false> alloc_type;
  48   typedef std::vector<T, alloc_type> test_type;
  49   test_type v1(alloc_type(1));
  50   v1.push_back(T());
  51   test_type v2(alloc_type(2));
  52   v2.push_back(T());
  53   std::swap(v1, v2);
  54   VERIFY(1 == v1.get_allocator().get_personality());
  55   VERIFY(2 == v2.get_allocator().get_personality());
  56   // swap back so assertions in uneq_allocator::deallocate don't fail
  57   std::swap(v1, v2);
  58 }
  59
  60 void test02()
  61 {
  62   typedef propagating_allocator<T, true> alloc_type;
  63   typedef std::vector<T, alloc_type> test_type;
  64   test_type v1(alloc_type(1));
  65   v1.push_back(T());
  66   test_type v2(alloc_type(2));
  67   v2.push_back(T());
  68   std::swap(v1, v2);
  69   VERIFY(2 == v1.get_allocator().get_personality());
  70   VERIFY(1 == v2.get_allocator().get_personality());
  71 }
  72
  73 int main()
  74 {
  75   test01();
  76   test02();
  77   return 0;
  78 }