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

   1 // Copyright (C) 2013-2025 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 <set>
  21 #include <testsuite_hooks.h>
  22 #include <testsuite_allocator.h>
  23
  24 struct T { int i; };
  25
  26 bool operator<(T l, T r) { return l.i < r.i; }
  27
  28 using Cmp = std::less<T>;
  29
  30 using __gnu_test::propagating_allocator;
  31
  32 // It is undefined behaviour to swap() containers wth unequal allocators
  33 // if the allocator doesn't propagate, so ensure the allocators compare
  34 // equal, while still being able to test propagation via get_personality().
  35 bool
  36 operator==(const propagating_allocator<T, false>&,
  37            const propagating_allocator<T, false>&)
  38 {
  39   return true;
  40 }
  41
  42 bool
  43 operator!=(const propagating_allocator<T, false>&,
  44            const propagating_allocator<T, false>&)
  45 {
  46   return false;
  47 }
  48
  49 void test01()
  50 {
  51   typedef propagating_allocator<T, false> alloc_type;
  52   typedef std::set<T, Cmp, alloc_type> test_type;
  53   test_type v1(alloc_type(1));
  54   v1 = { test_type::value_type{} };
  55   test_type v2(alloc_type(2));
  56   v2 = { test_type::value_type{} };
  57   std::swap(v1, v2);
  58   VERIFY(1 == v1.get_allocator().get_personality());
  59   VERIFY(2 == v2.get_allocator().get_personality());
  60   // swap back so assertions in uneq_allocator::deallocate don't fail
  61   std::swap(v1, v2);
  62 }
  63
  64 void test02()
  65 {
  66   typedef propagating_allocator<T, true> alloc_type;
  67   typedef std::set<T, Cmp, alloc_type> test_type;
  68   test_type v1(alloc_type(1));
  69   v1 = { test_type::value_type{} };
  70   test_type v2(alloc_type(2));
  71   v2 = { test_type::value_type{} };
  72   std::swap(v1, v2);
  73   VERIFY(2 == v1.get_allocator().get_personality());
  74   VERIFY(1 == v2.get_allocator().get_personality());
  75 }
  76
  77 int main()
  78 {
  79   test01();
  80   test02();
  81   return 0;
  82 }