libstdc++-v3/testsuite/23_containers/unordered_set/modifiers/swap.cc

   1 // Copyright (C) 2014-2025 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 <unordered_set>
  21 #include <testsuite_hooks.h>
  22
  23 void test01()
  24 {
  25   std::unordered_set<int> us1 { 0, 1 };
  26   {
  27     std::unordered_set<int> us2(std::move(us1));
  28
  29     us1.swap(us2);
  30
  31     VERIFY( us1.find(0) != us1.end() );
  32
  33     us1.insert(2);
  34
  35     VERIFY( us1.size() == 3 );
  36
  37     us2.swap(us1);
  38
  39     VERIFY( us2.size() == 3 );
  40     VERIFY( us2.find(2) != us2.end() );
  41
  42     us1 = { 3, 4, 5 };
  43
  44     VERIFY( us1.size() == 3 );
  45     VERIFY( us1.bucket_count() >= 3 );
  46
  47     std::unordered_set<int> us3(std::move(us1));
  48     us3 = std::move(us2);
  49
  50     us1.swap(us2);
  51
  52     VERIFY( us1.empty() );
  53     VERIFY( us2.empty() );
  54   }
  55
  56   us1 = { 0, 1 };
  57   VERIFY( us1.size() == 2 );
  58 }
  59
  60 int main()
  61 {
  62   test01();
  63   return 0;
  64 }