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

   1 // Copyright (C) 2014-2016 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   bool test __attribute__((unused)) = true;
  26   std::unordered_set<int> us1 { 0, 1 };
  27   {
  28     std::unordered_set<int> us2(std::move(us1));
  29
  30     us1.swap(us2);
  31
  32     VERIFY( us1.find(0) != us1.end() );
  33
  34     us1.insert(2);
  35
  36     VERIFY( us1.size() == 3 );
  37
  38     us2.swap(us1);
  39
  40     VERIFY( us2.size() == 3 );
  41     VERIFY( us2.find(2) != us2.end() );
  42
  43     us1 = { 3, 4, 5 };
  44
  45     VERIFY( us1.size() == 3 );
  46     VERIFY( us1.bucket_count() >= 3 );
  47
  48     std::unordered_set<int> us3(std::move(us1));
  49     us3 = std::move(us2);
  50
  51     us1.swap(us2);
  52
  53     VERIFY( us1.empty() );
  54     VERIFY( us2.empty() );
  55   }
  56
  57   us1 = { 0, 1 };
  58   VERIFY( us1.size() == 2 );
  59 }
  60
  61 int main()
  62 {
  63   test01();
  64   return 0;
  65 }