libstdc++-v3/testsuite/23_containers/unordered_set/cons/moveable.cc

   1 // { dg-do run { target c++11 } }
   2
   3 // Copyright (C) 2007-2025 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
  21 // NOTE: This makes use of the fact that we know how moveable
  22 // is implemented on set (via swap). If the implementation changed
  23 // this test may begin to fail.
  24
  25 #include <unordered_set>
  26 #include <utility>
  27 #include <testsuite_hooks.h>
  28
  29 int main()
  30 {
  31   std::unordered_set<int> a,b;
  32   a.insert(2);
  33   b.insert(1);
  34   b = std::move(a);
  35   VERIFY( b.find(2) != b.end() && a.find(1) == a.end() );
  36
  37   std::unordered_set<int> c(std::move(b));
  38   VERIFY( c.find(2) != c.end() );
  39   VERIFY( b.find(2) == b.end() );
  40   return 0;
  41 }