libcxx/test/std/containers/container.adaptors/priority.queue/priqueue.special/swap.pass.cpp

   1 //===----------------------------------------------------------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 // <queue>
  10
  11 // priority_queue();
  12
  13 // template <class T, class Container, class Compare>
  14 //   void swap(priority_queue<T, Container, Compare>& x,
  15 //             priority_queue<T, Container, Compare>& y);
  16
  17 #include <queue>
  18 #include <cassert>
  19
  20 #include "test_macros.h"
  21
  22 int main(int, char**)
  23 {
  24     std::priority_queue<int> q1;
  25     std::priority_queue<int> q2;
  26     q1.push(1);
  27     q1.push(3);
  28     q1.push(2);
  29     swap(q1, q2);
  30     assert(q1.empty());
  31     assert(q2.size() == 3);
  32     assert(q2.top() == 3);
  33
  34   return 0;
  35 }