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 int main(int, char**)
21 {
22     std::priority_queue<int> q1;
23     std::priority_queue<int> q2;
24     q1.push(1);
25     q1.push(3);
26     q1.push(2);
27     swap(q1, q2);
28     assert(q1.empty());
29     assert(q2.size() == 3);
30     assert(q2.top() == 3);
31 
32   return 0;
33 }
34