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 // void swap(priority_queue& q);
14 
15 #include <queue>
16 #include <cassert>
17 
18 int main()
19 {
20     std::priority_queue<int> q1;
21     std::priority_queue<int> q2;
22     q1.push(1);
23     q1.push(3);
24     q1.push(2);
25     q1.swap(q2);
26     assert(q1.empty());
27     assert(q2.size() == 3);
28     assert(q2.top() == 3);
29 }
30