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1 //===----------------------------------------------------------------------===//
2 //
3 //                     The LLVM Compiler Infrastructure
4 //
5 // This file is dual licensed under the MIT and the University of Illinois Open
6 // Source Licenses. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 
10 // <queue>
11 
12 // priority_queue();
13 
14 // template <class T, class Container, class Compare>
15 //   void swap(priority_queue<T, Container, Compare>& x,
16 //             priority_queue<T, Container, Compare>& y);
17 
18 #include <queue>
19 #include <cassert>
20 
main()21 int main()
22 {
23     std::priority_queue<int> q1;
24     std::priority_queue<int> q2;
25     q1.push(1);
26     q1.push(3);
27     q1.push(2);
28     swap(q1, q2);
29     assert(q1.empty());
30     assert(q2.size() == 3);
31     assert(q2.top() == 3);
32 }
33