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 // template <class T, class Container>
12 //   void swap(queue<T, Container>& x, queue<T, Container>& y);
13 
14 #include <queue>
15 #include <cassert>
16 
17 template <class C>
18 C
19 make(int n)
20 {
21     C c;
22     for (int i = 0; i < n; ++i)
23         c.push(i);
24     return c;
25 }
26 
27 int main(int, char**)
28 {
29     std::queue<int> q1 = make<std::queue<int> >(5);
30     std::queue<int> q2 = make<std::queue<int> >(10);
31     std::queue<int> q1_save = q1;
32     std::queue<int> q2_save = q2;
33     swap(q1, q2);
34     assert(q1 == q2_save);
35     assert(q2 == q1_save);
36 
37   return 0;
38 }
39