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 // void pop();
12 
13 #include <queue>
14 #include <cassert>
15 
16 int main(int, char**)
17 {
18     std::queue<int> q;
19     assert(q.size() == 0);
20     q.push(1);
21     q.push(2);
22     q.push(3);
23     assert(q.size() == 3);
24     assert(q.front() == 1);
25     assert(q.back() == 3);
26     q.pop();
27     assert(q.size() == 2);
28     assert(q.front() == 2);
29     assert(q.back() == 3);
30     q.pop();
31     assert(q.size() == 1);
32     assert(q.front() == 3);
33     assert(q.back() == 3);
34     q.pop();
35     assert(q.size() == 0);
36 
37   return 0;
38 }
39