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 // reference front();
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     int& ir = q.front();
24     assert(ir == 1);
25 
26   return 0;
27 }
28