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// reference front();
13
14#include <queue>
15#include <cassert>
16
17int main()
18{
19    std::queue<int> q;
20    assert(q.size() == 0);
21    q.push(1);
22    q.push(2);
23    q.push(3);
24    int& ir = q.front();
25    assert(ir == 1);
26}
27