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// const_reference back() const; 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 const std::queue<int>& cqr = q; 25 const int& cir = cqr.back(); 26 assert(cir == 3); 27} 28