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 17 int 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