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 // const_reference back() const; 12 13 #include <queue> 14 #include <cassert> 15 16 #include "test_macros.h" 17 main(int,char **)18int main(int, char**) 19 { 20 std::queue<int> q; 21 assert(q.size() == 0); 22 q.push(1); 23 q.push(2); 24 q.push(3); 25 const std::queue<int>& cqr = q; 26 const int& cir = cqr.back(); 27 assert(cir == 3); 28 29 return 0; 30 } 31