30 lines · cpp
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-exception6//7//===----------------------------------------------------------------------===//8 9// <queue>10 11// const_reference front() const;12 13#include <queue>14#include <cassert>15 16#include "test_macros.h"17 18int main(int, char**) {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.front();26 assert(cir == 1);27 28 return 0;29}30