libcxx/test/std/containers/container.adaptors/queue/queue.defn/back_const.pass.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-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
  18 int 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 }