libcxx/test/std/containers/container.adaptors/queue/queue.special/swap.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 // template <class T, class Container>
  12 //   void swap(queue<T, Container>& x, queue<T, Container>& y);
  13
  14 #include <queue>
  15 #include <cassert>
  16
  17 #include "test_macros.h"
  18
  19 template <class C>
  20 C
  21 make(int n)
  22 {
  23     C c;
  24     for (int i = 0; i < n; ++i)
  25         c.push(i);
  26     return c;
  27 }
  28
  29 int main(int, char**)
  30 {
  31     std::queue<int> q1 = make<std::queue<int> >(5);
  32     std::queue<int> q2 = make<std::queue<int> >(10);
  33     std::queue<int> q1_save = q1;
  34     std::queue<int> q2_save = q2;
  35     swap(q1, q2);
  36     assert(q1 == q2_save);
  37     assert(q2 == q1_save);
  38
  39   return 0;
  40 }