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