libcxx/test/std/containers/container.adaptors/stack/stack.defn/swap.pass.cpp

//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

// <stack>

// void swap(stack& q);

#include <stack>
#include <cassert>

#include "test_macros.h"

template <class C>
C make(int n) {
  C c;
  for (int i = 0; i < n; ++i)
    c.push(i);
  return c;
}

int main(int, char**) {
  std::stack<int> q1      = make<std::stack<int> >(5);
  std::stack<int> q2      = make<std::stack<int> >(10);
  std::stack<int> q1_save = q1;
  std::stack<int> q2_save = q2;
  q1.swap(q2);
  assert(q1 == q2_save);
  assert(q2 == q1_save);

  return 0;
}