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C++ Queue Library - swap() Function
Description
The C++ function std::queue::swap() exchanges the contents of queue with contents of another queue x.
Declaration
Following is the declaration for std::queue::swap() function form std::queue header.
C++11
void swap (queue& x) noexcept;
Parameters
x − Another queue object of same type.
Return value
None
Time complexity
Constant i.e. O(1)
Example
The following example shows the usage of std::queue::swap() function.
#include <iostream> #include <queue> using namespace std; int main(void) { queue<int> q1, q2; for (int i = 0; i < 5; ++i) q1.push(i + 1); for (int i = 0; i < 2; ++i) q2.push(i + 150); q1.swap(q2); cout << "Content of q1 and q2 after swap operation" << endl;; while (!q1.empty()) { cout << q1.front() << endl; q1.pop(); } cout << endl << endl; while (!q2.empty()) { cout << q2.front() << endl; q2.pop(); } return 0; }
Let us compile and run the above program, this will produce the following result −
Content of q1 and q2 after swap operation 150 151 1 2 3 4 5
queue.htm
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