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C++ Queue Library - swap() Function
Description
The C++ function std::priority_queue::swap() exchanges the contents of priority_queue with contents of another priority_queue.
Declaration
Following is the declaration for std::priority_queue::swap() function form std::queue header.
C++11
void swap (priority_queue& x) noexcept;
Parameters
x − Another prioriy_queue object of same type.
Return value
None.
Exceptions
This member function never throws exception.
Time complexity
Constant i.e. O(1)
Example
The following example shows the usage of std::priority_queue::swap() function.
#include <iostream> #include <queue> using namespace std; int main(void) { auto it1 = {3, 1, 5, 2, 4}; auto it2 = {5, 2, 4}; priority_queue<int> q1(less<int>(), it1); priority_queue<int> q2(less<int>(), it2); q1.swap(q2); cout << "Contents of q1 after swap operation" << endl; while (!q1.empty()) { cout << q1.top() << endl; q1.pop(); } cout << "Contents of q2 after swap operation" << endl; while (!q2.empty()) { cout << q2.top() << endl; q2.pop(); } return 0; }
Let us compile and run the above program, this will produce the following result −
Contents of q1 after swap operation 5 4 2 Contents of q2 after swap operation 5 4 3 2 1
queue.htm
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