queue::size
Returns the number of elements in the queue.
size_type size( ) const;
Return Value
The current length of the queue.
Example
// queue_size.cpp
// compile with: /EHsc
#include <queue>
#include <iostream>
int main( )
{
using namespace std;
queue <int> q1, q2;
queue <int>::size_type i;
q1.push( 1 );
i = q1.size( );
cout << "The queue length is " << i << "." << endl;
q1.push( 2 );
i = q1.size( );
cout << "The queue length is now " << i << "." << endl;
}
The queue length is 1.
The queue length is now 2.
Requirements
Header: <queue>
Namespace: std