priority_queue::empty

 

Tests if a priority_queue is empty.


bool empty( ) const;

true if the priority_queue is empty; false if the priority_queue is nonempty.

Example

// pqueue_empty.cpp
// compile with: /EHsc
#include <queue>
#include <iostream>

int main( )
{
   using namespace std;

   // Declares priority_queues with default deque base container
   priority_queue <int> q1, s2;

   q1.push( 1 );

   if ( q1.empty( ) )
      cout << "The priority_queue q1 is empty." << endl;
   else
      cout << "The priority_queue q1 is not empty." << endl;

   if ( s2.empty( ) )
      cout << "The priority_queue s2 is empty." << endl;
   else
      cout << "The priority_queue s2 is not empty." << endl;
}
The priority_queue q1 is not empty.
The priority_queue s2 is empty.

Requirements

Header: <queue>

Namespace: std

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