public int Ds\Deque::capacity( void )

<?php 
   deque = new \Ds\Deque();   echo(" The default size of deque:");   var_dump(deque->capacity()); 

   deque->allocate(30);    echo("The allocated size of deque:");   var_dump(deque->capacity()); 
?>

<?php 
   deque = new \Ds\Deque([1, 2, 3, 4, 5, 6]);   echo("The elements of deque:");   var_dump(deque); 

   echo("\n The capacity of a deque:"); 
   var_dump($deque->capacity()); 
?>