SystemVerilog: Mailboxes and Queues

Mailboxes and queues are couple of basic data constructs of system verilog language.
Lets get to the definition of them:

Queue:

A Queue in system verilog function as the name suggests. But with a twist.
Queue in system verilog is a list of similar elements. Queue is built on top of an array.

Delcaration of a queue.

<TYPE> <que_name>[$];

Default Behaviour:
The default size of the queue in system verilog is "Infinite". The above declaration will create a que of infinite length. You can add elements to the que until your simulator crashes :)
What if you want to create a queue of finite length. Just look at the declaration below:

<TYPE> <que_name>[$:<LIMIT>];

The above declaration will create a queue of size "LIMIT+1"

Initializing queue with elements

Accessing elements of a queue

Methods in queue

Inserting elements into queue

Reoving elements from queue

http://www.project-veripage.com/queue_1.php Now some points to ponder
Q. What happens when you pop from empty queue.
Ans. When you pop an empty queue, the result depends on type of the queue.
* When you pop from a queue of prebuilt data types, like integer, bit, real... The return value is '0'.
* When you pop from queue of some class, the result is null object.
Q. What happens when you push into queue which is finite and full.