Returns the number of objects currently in a mailbox.
mp
mailbox-count mailbox => count
mailbox
A mailbox.
count
A non-negative integer.
The function mailbox-count returns the number of objects currently in the mailbox mailbox .
mailbox-count
mailbox should be an object of type mp:mailbox .
mp:mailbox
A mailbox is empty if its count is 0 .
0
mailbox-empty-p mailbox-not-empty-p make-mailbox
LispWorks User Guide and Reference Manual - 21 Dec 2011