Invokes the Objective-C retainCount method.
objc
retain-count pointer => retain-count
| pointer⇩ | 
A pointer to an Objective-C foreign object. | 
| retain-count | 
An integer. | 
The function retain-count calls the Objective-C retainCount instance method of pointer to return its retain count.
LispWorks Objective-C and Cocoa Interface User Guide and Reference Manual - 18 Feb 2025 15:39:48