A foreign type for the Objective-C type BOOL .
BOOL
objc
objc-bool
None.
The FLI type objc-bool is a boolean type for use as the Objective-C type BOOL . It converts between nil and NO and between non-nil and YES .
nil
NO
YES
invoke-bool
LispWorks Objective-C and Cocoa Interface User Guide and Reference Manual - 15 Dec 2011