A symbol naming the foreign structure type.
A string giving the foreign structure name.
A symbol naming a foreign structure type alias.
A symbol naming the foreign slot.
An FLI type descriptor for the foreign slot.
defines a foreign structure type called
with the given
s. In addition, the type becomes an Objective-C type that can be used with invoke, invoke-into and define-objc-method or define-objc-class-method.
LispWorks Objective-C and Cocoa Interface User Guide and Reference Manual - 15 Dec 2011