




A string naming an Objective-C class or a pointer to an Objective-C foreign object.
A string naming the method to invoke.
Arguments to the method.
The function invoke-bool is used to call Objective-C instance and class methods that return the type BOOL. It behaves identically to invoke, except that if the return value is NO then nil is returned, otherwise t is returned.
LispWorks Objective-C and Cocoa Interface User Guide and Reference Manual - 15 Feb 2015