




The FLI type ns-size is a structure type for use as the Objective-C type NSSize. The structure has two slots, :width and :height, both of foreign type :float.
When used directly in method definition or invocation, it allows automatic conversion to/from a vector of two elements of the form #(width height).
LispWorks Objective-C and Cocoa Interface User Guide and Reference Manual - 21 Mar 2017