A sequence of one or more slots making up the structure.
A symbol naming the slot.
The slot type. If no type is given it defaults to an :int .
The FLI :struct type is an aggregate type, and converts between a Lisp object and a C struct type. The FLI structure consists of a collection of one or more slots. Each slot has a name and a type.
The foreign-slot-names, foreign-slot-type, and foreign-slot-value functions can be used to access and change the slots of the structure. The convenience FLI function define-c-struct is provided to simplify the definition of structures.
In the following example a structure for passing coordinates to Windows functions is defined.
(fli:define-c-struct tagPOINT (x :long) (y :long)) An instance of the structure is allocated and bound to the Lisp variable place .
(setq place
(fli:allocate-foreign-object :type 'tagPOINT))
Finally, the x slot of place is set to be 4 using fli:foreign-slot-value .
(seft (fli:foreign-slot-value place 'x) 4)