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in my game i have: a "vector2d" class (instanced as "position1"). a method "vec-add" which creates a new instance of "vector2d". a mover class (mover1), which refers to position1 and should change the values (x and y) every update cycle a sprite class (sprite1...

it doesn't have to iterate over the slots per se, but something that does shallow-copy, just without creating a new instance?
in C# f.e. there are classes (heap allocated) and structs (stack allocated). structs are treated just like ints and copied every time they are used.

i updated my post, sorry for the confusion. what i'm looking for i a function which automatically iterates over all slots and copies them one by one. (mysteries-copy-func position (vec+ position offset)) => (setf (x-of position) (x-of result)) (setf (y-of position) (y-of result)) thanks for the libr...

btw: does anybody know of a good vector implementation? i found cl-vectors and vecto which seem to be vector graphics, and GSLL which i can't get to install.

i'm using a 2D vector class to represent a position. one position instance is shared by some other class instances (sprite, mover). one of the class setfs the position, which creates a new instance however and sprite and mover refer to the old instance. is their a setf or something which only copies...

Ramarren, thanks for the exhaustive examples!
it still took me a while to get it and i think i'll stick with the parametrized approach.

does anybody know how to apply rules in Cells on class instances? i can only find examples for class definitions.

events are not quite the thing i need. thanks for the example though. i have a spacecraft sprite which depends on a position and is followed by 2 side-kicks (also sprites) which depend on an offset position relative to the spacecraft. the spacecraft position is changed by a mystical force, but every...

you guys are great, thank you! ^^ cells is exactly what i need and it looks pretty mature. they seem to call it "instance-specific formulas". (defmethod (setf foo) :after (value (object (eql a1))) haven't thought of that, thanks. the values in my game engine may change 100 times per second...

Hello fellow Lispers! i'm a newbie to Common Lisp and developing a small game engine where i want to implement the signal-slot concept of Qt . basically it means that you can specify "signals" and "slots" (not Lisp slots) for classes and connect them for some instances. everytime...