Hello everyone,
According to section 9.10 of the manual
("GOOPS Object Miscellany"),"When GOOPS is loaded, `write' and `display' become generic functions with special methods for printing [...] In addition to the cases mentioned, you can of course define `write' and `display' methods for your own classes, to customize how instances of those classes are printed." However, when I try to create a custom display and write method for my class from within a module (which :use-module (oop goops)), say (define-method (display (object <unique-id>) port) (display (list (class-name (class-of object)) #[object 'id]) port)) (define-method (write (object <unique-id>) port) (write (list (class-name (class-of object)) #[object 'id]) port)) I get the following error: ERROR: #<procedure display (object #:optional port)> is not a valid generic function When I use define-generic before define-method, the problem doesn't disappear, but it moves elsewhere: ERROR: No applicable method for #<<generic> display (1)> in call (some "normal" call to display) When I'm using this in the main application, ie. outside the module context, it seems to work fine, though. Am I doing something wrong? (Because this behavior seems counter-intuitive) Best regards M
