Re: eieio defclass evaluate :initform value

[Eric Abrahamsen]

Joe Riel <joer@san.rr.com> writes:

> According to the info page for eieio for Emacs 23, one
> could do
>
> (defclass foo-class
>    ((bar :initform (lambda () my-var)
>          :type string)))
>
> When make-instance was called, the lambda expression
> for :initform would be evaluated and the expression
> assigned to my-var would be used for the slot bar.
>
> The info page for eieio Emacs 24 does not mention this 
> functionality and testing shows it no longer exists.
>
> Is there nice way, in 24, to create a class with an :initform
> that, upon instantiation, evaluates to the value of a variable?

Depending on what exactly you want, you might be able to solve it with
`oset-default', which lives outside the class definition, and can
evaluate variables. See if that does what you want?

Eric