[Openmcl-devel] defstruct - generic constructor?

Laughing Water lw at mt.net
Wed Apr 29 13:56:51 PDT 2009

Fortunately, the even more obvious solution works!

Whenever you use defstruct, you're also getting a constructor. For  

(defstruct probe time temperature)

(setf *my-probe* (make-probe))

Others more advanced than me will give a more complete answer.

Laughing Water

On Apr 29, 2009, at 2:26 PM, David Reitter wrote:

> I've been trying to make instances of objects whose types have been
> defined using `defstruct'.
> Unfortunately, the obvious `make-instance' doesn't work (with ccl at
> least).  I'm glad, however, that `class-of' and `class-name' do their
> jobs.
> The only way I got this to work was this clumsy hack:
> (apply (read-from-string (format nil "make-~a" (class-name chunk- 
> type)))
> ...)
> Is there a nicer, more efficient way of doing this?
> I'd need to find out what the constructor is for a given class.
> Reading the `defstruct'  code didn't help me much.
> In more general terms, can I expect that `class-of' and `class-name'
> work for structures in other CL implementations?
> Thanks for your input.
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