subclassing defstruct with defclass?

Dear list,

I had code working fine in LW 6 that was like:

	(defstruct foo a b c)

	(defclass bar (foo) (x y z))


Lispworks 7 does not like this, and says that FOO is an invalid superclass of BAR.
Can someone help me understand what is wrong with it?
I thought structures were valid CLOS classes...


All the best,
Cam


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Re: subclassing defstruct with defclass?

Hi,

ANSI CL doesn’t give any guarantees that this should work, so in general, you should assume that it doesn’t. (Same for define-condition.)

Pascal

On 12 Dec 2016, at 11:35, Camille Troillard <camille.troillard@icloud.com> wrote:

Dear list,

I had code working fine in LW 6 that was like:

(defstruct foo a b c)

(defclass bar (foo) (x y z))

Lispworks 7 does not like this, and says that FOO is an invalid superclass of BAR.
Can someone help me understand what is wrong with it?
I thought structures were valid CLOS classes...

All the best,
Cam

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Re: subclassing defstruct with defclass?

Thank you Pascal,

It's great to see LW is more strict.

On 12 Dec 2016, at 13:06, Costanza, Pascal <pascal.costanza@intel.com> wrote:

Hi,

ANSI CL doesn’t give any guarantees that this should work, so in general, you should assume that it doesn’t. (Same for define-condition.)

Pascal

On 12 Dec 2016, at 11:35, Camille Troillard <camille.troillard@icloud.com> wrote:

Dear list,

I had code working fine in LW 6 that was like:

(defstruct foo a b c)

(defclass bar (foo) (x y z))

Lispworks 7 does not like this, and says that FOO is an invalid superclass of BAR.
Can someone help me understand what is wrong with it?
I thought structures were valid CLOS classes...

All the best,
Cam

Re: subclassing defstruct with defclass?

LispWorks has always been strict about this AFAIK.

-- 
Martin Simmons
LispWorks Ltd
http://www.lispworks.com/


>>>>> On Mon, 12 Dec 2016 13:47:05 +0100, Camille Troillard said:
> 
> Thank you Pascal,
> 
> It's great to see LW is more strict.
> 
> 
> 
> 
> > On 12 Dec 2016, at 13:06, Costanza, Pascal <pascal.costanza@intel.com> wrote:
> > 
> > Hi,
> > 
> > ANSI CL doesn’t give any guarantees that this should work, so in general, you should assume that it doesn’t. (Same for define-condition.)
> > 
> > Pascal
> > 
> >> On 12 Dec 2016, at 11:35, Camille Troillard <camille.troillard@icloud.com <mailto:camille.troillard@icloud.com>> wrote:
> >> 
> >> Dear list,
> >> 
> >> I had code working fine in LW 6 that was like:
> >> 
> >> (defstruct foo a b c)
> >> 
> >> (defclass bar (foo) (x y z))
> >> 
> >> 
> >> Lispworks 7 does not like this, and says that FOO is an invalid superclass of BAR.
> >> Can someone help me understand what is wrong with it?
> >> I thought structures were valid CLOS classes...
> >> 
> >> 
> >> All the best,
> >> Cam
> 
> 

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