On 6 Feb 2019, at 13:25, Vitor Medina Cruz <vitormcruz@gmail.com> wrote:

Thanks, I was looking for usages of InstanceVariableSlot.

All instance variables are InstanceVariableSlots.��

But to make it less verbose, we have a way to specify these without having to put the name.��

Object subclass: #Point

slots: { #x. #y }

classVariables: { ��}

package: 'Kernel-BasicObjects���

is the same as

Object subclass: #Point

slots: { #x => InstanceVariableSlot . #y => InstanceVariableSlot}

classVariables: { ��}

package: 'Kernel-BasicObjects'

If you evaluate:

Point slotNamed: #x��

you see that it returns a��

�� �� #x => InstanceVariableSlot

Slot instance.

(with all that: I sometime wonder if we should not get rid of the name ���Slot��� and just use the term ���Variable������ because that is what they are���)

In the case of SlotExampleMovie, #name and #year are of IntanceVariableSlot layout (this definition is correct? A slot is or has some Layout defined by the Slot class?)

No, the class has a Layout. See subclasses of��AbstractLayout. This reifies the magic number that is in the ���format��� ivar of Behaviors (third ivar of all class like objects).

In addition it makes class definition *explicitly* specify the layout.

So Array in ST 80 is something like:

ArrayedCollection variableSubclass: #Array

instanceVariableNames: ''

classVariableNames: ''

package: 'Collections-Sequenceable-Base'

so the layout chosen is hidden in the class creation method (variableSubclass���), while with the reified layouts, it explicit:

ArrayedCollection subclass: #Array

layout: VariableLayout

slots: { ��}

classVariables: { ��}

package: 'Collections-Sequenceable-Base�����

e.g. for CompiledMethod it makes clear that is a very special class:

CompiledCode subclass: #CompiledMethod

layout: CompiledMethodLayout

slots: { ��}

classVariables: { ��}

package: 'Kernel-Methods���

On Wed, Feb 6, 2019 at 10:14 AM Marcus Denker <marcus.denker@inria.fr> wrote:

> On 6 Feb 2019, at 12:41, Denis Kudriashov <dionisiydk@gmail.com> wrote:
>
> Would be nice to have a command in browser to show users of selected slot
>

Yes!

�� �� �� �� Marcus