On 15 Feb 2017, at 11:24, denker <marcus.denker@inria.fr> wrote:

On 15 Feb 2017, at 10:56, Ben Coman <btc@openinworld.com> wrote:



On Wed, Feb 15, 2017 at 3:38 PM, Alistair Grant <akgrant0710@gmail.com> wrote:
I'm developing a number of classes where it would be convenient to be
able to inspect what might be described as calculated attributes, i.e.
the result of a unary message send.�� The result isn't stored in an
instance variable, but is still useful when inspecting.

I can obviously develop an inspector extension for my application, but
was wondering if there is a framework in place that allows a list of
attributes to be declared that can also be inspected in a similar
fashion to normal instance variables.

Many thanks to Doru and everyone who has contributed to the GT Inspector
framework.�� It has significantly influenced my development and the
architecture of the software I'm currently working on (in a positive
way, of course).


Would it be feasible to have a "CalculationSlot"
that was read only, and each time it was read it performed the calculation?

Using a ���virtual��� slot would be possible��� it would look like a instance variable,
(you can read from it and the calculation is done).

I added this as an example to the Slot package:��

https://pharo.fogbugz.com/f/cases/19709/add-example-ComputedSlot

Changes:

- Name is ���ComputedSlot���

- added #= and #hash so changing the block is possible in the class definition

- do not raise error but ignore writes to not interfere with object migration done by

�� �� �� �� ��the class builder (e.g. when adding an ivar).

I will add that as an example to the image.