Stats

  • Locked Locked
  • Replies 1
  • Subscribers 143
  • Views 13093
  • Members are here 0
This discussion has been locked.
You can no longer post new replies to this discussion. If you have a question you can start a new discussion

Can one add dynamically slots to a SKILL++ ?

liorscotland

Hello all.
In other languages, one can dynamically add class variables.
can one do the same in SKILL++?
Because SKILL++, AFAIK, need to have the slots defined in generation (at least examples shown).

Parents

  • Hi Lior,

    Most objects in SKILL do support this (e.g. DPLs, defstruct instances etc), but the objects created by defclass do not. This is primarily because unless the protocol is well defined, a method wouldn't necessarily know how to react - or might be expecting this data with no guarantee that it's present.

    However, I do have an enhancement CCR 1226306 which would allow you to define a method slotMissing (modelled after Common Lisp's slot-missing) which define what behaviour you want when you access a slot that doesn't exist in the definition.

    As a workaround though, you could do this:

    defclass(myClass nil ((a) (b) (props @initfunc makeTable('props nil))))
    i1=makeInstance('myClass)
    i1->a=20
    i1->props->extraSlot=200

    What I'm doing is just defining a slot containing a hash table where you can store any of these additional bits of information - and this uses the arrow operator to make it easy to use.

    Regards,

    Andrew.

Reply

  • Hi Lior,

    Most objects in SKILL do support this (e.g. DPLs, defstruct instances etc), but the objects created by defclass do not. This is primarily because unless the protocol is well defined, a method wouldn't necessarily know how to react - or might be expecting this data with no guarantee that it's present.

    However, I do have an enhancement CCR 1226306 which would allow you to define a method slotMissing (modelled after Common Lisp's slot-missing) which define what behaviour you want when you access a slot that doesn't exist in the definition.

    As a workaround though, you could do this:

    defclass(myClass nil ((a) (b) (props @initfunc makeTable('props nil))))
    i1=makeInstance('myClass)
    i1->a=20
    i1->props->extraSlot=200

    What I'm doing is just defining a slot containing a hash table where you can store any of these additional bits of information - and this uses the arrow operator to make it easy to use.

    Regards,

    Andrew.

Children
No Data

Community Guidelines

The Cadence Design Communities support Cadence users and technologists interacting to exchange ideas, news, technical information, and best practices to solve problems and get the most from Cadence technology. The community is open to everyone, and to provide the most value, we require participants to follow our Community Guidelines that facilitate a quality exchange of ideas and information. By accessing, contributing, using or downloading any materials from the site, you agree to be bound by the full Community Guidelines.