Custom types

[Joubarbe]

So you might not know that, but you can name your enumerations:

Code: Select all

Enumeration CUSTOM_TYPE
  #CUSTOM_TYPE_1
  #CUSTOM_TYPE_2
EndEnumeration

But unlike some other languages, you cannot use that as a custom type, ie. you cannot force values to be either #CUSTOM_TYPE_1 or #CUSTOM_TYPE_2. However, you can use macros to do that:

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Enumeration CUSTOM_TYPE
  #CUSTOM_TYPE_1
  #CUSTOM_TYPE_2
EndEnumeration
Macro CUSTOM_TYPE : i : EndMacro

Structure _Struc
  int.i
  custom.CUSTOM_TYPE
EndStructure

Procedure WriteCustom(custom.CUSTOM_TYPE)
  ; Something.
EndProcedure

Which I find pretty cool. When you have a big program with a ton of constants, you can easily identify what constants you need to use when you call a function or when you assign a value to a structured variable.

[idle]

thanks it's a good tip and is useful when importing large c libs

[infratec]

I use this since ... a long time ago,
for C imports:

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Enumeration pjsip_inv_state
  #PJSIP_INV_STATE_NULL           ; Before INVITE is sent Or received
  #PJSIP_INV_STATE_CALLING        ; After INVITE is sent
  #PJSIP_INV_STATE_INCOMING       ; After INVITE is received.
  #PJSIP_INV_STATE_EARLY          ; After response With To tag.
  #PJSIP_INV_STATE_CONNECTING     ; After 2xx is sent/received.
  #PJSIP_INV_STATE_CONFIRMED      ; After ACK is sent/received.
  #PJSIP_INV_STATE_DISCONNECTED   ; Session is terminated.
EndEnumeration

Macro pjsip_inv_state
  l
EndMacro

[ebs]

Thank you - this is really clever!

As you said, it doesn't enforce the use of the correct type, but it makes your code much more self-documenting.
It makes the C programmer in me very happy!

[Axolotl]

Thanks for sharing.
Indeed Marcos are very helpful as workaround solutions.
Fun Fact: I recently made a wish. Enums as a Type

[Axolotl]

...
I use this since ... a long time ago,
for C imports:

Code: Select all

Enumeration pjsip_inv_state
....
EndEnumeration

@infratec, is your code published in the forum?
The search function is a mess these days.

[infratec]

No, this code is not public.
And I'm definately not allowed to make this public.