Declare for Arrays, Lists, Variables, Structures

c4s · Post by **c4s** » Thu Jun 16, 2011 9:19 pm

Maybe I missed something obvious that dismisses my feature request but I don't see why Declare only works for procedures. I think it's equally important for structures, arrays, lists etc.

Code: Select all

Structure AA
	AA.a
EndStructure

Structure AABB
	v1.AA
	v2.BB
EndStructure

Structure BB
	BB.b
EndStructure

STARGÅTE · Post by **STARGÅTE** » Thu Jun 16, 2011 9:25 pm

Why?
Procedures can call each other, structures not!
So why?

Use this, where is the problem?

Code: Select all

Structure AA
   AA.a
EndStructure

Structure BB
   BB.b
EndStructure 

Structure AABB
   v1.AA
   v2.BB
EndStructure

skywalk · Post by **skywalk** » Thu Jun 16, 2011 9:48 pm

STARGÅTE wrote:Why?
Procedures can call each other, structures not!

umm, ts-soft shows otherwise

http://www.purebasic.fr/english/viewtop ... 25#p344825

c4s · Post by **c4s** » Thu Jun 16, 2011 9:58 pm

Damnit why not? Why do we have Declare anyway? It makes coding easier!

I came across this when trying to seperate my main code file into several ones. Now I have this issue that I declare some structures in an include but want to define it in the main code file before including it because there are also variables used in the seperate file that are defined before it and so on... you don't have to understand the logic I'm trying to explain. It's just that declaring structures etc. could be handy in this case and I don't see a reason why it isn't possible.

When things are getting larger you want to have a certain code structure... In my small example I don't want reorder it because I want it like that, you know?

STARGÅTE · Post by **STARGÅTE** » Thu Jun 16, 2011 10:34 pm

Damnit why not? Why do we have Declare anyway? It makes coding easier!

No!, Declare for procedures make it run!

Struktur never locks like:

Code: Select all

Structure AA
  A.BB
EndStructure
Structure BB
  B.AA
EndStructure

Procedure can it, so here we need a Declare!

PS: for structures in PB a use my extension *.pbh so i declare all structures before

i think it is not easier to write some like:

Code: Select all

DeclareStructure BB

Structure AA
  A.BB
EndStructure
  
Structure BB
  B.i
EndStructure

luis · Post by **luis** » Thu Jun 16, 2011 10:47 pm

To answer your question: "Why do we have Declare anyway?"

It's to make code possible, not easier unfortunately.

Mutually recursive code: how can you write that without declares with a single pass compiler ?

Code: Select all

Declare 	a()
Declare 	b()

Procedure a()
 Debug "a"
 If Random(1)
  b()
 EndIf
EndProcedure

Procedure b()
 Debug "b"
 If Random(1)
  a()
 EndIf
EndProcedure

a()

The same it's not needed for data, afaik.

Anyway, even assuming they can be useful, I shudder at the idea of maintain declares for procedures AND linked list, structures, arrays. Having redundant declarations in my code it's not something I'm looking forward to, but for procedures this is a needed evil. Well, just an opinion

Demivec · Post by **Demivec** » Fri Jun 17, 2011 4:14 am

c4s wrote:Maybe I missed something obvious that dismisses my feature request but I don't see why Declare only works for procedures. I think it's equally important for structures, arrays, lists etc.

For structures it can be done via pointers. It can cause some headaches, but it is how it can currently be accomplished.

Code: Select all

Structure AABB
  *v1.AA
  *v2.BB
EndStructure

Structure AA
  AA.a
EndStructure

Structure BB
  BB.b
EndStructure

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