Object to pointer and back ... ?

BlitzMax Forums/BlitzMax Programming/Object to pointer and back ... ?

AndyGFX

(Posted 2009) [#1]

I found this nice solution:

/* Simple Functions to translate Object to Pointer and Back */
/* Note Use of char* as pointers */
char* ObjectToBytePtr(char* AObject) { return AObject;}
char* BytePtrToObject(char* AObject) { return AObject;}

but i looking for a BMX only solution.
Howto convert pointer to object (type) back to object (type) ?

N	(Posted 2009) [#2]

I don't know why you'd want to do this, but:

Private
Function i_objptr:Byte Ptr( p:Byte Ptr )
	Return p
End Function
Public
Global ObjectToPointer:Byte Ptr(o:Object) = Byte Ptr(i_objptr)
Global PointerToObject:Object(p:Byte Ptr) = Byte Ptr(i_objptr)

JoshK

(Posted 2009) [#3]

Watch out for Null objects.

Function ObjectPointer:Byte Ptr(o:Object)
	If o=Null Return Null
	Local p:Byte Ptr
	p=o
	p:-8
	Return p
EndFunction

N	(Posted 2009) [#4]

That's something you should probably test for outside of the function.

AndyGFX

(Posted 2009) [#5]

Thanks a lot.