Clarion in general: New and Dispose 2005-01-07 -- Robert Peros Newsgroups: softvelocity.clarion.language
> Several months ago, maybe in 2003, there was an interesting discussion
> about how to deal with situations where you need to NEW a variable in
> a method but you can't dispose of it easily, such as:
>
> MyMethod Procedure(String pS)
> NewS &String
> Code
> NewS &= NEW STRING(Size(pS)*2)
> NewS = pS & pS
> Return(NewS)
>
> You can't dispose of this and this would cause memory leak (as far as
> I know) Some people posted a really nifty way to call the method back
> to dispose of the variable but I have lost this and don't remember
> exactly how it was done. Anyone recall this?
No,but if I correct understand, look at the ABFILE.clw(again :-))
! Choose the buffer size for a given string
! Must be at least one byte but other than that may clip
! Then allocate string and copy in value
DupString PROCEDURE(STRING St)!,*STRING
SizeIs SIGNED,AUTO
NS &STRING,AUTO
CODE
SizeIs = LEN(CLIP(St))
NS &= NEW STRING (CHOOSE(SizeIs = 0,1,SizeIs))
NS = St
RETURN NS
Return value is ref. to STRING and you have responsibility for
DISPOSE time.
R.
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