Local array going out of scope - GameCreators Forum

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Jambo B

14

Years of Service

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Joined: 17th Sep 2009

Location: The Pit

Posted: 28th Mar 2015 15:04 Edited at: 29th Mar 2015 00:20

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Hello all,

I want to avoid memory leaks. Can arrays be defined as local, and when out of scope, are they automatically deleted?

+ Code Snippet

type MyType
	sID as string
	sContents as string[0]
	iSomeOtherInteger as integer
endtype


function UseTheType()
	TempArray as MyType[0]

	for iterArray = 0 to 10
		TempArray.length = TempArray.length + 1
		TempArray[TempArray.length-1].sID = "The ID!"
		
		for iterString = 0 to 5
			TempArray[TempArray.length-1].sContents.length = TempArray[TempArray.length-1].sContents.length + 1
			TempArray[TempArray.length-1].sContents[TempArray[TempArray.length-1].sContents.length-1] = "Added string"
		next iterString
		
		TempArray[TempArray.length-1].iSomeOtherInteger = random(1,1000)
	next iterArray
	
	// ... do some other stuff with temp array

	// Will TempArray be deleted here?
endfunction

Is there anything wrong with the code above which might cause memory leaks? I tried an undim at the end of the function, but computer says no: error: Array "temparray" has not been defined.

Thanks,

James

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Markus

Valued Member

20

Years of Service

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Joined: 10th Apr 2004

Location: Germany

Posted: 28th Mar 2015 20:32 Edited at: 29th Mar 2015 04:09

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i believe u can undim with TempArray.length=-1
your code looks correct, i would also expect the memory will free up
after this function.
if the compiler make this array global there should be come an error missing
"global "
agk is a little bit uncommon at some points.
just try if you can access this out of scope.

AGK 108 (B)19 + AppGameKit V2 Alpha .. : Windows 8.1 Pro 64 Bit : AMD Radeon R7 265 : Mac mini OS X 10.10 (Yosemite)

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Mike Archer

9

Years of Service

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Joined: 19th Feb 2015

Location: Wales

Posted: 29th Mar 2015 02:03

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Local arrays/variables are deleted when the function exits, here's a quick example of code to demonstrate this, run task manager and you can see the memory get eaten up and free again as the code runs.

+ Code Snippet

REPEAT
	PRINT( "CLICK TO START FUNCTIONS" )
	SYNC()
UNTIL GETPOINTERPRESSED()

v(1)

REPEAT
    Print( "FUNCTIONS EXITED" )
    Sync()
UNTIL GETPOINTERPRESSED()

END


FUNCTION v(i)
	
	a AS INTEGER[1000,1000]
	
	PRINT(i)
	SYNC()
		
	IF i > 200 
		REPEAT
			PRINT( "CLICK TO EXIT FUNCTIONS" )
			SYNC()
		UNTIL GETPOINTERPRESSED()
		EXITFUNCTION
	ENDIF
		
	SYNC()
	
	V( i + 1)
	
ENDFUNCTION

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