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Are variables passed as parameters local?

BlitzMax Forums/BlitzMax Beginners Area/Are variables passed as parameters local?

Fry Crayola(Posted 2005) [#1]
I couldn't find anything in the help, so I'm a bit unsure.

If I have a type, with a method inside it, say

Type Person

Method doSomething(x:Int = 0)

end type


Is the X variable local? I assume so but I can't explicitly declare it as Method doSomething(local x:Int = 0) so I just want to be 100% on the matter.

Cheers.


Curtastic(Posted 2005) [#2]
check it out
Global x:Int=99

Type Person
	Field x:Int
	
	Method doSomething(x:Int = 0)
		Print x
		Print self.x
	EndMethod
EndType

p:person=New person
p.x=-5

p.dosomething(3)



Garred(Posted 2005) [#3]
It is possible to be acceded to the global variable X from doSomething?


semar(Posted 2005) [#4]
It is possible to be acceded to the global variable X from doSomething?

No, since doSomething is a method, and x has been declared as field; thus, it substitutes the Global X variable.

[EDIT]
It IS possible, by preceeding a period to the global variable name: .X
Check the below post by Beaker
[/EDIT]

But you can if you refer to X from within a Function in the type:
function DoSomethingElse()
print x
end function

'and call it with
Person.DoSomethingElse
'accordingly with the code in the 2nd post, it will print 99
Anyway bare in mind that if you declare a function which accepts X as parameter, then the Global X value will be ignored again.

Anyway, the best way to try these concepts is to practice yourself with it.

And a good programmig habit is to differentiate such variables so that there are no misunderstanding.

Sergio.


Beaker(Posted 2005) [#5]
You can access an external global like this:
Strict

Global x = 1

Type thing
	
	Method meth(x=2)
		DebugLog "method "+x
		DebugLog "external global "+(.x)
	End Method

	Function func(x=3)
		DebugLog "function "+x
	End Function
End Type

Local th:thing = New thing
th.meth()
thing.func()

DebugStop
End



Curtastic(Posted 2005) [#6]
wow the access for the global is (.variable)
I was hoping for a word instead of a symbol, but hey at least it is possible.
Why isn't SELF a command anymore?


Perturbatio(Posted 2005) [#7]
Why isn't SELF a command anymore?

ummm... it is.


Curtastic(Posted 2005) [#8]
oh ya, but then it should highlight it when I type "self.x"


Perturbatio(Posted 2005) [#9]
it does seem to highlight but not if there's a . seperator after it.