How to pass a method into a function

BlitzMax Forums/BlitzMax Programming/How to pass a method into a function

Grey Alien

(Posted 2007) [#1]

please consider this code:

Strict
Type Ta
	Method b()
	End Method
	
	Function c()
	End Function
End Type

Local a:Ta = New Ta

test(a.b)
test(Ta.c)

Function test(z())
	Print "something"
End Function

It won't compile because it won't let me pass a method b() into the test function. If you comment out the duff line, the function c() can be passed in fine.

Don't suppose there's another way to do this apart from turning my method into a function and putting "self." in front of anything important?

Damien Sturdy

(Posted 2007) [#2]

test(a.b())

should do it...?

I use Superstrict and this forces me to have the return type declared with the method:

Method B:ReturnType()
End Method

...

test(a.b())

Who was John Galt?

(Posted 2007) [#3]

No method pointers in Max. Turn it into a func or wrap it in a func to do this.l

Dreamora

(Posted 2007) [#4]

Or wait for the changes mark mentions in his worklog as the reflection feature should actually allow that (he points that out with his pseudo delegate part as well)

Azathoth

(Posted 2007) [#5]

You could implement a SendMessage() method that all types have anyway and have the function call it.

Its not the same thing but can be used similiar:

Strict
Type Ta
	Method SendMessage:Object( message:Object,sender:Object )
		If String(message)="b"
			Print "the message is b"
			
		ElseIf String(message)="c"
			Print "the message is c"
		Else
			Print "unknown message"
		EndIf
	EndMethod
End Type

Local a:Ta = New Ta

test(a,"b")
test(a,"c")
test(a,"x")

Function test(z:Object,s:String)
	z.SendMessage(s,Null)
	Print "something"
End Function

Grey Alien

(Posted 2007) [#6]

No method pointers in Max. Turn it into a func or wrap it in a func to do this.

suspected as much.

Thanks all.

Azathoth: thanks. Yeah I wanted to pass in the method so I could actually call it. That much wasn't clear in my example.