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Why does code like this (Visitor Pattern):
class User
sub invite(b as Visitor)
b.visitUser(me)
end sub
sub doSomething()
end sub
end class
class Visitor
sub visitUser(a as User)
a.doSomething()
end sub
end class
work in one class lib, but not when seperated into two libs ("Illegal Circular use")?
This makes some OOP concepts (in this case Visitors, which call the User back) impossible when seperating code into different libs or you get huge script libs (ls.doc only work with so long libs and it also means you touch all code when you just want to change one bit).
Please make this error go away!
|
1) Bill McNaughton40 (24 Mar 2008)
Agree, problem's been there since R5 and does impose unnecessary constraints when trying to build modular script library designs.
2) Rob Goudvis6575 (25 Mar 2008)
Yes, please: can't wait until this implementation!
3) Willy L53 (08 Sep 2008)
First, your code doesn't compile. It has two errors.
Second, you can use two libraries just fine.
UserLib
Class User
Sub invite(b As Variant)
b.visitUser Me
End Sub
Sub doSomething()
End Sub
End Class
VisitorLib
Class Visitor
Sub visitUser(a As Variant)
Call a.doSomething()
End Sub
End Class
Agent Visitor Test
Options
Use "UserLib"
Use "VistorLib"
Sub Initialize
Dim User As New User
Dim Visitor As New Visitor
Call Visitor.VisitUser( User )
End sub
Second, you can use two libraries just fine.
UserLib
Class User
Sub invite(b As Variant)
b.visitUser Me
End Sub
Sub doSomething()
End Sub
End Class
VisitorLib
Class Visitor
Sub visitUser(a As Variant)
Call a.doSomething()
End Sub
End Class
Agent Visitor Test
Options
Use "UserLib"
Use "VistorLib"
Sub Initialize
Dim User As New User
Dim Visitor As New Visitor
Call Visitor.VisitUser( User )
End sub
4) Jan Schulz4383 (18 Nov 2008)
@3: this is using variants, so is not compile save :-(
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