setting member variable in child class

[Altman]

I have a class that I want many others inherited off of. I have created a
variable in the parent class that I want the inherited classes to set. But
I do not want to set the variable in the constructor. Ex.

Class A
protected myVar as string
END Class

Class B
inherits A
'set the myVar Variable
myVar = "Class B"

End Class

I need Class A to have access to the myVar so I can't use shadows and
redeclare it. This seems like it should be trivial but I can't figure it
out. The reason I don't want to use a constructo in class B is because I
built the overloaded contructors in class A and do not want to override each
one of them everytime I inherit class A.


--
TIA

Altman

[Larry Lard]

Re: setting member variable in child class


Altman wrote:[color=blue]
> I have a class that I want many others inherited off of. I have created a
> variable in the parent class that I want the inherited classes to set. But
> I do not want to set the variable in the constructor. Ex.
>
> Class A
> protected myVar as string
> END Class
>
> Class B
> inherits A
> 'set the myVar Variable
> myVar = "Class B"
>
> End Class
>
> I need Class A to have access to the myVar so I can't use shadows and
> redeclare it. This seems like it should be trivial but I can't figure it
> out. The reason I don't want to use a constructo in class B is because I
> built the overloaded contructors in class A and do not want to override each
> one of them everytime I inherit class A.[/color]

You're going to have to do that though. You can't inherit constructor
implementations . You're going to have to have overloaded constructors
for each class dervied from A - these can call MyBase.New(what ever), if
you like. Initialize myVar in them.

--
Larry Lard
Replies to group please

[Altman]

Re: setting member variable in child class

I was hoping I wouldn't have to do that because I have 4 different
constructors for class A and didn't want to have to in turn make 4 different
constructors for class b just so it can set the myvar and then call
mybase.new().


"Larry Lard" <larrylard@hotm ail.com> wrote in message
news:1132074680 .503539.234920@ z14g2000cwz.goo glegroups.com.. .[color=blue]
>
> Altman wrote:[color=green]
>> I have a class that I want many others inherited off of. I have created
>> a
>> variable in the parent class that I want the inherited classes to set.
>> But
>> I do not want to set the variable in the constructor. Ex.
>>
>> Class A
>> protected myVar as string
>> END Class
>>
>> Class B
>> inherits A
>> 'set the myVar Variable
>> myVar = "Class B"
>>
>> End Class
>>
>> I need Class A to have access to the myVar so I can't use shadows and
>> redeclare it. This seems like it should be trivial but I can't figure it
>> out. The reason I don't want to use a constructo in class B is because I
>> built the overloaded contructors in class A and do not want to override
>> each
>> one of them everytime I inherit class A.[/color]
>
> You're going to have to do that though. You can't inherit constructor
> implementations . You're going to have to have overloaded constructors
> for each class dervied from A - these can call MyBase.New(what ever), if
> you like. Initialize myVar in them.
>
> --
> Larry Lard
> Replies to group please
>[/color]

[Chris]

Re: setting member variable in child class

Altman wrote:[color=blue]
> I was hoping I wouldn't have to do that because I have 4 different
> constructors for class A and didn't want to have to in turn make 4 different
> constructors for class b just so it can set the myvar and then call
> mybase.new().
>
>
> "Larry Lard" <larrylard@hotm ail.com> wrote in message
> news:1132074680 .503539.234920@ z14g2000cwz.goo glegroups.com.. .
>[color=green]
>>Altman wrote:
>>[color=darkred]
>>>I have a class that I want many others inherited off of. I have created
>>>a
>>>variable in the parent class that I want the inherited classes to set.
>>>But
>>>I do not want to set the variable in the constructor. Ex.
>>>
>>>Class A
>>> protected myVar as string
>>>END Class
>>>
>>>Class B
>>> inherits A
>>> 'set the myVar Variable
>>> myVar = "Class B"
>>>
>>>End Class
>>>
>>>I need Class A to have access to the myVar so I can't use shadows and
>>>redeclare it. This seems like it should be trivial but I can't figure it
>>>out. The reason I don't want to use a constructo in class B is because I
>>>built the overloaded contructors in class A and do not want to override
>>>each
>>>one of them everytime I inherit class A.[/color]
>>
>>You're going to have to do that though. You can't inherit constructor
>>implementatio ns. You're going to have to have overloaded constructors
>>for each class dervied from A - these can call MyBase.New(what ever), if
>>you like. Initialize myVar in them.
>>
>>--
>>Larry Lard
>>Replies to group please
>>[/color]
>
>
>[/color]

Why doesn't Class A require that the myVar is set in the 4 Class A
constructors?

Chris

[Altman]

Re: setting member variable in child class

OK I came up with a work around if anyone cares.
create a mustoverride method in class A ex (fillClassVaria bles). In each of
my constructors for class A I will call that fillClassVariab les. In class
b, in the fillClassVariab les method, fill in the variables I need. This
makes it so I do not need to recreate my constructors.

example

Class A
protected myVar as string
protected mustoverride function fillClassVariab les
public sub new()
fillClassVariab les
'do stuff
end sub
public sub new(var1)
fillClassVariab les
'do stuff
end sub
public sub new(var1,var2)
fillClassVariab les
'do stuff
end sub
END Class

Class B
inherits A
protected overrides function fillclassvariab les
myVar = "Class B"
end function

End Class



"Larry Lard" <larrylard@hotm ail.com> wrote in message
news:1132074680 .503539.234920@ z14g2000cwz.goo glegroups.com.. .[color=blue]
>
> Altman wrote:[color=green]
>> I have a class that I want many others inherited off of. I have created
>> a
>> variable in the parent class that I want the inherited classes to set.
>> But
>> I do not want to set the variable in the constructor. Ex.
>>
>> Class A
>> protected myVar as string
>> END Class
>>
>> Class B
>> inherits A
>> 'set the myVar Variable
>> myVar = "Class B"
>>
>> End Class
>>
>> I need Class A to have access to the myVar so I can't use shadows and
>> redeclare it. This seems like it should be trivial but I can't figure it
>> out. The reason I don't want to use a constructo in class B is because I
>> built the overloaded contructors in class A and do not want to override
>> each
>> one of them everytime I inherit class A.[/color]
>
> You're going to have to do that though. You can't inherit constructor
> implementations . You're going to have to have overloaded constructors
> for each class dervied from A - these can call MyBase.New(what ever), if
> you like. Initialize myVar in them.
>
> --
> Larry Lard
> Replies to group please
>[/color]

[Altman]

Re: setting member variable in child class

OK so this is something I didn't realize. The overloaded constructor does
not carry down to the inherited class. Is this right? Is this the same in
C# or J#?


"Altman" <NotGiven@SickO fSpam.com> wrote in message
news:%23KU3yFg6 FHA.268@TK2MSFT NGP10.phx.gbl.. .[color=blue]
>I have a class that I want many others inherited off of. I have created a
>variable in the parent class that I want the inherited classes to set. But
>I do not want to set the variable in the constructor. Ex.
>
> Class A
> protected myVar as string
> END Class
>
> Class B
> inherits A
> 'set the myVar Variable
> myVar = "Class B"
>
> End Class
>
> I need Class A to have access to the myVar so I can't use shadows and
> redeclare it. This seems like it should be trivial but I can't figure it
> out. The reason I don't want to use a constructo in class B is because I
> built the overloaded contructors in class A and do not want to override
> each one of them everytime I inherit class A.
>
>
> --
> TIA
>
> Altman
>
>
>[/color]

[Altman]

Re: setting member variable in child class

>[color=blue]
> Why doesn't Class A require that the myVar is set in the 4 Class A
> constructors?
>[/color]

Because I have methods of class A that use the myVar but I they are
different depending on the inherited class. Therefore the inherited class
needs to set the value of these variables.

[Chris]

Re: setting member variable in child class

Altman wrote:[color=blue]
> OK I came up with a work around if anyone cares.
> create a mustoverride method in class A ex (fillClassVaria bles). In each of
> my constructors for class A I will call that fillClassVariab les. In class
> b, in the fillClassVariab les method, fill in the variables I need. This
> makes it so I do not need to recreate my constructors.
>
> example
>
> Class A
> protected myVar as string
> protected mustoverride function fillClassVariab les
> public sub new()
> fillClassVariab les
> 'do stuff
> end sub
> public sub new(var1)
> fillClassVariab les
> 'do stuff
> end sub
> public sub new(var1,var2)
> fillClassVariab les
> 'do stuff
> end sub
> END Class
>
> Class B
> inherits A
> protected overrides function fillclassvariab les
> myVar = "Class B"
> end function
>
> End Class
>
>
>
> "Larry Lard" <larrylard@hotm ail.com> wrote in message
> news:1132074680 .503539.234920@ z14g2000cwz.goo glegroups.com.. .
>[color=green]
>>Altman wrote:
>>[color=darkred]
>>>I have a class that I want many others inherited off of. I have created
>>>a
>>>variable in the parent class that I want the inherited classes to set.
>>>But
>>>I do not want to set the variable in the constructor. Ex.
>>>
>>>Class A
>>> protected myVar as string
>>>END Class
>>>
>>>Class B
>>> inherits A
>>> 'set the myVar Variable
>>> myVar = "Class B"
>>>
>>>End Class
>>>
>>>I need Class A to have access to the myVar so I can't use shadows and
>>>redeclare it. This seems like it should be trivial but I can't figure it
>>>out. The reason I don't want to use a constructo in class B is because I
>>>built the overloaded contructors in class A and do not want to override
>>>each
>>>one of them everytime I inherit class A.[/color]
>>
>>You're going to have to do that though. You can't inherit constructor
>>implementatio ns. You're going to have to have overloaded constructors
>>for each class dervied from A - these can call MyBase.New(what ever), if
>>you like. Initialize myVar in them.
>>
>>--
>>Larry Lard
>>Replies to group please
>>[/color]
>
>
>[/color]

After reading that I was wondering if knew you didn't have to "recreate"
your constructors, you just a have to copy the definitions of the
contrutors.

Public Class A
sub new(1, 2, 3)
....
end sub
sub new(1, 2, 3, 4)
....
end sub
end class

Public Class B
sub new(1, 2, 3)
mybase.new(1,2, 3)
do soemthing else
end sub
sub new(1, 2, 3, 4)
mybase.new(1,2, 3,4)
do soemthing else
end sub
end class

[Kerry Moorman]

Re: setting member variable in child class

Altman,

That's right, instructors are not inherited.

The first line of code in an inherited class's constructor must call the
appropriate constructor in the base class: Mybase.New (...)

Kerry Moorman


"Altman" wrote:
[color=blue]
> OK so this is something I didn't realize. The overloaded constructor does
> not carry down to the inherited class. Is this right? Is this the same in
> C# or J#?
>
>
> "Altman" <NotGiven@SickO fSpam.com> wrote in message
> news:%23KU3yFg6 FHA.268@TK2MSFT NGP10.phx.gbl.. .[color=green]
> >I have a class that I want many others inherited off of. I have created a
> >variable in the parent class that I want the inherited classes to set. But
> >I do not want to set the variable in the constructor. Ex.
> >
> > Class A
> > protected myVar as string
> > END Class
> >
> > Class B
> > inherits A
> > 'set the myVar Variable
> > myVar = "Class B"
> >
> > End Class
> >
> > I need Class A to have access to the myVar so I can't use shadows and
> > redeclare it. This seems like it should be trivial but I can't figure it
> > out. The reason I don't want to use a constructo in class B is because I
> > built the overloaded contructors in class A and do not want to override
> > each one of them everytime I inherit class A.
> >
> >
> > --
> > TIA
> >
> > Altman
> >
> >
> >[/color]
>
>
>[/color]