friend class

[Boni]

Dear all,
I would like to have an access from one class to the private variables of
other. But I also can't find a right sintax. The word "friend" seems to do
something else, VB compiler still complains.
-----C++--------

class A{
private:
int K;
}
class B{
friend class A;

void test(){
A oA;
A.K=10; //acccess private member
}
}
------VB----
Please help

[Herfried K. Wagner [MVP]]

Re: friend class

"Boni" <oilia@nospam > schrieb:[color=blue]
> I would like to have an access from one class to the private variables of
> other. But I also can't find a right sintax. The word "friend" seems to do
> something else, VB compiler still complains.
> -----C++--------
>
> class A{
> private:
> int K;
> }
> class B{
> friend class A;
>
> void test(){
> A oA;
> A.K=10; //acccess private member
> }
> }[/color]

That's not supported.

--
M S Herfried K. Wagner
M V P <URL:http://dotnet.mvps.org/>
V B <URL:http://classicvb.org/petition/>

[Boni]

Re: friend class

Is there a good solution?
I would like to have most class members private for all classes except for
one special, which has special handlers. What is a good design style to do
so?
"Herfried K. Wagner [MVP]" <hirf-spam-me-here@gmx.at> schrieb im Newsbeitrag
news:OD73A9kYFH A.1412@TK2MSFTN GP12.phx.gbl...[color=blue]
> "Boni" <oilia@nospam > schrieb:[color=green]
>> I would like to have an access from one class to the private variables of
>> other. But I also can't find a right sintax. The word "friend" seems to
>> do something else, VB compiler still complains.
>> -----C++--------
>>
>> class A{
>> private:
>> int K;
>> }
>> class B{
>> friend class A;
>>
>> void test(){
>> A oA;
>> A.K=10; //acccess private member
>> }
>> }[/color]
>
> That's not supported.
>
> --
> M S Herfried K. Wagner
> M V P <URL:http://dotnet.mvps.org/>
> V B <URL:http://classicvb.org/petition/>[/color]

[Mythran]

Re: friend class


"Boni" <oilia@nospam > wrote in message
news:OyMFcQlYFH A.1344@TK2MSFTN GP15.phx.gbl...[color=blue]
> Is there a good solution?
> I would like to have most class members private for all classes except for
> one special, which has special handlers. What is a good design style to do
> so?[/color]

A similar way?

Friend Class MyClass1
Friend Name As String
Friend Address As String
End Class

Public Class MyClass2
Private mMyClass As MyClass1

Public Sub New()
mMyClass = New MyClass1()
End Sub

Public Property Name() As String
Get
Return mMyClass.Name
End Get
Set
mMyClass.Name = Value
End Set
End Property

Public Sub SetAddress(ByVa l Address As String)
mMyClass.Addres s = Address
End Sub
End Class


The difference is, any class in the assembly can access MyClass1 and it's
properties/methods. But, everything outside the assembly can't access
MyClass1 directly.

Mythran

[Phill. W]

Re: friend class


"Boni" <oilia@nospam > wrote in message
news:erEIdDkYFH A.2128@TK2MSFTN GP15.phx.gbl...[color=blue]
> I would like to have an access from one class to the private
> variables of other.[/color]

You can't. If you need to be access a variable outside of a given
class, it has to be exposed, probably via a property.

Looking at your code, I would tend towards adding a Friend
method called something like "Prime", which class *in the same
assembly* can use to pass in a value, as in

Class A
Private K as Integer = Integer.MinValu e

Friend Sub Prime( ByVal Value As Integer )
' Prevent Prime being called more than once
If K <> Integer.MinValu e Then
Throw New ApplicationExce ption()
End If

K = Value
End Sub

End Class

Class B
Private oA As New A

Sub New()
oA.Prime( 10 )
End Sub

End Class

HTH,
Phill W.