Multi Inherence

[Bernard Bourée]

Is there a way to overpass the impossibility of VN.NET to accept the multi
heritage, that is to allow a class to inherit from TWO mother classes ?

--
Bernard Bourée
be*****@bouree. net

[Herfried K. Wagner [MVP]]

"Bernard Bourée" <be*****@bouree .net> schrieb:

Is there a way to overpass the impossibility of VN.NET to accept the multi
heritage, that is to allow a class to inherit from TWO mother classes ?

Not directly, but you can go the delegation way that was used in VB6 to
archieve implementation inheritance.

--
Herfried K. Wagner [MVP]
<URL:http://dotnet.mvps.org/>

[Marina]

No.

You will have to achieve what you want with inheriting from 1 and using
interfaces. Or having your class contain an instance of another as a
private member, and forwarding method calls to that object (if that can work
for your situation).

"Bernard Bourée" <be*****@bouree .net> wrote in message
news:eF******** *****@TK2MSFTNG P11.phx.gbl...

Is there a way to overpass the impossibility of VN.NET to accept the multi
heritage, that is to allow a class to inherit from TWO mother classes ?

--
Bernard Bourée
be*****@bouree. net

[Mike Labosh]

>> Is there a way to overpass the impossibility of VN.NET to accept the

multi
heritage, that is to allow a class to inherit from TWO mother classes ?

Not directly, but you can go the delegation way that was used in VB6 to
archieve implementation inheritance.

Here's a bizarre idea from left field... C++ can do multiple inheritance.
Could he do it via C++ / Managed Extensions and then use it from VB?
--
Peace & happy computing,

Mike Labosh, MCSD
"I have no choice but to believe in free will."

[JD]

C++ can do multiple inheritance, Managed C++ cannot.
"Mike Labosh" <ml*****@hotmai l.com> wrote in message
news:%2******** ********@TK2MSF TNGP15.phx.gbl. ..

Is there a way to overpass the impossibility of VN.NET to accept the
multi
heritage, that is to allow a class to inherit from TWO mother classes ?

Not directly, but you can go the delegation way that was used in VB6 to
archieve implementation inheritance.

Here's a bizarre idea from left field... C++ can do multiple inheritance.
Could he do it via C++ / Managed Extensions and then use it from VB?
--
Peace & happy computing,

Mike Labosh, MCSD
"I have no choice but to believe in free will."

[Bernard Bourée]

Herfried

Can you tell me more about delegation or some links ?

Thanks
--
Bernard Bourée
be*****@bouree. net
"Herfried K. Wagner [MVP]" <hi************ ***@gmx.at> a écrit dans le
message de news:eO******** ******@TK2MSFTN GP09.phx.gbl...

"Bernard Bourée" <be*****@bouree .net> schrieb:

Is there a way to overpass the impossibility of VN.NET to accept the multi heritage, that is to allow a class to inherit from TWO mother classes ?

Not directly, but you can go the delegation way that was used in VB6 to
archieve implementation inheritance.

--
Herfried K. Wagner [MVP]
<URL:http://dotnet.mvps.org/>

[Bernard Bourée]

Marina

Do you know where I can find an example?

Thanks

--
Bernard Bourée
be*****@bouree. net
"Marina" <so*****@nospam .com> a écrit dans le message de
news:O9******** ******@TK2MSFTN GP10.phx.gbl...

No.

You will have to achieve what you want with inheriting from 1 and using
interfaces. Or having your class contain an instance of another as a
private member, and forwarding method calls to that object (if that can work for your situation).

"Bernard Bourée" <be*****@bouree .net> wrote in message
news:eF******** *****@TK2MSFTNG P11.phx.gbl...

Is there a way to overpass the impossibility of VN.NET to accept the multi heritage, that is to allow a class to inherit from TWO mother classes ?

--
Bernard Bourée
be*****@bouree. net

[Larry Serflaten]

"Bernard Bourée" <be*****@bouree .net> wrote

Is there a way to overpass the impossibility of VN.NET to accept the multi
heritage, that is to allow a class to inherit from TWO mother classes ?

If there was a often used need for multiple inheritance, then MS would have
probably found a way to include it. Evidently they decided there wasn't
an absolute need that would be common enough for the functionality.

Perhaps if you describe what you want to do, someone can explain how
to do that within the confines of the language you are using....

LFS

[Mike McIntyre]

Bernard,
While Microsoft's .NET programming languages do not provide
multiple-inheritence they do provide ways to implement multiple-inheritance
like behavior.

There are other .NET programming languages that do support
multiple-inheritance:

Haskell.NET (HUGS98) is Haskell as a .NET programming language that allows
multiple-inheritance.

Eifel for .NET is another .NET programming language that allows
multiple-inhieritance:

http://msdn.microsoft.com/library/de...pdc_eiffel.asp
--
Mike

Mike McIntyre
Visual Basic MVP
www.getdotnetcode.com
"Bernard Bourée" <be*****@bouree .net> wrote in message
news:eF******** *****@TK2MSFTNG P11.phx.gbl...

Is there a way to overpass the impossibility of VN.NET to accept the multi
heritage, that is to allow a class to inherit from TWO mother classes ?

--
Bernard Bourée
be*****@bouree. net

[Herfried K. Wagner [MVP]]

"Bernard Bourée" <be*****@bouree .net> schrieb:

Can you tell me more about delegation or some links ?

Sample (untested):

\\\
Public Interface IB
Sub Goo()
End Interface

Public Interface IC
Sub Foo()
End Interface

Public Class A
Implements IB, IC

Private m_IB As IB
Private m_IC As IC

Public Sub New(ByVal IBImpl As IB, ByVal ICImpl As IC)
m_IB = IBImpl
m_IC = ICImpl
End Sub

Public Sub Goo() Implements IB.Goo
m_IB.Goo()
End Sub

Public Sub Foo() Implements IC.Foo
m_IC.Foo()
End Sub
End Class

Public Class B
Implements IB

...
End Class

Public Class C
Implements IC

...
End Class
..
..
..
Dim f As New A(New B(), New C())
///

--
Herfried K. Wagner [MVP]
<URL:http://dotnet.mvps.org/>