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Soeren Muehlbauer
Guest
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 Posted: Wed Dec 22, 2004 12:03 pm Post subject: Interface inheritance |
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Hi,
i have some problems with interface inheritance.
I1 = interface
['{213DCE3C-D409-4B9A-9522-725202010A31}']
procedure A;
end;
I2 = interface(I1)
['{78AC955D-5C2B-4683-A000-D6C5AED57F56}']
procedure B;
end;
TTest = class(TInterfacedObject, I1, I2)
private
F1: I1;
public
procedure B;
property Intf1: I1 read F1 implements I1;
end;
The code won't compile, because the compiler thinks procedure A needs to
be declared. Why?
Thanks, Soeren
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Franz-Leo Chomse
Guest
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| Posted: Wed Dec 22, 2004 12:22 pm Post subject: Re: Interface inheritance |
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| Quote: | The code won't compile, because the compiler thinks procedure A needs to
be declared. Why?
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It looks for procedure A which is part of Interface I2. Only a
normally defined interface member can be shared between interfaces.
Regards from Germany
Franz-Leo
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Joanna Carter (TeamB)
Guest
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| Posted: Wed Dec 22, 2004 12:31 pm Post subject: Re: Interface inheritance |
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"Soeren Muehlbauer" <soeren.dd (AT) gmx (DOT) de> a écrit dans le message de news:
41c962cd$1 (AT) newsgroups (DOT) borland.com...
| Quote: | i have some problems with interface inheritance.
I1 = interface
['{213DCE3C-D409-4B9A-9522-725202010A31}']
procedure A;
end;
I2 = interface(I1)
['{78AC955D-5C2B-4683-A000-D6C5AED57F56}']
procedure B;
end;
TTest = class(TInterfacedObject, I1, I2)
private
F1: I1;
public
procedure B;
property Intf1: I1 read F1 implements I1;
end;
The code won't compile, because the compiler thinks procedure A needs to
be declared. Why?
|
Because you are trying to split an interface into its constituent parts. I2
is regarded as one interface and has to be completely implemented, either by
the class or by a delegate.
Do you really need to inherit I1 ? removing the inheritance achieves what
you are trying to do.
Joanna
--
Joanna Carter (TeamB)
Consultant Software Engineer
TeamBUG support for UK-BUG
TeamMM support for ModelMaker
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