On 19.08.2017 9:27, Sven Barth via fpc-devel wrote:
The designers of Object Pascal decided on purpose against multiple
inheritance as they probably saw the problems that C++ has with them.
Even Java and C#, both clearly influenced by C++ don't support
multiple inheritance.
Just think about one class in the inheritance graph reintroducing a
virtual method with different parameters. What will the final class do
then?
Nothing special. The new virtual method is just a completely different
method. Nothing to really bother about. Pascal supports overloading with
no problems.
Actually what you get from the schema is a single inheritance chain. The
extension classes would be automatically inserted:
TBase = class(TObject);
TBase_TAddressExtension = class(TBase);
TBase_TAddressExtension_TTagsExtension = class(TBase_TAddressExtension);
TCustomer = class(TBase_TAddressExtension_TTagsExtension);
Ondrej
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