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Doubt in Inheritance !

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Former Member

‎2008 Feb 27 12:28 PM

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563

Hi Experts,

i have doubt in inheritances .

why multiple inheritance is not possible in OOAbap ?

wat is the Reason ?

can any one Clarify my doubt ?

Cheers,

Rajesh .!

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matt
Active Contributor

‎2008 Feb 27 12:57 PM

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539

Multiple inheritance is not permitted in ABAP Objects, because the language designers considered that it would cause ambiguity and complexity they didn't want.

Use interfaces instead. See my recent post about interfaces for ideas.

matt

Hi Experts,

i have doubt in inheritances .

why multiple inheritance is not possible in OOAbap ?

wat is the Reason ?

can any one Clarify my doubt ?

Cheers,

Rajesh .!

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matt
Active Contributor

‎2008 Feb 27 12:57 PM

0 Likes
540

Multiple inheritance is not permitted in ABAP Objects, because the language designers considered that it would cause ambiguity and complexity they didn't want.

Use interfaces instead. See my recent post about interfaces for ideas.

matt

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former_member576008
Active Participant

‎2008 Feb 27 3:26 PM

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539

Problems:

mostly used as ’mixin’ = interface

polymorphism on all axes (substitutability is hard)

name conflicts (in distributed development!)

multiple base classes? (diamond inheritance)

combinatorial explosion for multiple classification

  • must be resolved by role pattern or the like

  • would be static, not dynamic

=> multiple inheritance doesn’t do it!