Re: Interface without Inheritance
On 2/21/2013 11:50 AM, nicetan@gmail.com wrote:
Is it possible to force a c++ class to implement an interface without
inheriting from the abstract base class?
Hm... AFAIK, no. Inheriting from an ABC is the only way to _enforce_
implementation.
Sometimes it's possible to provide your own ways to implement interface
without inheritance, like using macros that inject declarations into the
class definition, but those are voluntary, from what I've seen. Perhaps
there is some preprocessor trickery that could be played in that
situation, but nothing immediately comes to mind.
> I just want to perform a
compile time check, make sure these methods are implemented, but not
have all the virtual methods, since I've heard that virtual methods
have some performance hit and can't be inlined.
Performance should not be approached based on a rumor. If you think
your implementation has performance impact, you need to *measure* it to
confirm.
I realize that the performance hit is negligible but why have a
performance hit at all when I'm not really inheriting anything, just
forcing a certain set of methods to be implemented?
You can use compile-time asserts (see "static asserts") to verify that
your class has specific methods of specific types, and that's probably
the other solution for you, but then again, if class hasn't been written
yet, it has no name, so how would you know to assert anything based on
that type's implementation?
V
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