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2010-01-29T07:53:32.917
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what exactly are you trying to do? it looks like you are trying to write a function that does something given two objects, and you want it to do a different thing based on the type of the combination of objects? remember that even normal polymorphism does "checks" internally. this is an interesting problem tho, polymorphism gives you the ability to easily overload the functionality of a function based on the type of ONE object, not two. what is it EXACTLY that you are trying to do? my best suggestion would be to make it so that each object could perform its own specific stuff separately and then return a common object for common processing: <pre><code>class Base { virtual SomeComonInterfaceObject DoMySpecialSomething() = 0; } void _doSomething(SomeComonInterfaceObject a, SomeComonInterfaceObject b); void doSomething(Base& o1, Base& o2) { _doSomething(o1->DoMySpecialSomething(), o2->DoMySpecialSomething()); } </code></pre> if that doesn't suit, you probably just have to check the type and do specifics based on that. note that even normal polymorphism does "checks" if you are worried about performance, any other language would have to too. the only way you might be able to get around that is by using templates, and it would probably get real ugly. would be interesting to know what you are trying to do. also, these doSomething functions, is it always the case that their two parameters are the same type? or do they mix and match?
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1. POc++ problem with function overloading
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1. USmatt
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1. COThats for that, but as you said that doesnt suit me :( No the parameters are not always the same type, they may mix and match as you said. What im trying to do is to make some specific operations only on some combinations of derived classes and "catch" it somehow in the most general function (with &Base, &Base) and do some error handling.
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