Author: Matt Taylor
Date: 19:23:28 12/25/02
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On December 25, 2002 at 15:56:19, Dave Gomboc wrote: >On December 25, 2002 at 15:38:19, Matt Taylor wrote: > >>>Overloading costs nothing, it's a compile time construct and is resolved at >>>compile/link time. >>>Inheritance costs nothing, it too is a compile/link time issue. >>>You know nothing about C++, do you? I didn't think so. >> >>Overloading costs an indirect function call. I'm not sure if you can apply const >>to a class like you can apply final to one in Java, but unless the compiler >>knows the class can't be inherited from, it has to make the operator an indirect >>function call. > >Calling a class const in C++ means something else, but a C++ compiler can (and >some do) figure out which classes are at the bottom of the inheritance hierarchy >at compile-time. (Unlike with Java, this isn't mutable at run-time.) > >Dave Ah, sorry, I was somehow thinking of Java where everything can be overloaded unless you say otherwise. Still, polymorphism still does not come for free. Another thing which C++ cannot do involves elimination of branches. If you have a switch/case with a few cases and a small number of computations, the best thing to do is compute them all and conditionally select the result (does not require branching). -Matt
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