Due to these extra steps virtual functions come at an extra cost, both in size and in speed.
"Extra," but relative to what alternative? The typical alternative of storing a "type" data member and switching on that value is generally worse (since the switch has to be done in many places). It's a bit of a disservice to state that virtual functions come at an extra cost without also mentioning that the alternatives also have a cost. There's no free lunch.
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"Extra," but relative to what alternative? The typical alternative of storing a "type" data member and
switching on that value is generally worse (since theswitchhas to be done in many places). It's a bit of a disservice to state that virtual functions come at an extra cost without also mentioning that the alternatives also have a cost. There's no free lunch.