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What’s wrong with virtual methods called through an interface

Andy's Blog – Calling a virtual method through an interface always was a lot slower than calling a static method through an interface. But why is that? Sure, the virtual method call costs some time, but comparing it with the difference of a normal static and virtual method call shows that the timings diverge too much. i7-4790 3.6GHz10,000,000 calls to empty method Instance call Interface call Static method 12 ms 17 ms Virtual method 17 ms 164 ms Let’s assume we have this declaration: type  IMyInterface = interface    procedure Test(A, B: Integer);  end;  TTest = ...
Favorite? Off-Topic? Andreas Hausladen @ 2016-05-31 20:20


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