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digitalmars.D.learn - Virtual functions and modules

Hello All ! 
From specs I've learnt that "since the D compiler knows all of the class 
hierarchy when generating code, all functions that are not overridden can be 
optimized to be non-virtual." 
Does it mean that all functions in a module are virtual becouse compiler can 
not know how one will use classes of that module, and will some other classes 
inherit them ? 
Mar 30 2005