On Friday, 6 December 2013 at 23:30:45 UTC, Walter Bright wrote:
On 12/6/2013 3:06 PM, Maxim Fomin wrote:
and what about holes in immutable, pure and rest type system?
If there are bugs in the type system, then that optimization
breaks.
Bad news: there are many bugs in type system.
C doesn't have virtual functions.
Right, but you can (and people do) fake virtual functions with
tables of function pointers. No, C doesn't devirtualize those.
Neither does D.
By the way, does D devirtualize them?
It does for classes/methods marked 'final'
this is essentially telling nothing, because these functions are
not virtual. In your speaking, C 'devirtualizes' all direct
calling.
and also in cases where it can statically tell that a class
instance is the most derived type.
I haven't noticed that.
