[Issue 3655] Virtual functions without bodies are not optimized away.

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=3655


Walter Bright <bugzilla at digitalmars.com> changed:

           What    |Removed                     |Added
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             Status|NEW                         |RESOLVED
                 CC|                            |bugzilla at digitalmars.com
         Resolution|                            |INVALID


--- Comment #3 from Walter Bright <bugzilla at digitalmars.com> 2009-12-28 21:14:32 PST ---
The compiler is working as designed.

The final function is not virtual, so it is never needed in the vtbl[]. Hence,
there is no undefined reference to it in the vtbl[].

The non-final function is virtual, and so a reference to it is put into the
vtbl[]. The function's implementation must exist somewhere, and if it did, the
linker would put a reference to the implementation in the vtbl[]. This feature
allows one to have an implementation that is hidden from the user of the class.

If you truly do not want to implement the function, declare it as 'abstract'.
Then, a NULL is put in the corresponding place in the vtbl[].

Not a bug.

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