On 5 January 2012 03:06, Walter Bright <newshound2@digitalmars.com> wrote:

On 1/4/2012 4:30 PM, Sean Kelly wrote:

If a library is written without consideration to what is virtual and what is
not, its performance will be the least of your problems.

I agree. Such is a massive failure in designing a polymorphic type, and the language can't help with that.

I don't follow.. how is someone failing (or forgetting) to type 'final' a "massive design failure"? It's not a design failure, it's not even 'wrong'... it's INEVITABLE.

And the language CAN help with that, by making expensive operations require explicit declaration.

At least make a compiler flag so I can disable virtual-by-default for my project...?