safer casts - take II

[BCS]

Reply to terranium,

> BCS Wrote:
> 
>> you will need to demonstrate a better way. So far no one has.
>> 
> Your argument is big need for if(auto y=cast(Y)x) ?
> http://www.digitalmars.com/webnews/newsgroups.php?art_group=digitalmar
> s.D&article_id=71729
> 

Yes, I see a bigger need for that than for the throwing kind.

I guess if you can convince me that I am in the minority here you might have 
something, but just saying you never use them won't do it.