Option!T

[Max Klyga]

On 2013-12-10 18:35:37 +0000, bearophile said:

> Andrei Alexandrescu:
> 
>> Should we follow Scala's example and add it?
> 
> Making an Option a D Range means it becomes a Mondad :-) There's then a 
> need for more awareness of Option!T in map/filter/zip.
> 
> Related:
> https://d.puremagic.com/issues/show_bug.cgi?id=9086
> 
> Bye,
> bearophile

Actually for Option there is no need for special casing as it acts as 
an input range of one or zero elements, so all map/filter/etc. will 
just work