Why double not? (!!)

[Ryan via Digitalmars-d-learn]

>>>> It's a more concise way of writing:
>>>>     GetConsoleCP() != 0
>>>>
>>>> You can do this in C/C++ as well (and presumably some other 
>>>> languages).
>>>
>>>  Hmmm... thinking about it, it does make perfect sense. The 
>>> first ! converts it to bool, the other inverts it back to 
>>> it's positive/negative state.

Wouldn't this just be the same as
auto hasConsole = cast(bool) GetConsoleCP(); ?

I think the GetConsoleCP() != 0 code is the clearest about your 
intentions.