DMD can implicitly convert class pointer to the bool. Is it bug or terrible feature?

[deadalnix]

On Sunday, 24 November 2013 at 14:24:09 UTC, ilya-stromberg wrote:
> On Sunday, 24 November 2013 at 14:17:50 UTC, Dicebot wrote:
>> Not exactly. It is all about "if" condition. AFAIK, D defines 
>> that condition `if(X)` get re-written to `if(cast(bool)X)` 
>> before semantic pass. So it is kind of implicit explicit 
>> conversion :)
>
> Not exactly.
>

Your say no, but you then confirm. Please reread Dicebot's post.

> Code:
>
> bool b = f;
>
> DMD output:
>
> Error: cannot implicitly convert expression (f) of type Foo to 
> bool
>
>
> But code:
>
> bool b = !f;
>
> compiles.