[:] as empty associative array literal, plus warning for null

[Regan Heath]

On Thu, 04 Jul 2013 15:45:54 +0100, TommiT <tommitissari at hotmail.com>  
wrote:

> On Thursday, 4 July 2013 at 13:32:25 UTC, Steven Schveighoffer wrote:
>> On Thu, 04 Jul 2013 08:52:12 -0400, Regan Heath wrote:
>>> Indeed.  IMO if(arr) should mean if(arr.ptr) .. and I thought it did..  
>>> or did this change at some point?
>>
>> No, it should mean if(arr.length).  It means if(arr.ptr) now, and this  
>> is incorrect.  [..]
>
> The meaning of if(x) for all x of nullable types has always been if(x !=  
> null) probably in all languages.

In fact, you can generalise further.

The meaning of if(x) is "compare the value of x with 0" (in C, C++, .. ).

The value of x for a pointer is the address to which it points.
The value of x for a class reference is the address of the class to which  
it refers.

If D's arrays are reference types, then IMO they should exhibit the same  
behaviour.

R

-- 
Using Opera's revolutionary email client: http://www.opera.com/mail/