arrays: if(null == [ ])

[Steven Schveighoffer]

On Tue, 15 May 2012 04:42:10 -0400, deadalnix <deadalnix at gmail.com> wrote:

> Le 14/05/2012 21:53, Steven Schveighoffer a écrit :
>> On Mon, 14 May 2012 15:30:25 -0400, deadalnix <deadalnix at gmail.com>  
>> wrote:
>>
>>> Le 14/05/2012 16:37, Steven Schveighoffer a écrit :
>>>> Note that [] is a request to the runtime to build an empty array. The
>>>> runtime detects this, and rather than consuming a heap allocation to
>>>> build nothing, it simply returns a null-pointed array. This is 100%  
>>>> the
>>>> right decision, and I don't think anyone would ever convince me (or
>>>> Andrei or Walter) otherwise.
>>>>
>>>
>>> Obviously this is the right thing to do !
>>>
>>> The question is why an array of length 0 isn't nulled ? It lead to
>>> confusing semantic here, and can keep alive memory that can't be
>>> accessed.
>>
>> int[] arr;
>> arr.reserve(10000);
>> assert(arr.length == 0);
>>
>> -Steve
>
> The length isn't set to 0 here. You obviously don't want that to be  
> nulled.

The assert disagrees with you :)

-Steve