[phobos] sizediff_t

[Andrei Alexandrescu]

I was aware of the presence of ptrdiff_t in druntime. Part of my point 
is that the name is sometimes a misnomer in C (which led to the 
definition of ssize_t) and even more so in D, where entire programs can 
be written without ever using the notion of "pointer".

So my question boils down, I think, to: do we go with "ssize_t" or 
"sizediff_t"?


Andrei

On 1/10/11 10:27 PM, Walter Bright wrote:
> Yes we do, ptrdiff_t, defined in object.
>
> Andrei Alexandrescu wrote:
>> One question - we don't have a type for the difference of two size_t
>> objects. That would be int on m32 and long on m64. C has historically
>> used ptrdiff_t for that, but not all size differences are pointer
>> differences, so gnu has acknowledged that by defining ssize_t ("signed
>> size_t" I suppose).
>>
>> While being in a crunch making some 64-bit changes I defined the type
>> sizediff_t. I wonder if that's okay as a permanent solution.
>>
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