[Issue 1323] Implement opIn_r for arrays

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=1323





------- Comment #8 from wbaxter at gmail.com  2007-07-09 16:39 -------
(In reply to comment #7)
> as to in returning null, that is what 'in' does with AA's; if the key is in the
> AA return a pointer to the value, otherwise, return null.
> 
> In fact, the code I wrote works the same as 'in' for AA's
> 
> The usual way to use the return from 'in' where it might give null is this:
> 
> if(auto v = i in j)
> {
>   use(*v);
> }
> else
> {
>   // i not in j
> }

Sure, but my point was that it doesn't gain you any efficiency or clarity in
the case of arrays.  You might as well do:

if(0<=i && i<j.length)
{
  use(j[i]);
}
else
{
  // i not in j
}

It's only a few characters longer and clearer in my opinion.


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