The call is rewriten to _aa_len(aa) and checks for null.
This can almost be done with a normal class, except the compiler inserts a
null check into each member function, iirc.
I guess that's another bit of magic that can't be handled simply.
It can still be done with a struct:
struct AAPimpl
{
AAImpl aa;
size_t length() @property
{
if (!aa) return 0;
return aa.length();
}
}
I expect something like this will end up being the solution.
"Ben Davis" <[email protected]> wrote in message
news:[email protected]...
> On 19/02/2012 15:05, Daniel Murphy wrote:
>> "Ben Davis"<[email protected]> wrote in message
>> news:[email protected]...
>>> On 19/02/2012 03:31, Daniel Murphy wrote:
>>>> Except for this magic initialization, AAs behave the same as classes -
>>>> ie
>>>> a
>>>> reference type.
>>>
>>> That's not quite true, because 'length' is passed around by value
>>> alongside the reference, leading to semantics you could never reproduce
>>> with classes, unless I'm mistaken.
>>
>> AAs, not Arrays.
>
> Ah, well then I did this test earlier:
>
> int[string] assoc=null;
> writefln("%s",assoc.length);
> //prints 0
>
> Why did that work?
