change 'this' pointer for structs to reference type

[Moritz Warning]

On Mon, 03 Nov 2008 00:17:47 +0300, Denis Koroskin wrote:

> On Sun, 02 Nov 2008 23:03:26 +0300, Simen Kjaeraas
> <simen.kjaras at gmail.com> wrote:
> 
>> On Sun, 02 Nov 2008 20:26:23 +0100, Moritz Warning
>> <moritzwarning at web.de> wrote:
>>
>>> On Sun, 02 Nov 2008 00:01:24 -0700, Walter Bright wrote:
>>>
>>>> Andrei suggested this change, and I think it is a great idea. D ought
>>>> to
>>>> be moving away from pointers for routine work, and this would make a
>>>> lot
>>>> of sense.
>>>>
>>>> It would entail some changes to user code, mostly when dealing with
>>>> the opCmp and opEquals member functions. The function signatures for
>>>> them would be changed to opCmp(ref const S).
>>>
>>> It's not clear to me what the effect would be on the usage.
>>>
>>> struct Foo
>>> {
>>>    int OpIndex(size_t){}
>>> }
>>>
[..]
>>
>>
> I'm not sure about this:
> 
> auto foo1 = new Foo();
> auto i1 = foo1[42];  // what is typeof(i1)?
> 
> auto foo2 = new Foo[100];
> auto i2 = foo2[42];  // what is typeof(i2)?
> 
> I expect to see Foo in both cases.

typeof(il) have to be int since opIndex returns int.