DIP23 draft: Fixing properties redux

[Gor Gyolchanyan]

I always wondered if there's a good way to incorporate opOpAssign family of
operators with the write property syntax.
Currently, using anything but the direct assignment fails, so even if
eventually the support for defining specific opOpAssign for properties
won't be implemented, at least the automatic rewrite of them would be nice:

struct A
{
public:
    int i()
    {
        return _i;
    }

    int i(int i_)
    {
        return _i = i_;
    }

private:
    int _i;
}

unittest
{
    A a;
    a.i += 2; // a.i(a.i() + 2);
}


On Sun, Feb 3, 2013 at 12:16 PM, Andrei Alexandrescu <
SeeWebsiteForEmail at erdani.org> wrote:

> Walter and I have had a discussion on how to finalize properties.
>
> http://wiki.dlang.org/DIP23
>
> We got input from DIP21 (which we didn't want to clobber, hence the new
> DIP) and the recent discussion.
>
> The proposal probably won't be accepted in its current form because it
> breaks some code. We hope to bring it to good shape with everyone's help.
>
> In brief:
>
> * Optional parens stay.
>
> * Just mentioning a function or method without parens does NOT
> automatically take its address. (This is a change from the current
> behavior.)
>
> * Read properties (using @property) work as expected with the mention that
> they may NOT be called with the parens. Any parens would apply to the
> returned value.
>
> * Write properties (using @property) may only be used in the assignment
> form (no function-style call allowed).
>
> It is understood that the current proposal is just a draft and there must
> be quite a few corner cases it doesn't discuss. We also understand it's
> impossible to reconcile all viewpoints and please all tastes. Our hope is
> to get to a point where the rules are self-consistent, meaningful, and
> complete.
>
>
> Destroy.
>
> Andrei
>



-- 
Bye,
Gor Gyolchanyan.
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