2013/9/11 David Bruant <bruan...@gmail.com>
> Le 11/09/2013 06:10, Boris Zbarsky a écrit :
>
> Hey all,
>>
>> I was looking at implementing a membrane using ES6 proxies and ran into a
>> snag. Consider a situation where object A has prototype B. A' is a proxy
>> implementing the membrane, whose target is A.
>>
>> But now if Object.getPrototypeOf(A') is invoked the return value will be
>> B (unless it just throws). There's no way for A' to return a new proxy B'
>> whose target is B in this situation.
>>
> In essence yes. In practice, you can do:
> // trap:
> getPrototypeOf: function(target){
> target.__proto__ = B';
> return B';
> }
> But of course, it changes A [[Prototype]], which is probably not
> desirable. And of course, although to-be-standard, __proto__ is bad taste...
>
Indeed, this is also the pattern I used, except it doesn't set the
`__proto__` of the real target, but of a shadow target: <
https://github.com/tvcutsem/harmony-reflect/blob/master/examples/membrane.js#L246
>.
Setting `__proto__` may be bad taste in general, but this is a case where
using this capability is necessary.
Ps: btw, wasn't "GetInheritance" supposed to be renamed "GetPrototype"?
>
I think we had agreement on that. Allen?
Cheers,
Tom
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