On 12/04/2014 08:00 PM, Katelyn Gadd wrote: > I do still use WeakMap in a few other places, for example to implement > Object.GetHashCode. This is a case where the transposed representation > is likely optimal - though in practice, I shouldn't need any sort of > container here, if only the hashing mechanisms clearly built into the > VM were exposed to user JS.
If I am understanding correctly, I don't think there is any such hashing mechanism in the Spidermonkey VM. We hash on an object's pointer address, which can change during a moving GC. (We update any hashtables that incorporate an object's numeric address into their hash key computations.) I'm a little curious what you're generating the hashcode from. Is this mimicking a value object? If the contents of the object change, would you want the hashcode to change? Or are the "hashcodes" just incrementing numerical object ids? (Sorry for the tangent to the current thread.) _______________________________________________ es-discuss mailing list [email protected] https://mail.mozilla.org/listinfo/es-discuss
