Brendan Eich wrote: > On Dec 15, 2009, at 11:18 AM, David-Sarah Hopwood wrote: >> Brendan Eich wrote: >>> In ES specs and real implementations, internal methods and various >>> corresponding implementation hooks are called based on [[Class]] of the >>> directly referenced object, in contrast. [...] > Sorry, I wrote "called" where I meant "defined". > >> As for implementation, [[Class]] could be derived from some other type >> tag that gives sufficient information to do such lookup, but [[Class]] by >> itself is not sufficient. > > I'm not sure what you mean. Sure, [[Class]] in the spec is > string-valued, so it can't be a vtable pointer. But in implementations > that use C++, there is not only a class name-string associated with > every instance, but a suite of internal methods or hooks.
Exactly: [[Class]] is associated with each instance and so are the other internal methods/properties, but that doesn't imply that other properties are "defined based on" [[Class]]. -- David-Sarah Hopwood ⚥ http://davidsarah.livejournal.com
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