2013/9/10 Allen Wirfs-Brock <[email protected]> > On Sep 10, 2013, at 10:48 AM, Till Schneidereit wrote: > > Wasn't a major point in favor of having an [[Invoke]] trap that it > wouldn't require returning a function from the trap at all? We'd lose this > quality with both of these proposals. > > No, the major motivation was to provide a way to deal with different > styles of |this| mapping that are needed for different styles of proxies. > However, the ability to implement a method code without producing a > function is a desirable secondary benefit >
That's not how I would characterize it. Till's argument is the argument we had identified in favor of an invoke() trap almost from day 1 of the Proxy proposal. It was offset by the desire to keep the invoke = get+call invariant and to avoid non-extractable callable properties. Much later, we figured invoke() was needed to allow proxy handlers to cheaply rebind |this| when intercepting method calls. This tipped the balance in favor of adding invoke(). But the idea of avoiding the creation of a temporary function object is to me at least as important. Cheers, Tom
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