Mark S. Miller wrote:
Only useful for instance-private instance variables, in which
case you may as well use lexically captured per-instance state.
No, "friend" is shared between two classes, no way to make a
closure per instance extending over both constructors. Pretend the
module above is an IIFE.
You're missing my point. My point is independent of whether there are
two classes or one in the scope of your friend declaration. For
simplicity let's say there's only class A.
|this| binding only helps when a method is applied to its bound this,
not to an argument.
* It does not enable an instance of A to recognize that another
instance of A is an A.
* It does not avoid the storage cost of objects-as-closures, since you
still need a function object per method per instance.
Sorry for being unclear -- my fault for not taking the time to develop
the example. An example would have to avoid closure pattern even coming
to mind, since I don't think it is relevant. The general problem is
making a non-colliding name that can be used in two disjoint scopes, on
objects of known provenance.
/be
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