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- Subject: Re: Compiler Optimizations
- From: Javier Guerra Giraldez <javier@...>
- Date: Fri, 31 Aug 2007 20:28:44 -0500
On Friday 31 August 2007, Chris Swetenham wrote:
> I've thought about this a few times - are there any common or useful use
> cases of metatables where the assumption that metatable functions are
> idempotent (that is, the program state is the same after calling the
> function once as it is after calling it twice), AND that they only modify
> the table they are associated with, would lead to incorrect semantics?
> An obvious and trivial example is a metatable that counts accesses to a
> table, but this would usually be used for debugging/profiling rather than
> in production; I've not been able to think of any other examples.
any kind of proxy table.
the table associated with the functions isn't (usually) modified, but the
underlying (hidden) table is.
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