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- Subject: RE: Enumerating Inherited Properties
- From: RLake@...
- Date: Thu, 6 Mar 2003 18:15:08 -0500
Alex Bilyk escribió:
You can do this with generalized 'for' construct in Lua 5. All you have to
do is to write a function that generates 'next' pair the way *you* want it.
For instance, one could write a generator function that iterates through
every sub-entry within a given table hierarchy or only some designated
entries satisfying some criteria. In your case, the criteria would be to
pay attention to "__index" and include those into your iteration domain. No
new metamethods are needed for this.
Of course, that is true. However, that assumes that you always know the
iteration type of the table you are trying to iterate. A general pairs
function which consults the metatable to extra the __pairs metamethod is
not significantly slower than the existing pairs function, and avoids
iterators having to intimately know their subjects.