Re: worst case time using hash-tables in Lua

[Andrea <andrea.l.vitali@...>]

The automatic garbage collection in Lua, Java, C# etc. does not require you to do any of that, but it has a lot more overhead and does not free memory instantly, which is why the "<close>" facility was added in Lua 5.4.0.

let me double check to be sure I understand correctly: could one use <close> on tables and exploit this to free tables as soon as possible without waiting for the garbage collector to kick in?

No, __newindex can be used to block adding new keys, but you can still delete keys or modify the associated value. You can make a proxy table that blocks all modifications. This creates some overhead, though, and 'rawset' etc. will still ignore the readonly status. 

Thank you - I should have been more precise: yes a proxy table can do that!

--

Andrea Vitali

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