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On 11/07/16 11:38 PM, Sean Conner wrote:
It was thus said that the Great Soni L. once stated:After LuaConf 2016, more specifically the Lua stored procedures talk, I kept thinking about something... They had to modify the Lua VM just so they can decay userdata into keys when indexing, everything else could be done with a substitution layer on top of Lua. So, can we get a __key metamethod *for userdata only* that takes an userdatum and returns a value to be used for table indexing? For t[k] and t[k] = v this is pretty simple to understand, but Lua isn't that simple: - How should rawget() and rawset() work? - Should there be a way to invoke __index and __newindex without invoking __key? (rawkeyset() and rawkeyget()?) - Should there be a way to invoke __key without indexing? (getkey()?) (for use with rawset/rawget) - Or is this the wrong way to go about it?Previous discussions on __key: http://lua-users.org/cgi-bin/namazu.cgi?query=__key&idxname=lua-l&max=20&result=normal&sort=date%3Aearly
Interesting. Such a shame previous threads didn't go very far. However, the use-case I proposed is different, as it's about compatibility/interoperability with Lua types (number, string, boolean, etc).
And just because ... __hash: http://lua-users.org/cgi-bin/namazu.cgi?query=__hash&idxname=lua-l&max=20&result=normal&sort=date%3Aearly -spc (Wow ... that __hash one goes way back to 2003 I see ... )
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