| --- Log opened Fri Dec 25 00:00:38 2020 |
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| 08:40 | | * Vorntastic pokes at properties in lua |
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| 16:51 | <&ToxicFrog> | Properties as in fields with automatically invoked getters/setters? |
| 16:54 | <~Vornicus> | yeah. looks like you can do it with __index and __newindex but you now have to proxy the actual methods |
| 16:54 | <&ToxicFrog> | Yeah. |
| 16:55 | <&ToxicFrog> | metamethods are fallbacks rather than overrides, so for anything like this you need a proxy object with __index and __newindex that forward to the real object. |
| 16:56 | <~Vornicus> | I don't think I understand what you just said |
| 16:56 | <&ToxicFrog> | If you're interfacing with C (or are ok using the debug API) you can use a zero-size userdata as the proxy. |
| 16:56 | <&ToxicFrog> | Ok so |
| 16:56 | <&ToxicFrog> | If you have a table t, and you setmetatable(t, { __index = my_index_function, __newindex = my_newindex_function }) |
| 16:56 | <~Vornicus> | right |
| 16:57 | <&ToxicFrog> | t["foo"] will call my_index_function iff the key "foo" doesn't exist in t |
| 16:57 | <~Vornicus> | also right |
| 16:57 | <&ToxicFrog> | And t["foo"]="bar" will call my_newindex_function under the same conditions |
| 16:57 | <~Vornicus> | nothing surprising yet. |
| 16:57 | <&ToxicFrog> | So usually you do something like: local proxy = {}; local real = {...}; return setmetatable(proxy, make_metatable_for(real)) |
| 16:58 | <&ToxicFrog> | So the proxy stays empty permanently, so that __index and __newindex get called for every get/set on its fields |
| 16:58 | <&ToxicFrog> | And the metamethod handlers store data in `real` instead |
| 17:00 | <~Vornicus> | oh I see what you're up to now |
| 17:00 | <&ToxicFrog> | There are other ways you can do this (e.g. rather than a separate proxy and real object, mangle the field names, so obj.foo="bar" instead stores it in obj[".field.foo"] or something) |
| 17:01 | <&ToxicFrog> | But they all stem from the same restriction that if you want your getters and setters to fire you aren't allowed to use the key they fire on. |
| 17:01 | <~Vornicus> | In this particular case I'm looking into swizzles |
| 17:01 | <&ToxicFrog> | (or rather, aren't allowed to store stuff under that key for real, "use" is a bit vague) |
| 17:01 | <&ToxicFrog> | The vector composition technique? |
| 17:02 | <~Vornicus> | Yeah |
| 17:02 | <&ToxicFrog> | Good luck! |
| 17:04 | <~Vornicus> | and I'm pretty sure I'll be safe using "mangled" names - really it's a regular ordered table and then the swizzles return/expect another vec |
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| 23:30 | <&[R]> | https://github.com/sarfata/pi-blaster <-- neat |
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| --- Log closed Sat Dec 26 00:00:40 2020 |