[oolua] Re: Getting class info from instance in Lua
- From: Sean Dunn <seanedunn@xxxxxxxxx>
- To: "oolua@xxxxxxxxxxxxx" <oolua@xxxxxxxxxxxxx>
- Date: Sun, 2 Mar 2014 10:19:30 -0800 (PST)
Ok, looks like this works. I can send you the patch if you're interested. It's
pretty straightforward.
--
On Sunday, March 2, 2014 11:43 AM, Sean Dunn <seanedunn@xxxxxxxxx> wrote:
I didn't realize that the userdata wasn't just the pointer to the native
instance, but that it uses the Lua_ud type to contain the instance and
metadata. On further inspection it looks like my goal could be reached by
exposing a call that uses OOLUA::INTERNAL::check_index<T> (which calls
ud_is_type<T>()) through the proxy class's Lua table.
>
>
>I'm going to try it out soon, but does that seem like a good direction to go
>in, or are there deeper issues with doing this that I'm not aware of?
>
>
>--
>
>
>
>On Sunday, March 2, 2014 9:50 AM, Sean Dunn <seanedunn@xxxxxxxxx> wrote:
>
>I think we're on the same page. Since Lua isn't a strongly typed language,
>it's useful to know what you're sending to an OOLua proxy. It seems like a
>good design decision of yours not to use RTTI in Oolua, but I need a basic way
>to, from Lua, to do the following:
>>
>>local inst
>>-- some code, we don't know what inst is, but it's possibly from MyClass.new()
>>if MyClass.isInstance(inst) then
>> -- do something
>>end
>>
>>Do you have any ideas on how I could achieve this using OOLua, or is this
>>something I could only do by changing the library to store some intrusive
>>data as part of the instance (for example, via a mix-in)?
>>
>>
>>> On Mar 2, 2014, at 6:55 AM, "Liam Devine" <liamdevine@xxxxxxxxx> wrote:
>>>
>>>> On 02/03/14 05:17, Sean Dunn
wrote:
>>>> I'm trying to determine whether an instance is a member of a specific
>>>> proxy class, in Lua. I've looked through the documentation, and I don't
>>>> see any mention of what the API is on the Lua side, or whether this is
>>>> possible. Can someone point me to docs, or where in the source this is
>>>> specified?
>>>>
>>>> Thanks,
>>>> Sean
>>>>
>>>> --
>>> Sean,
>>>
>>> If I understand you correctly, the library does not store any
>>> information about members of a class.
>>>
>>> --
>>> Liam
>>>
>>
>>
>>
>
>
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