Re: Calling a specific function

[Tim Conkling <Timothy_Conkling@...>]

on 7/10/02 8:36 PM, Thatcher Ulrich at tu@tulrich.com reportedly stated:

> On Jul 10, 2002 at 08:30 -0400, Tim Conkling wrote:
>> I plan on writing an event system for my game whereby different a lua script
>> attached to an object will register different handlers for events that are
>> to be handled by the object's script file.
>> 
>> For example, I might have an object of type MyObject, which could be
>> associated with a file (on disk) called MyObject.lua. When this object was
>> being created, I would read in MyObject.lua and call a specific function in
>> that source file such as "initialize()". This function might request that a
>> function "beep_loudly()" be called for the event "TOUCHED", and the function
>> "become_invisible()" be called for the event "TIMER_EXPIRED". All of this
>> function registration has to happen at runtime, of course. How do I handle
>> calling a specific registered Lua function (in a buffered file) in C, and
>> how would the function registration work in Lua?
> 
> One way to do it would be by having the file return a table.  So in
> MyObject.lua, you'd do this:
> 
> ---- MyObject.lua ----
> return {
>      initialize = function(obj)
> -- ... stuff ...
>      end
> 
>      TOUCHED = function(obj, args)
> -- ... stuff ...
>      end
>      
>      -- etc
> }
> ----
> 
> Have your C/C++ code associate the return value of the script with the
> object, then look in the table for the desired handler when an event
> happens.

Would this work if, for example, the TOUCHED function called another utility
function in the same file?
-- 
Tim Conkling
Vaporware Software
<http://members.mint.net/conkling>