[luabind] re: Giving different scripts to objects of the same class...

[fries <lnm...@ho...>]

> now my problem is for different monsters...
> As my LUA script for the one monster example defines a lua function
> named monter_function, function that I will call from C++, at each
> tick of action, I now don't see how I could make two monsters have
> different scripts...
> And moreover, my purpose is to have n-monsters with n possibly
> different scripts.... So changing names of LUA defined functions won't
> work...

I came across this same problem, and found a relatively good solution for
it. *looks for his source code...*

What i did was in the class that i wanted to have different scripts, i
defined a member like this:

class Monster
{
    ...
    constructor and otehr stuff....
    ...

    luabind::object methods;
}

Now, i expose the class:

class_<Monster>("Monster")
    ...    other stuff ...
    .def_readwrite ( "methods", &Monster::methods )

Now, what this does, is it lets me use 'methods' as a table to store Lua
methods and variables. So in the script i do something like this (after
making the global 'this' in the script point to my instance of the mosnter
class in c++):

function this.methods.init(this)
    print("Initilising Monster");
end
function this.methods.update(this)
       %% insert monster specific update loop here
end

This i find is very flexable, and you can call these functions from c++ by
doing:
monster.methods["init"](monster);
monster.methods["update"](monster);

you have to pass the pointer to the monster because the init function takes
it as a paramater. You can also have additional paramaters like:
monster.methods["init"](monster, param1, param2, ...);
but your init function has to take paramaters ;)

I hope this helps. I have the source code to a simple 'robowars' type game
that i made,
where you script the AI for different robots using LUA, if you would like to
take a look or if you would like me to clarify anything, email me at
lnm...@ho.... The source code is pretty messy, but i think it would
be usefull to look at ;)