One of the things I want to do for my game is have my player class and other classes call a specific function say update(delta_time) from a script. There would be a different script for each different character that the player might be. This means I would have multiple scripts that share the same function names becuase my class in c++ would just want to call update(delta_time) from the script. Currently to get this working in each script i put the prefix of the character name infront so now the function names are essentially different. Then when an instance of the class is created i set a variable in it to the name of the class. Then to call the function I just add the prefix of the name to update so it calls the function based on the name of the character.

example

2 scripts
bob.nut

function bobupdate(time)
{
//do stuff here
}

---

carl.nut
function carlupdate(time)
{
//do stuff possibly different than bobs
}

Then in c++ the update function for the class looks like this

void Player::update()
{
//call a squire function
char update[64];
sprintf(update,"%supdate",name);

SquirrelObject root = SquirrelVM::GetRootTable(); // gets the global scope
SquirrelObject upd = root.GetValue(update); //fetches the function from the root

SquirrelVM::BeginCall(upd);
SquirrelVM::PushParam(1);
SquirrelObject retval = SquirrelVM::EndCall();

// do more stuff below

}

This works fine for what I want but seems like there should be something better?

-Matt

p.s. Also hopefully tomorrow I will post a small tutorial of some of the things I have been fidling with, just want to clean it up.

pps Also on the documentation at least the online one in the Create C function
sq_newclosure(v,f,0,0); //create a new function
sq_newclosure only takes 3 parameters not 4

It would appear you could do:



struct Player {

<span id="_ctl0_PostForm_Reply">  SquirrelObject upd; // Should be properly reference counted. Not clear what happens when reseting the function definition via script: new functionality? Error? Setting the table/slot entry to a non-function should also be possible, whereby a BeginCall() would then fail with an error.

...

</span>  void Player::init(void) {

<span id="_ctl0_PostForm_Reply">    char update[64];

    sprintf(update,"%supdate",name);

</span><span id="_ctl0_PostForm_Reply">    SquirrelObject root = SquirrelVM::GetRootTable(); // gets the global scope

    upd = root.GetValue(update); //fetches the function from the root </span>

<span id="_ctl0_PostForm_Reply">  } // init

</span><span id="_ctl0_PostForm_Reply">  void Player::update(void) { // Call a squirrel function: that's about as efficient as you can make it with a stack-based scripting language.

    SquirrelVM::BeginCall(upd);

    SquirrelVM::PushParam(1);

    SquirrelObject retval = SquirrelVM::EndCall();

     // do more stuff below

   }  // update

</span>};



You can reduce typing by wrapping common function call patterns with macros or using templates (can get complicated/may run slower if helpers are required. See LuaPlus implementation for more info (e.g. LPCD, LuaPlus Call Dispatcher)).



<span id="_ctl0_PostForm_Reply">John

</span>