Squirrel

Hi! I'm new to Squirrel but it seems to be exactly the type of scripting language I'm looking for. At the moment I only initialize/close Squirrel in my game (very basic stuff). For my game objects I want to implement a class structure like it is in Unreal. I have a base class "CGameObject" in C++ which is also known in Squirrel script. Every game object should be defined in script as a subclass of CGameObject. I guess this works so far, but let's assume I have an array of CGameObjects in C++ and a class Enemy defined in Squirrel as subclass of CGameObject. How can I create an object/instance of that class in C++? There must be something like
CGameObject go = sq_createobject("Enemy");
btw: I'm using SqPlus.
Thanks in advance!

The SqPlus Wiki-site http://wiki.squirrel-lang.org/default.aspx/SquirrelWiki/SqPlus.html states that "C++ classes can inherit from Squirrel classes". If someone could give me a hint on how to do that I might be a step closer to what I want to accomplish.
Another possibility would be to create a vector/array of SquirrelObjects, although I'm not sure it would work the same way I want it to...

Hello,

Creating objects:

There are several ways, of course including running a script snippet that does it.

At C/C++ level, it would still need to happen through the stack. I understand that new instances are created by pushing the class object on the stack and calling meta method _opcall. Something like:

  HSQUIRRELVM v = /* from somehwre */
  sq_pushroottable( v );
  sq_pushstring( v, _SC("Player") )
  sq_get( v, 2 );  // Get the class
  sq_createinstance( v, 1 );

--------

Second question, extending a Squirrel class in C++:

Inheriting in C++ from Squirrel is easier than the other way around. Basically, in Squirrel:

  class MyClass {
    function MyFunc( ){ return "A return value" }
  }

Then using SqPlus, you can declare in C++ :

  class MyDerivedClass {
  public:
    const char* MyFuncOverride( ){ return "Override return value"; }
 }

and then bind the class using SqClassDef:

  SQClassDef<MyDerivedClass>( "MyDerivedClass", "MyClass" ).
    func( &MyDerivedClass::MyFuncOverride, "MyFunc" );

SqPlus then generates the Squirrel class that does the binding.


Regards
// ATS.

I used the past few days to wade through the forum... Currently I'm sticking with an array of SquirrelObjects, this seems to do the trick. First I create an instance with CreateConstructNativeClassInstance, then I attach a SquirrelObject to it with AttachToStackObject(-1). From there I just have to use GetValue to get a class-specific function and then call it for example.

@ats
This is very interesting, especially the C++ inheritance from Squirrel. Maybe this will be useful in the future. Thank you for your "enlightenment" ;)