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ref object

Path: /sdk/add_on/scripthandle/

The `ref` type is a generic container that can hold any handle. It is a value type, but behaves very much like an object handle.

The type is registered with `RegisterScriptHandle(asIScriptEngine*)`.

See also
  Registering a generic handle type

# Public C++ interface

class CScriptHandle
{
public:
// Constructors
CScriptHandle();
CScriptHandle(const CScriptHandle &other);
CScriptHandle(void *ref, int typeId);
~CScriptHandle();
// Copy the stored reference from another handle object
CScriptHandle &operator=(const CScriptHandle &other);
// Set the reference
void Set(void *ref, asITypeInfo *type);
// Compare equalness
bool operator==(const CScriptHandle &o) const;
bool operator!=(const CScriptHandle &o) const;
bool opEquals(void *ref, int typeId) const;
// Dynamic cast to desired handle type
void Cast(void **outRef, int typeId);
// Returns the type of the reference held
asITypeInfo *GetType() const;
int GetTypeId() const;
// Returns the reference
void *GetRef();
};
asITypeInfo
The interface for describing types This interface is used to describe the types in the script engine.
Definition: angelscript.h:3704

# Public script interface

See also
  ref in the script language

# Example usage from C++

Even though the CScriptHandle is a value type, when registering properties of its type they should be registered as handles. The same goes for function arguments and return types.

CScriptHandle g_handle;
void Function(CScriptHandle handle)
{
... use the methods of CScriptHandle to determine the true object held in it
}
void Register(asIScriptEngine *engine)
{
int r;
r = engine->RegisterGlobalProperty("ref @g_handle", &g_handle); assert( r >= 0 );
r = engine->RegisterGlobalFunction("void Function(ref @)", asFUNCTION(Function), asCALL_CDECL); assert( r >= 0 );
}
asCALL_CDECL
@ asCALL_CDECL
A cdecl function.
Definition: angelscript.h:230
asFUNCTION
#define asFUNCTION(f)
Returns an asSFuncPtr representing the function specified by the name.
Definition: angelscript.h:685
asIScriptEngine
The engine interface.
Definition: angelscript.h:1102
asIScriptEngine::RegisterGlobalFunction
virtual int RegisterGlobalFunction(const char *declaration, const asSFuncPtr &funcPointer, asDWORD callConv, void *auxiliary=0)=0
Registers a global function.
asIScriptEngine::RegisterGlobalProperty
virtual int RegisterGlobalProperty(const char *declaration, void *pointer)=0
Registers a global property.

To set an object pointer in the handle from the application, you'll use the Set() method passing a pointer to the object and the type of the object.

To retrieve an object pointer from the application you'll use the Cast() method passing in a pointer to the pointer and the wanted type id. If the type id given doesn't match the stored handle the returned pointer will be null.

To retrieve an object of an unknown type use the GetType() or GetTypeId() to determine the type stored in the handle, then use the Cast() method.