Can't convert function pointer argument

Question

The error I'm getting:

error C2664: 'v8::FunctionTemplate::New' : cannot convert parameter 1 from 'v8::Handle<T> (__cdecl *)(const v8::Arguments &)' to 'v8::InvocationCallback'

Relevant definitions:

typedef Handle<Value> (*InvocationCallback)(const Arguments& args);




template<class C> class V8ScriptClass
{
public:
    template<class C, typename Rtype, typename Ptype1, Rtype (C::*FuncPtr)(Ptype1)> 
    void RegisterFunc(const char* const scriptname)
    {
     objtemplate->Set(
      v8::String::New(scriptname), 
      v8::FunctionTemplate::New(
      V8ScriptClass<C>::RelayCallback<C, Rtype, Ptype1, FuncPtr>
       ));
    };

template<typename Rtype, typename Ptype1, Rtype (*FuncPtr)(Ptype1 param1)>
static v8::Handle<v8::Value> RelayCallback(const v8::Arguments& args)
{
 std::cerr<<__FUNCTION__<<std::endl;
 v8::HandleScope handle_scope;
 return handle_scope.Close(toJSType( ((FuncPtr)(toCType(args[0]))) ));
};

Looks to me like the typedef and the actual function signature are identical.

edit: forgot one declaration:

class EXPORT FunctionTemplate : public Template {
 public:
  /** Creates a function template.*/
  static Local<FunctionTemplate> New(
      InvocationCallback callback = 0,
      Handle<Value> data = Handle<Value>(),
      Handle<Signature> signature = Handle<Signature>());

Answer 1

I found the error. the RelayCallback template takes a static function pointer as argument, and I tried to instantiate it with a member function pointer. I just had to change it to a member function pointer template argument.