Support perfect forwarding of arguments

[VitaminCpp]

If you define custom factories which take their arguments by reference instead by value, v8pp::class_::create_object() doesn't play well.
As a workaround you have to create the object manually:

ConsoleWrapper my_class_wrapper(ctx.isolate());
  my_class_wrapper
  .set("debug", &ConsoleJs::debug)
  .set("info", &ConsoleJs::info)
  .set("warn", &ConsoleJs::warn)
  .set("error", &ConsoleJs::error)
  .set("log", &ConsoleJs::log)
  .set_json()
  ;
  ctx.set("console", ConsoleWrapper::import_external(ctx.isolate(), v8pp::factory<ConsoleJs, v8pp::raw_ptr_traits>::create(ctx.isolate(), logger())));

So it would be nice if v8pp would support Perfect Forwarding.
This would also eliminate the use of custom factories for reference arguments?

Thanks!

[VitaminCpp]

I think

v8pp/v8pp/factory.hpp

Line 25 in 688e9e1

static object_pointer_type create(v8::Isolate* isolate, Args... args)

also needs some attention? :)

[pmed]

There is a problem with the factory::create() arguments forwarding. There may be a factory specialization with non-template create() declared, so such a line in class_::factory_create::call() default create implementation for class_::ctor<>() :

return detail::call_from_v8<Traits>(&factory<T, Traits>::template create<Args&&...>, args);

would fail on such a specialized factory (see https://github.com/pmed/v8pp/blob/master/test/test_class.cpp#L95 for example).

I currently have no idea how to deal with this. Newer c++17 branch has this problem, since that branch has no more factory concept at all.

[VitaminCpp]

OK I see... Thanks anyway for your hard work! ;-) Maybe there is a solution for this, but currently I also have no clue...