Error binding C++ class member function as a method of an object with node-addon-api

[Daniel Boll]

I'm trying to bind a C++ class member function as a method of a JavaScript object using node-addon-api in a C++ addon for Node.js, but I'm encountering an error.

I have the following code:

class ObjectMakerClass {
private:
  int value = 0;

public:
  ObjectMakerClass() { value = 1; }
  ObjectMakerClass(int value) { this->value = value; }

  Napi::Value getValue(const Napi::CallbackInfo &info) {
    return Napi::Value::From(info.Env(), value);
  }

  static Napi::Value getObject(const Napi::CallbackInfo &info) {
    Napi::Env env = info.Env();

    // Create a new object with a property named "value" and a value of 1
    Napi::Object obj = Napi::Object::New(env);
    obj.Set("value", 1);
    // Add another property to be a function named "getValue" and bind it to the member function
    obj.Set("getValue", Napi::Function::New(env, &ObjectMakerClass::getValue));

    // Return the object
    return obj;
  }
};

Napi::Object object_maker(const Napi::CallbackInfo &info) {
  Napi::Env env = info.Env();

  // Get the value from the parameters
  if (info.Length() < 1) {
    auto objectMaker = new ObjectMakerClass();
    return objectMaker->getObject(info);
  }

  int value = info[0].As<Napi::Number>().Int32Value();
  auto objectMaker = new ObjectMakerClass(value);

  // Return the object
  return objectMaker->getObject(info);
}

Napi::Object Init(Napi::Env env, Napi::Object exports) {
  exports.Set(Napi::String::New(env, "objectMaker"), Napi::Function::New(env, object_maker));
  return exports;
}

NODE_API_MODULE(addon, Init)

The issue I'm facing is that when I try to bind the getValue member function as a method of the JavaScript object using the &ObjectMakerClass::getValue syntax, I'm getting the following error:

error: must use ‘.*’ or ‘->*’ to call pointer-to-member function in ‘cb (...)’, e.g. ‘(... ->* cb) (...)’

I've tried different approaches but couldn't resolve the error. Can anyone provide guidance on how to bind a C++ class member function as a method of a JavaScript object using node-addon-api? Any help would be greatly appreciated!

Best Regards,
Daniel Boll. 🎴