object.md

Object

To support a custom object T as function arguments and return value, inherit naah::Object and register it with naah::Registration::Object. Note that T should be default constructible and contains only public members.

struct MyObject : naah::Object {
  std::string str;
  std::optional<uint32_t> num;
};

MyObject MyObjectMethod(MyObject input) {
  return MyObject{
      {},
      input.str + " world",
      input.num.has_value() ? std::optional<uint32_t>(*input.num + 1)
                            : std::nullopt,
  };
}

NAAH_REGISTRATION {
  using reg = naah::Registration;

  reg::Object<MyObject>()
      .Member<&MyObject::num>("num")
      .Member<&MyObject::str>("str");
  reg::Function<MyObjectMethod>("myObjectMethod");
}

In JavaScript :

binding.myObjectMethod({ str: "hello" }); // { str: 'hello world' }
binding.myObjectMethod({ str: "hello", num: 42 }); // { str: 'hello world', num: 43 }
binding.myObjectMethod({}); // throws TypeError