I want to define a macro within another macro, in order to save me some repetetive writing.

Currently I have to write this:

MyClass : public Base<MyClass> {
  Value<std::string> testString = value<std::string>(&MyClass::testString, "something");
  // many more values like this
}

And I want to write something like this, in order to reduce the cluttery of the above:

BASE(MyClass) {
  VALUE(std::string, testString, "something");
}

My solution would have been to define two function style macros and BASE and VALUE and within BASE define another constant named __CURRENT_CLASS that will be used for all calls of VALUE. But how do I define this constant within the BASE macro?