Avoid default constructor for member variable

Question

I have a class with a member variable of another class:

class MeasurementUnit {
private:
    MeasurementMultiplier _multiplier;

Actually I woul

Answer 1

Use MIL - Member Initialization List MIL

Answer 2

In all constructors of your class MeasurementUnit, you need to initialize the member variable _multiplier in the initializer list. Example:

MeasurementUnit::MeasurementUnit()
  : _multiplier(1,2,3)
{}