What's the best way to force the user of a C++ function to acknowledge the semantic meaning of parameters that are numerical constants?

Question

I\'d like to write function interfaces that force the user to acknowledge the semantic meaning of built-in constants. For example, I\'d like to take

void rotate(         


        

Answer 1

The key to this constraint is to declare your constructor explicit:

class Radians
{
public:
  explicit Radians(float value) : m_value(value) {}
private:
  float m_value;
};

That way your user can't type rotate(4.5). They'll have to type rotate(Radians(4.5)).