How is the usage of constructors an implementation of data-hiding?

Question

I know what constructors are used for, and kinda know what data hiding means.... found absolutely no link among the two (im a dimwit, sedd).... please help?

Answer 1

I'd have argued that ctors can be used as a form of RAII. Essentially we can initialise an internal (private) variable via a constructor, and that variable can now be made to be inaccessible outside of the class.

class Foo
{
public:
  Foo(int i)
    : m_i(i) {} //< only place we init variable

private:
  int m_i; //< we cannot access this var
};