Thread: benefits of private or protected constructor

Originally Posted by George2

I am thinking about the benefits of a private or protected constructor. The only benefits I could think of is we could use singleton design pattern and make a public function (e.g. CreateInstance) as a single point to create instances and hide the constructor to outside.

protected constructor prevents people from creating instances of a base class that is just an interface class and was never intended to be instantiated directly.
But yeah you pretty much get the usefulness of it already.