Why does IntelliSense show a constructor I didn't write?

Question

What does it mean by the suggestion give by the IDE? (using VS 2010)

There is no constructor of baseClass_2 which takes the suggested parameter(const baseClass_2 &). So, why this is showing up?

Answer 1

Implicitly defined copy constructor.

There are special member functions which get defined by default when you not explicitly declare / define them:

• Default constructor
• Copy constructor
• Destructor

Note that the default constructor will not get defined when you provide any other constructor besides the copy constructor.