Why is no qualification necessary?

Question

OK, I\'ll just post the complete program even though it has extraneous stuff and the code in question is the dead code…

#include 
#include         


        

Answer 1

When you derive from the class you have specify

std::ifstream

to be able to find the class in the std namespace.

In the code itself you class derived from std::ifstream knows everything of ifstream.

Inheritance of ifstream:

ios_base -> ios -> istream -> ifstream