My own iostream

Question

Is it possible to create a source&header file with classes to be of same level (equivalence,importance,manner...) as those iostream and string and cmath that we #include all the time? Is it possible to make those libraries used without .h ?

Answer 1

I guessed it is not a good idea. But still, is it possible for "home made" classes to become same level, to #include them in a same manner as the "core" libraries such as iostream etc.?