reincluding header in implementation

Question

suppose I have a header foo.h like this:

#ifndef FOO_H
#define FOO_H
#include 
#include \"non_standard_class.h\"

std::string foo(         


        

Answer 1

I would say it is, because otherwise your foo.cpp is relying on a detail of foo.h that may change. Obviously this is more of a problem with other .h files that aren't under your control, but I still do it for consistency sake.