Header question again

It means in your .h file you don't have to inlcude a header file for any pointers you use just forward declare them

ie for
class foo;

class bar
{
foo* m_foo;
}

then in your cpp add #include "foo.h". One reason to do this is to cut down on compile times. If foo.h is changed then the compiler needs to touch your bar.h file. If you forward declare the class then it only needs to touch your cpp file.

You can see how touching the .h file would increase compile times as the compiler would then need to recomiple every file that included your bar.h file.

Cheers
Chris

A forward declaration is really the same thing as a prototype, except with a struct or class (and perhaps a few other things) instead of a function.