Can you make an overall include file?

can you make an overall include file that you can include all the include files?, like so:

OVERALL.h:

#ifndef MYGRAPHICSTUFF
#include "MyGraphicStuff.h"
#endif
#ifndef MYSTRINGFUNCS
#include "MyStringFuncs.h"
#endif
blah, blah....

and then you ONLY include the above file ONCE for each CPP file and if you need to add another *.h file to your project then you just add it to this overall include file instead of having to type it into ALL the CPP files.

is it OK to do this?

if this question doesn't make any sense then wait till tomorrow and I will have a good nights sleep backing my mind.

It will work, but it's a bad idea. Files should only include that which they directly depend on.

why is it a bad idea?

>why is it a bad idea?

It bloats files and slows them down.

Plus if you change one tiny headerfile in use, it will recompile your whole project, as each and every cpp-file has it included. Can be a PITA.