#include header guard format?

Question

I know it makes little difference to a project but, assuming you use #defined header guards for your C++ code, what format do you use? e.g. assuming a header called f

Answer 1

I tend to use:

#ifndef FILE_DATE_H_

(replace _H_ with the appropriate extension like _HPP_, etc). The date stamp is to avoid collisions with other same named headers in other directions/libraries.

so in the end it looks like this:

#ifndef SOMEFILE_20082411_H_