where to find info?

[Ips]

hello!
Where can I find a reference to the information that the define names
starting with unserscores are reserved for compilers?
I mean something like this:

#define __MYFILE__ "test.h"

or
#ifndef __MYFILE__
#define __MYFILE__

#endif

any help appreciated

regards;
Ips

[Rolf Magnus]

Ips wrote:

hello!
Where can I find a reference to the information that the define names
starting with unserscores are reserved for compilers?

In the C++ standard. And it's not just #define, but rather any
identifiers starting with an underscore followed by an uppercase letter
or containing two consecutive underscores.