| Synopsis: | Every header file shall use #ifndef .. #endif to prevent its body being #included multiple times. |
| Language: | C |
| Severity Level: | 2 |
| Category: | NON-LANGUAGE ISSUES |
| Description: |
| Since a header file may be used by source files and other header files, there is no way of knowing what order header files will be #included, nor how many times any particular header will be #included.
Example: /* include file header comment */ #ifndef included_HEADER_H #define included_HEADER_H /* * body of header file */ #endif |