Sandman: New page: category:precompiler == Definition == '''#ifndef''' : ['''#else :] '''#endif''' Checks if ''what to check'' was previously defined in the code. ...

Sandman — Sun, 30 Dec 2007 13:55:35 GMT

New page: category:precompiler == Definition == '''#ifndef''' <what to check> :<if block> ['''#else :<else block>] '''#endif''' Checks if ''what to check'' was previously defined in the code. ...

New page

[[category:precompiler]]

== Definition ==
'''#ifndef''' <what to check>
:<if block>
['''#else
:<else block>]
'''#endif'''

Checks if ''what to check'' was previously defined in the code. If it isn't, the code in ''if block'' will be compiled. If it is, the code in ''else block'' will be compiled or when there is no ''else block'', the compiler will continue after [[precompiler_endif|#endif]].

It is the opposite of [[precompiler_ifdef|#ifdef]].

{{Precompiler_statements}}

Precompiler ifndef - Revision history

Sandman: New page: category:precompiler == Definition == '''#ifndef''' : ['''#else :] '''#endif''' Checks if ''what to check'' was previously defined in the code. ...