JohnsonGPS, I'm not sure what he is talking about. The enums might get out of sync if the build system doesn't work perfectly (where some of the files that depend on the enum or the inline function aren't recompiled if the enum or the inline function change). That really is not a good reason for not using inline functions though.

Also, his next post about the order of the enumerations being wrong is questionable, so maybe he just doesn't understand how enums work.