nco: ncdf4a13/libsrc/fbits.h Source File

00001 /*
00002  *   Copyright 1995, University Corporation for Atmospheric Research
00003  *   See top level COPYRIGHT file for copying and redistribution conditions.
00004  */
00005 /* $Id: fbits.h,v 1.2 1995/05/26 20:46:46 davis Exp $ */
00006 
00007 #ifndef _FBITS_H_
00008 #define _FBITS_H_
00009 
00010 /*
00011  * Macros for dealing with flag bits.
00012  */
00013 #define fSet(t, f)       ((t) |= (f))
00014 #define fClr(t, f)       ((t) &= ~(f))
00015 #define fIsSet(t, f)     ((t) & (f))
00016 #define fMask(t, f)     ((t) & ~(f))
00017 
00018 /*
00019  * Propositions
00020  */
00021 /* a implies b */
00022 #define pIf(a,b) (!(a) || (b))
00023 /* a if and only if b, use == when it makes sense */
00024 #define pIff(a,b) (((a) && (b)) || (!(a) && !(b)))
00025 
00026 #endif /*!FBITS_H_*/