include/macros.h

   1 /*
   2  *
   3  *                This source code is part of
   4  *
   5  *                 G   R   O   M   A   C   S
   6  *
   7  *          GROningen MAchine for Chemical Simulations
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   9  *                        VERSION 3.2.0
  10  * Written by David van der Spoel, Erik Lindahl, Berk Hess, and others.
  11  * Copyright (c) 1991-2000, University of Groningen, The Netherlands.
  12  * Copyright (c) 2001-2004, The GROMACS development team,
  13  * check out http://www.gromacs.org for more information.
  14
  15  * This program is free software; you can redistribute it and/or
  16  * modify it under the terms of the GNU General Public License
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  35
  36 #ifndef _macros_h
  37 #define _macros_h
  38
  39 #include "typedefs.h" /* for real definition only */
  40
  41 #ifdef __cplusplus
  42 extern "C" {
  43 #endif
  44
  45 /*
  46  * With the macros below you don't
  47  * have to use an index if you don't wan't to. You can eg. use
  48  * angle.C0[23] instead if angle.c[0][23].
  49  * In a similar fashion, you can use angle.AI[3] instead of
  50  * angle.a[0][3]
  51  */
  52 #define AI      a[0]
  53 #define AJ      a[1]
  54 #define AK      a[2]
  55 #define AL      a[3]
  56 #define AM      a[4]
  57 #define C0      c[0]
  58 #define C1      c[1]
  59 #define C2      c[2]
  60 #define C3      c[3]
  61 #define C4      c[4]
  62 #define C5      c[5]
  63
  64 #ifndef min
  65 #define min(a,b) (((a) < (b)) ? (a) : (b) )
  66 #endif
  67 #ifndef max
  68 #define max(a,b) (((a) > (b)) ? (a) : (b) )
  69 #endif
  70 #ifndef even
  71 #define even(a) ( ( (a+1) / 2) == (a / 2) )
  72 #endif
  73
  74 /* This macro calculates the size of a array */
  75 #define asize(a) (sizeof(a)/sizeof((a)[0]))
  76
  77 extern const real ZERO;
  78 extern const real THIRD;
  79 extern const real HALF;
  80 extern const real ONE;
  81 extern const real TWO;
  82 extern const real THREE;
  83 extern const real SIX;
  84 extern const real TEN;
  85 extern const real TWELVE;
  86
  87 #ifdef __cplusplus
  88 }
  89 #endif
  90
  91
  92 #endif  /* _macros_h */
  93