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# offset.h

    00001 //
    00002 // offset.h
    00003 //
    00004 // Copyright (C) 1996 Limit Point Systems, Inc.
    00005 //
    00006 // Author: Curtis Janssen <cljanss@ca.sandia.gov>
    00007 // Maintainer: LPS
    00008 //
    00009 // This file is part of the SC Toolkit.
    00010 //
    00011 // The SC Toolkit is free software; you can redistribute it and/or modify
    00012 // it under the terms of the GNU Library General Public License as published by
    00013 // the Free Software Foundation; either version 2, or (at your option)
    00014 // any later version.
    00015 //
    00016 // The SC Toolkit is distributed in the hope that it will be useful,
    00017 // but WITHOUT ANY WARRANTY; without even the implied warranty of
    00018 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    00019 // GNU Library General Public License for more details.
    00020 //
    00021 // You should have received a copy of the GNU Library General Public License
    00022 // along with the SC Toolkit; see the file COPYING.LIB.  If not, write to
    00023 // the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
    00024 //
    00025 // The U.S. Government is granted a limited license as per AL 91-7.
    00026 //
    00027
    00028 #ifndef _math_scmat_offset_h
    00029 #define _math_scmat_offset_h
    00030
    00031 #ifdef __c_plus_plus
    00032
    00033 namespace sc {
    00034
    00035 static inline int
    00036 i_offset(int i)
    00037 {
    00038   return ((i*(i+1)) >> 1);
    00039 }
    00040
    00041 static inline int
    00042 ij_offset(int i, int j)
    00043 {
    00044   return (i>j) ? (((i*(i+1)) >> 1) + j) : (((j*(j+1)) >> 1) + i);
    00045 }
    00046
    00047 static inline int
    00048 igtj_offset(int i, int j)
    00049 {
    00050   return ((i*(i+1)) >> 1) + j;
    00051 }
    00052
    00053 }
    00054
    00055 #else
    00056
    00057 #define i_offset(i) (((i)*((i)+1))>>1)
    00058 #define ij_offset(i,j) (((i)>(j))?(i_offset(i)+(j)):(i_offset(j)+(i)))
    00059 #define igtj_offset(i,j) (i_offset(i)+(j))
    00060
    00061 #endif
    00062
    00063 #endif