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<hr><h1>offset.h</h1><div class="fragment"><pre>00001 <font class="comment">//</font>
00002 <font class="comment">// offset.h</font>
00003 <font class="comment">//</font>
00004 <font class="comment">// Copyright (C) 1996 Limit Point Systems, Inc.</font>
00005 <font class="comment">//</font>
00006 <font class="comment">// Author: Curtis Janssen <cljanss@ca.sandia.gov></font>
00007 <font class="comment">// Maintainer: LPS</font>
00008 <font class="comment">//</font>
00009 <font class="comment">// This file is part of the SC Toolkit.</font>
00010 <font class="comment">//</font>
00011 <font class="comment">// The SC Toolkit is free software; you can redistribute it and/or modify</font>
00012 <font class="comment">// it under the terms of the GNU Library General Public License as published by</font>
00013 <font class="comment">// the Free Software Foundation; either version 2, or (at your option)</font>
00014 <font class="comment">// any later version.</font>
00015 <font class="comment">//</font>
00016 <font class="comment">// The SC Toolkit is distributed in the hope that it will be useful,</font>
00017 <font class="comment">// but WITHOUT ANY WARRANTY; without even the implied warranty of</font>
00018 <font class="comment">// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the</font>
00019 <font class="comment">// GNU Library General Public License for more details.</font>
00020 <font class="comment">//</font>
00021 <font class="comment">// You should have received a copy of the GNU Library General Public License</font>
00022 <font class="comment">// along with the SC Toolkit; see the file COPYING.LIB. If not, write to</font>
00023 <font class="comment">// the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.</font>
00024 <font class="comment">//</font>
00025 <font class="comment">// The U.S. Government is granted a limited license as per AL 91-7.</font>
00026 <font class="comment">//</font>
00027
00028 <font class="preprocessor">#ifndef _math_scmat_offset_h</font>
00029 <font class="preprocessor"></font><font class="preprocessor">#define _math_scmat_offset_h</font>
00030 <font class="preprocessor"></font>
00031 <font class="preprocessor">#ifdef __c_plus_plus</font>
00032 <font class="preprocessor"></font>
00033 <font class="keyword">namespace </font>sc {
00034
00035 <font class="keyword">static</font> <font class="keyword">inline</font> <font class="keywordtype">int</font>
00036 i_offset(<font class="keywordtype">int</font> i)<font class="keyword"></font>
00037 <font class="keyword"></font>{
00038 <font class="keywordflow">return</font> ((i*(i+1)) >> 1);
00039 }
00040
00041 <font class="keyword">static</font> <font class="keyword">inline</font> <font class="keywordtype">int</font>
00042 ij_offset(<font class="keywordtype">int</font> i, <font class="keywordtype">int</font> j)<font class="keyword"></font>
00043 <font class="keyword"></font>{
00044 <font class="keywordflow">return</font> (i>j) ? (((i*(i+1)) >> 1) + j) : (((j*(j+1)) >> 1) + i);
00045 }
00046
00047 <font class="keyword">static</font> <font class="keyword">inline</font> <font class="keywordtype">int</font>
00048 igtj_offset(<font class="keywordtype">int</font> i, <font class="keywordtype">int</font> j)<font class="keyword"></font>
00049 <font class="keyword"></font>{
00050 <font class="keywordflow">return</font> ((i*(i+1)) >> 1) + j;
00051 }
00052
00053 }
00054
00055 <font class="preprocessor">#else</font>
00056 <font class="preprocessor"></font>
00057 <font class="preprocessor">#define i_offset(i) (((i)*((i)+1))>>1)</font>
00058 <font class="preprocessor"></font><font class="preprocessor">#define ij_offset(i,j) (((i)>(j))?(i_offset(i)+(j)):(i_offset(j)+(i)))</font>
00059 <font class="preprocessor"></font><font class="preprocessor">#define igtj_offset(i,j) (i_offset(i)+(j))</font>
00060 <font class="preprocessor"></font>
00061 <font class="preprocessor">#endif</font>
00062 <font class="preprocessor"></font>
00063 <font class="preprocessor">#endif</font>
</font></div></pre><hr>
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