math.h

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/*
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation;
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 *
 * FreeBSD log2 patch from graphviz port to FreeBSD 9, courtesy of
 * Christoph Moench-Tegeder <cmt@burggraben.net>
 */
 
// It is recommended to include this header instead of <math.h> or
// <cmath> whenever the log2(x) function is needed.  See bug 1467.
 
#ifndef MATH_H
#define MATH_H
 
#include <cmath>
 
#ifdef __FreeBSD__
 
#if __FreeBSD_version <= 704101 || (__FreeBSD_version >= 800000 && __FreeBSD_version < 802502) ||  \
    (__FreeBSD_version >= 900000 && __FreeBSD_version < 900027)
#define log2(x) (std::log(x) / M_LN2)
#endif /* __FreeBSD_version */
 
#endif /* __FreeBSD__ */
 
#endif /* MATH_H */