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