/***************************************************************************
 *   Copyright (C) 2005 by Christophe GONZALES and Pierre-Henri WUILLEMIN  *
 *   {prenom.nom}_at_lip6.fr                                               *
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 *   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.             *
 ***************************************************************************/
/**
 * @file
 * @brief Useful macros for maths.
 *
 * @author Christophe GONZALES and Pierre-Henri WUILLEMIN
 */
#ifndef GUM_MATH_H
#define GUM_MATH_H

#include <cmath>


#ifndef M_LOG2E
#  define M_LOG2E 1.4426950408889634074 /* log_2 e */
#endif

#ifndef M_PI
#  define M_PI 3.14159265358979323846
#endif

#ifndef M_LN2
#  define M_LN2 0.69314718055994530942 /* log_e 2 */
#endif

#ifndef GUM_LOG_SQRT_2PI   // std::log ( std::sqrt ( 2pi ) )
#  define GUM_LOG_SQRT_2PI .91893853320467274177
#endif

#endif /* GUM_MATH_H */
