/****************************************************************************
 *   This file is part of the aGrUM/pyAgrum library.                        *
 *                                                                          *
 *   Copyright (c) 2005-2026 by                                             *
 *       - Pierre-Henri WUILLEMIN(_at_LIP6)                                 *
 *       - Christophe GONZALES(_at_AMU)                                     *
 *                                                                          *
 *   The aGrUM/pyAgrum library is free software; you can redistribute it    *
 *   and/or modify it under the terms of either :                           *
 *                                                                          *
 *    - the GNU Lesser General Public License as published by               *
 *      the Free Software Foundation, either version 3 of the License,      *
 *      or (at your option) any later version,                              *
 *    - the MIT license (MIT),                                              *
 *    - or both in dual license, as here.                                   *
 *                                                                          *
 *   (see https://agrum.gitlab.io/articles/dual-licenses-lgplv3mit.html)    *
 *                                                                          *
 *   This aGrUM/pyAgrum library is distributed in the hope that it will be  *
 *   useful, but WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,          *
 *   INCLUDING BUT NOT LIMITED TO THE WARRANTIES MERCHANTABILITY or FITNESS *
 *   FOR A PARTICULAR PURPOSE  AND NONINFRINGEMENT. IN NO EVENT SHALL THE   *
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 *   ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR  *
 *   OTHER DEALINGS IN THE SOFTWARE.                                        *
 *                                                                          *
 *   See LICENCES for more details.                                         *
 *                                                                          *
 *   SPDX-FileCopyrightText: Copyright 2005-2026                            *
 *       - Pierre-Henri WUILLEMIN(_at_LIP6)                                 *
 *       - Christophe GONZALES(_at_AMU)                                     *
 *   SPDX-License-Identifier: LGPL-3.0-or-later OR MIT                      *
 *                                                                          *
 *   Contact  : info_at_agrum_dot_org                                       *
 *   homepage : http://agrum.gitlab.io                                      *
 *   gitlab   : https://gitlab.com/agrumery/agrum                           *
 *                                                                          *
 ****************************************************************************/


/**
 * @file
 * @brief Useful macros for maths.
 *
 * @author Christophe GONZALES(_at_AMU) and Pierre-Henri WUILLEMIN(_at_LIP6)
 */
#ifndef GUM_MATH_H
#define GUM_MATH_H

#include <cmath>
#include <limits>

#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

#define GUM_LOG2_OR_0(x) ((x == 0.0) ? 0.0 : std::log2((x)))

// redefined due to a strange bug in visual c++
namespace gum {
  template < typename T >
  bool isCloseToZero(T x, T tol = T(1e-9));

  template < typename T >
  bool isCloseToOne(T x, T tol = T(1e-9));

  template < typename T >
  bool isfinite(T arg);
}   // namespace gum

#include <agrum/base/core/math/math_utils_tpl.h>

#endif /* GUM_MATH_H */
