/home/rex/ebltrunk/core/libidx/include/numerics.hpp

/***************************************************************************
 *   Copyright (C) 2008 by Yann LeCun and Pierre Sermanet *
 *   yann@cs.nyu.edu, pierre.sermanet@gmail.com *
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
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 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *     * Redistribution under a license not approved by the Open Source
 *       Initiative (http://www.opensource.org) must display the
 *       following acknowledgement in all advertising material:
 *        This product includes software developed at the Courant
 *        Institute of Mathematical Sciences (http://cims.nyu.edu).
 *     * The names of the authors may not be used to endorse or promote products
 *       derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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 * DISCLAIMED. IN NO EVENT SHALL ThE AUTHORS BE LIABLE FOR ANY
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 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 ***************************************************************************/

#ifndef NUMERICS_HPP_
#define NUMERICS_HPP_

namespace ebl {
  
  
  template <typename T>
  T limits<T>::max() {
#ifdef __NOSTL__
    eblerror("limits::max not implemented for this type");
#else
    return (std::numeric_limits<T>::max)();
#endif
  }
  
  template <typename T>
  T limits<T>::min() {
#ifdef __NOSTL__
      eblerror("limits::min not implemented for this type");
#else
      return (std::numeric_limits<T>::min)();
#endif
  }

  template <typename T> template <typename T2>
  T saturator<T>::saturate (T2 in) {
      if (in > limits<T>::max())
        return limits<T>::max();
      else if (in < limits<T>::min())
        return limits<T>::min();
      else
        return (T)in;
  }

  template <typename T>
  T angle_distance(T a1, T a2) {
    double d = (double) a1 - (double) a2;
    double fd = fabs(d);
    if (fd < TWOPI - fd)
      return (T) d;
    else {
      if (d < 0)
        return (T) (TWOPI - fd);
      else
        return (T) (fd - TWOPI);
    }
  }

#define saturate(in, T) (saturator<T>::saturate(in))  

} // end namespace ebl

#endif /* NUMERICS_HPP_ */