Ring.h

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/* ----------------------------------------------------------------------------
 
 * GTSAM Copyright 2010, Georgia Tech Research Corporation,
 * Atlanta, Georgia 30332-0415
 * All Rights Reserved
 * Authors: Frank Dellaert, et al. (see THANKS for the full author list)
 
 * See LICENSE for the license information
 
 * -------------------------------------------------------------------------- */
 
#pragma once
 
#include <algorithm>
 
struct Ring {
  static inline double zero() { return 0.0; }
  static inline double one() { return 1.0; }
  static inline double add(const double& a, const double& b) { return a + b; }
  static inline double max(const double& a, const double& b) {
    return std::max(a, b);
  }
  static inline double mul(const double& a, const double& b) { return a * b; }
  static inline double div(const double& a, const double& b) {
    return (a == 0 || b == 0) ? 0 : (a / b);
  }
  static inline double id(const double& x) { return x; }
  static inline double negate(const double& x) { return -x; }
};