// Copyright 2007 Georgia Institute of Technology. All rights reserved.
// ABSOLUTELY NOT FOR DISTRIBUTION
/**
 * @file math.h
 *
 * Includes all basic FASTlib non-vector math utilities.
 */

#ifndef MATH_MATH_H
#define MATH_MATH_H

#include "discrete.h"
#include "kernel.h"
#include "geometry.h"

/**
 * Namespace with a variety of math routines.
 */
namespace math {
  /** Squares a number. */
  template<typename T>
  inline T Sqr(T v) {
    return v * v;
  }
  
  /**
   * Forces a number to be non-negative, turning negative numbers into zero.
   *
   * Avoids branching costs (yes, we've discovered measurable improvements).
   */
  inline double ClampNonNegative(double d) {
    return (d + fabs(d)) / 2;
  }

  /**
   * Forces a number to be non-positive, turning positive numbers into zero.
   *
   * Avoids branching costs (yes, we've discovered measurable improvements).
   */
  inline double ClampNonPositive(double d) {
    return (d - fabs(d)) / 2;
  }
};

#endif