Real.h

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//
// Copyright (c) 2009, Markus Rickert
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// * Redistributions of source code must retain the above copyright 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.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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#ifndef RL_MATH_REAL_H
#define RL_MATH_REAL_H
 
#include <cmath>
 
namespace rl
{
    namespace math
    {
        typedef double Real;
        
        template<typename T>
        inline T cbrt(const T& arg)
        {
            if (arg < 0)
            {
                return -::std::pow(-arg, static_cast<T>(1.0 / 3.0));
            }
            else
            {
                return ::std::pow(arg, static_cast<T>(1.0 / 3.0));
            }
        }
        
        template<typename T>
        inline T sign(const T& arg)
        {
            if (arg > 0)
            {
                return 1;
            }
            else if (arg < 0)
            {
                return -1;
            }
            else
            {
                return 0;
            }
        }
    }
}
 
#endif // RL_MATH_REAL_H