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** Ifdefs
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#ifndef ECL_MATH_CONSTANTS_HPP_
#define ECL_MATH_CONSTANTS_HPP_

/*****************************************************************************
** Includes
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#include <cmath>

/*****************************************************************************
** Namespaces
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namespace ecl {

#ifdef M_PI // defined by all POSIX systems and some non-POSIX ones
    double const pi = M_PI;
    const double two_pi  = 2.0*pi;
    const double pi_2    = pi/2.0;
    const double pi_4    = pi/4.0;
    const float  two_pi_f= two_pi;
    const float  pi_f    = pi;
    const float  pi_2_f  = pi_2;
    const float  pi_4_f  = pi_4;
#else
    double const pi = 4.0*std::atan(1.0);
    const double two_pi  = 2.0*pi;
    const double pi_2    = pi/2.0;
    const double pi_4    = pi/4.0;
    const float  two_pi_f= two_pi;
    const float  pi_f    = pi;
    const float  pi_2_f  = pi_2;
    const float  pi_4_f  = pi_4;
#endif

// Above method of setting is more intelligent.
//const double two_pi  = 6.283185307179586476925286766559005768394338798750211641949888;  /**< @brief Mathematical constant for 2*pi. */
//const double pi      = 3.141592653589793238462643383279502884197169399375105820974944;  /**< @brief Mathematical constant for pi. */
//const double pi_2    = 1.57079632679489661923;  /**< @brief Mathematical constant for pi/2. */
//const double pi_4    = 0.78539816339744830962;  /**< @brief Mathematical constant for pi/4. */
//const float  two_pi_f= 6.283185307179586476925286766559005768394338798750211641949888;  /**< @brief Mathematical constant (float format) for 2*pi. */
//const float  pi_f    = 3.141592653589793238462643383279502884197169399375105820974944;  /**< @brief Mathematical constant (float format) for pi. */
//const float  pi_2_f  = 1.57079632679489661923;  /**< @brief Mathematical constant (float format) for pi/2. */
//const float  pi_4_f  = 0.78539816339744830962;  /**< @brief Mathematical constant (float format) for pi/4. */


} // namespace ecl

#endif /*ECL_MATH_CONSTANTS_HPP_*/