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### Template Class quaternion

    namespace boost{ namespace math{

    template<typename T>
    class quaternion
    {
    public:

       typedef T value_type;

       explicit quaternion(T const & requested_a = T(), T const & requested_b = T(), T const & requested_c = T(), T const & requested_d = T());
       explicit quaternion(::std::complex<T> const & z0, ::std::complex<T> const & z1 = ::std::complex<T>());
       template<typename X>
       explicit quaternion(quaternion<X> const & a_recopier);

       T                  real() const;
       quaternion<T>      unreal() const;
       T                  R_component_1() const;
       T                  R_component_2() const;
       T                  R_component_3() const;
       T                  R_component_4() const;
       ::std::complex<T>  C_component_1() const;
       ::std::complex<T>  C_component_2() const;

       quaternion<T>&     operator = (quaternion<T> const  & a_affecter);
       template<typename X>
       quaternion<T>&     operator = (quaternion<X> const  & a_affecter);
       quaternion<T>&     operator = (T const  & a_affecter);
       quaternion<T>&     operator = (::std::complex<T> const & a_affecter);

       quaternion<T>&     operator += (T const & rhs);
       quaternion<T>&     operator += (::std::complex<T> const & rhs);
       template<typename X>
       quaternion<T>&     operator += (quaternion<X> const & rhs);

       quaternion<T>&     operator -= (T const & rhs);
       quaternion<T>&     operator -= (::std::complex<T> const & rhs);
       template<typename X>
       quaternion<T>&     operator -= (quaternion<X> const & rhs);

       quaternion<T>&     operator *= (T const & rhs);
       quaternion<T>&     operator *= (::std::complex<T> const & rhs);
       template<typename X>
       quaternion<T>&     operator *= (quaternion<X> const & rhs);

       quaternion<T>&     operator /= (T const & rhs);
       quaternion<T>&     operator /= (::std::complex<T> const & rhs);
       template<typename X>
       quaternion<T>&     operator /= (quaternion<X> const & rhs);
    };

    } // namespace math
    } // namespace boost