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QVM: Quaternions, Vectors, Matrices

quat_traits_defaults

#include <boost/qvm/quat_traits_defaults.hpp>

namespace boost
{
    namespace qvm
    {
        template <class QuatType,class ScalarType>
        struct quat_traits_defaults
        {
            typedef QuatType quat_type;
            typedef ScalarType scalar_type;
        
            template <int I>
            static BOOST_QVM_INLINE_CRITICAL
            scalar_type read_element( quat_type const & x )
            {
                return quat_traits<quat_type>::template write_element<I>(const_cast<quat_type &>(x));
            }
        };
    }
}

The quat_traits_defaults template is designed to be used as a public base for user-defined specializations of the quat_traits template, to easily define the required members. If it is used, the only member that must be defined by the user in a quat_traits specialization is write_element; the quat_traits_defaults base will define read_element, as well as scalar_type automatically.