third_party/boost/math/quaternion.hpp
explicit            quaternion( T const & requested_a = T(),
                                            T const & requested_b = T(),
                                            T const & requested_c = T(),
                                            T const & requested_d = T())
            :   a(requested_a),
                b(requested_b),
                c(requested_c),
                d(requested_d)
            {
                // nothing to do!
            }
// constructor for H seen as R^4
// (also default constructor)

constructor for H seen as R^4
(also default constructor)
constructor for H seen as R^4 ( also default constructor )
explicit            quaternion( T const & requested_a = T(),
                                            T const & requested_b = T(),
                                            T const & requested_c = T(),
                                            T const & requested_d = T())
            :   a(requested_a),
                b(requested_b),
                c(requested_c),
                d(requested_d)
            {
            }
explicit quaternion ( T const & requested_a = T ( ) , T const & requested_b = T ( ) , T const & requested_c = T ( ) , T const & requested_d = T ( ) ) : a ( requested_a ) , b ( requested_b ) , c ( requested_c ) , d ( requested_d ) { }
constructor for H seen as R^4
(also default constructor)
constructor for H seen as R^4 ( also default constructor )
// nothing to do!
