q_traits<Q>::w
template <int I> static inline scalar_type & w( Quaternion & q );
This function template is expected to be static member of user-defined specializations of the q_traits template. It returns a mutable reference to the I-th element of q.
Note: For the quaternion a + bi + cj + dk, the elements are assumed to be in the following order: a, b, c, d; that is, I=0/1/2/3 would access a/b/c/d.
Copyright (c) 2008-2013 by Emil Dotchevski and Reverge Studios, Inc.
Distributed under the Boost Software License, Version 1.0.