/*!
\page p_mask4 Mask4

The Mask4 type represents an aggregate of four true or false conditions.  You can think of the
Mask4 type as representing an array of four boolean values.  The math library has comparison
functions that generate Mask4 results.  For example, you can compare two Vector4 types to generate
a Mask4.  Mask4's may also be used to "select" between Vector4 objects.  This
ability allows "conditional" code to be written that does not contain any branch
instuctions.

*/
