Abstract type for the branch-lengths in a <code><a href='SPLITT-colon-colon-Tree.html'>Tree</a></code>.

typedef Length LengthType;

A public typedef in class Tree. A synonym for the template argument Length. Defines a type that can be associated with a branch. Can be a basic type, e.g. double, but also a composite of several attributes on a branch, such as a double length and an int color.