5.2.12 Concatenation and Convex Hull

interval<T> concatenated(const interval<T>& o) const;
interval<T>& concatenate(const interval<T>& o);

concatenated(const interval<T>&)

Return a new interval, that contains both the current and the argument supplied interval.

concatenate(const interval<T>&)

Expand the current interval such that it also contains the supplied interval.