https://svn.boost.org/trac10/ticket/8807 <p> I was looking today for a range adapter that would take two sorted ranges with the same value type and present the union of those sets. Seems like a natural fit for this library. </p> en-us /htdocs/site/boost.png https://svn.boost.org/trac10/ticket/8807 Trac 1.4.3