ATTOW, the parameterization of the sorter tests relies on testing against the "concept" of a sorter, implemented by a common interface that abstracts over the (mostly) syntax differences of the differently backed sorters. Each "backend," file or container based, requires a shim that satisfies the C++ concept. We have this for the file based sorter, and a portion of it for the container based sorter, but we will need to complete it. This will let us add the container flavored sorter to the rest of the "generic" tests.