If neither SEH nor signal handling is required, the handler impls do not have to do anything, and can be empty.

required

Note: The type after -> is weird, because VS2015 cannot parse the expression used in the typedef inside, when it is in return type. Yeah.

This is the overload that takes a string and infers the Equals matcher from it The more general overload, that takes any string matcher, is in catch_c

TrackerBase interface