I don't like "services" much, especially the plural form. The object of this class would be number of services or a single service? And after all, this class is just more convenient and high-level interface to lower-level interfaces, so I don't think "services" is a good name. Maybe just leave "named_" prefix, but cut out the "_object" which doesn't add much information. Then you will have named_shared_memory named_mapped_file named_heap_memory etc.
Some users have suggested more descriptive names: objects_in_shared_memory objects_in_mapped_file objects_in_heap_memory objects_in_user_memory A bit long but I think the class expresses very clearly its use. We can make it shorter with "objects_in_shmem"/"objects_in_mfile", but is not very pronounceable. This name issue is harder than the review! Comments? Best, Ion