| NPDI | |
| Rrange_of_exception_ptrs | A concept that represent a "range" (list) of errors, in any kind of storage |
| Rinitializable_from | An object is initializable_from<G> if it can be initalized using the init_from member function from a reference of G |
| Rbuildable_from | An object is buildable_from<G> if it can be constructed using the init_from member function from a reference of G |