| 472 | |
| 473 | std::vector<std::string> all_keys() const final { return {}; } |
| 474 | const std::type_info *type_of(const std::string &) const final { return type_; } |
| 475 | size_t count_of(const std::string &) const final { return 0; } |
| 476 | |
| 477 | void set(const std::string &name, const void *value, size_t) final { |