241     inner(C &cb) : cb(cb) {}  in foronly_string()
242     C &cb;  in foronly_string()  member
243     void handle_string(size_t N, const unsigned char *str) { cb(N, str); }  in foronly_string()
250     inner(C &cb) : cb(cb) {}  in foronly_unsigned()
251     C &cb;  in foronly_unsigned()  member
252     void handle_unsigned(uint64_t x) { cb(x); }  in foronly_unsigned()
259     inner(C &cb) : cb(cb) {}  in foreach_array()
260     C &cb;  in foreach_array()  member
261     void handle_array_elements(byte_range element) { cb(element); }  in foreach_array()
268     inner(C &cb) : cb(cb) {}  in foreach_map()
269     C &cb;  in foreach_map()  member
271       cb(key, value);  in foreach_map()