const pb_field_t *start; /* Start of the pb_field_t array */
const pb_field_t *pos; /* Current position of the iterator */
unsigned required_field_index; /* Zero-based index that counts only the required fields */
- void *dest_struct; /* Pointer to the destination structure to decode to */
- void *pData; /* Pointer where to store current field value */
- void *pSize; /* Pointer where to store the size of current array field */
+ void *dest_struct; /* Pointer to start of the structure */
+ void *pData; /* Pointer to current field value */
+ void *pSize; /* Pointer to count/has field */
} pb_field_iter_t;
-/* Initialize the field iterator structure to beginning. */
-void pb_field_iter_begin(pb_field_iter_t *iter, const pb_field_t *fields, void *dest_struct);
+/* Initialize the field iterator structure to beginning.
+ * Returns false if the message type is empty. */
+bool pb_field_iter_begin(pb_field_iter_t *iter, const pb_field_t *fields, void *dest_struct);
/* Advance the iterator to the next field.
* Returns false when the iterator wraps back to the first field. */