fixed deep copy of label bug

1 files changed, 1 insertions, 0 deletions

diff --git a/vowpalwabbit/parse_primitives.h b/vowpalwabbit/parse_primitives.h
index d9a99652..57a6cebf 100644
--- a/vowpalwabbit/parse_primitives.h
+++ b/vowpalwabbit/parse_primitives.h
@@ -51,6 +51,7 @@ struct label_parser {
   void (*delete_label)(void*);
   float (*get_weight)(void*);
   float (*get_initial)(void*);
+  void (*copy_label)(void*&,void*); // copy_label(dst,src) performs a DEEP copy of src into dst (dst is allocated correctly).  if this function is NULL, then we assume that a memcpy of size label_size is sufficient, so you need only specify this function if your label constains, for instance, pointers (otherwise you'll get double-free errors)
   size_t label_size;
 };