1 files changed, 8 insertions, 0 deletions
diff --git a/decoder/ffset.h b/decoder/ffset.h
index 28aef667..a69a75fa 100644
--- a/decoder/ffset.h
+++ b/decoder/ffset.h
@@ -1,6 +1,7 @@
 #ifndef _FFSET_H_
 #define _FFSET_H_
 
+#include <utility>
 #include <vector>
 #include "value_array.h"
 #include "prob.h"
@@ -47,11 +48,18 @@ class ModelSet {
 
   bool stateless() const { return !state_size_; }
 
+  // Part of a feature state may be used for storing some side data for
+  // calculating feature values but not necessary for splitting hypernodes. Such
+  // bytes needs to be erased for hypernode splitting.
+  bool NeedsStateErasure() const;
+  void EraseIgnoredBytes(FFState* state) const;
+
  private:
   std::vector<const FeatureFunction*> models_;
   const std::vector<double>& weights_;
   int state_size_;
   std::vector<int> model_state_pos_;
+  std::vector<std::pair<int, int> > ranges_to_erase_;
 };
 
 #endif