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+
+///////////////////////////////////////////////////////////////////////////
+// This program is free software: you can redistribute it and/or modify  //
+// it under the terms of the version 3 of the GNU General Public License //
+// as published by the Free Software Foundation.                         //
+//                                                                       //
+// This program is distributed in the hope that it will be useful, but   //
+// WITHOUT ANY WARRANTY; without even the implied warranty of            //
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU      //
+// General Public License for more details.                              //
+//                                                                       //
+// You should have received a copy of the GNU General Public License     //
+// along with this program. If not, see <http://www.gnu.org/licenses/>.  //
+//                                                                       //
+// Written by Francois Fleuret, (C) IDIAP                                //
+// Contact <francois.fleuret@idiap.ch> for comments & bug reports        //
+///////////////////////////////////////////////////////////////////////////
+
+#ifndef PI_FEATURE_FAMILY_H
+#define PI_FEATURE_FAMILY_H
+
+#include "misc.h"
+#include "pose_cell_set.h"
+#include "pi_feature.h"
+
+class PiFeatureFamily : public Storable {
+  int _nb_features;
+  PiFeature *_pi_features;
+
+public:
+  PiFeatureFamily();
+  ~PiFeatureFamily();
+
+  inline int nb_features() { return _nb_features; }
+
+  inline PiFeature *get_feature(int f) {
+    ASSERT(f >= 0 && f < _nb_features);
+    return _pi_features + f;
+  }
+
+  void read(istream *is);
+  void write(ostream *os);
+
+  void resize(int nb_features);
+  void randomize(int level);
+
+  void extract(PiFeatureFamily *pi_feature_family, bool *used_features, int *new_feature_indexes);
+};
+
+#endif