text: #include "feature_index.h"
  
  #include <util/stream/output.h>
  
  // Impossible to do one templated Out because function template partial specialization is not allowed
  
  template <>
  void Out<NCB::TFloatFeatureIdx>(IOutputStream& output, const NCB::TFloatFeatureIdx& floatFeatureIdx) {
      output << "float feature #" << *floatFeatureIdx;
  }
  
  template <>
  void Out<NCB::TCatFeatureIdx>(IOutputStream& output, const NCB::TCatFeatureIdx& catFeatureIdx) {
      output << "categorical feature #" << *catFeatureIdx;
  }
  