/*!
*\brief Abstract class providing label extraction for some data_block_0 subtypes.
+ *
* This class cannot be instantiated.\n
*/
class data_block_0_label_extractor
- : public virtual data_block_0
+ : public data_block_0
{
protected:
data_block_0_label_extractor(data_block_0 &);
-protected:
+protected:
vector<string> get_labels();
};