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#ifndef LM_ENUMERATE_VOCAB_H
#define LM_ENUMERATE_VOCAB_H

#include "word_index.hh"
#include "../util/string_piece.hh"

namespace lm {

/* If you need the actual strings in the vocabulary, inherit from this class
 * and implement Add.  Then put a pointer in Config.enumerate_vocab; it does
 * not take ownership.  Add is called once per vocab word.  index starts at 0
 * and increases by 1 each time.  This is only used by the Model constructor;
 * the pointer is not retained by the class.
 */
class EnumerateVocab {
  public:
    virtual ~EnumerateVocab() {}

    virtual void Add(WordIndex index, const StringPiece &str) = 0;

  protected:
    EnumerateVocab() {}
};

} // namespace lm

#endif // LM_ENUMERATE_VOCAB_H