ranker.h

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#ifndef META_RANKER_H_
#define META_RANKER_H_

#include <utility>
#include <vector>

#include "meta.h"

namespace meta
{

namespace corpus
{
class document;
}

namespace index
{
class inverted_index;
struct score_data;
}
}

namespace meta
{
namespace index
{

class ranker
{
  public:
    std::vector<std::pair<doc_id, double>>
    score(inverted_index& idx, corpus::document& query,
          uint64_t num_results = 10,
          const std::function<bool(doc_id d_id)>& filter = [](doc_id) {
              return true;
          });

    virtual double score_one(const score_data& sd) = 0;

    virtual double initial_score(const score_data& sd) const;

    virtual ~ranker() = default;

  private:
    std::vector<double> results_;
};
}
}

#endif