    // Copyright (C) 2010  Davis E. King (davis@dlib.net)
    // License: Boost Software License   See LICENSE.txt for the full license.
    #undef DLIB_MULTICLASS_TOoLS_ABSTRACT_H__
    #ifdef DLIB_MULTICLASS_TOoLS_ABSTRACT_H__

    #include <vector>
    #include <map>
    #include "../unordered_pair.h"

    namespace dlib
    {

    // ----------------------------------------------------------------------------------------

        template <typename label_type>
        std::vector<label_type> select_all_distinct_labels (
            const std::vector<label_type>& labels
        );
        /*!
            ensures
                - Determines all distinct values present in labels and stores them
                  into a sorted vector and returns it.  They are sorted in ascending
                  order.
        !*/

    // ----------------------------------------------------------------------------------------

        template <typename label_type, typename U>
        std::vector<unordered_pair<label_type> > find_missing_pairs (
            const std::map<unordered_pair<label_type>,U>& binary_decision_functions
        );
        /*!
            ensures
                - Let L denote the set of all label_type values present in binary_decision_functions.
                - This function finds all the label pairs with both elements distinct and in L but
                  not also in binary_decision_functions.  All these missing pairs are stored
                  in a sorted vector and returned.  They are sorted in ascending order.
        !*/

    // ----------------------------------------------------------------------------------------

    }

    #endif // DLIB_MULTICLASS_TOoLS_ABSTRACT_H__