experimental shogun labels design

gistfile1.cpp

template <typename LabelType, LabelStoreType>
class CLabels: public CSGObject
{
public:
    virtual int32_t get_num_classes() const = 0;
    virtual const LabelType& get_label(int32_t index) const
    {
        check_out_of_range(index);
        return cast_label(m_labels[index]);
    }

protected:
    virtual const LabelType& cast_label(const LabelStoreType& label)=0;

    SGVector<LabelStoreType> m_labels;
};

class CBinaryLabels: public CLabels<bool, float64_t>
{
public:
    virtual int32_t get_num_classes() const { return 2; }

protected:
    virtual const bool& cast_label(const float64_t& label) { return label > 0; }
};

class CRealLabels: public CLabels<float64_t, float64_t>
{
public:
    virtual int32_t get_num_classes() const { return inf; }

protected:
    virtual const float64_t& cast_label(const float64_t label) { return label; }
}