heuristic.h

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/*
 * heuristic.h
 *
 * LICENSE HERE
 *
 *  Created on: 2016-08-23
 *      Author: Rick Valenzano
 */

#ifndef HEURISTIC_H_
#define HEURISTIC_H_

template<class state_t>
class Heuristic
{
public:
    Heuristic();

    virtual ~Heuristic();

    virtual void prepareToCompute();

    double getHValue(const state_t &state);

    double getLastHValue() const;

    bool isHValueStored() const;

protected:
    virtual double computeHValue(const state_t &state) const = 0;

private:
    double last_h; 

    bool h_stored; 
};

template<class state_t>
Heuristic<state_t>::Heuristic()
        : last_h(0.0), h_stored(false)
{
}

template<class state_t>
Heuristic<state_t>::~Heuristic()
{
}

template<class state_t>
double Heuristic<state_t>::getHValue(const state_t& state)
{
    last_h = computeHValue(state);

    h_stored = true;
    return last_h;
}

template<class state_t>
inline double Heuristic<state_t>::getLastHValue() const
{
    return last_h;
}

template<class state_t>
void Heuristic<state_t>::prepareToCompute()
{
    last_h = -1.0;
    h_stored = false;
}

template<class state_t>
inline bool Heuristic<state_t>::isHValueStored() const
{
    return h_stored;
}

#endif /* HEURISTIC_H_ */