constant_evaluator.h

#ifndef PROBFD_HEURISTICS_CONSTANT_EVALUATOR_H
#define PROBFD_HEURISTICS_CONSTANT_EVALUATOR_H
 
#include "probfd/evaluator.h"
#include "probfd/task_evaluator_factory.h"
#include "probfd/type_traits.h"
#include "probfd/value_type.h"
 
namespace probfd::heuristics {
 
template <typename State>
class ConstantEvaluator : public Evaluator<State> {
    const value_t value_;
 
public:
    explicit ConstantEvaluator(value_t value)
        : value_(value)
    {
    }
 
    [[nodiscard]]
    value_t evaluate(param_type<State>) const override
    {
        return value_;
    }
};
 
template <typename State>
class BlindEvaluator : public ConstantEvaluator<State> {
public:
    BlindEvaluator()
        : ConstantEvaluator<State>(0_vt)
    {
    }
};
 
class BlindEvaluatorFactory : public TaskEvaluatorFactory {
public:
    std::unique_ptr<FDREvaluator> create_evaluator(
        std::shared_ptr<ProbabilisticTask> task,
        std::shared_ptr<FDRCostFunction> task_cost_function) override;
};
 
} // namespace probfd::heuristics
 
#endif // PROBFD_HEURISTICS_CONSTANT_EVALUATOR_H