TriggerExpressionEvaluator.h

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#ifndef HLTrigger_HLTfilters_TriggerExpressionEvaluator_h
#define HLTrigger_HLTfilters_TriggerExpressionEvaluator_h

#include <iostream>

namespace triggerExpression {

  class Data;

  class Evaluator {
  public:
    Evaluator() {}

    // pure virtual, need a concrete implementation
    virtual bool operator()(const Data& data) const = 0;

    // virtual function, do nothing unless overridden
    virtual void init(const Data& data) {}

    // pure virtual, need a concrete implementation
    virtual void dump(std::ostream& out) const = 0;

    // virtual destructor
    virtual ~Evaluator() {}
  };

  inline std::ostream& operator<<(std::ostream& out, const Evaluator& eval) {
    eval.dump(out);
    return out;
  }

}  // namespace triggerExpression

#endif  // HLTrigger_HLTfilters_TriggerExpressionEvaluator_h