AbsVisitor.h

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#ifndef NPSTAT_ABSVISITOR_HH_
#define NPSTAT_ABSVISITOR_HH_

namespace npstat {
  template <typename Input, typename Result>
  struct AbsVisitor {
    inline virtual ~AbsVisitor() {}

    virtual void clear() = 0;

    virtual void process(const Input& value) = 0;

    virtual Result result() = 0;
  };

  template <typename Input>
  class VisitCounter : public AbsVisitor<Input, unsigned long> {
  public:
    inline VisitCounter() : counter_(0UL) {}
    inline virtual ~VisitCounter() {}

    inline void clear() { counter_ = 0UL; }
    inline void process(const Input&) { ++counter_; }
    inline unsigned long result() { return counter_; }

  private:
    unsigned long counter_;
  };
}  // namespace npstat

#endif  // ABSVISITOR_HH_