AbsVisitor.h

Go to the documentation of this file.

#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_