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

    private:
        unsigned long counter_;
    };
}

#endif // ABSVISITOR_HH_