avg.h

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// include guard
#ifndef AFF_AVG_H_VERSION

#define AFF_AVG_H_VERSION \
  "AFF_AVG_H   V1.1   "


#include<aff/lib/collector.h>

namespace aff {

  namespace func {

    namespace util {

      template<class C>
        class Extractavg {
          typedef typename C::Tcoc Tcont;
          typedef typename C::Tvalue Tvalue;
          public:
            typedef Tvalue Tretval;
            Extractavg(const Tcont& c): Msum(0), Mn(0) { }
            void operator() (const Tvalue& v) { Msum+=v; ++Mn; }
            Tretval result() const { return(Msum/Tvalue(Mn)); }
          private:
            Tvalue Msum;
            int Mn;
        }; // class Extractavg
      
    } // namespace util

/*----------------------------------------------------------------------*/

    template<class C>
      typename C::Tvalue avg(const C& c)
      {
        return(aff::func::util::collect<C, aff::func::util::Extractavg>(c));
      } // avg()

  } // namespace func

} // namespace aff

#endif // AFF_AVG_H_VERSION (includeguard)

/* ----- END OF avg.h ----- */