sqrsum.h

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// include guard
#ifndef AFF_SQRSUM_H_VERSION

#define AFF_SQRSUM_H_VERSION \
  "AFF_SQRSUM_H   V1.0   "


#include<aff/lib/collector.h>

namespace aff {

  namespace func {

    namespace util {

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

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

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

  } // namespace func

} // namespace aff

#endif // AFF_SQRSUM_H_VERSION (includeguard)

/* ----- END OF sqrsum.h ----- */