absmax.h

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// include guard
#ifndef AFF_ABSMAX_H_VERSION

#define AFF_ABSMAX_H_VERSION \
  "AFF_ABSMAX_H   V1.0   "

#include<aff/lib/collector.h>

namespace aff {

  namespace func {

    namespace util {

      template<class C>
        class Extractabsmax {
          typedef typename C::Tcoc Tcont;
          typedef typename C::Tvalue Tvalue;
          public:
            typedef Tvalue Tretval;
            Extractabsmax(const Tcont& c): Mval(c(c.first())) 
            { 
              if (Mval<0) { Mval = -Mval; }
            }
            void operator() (const Tvalue& v) 
            { 
              Tvalue av = v < 0 ? -v : v;
              Mval = Mval > av ? Mval : av; 
            }
            Tretval result() const { return(Mval); }
          private:
            Tvalue Mval;
        }; // class Extractabsmax
      
    } // namespace util

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

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

  } // namespace func

} // namespace aff

#endif // AFF_ABSMAX_H_VERSION (includeguard)

/* ----- END OF absmax.h ----- */