decr()

StridedStepper & aff::util::StridedStepper::decr

(

)

decrement offset - return reference to itself

previous position

Definition at line 91 of file stridedstepper.cc.

References aff::Strided::first(), aff::Strided::last(), less(), Mcarry, Mcurrent, Mindex, aff::Strided::Mmax_dimen, Mshape, Mvalid, and aff::Strided::stride().

Referenced by steppers().

    {
      if (!this->less()) Mvalid=false;
      Tsubscript i=0;
      while (i<Tshape::Mmax_dimen)
      {
        --Mindex[i];
        Mcurrent-=Mshape.stride(i);
        if (Mindex[i]<Mshape.first(i)) 
        {
          Mindex[i]=Mshape.last(i);
          Mcurrent+=Mcarry[i];
          ++i;
        }
        else
        {
          i=Tshape::Mmax_dimen;
        }
      }
      return(*this);
    }

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