FortranShape()

aff::util::FortranShape::FortranShape ( const Tshape &  shape, const bool &  BaseOne = true  )

explicit

construct from shape

all calculations are done herein

Definition at line 44 of file fortranshape.cc.

References AFF_assert, aff::Strided::first(), aff::Strided::first_offset(), aff::Strided::last(), Mdimlast, Mfirst, Mlast, aff::Strided::Mmax_dimen, Moffset, aff::Strided::setfirst(), and aff::Strided::stride().

  {
    // create a local copy of the shape
    Tshape shape(inshape);
    // set first index as required
    if (BaseOne) shape.setfirst(TIndexVec(1));
    // extract first and last index
    Mfirst=shape.first();
    Mlast=shape.last();
    // extract offset to first element
    Moffset=shape.first_offset();
    // first test for Fortran memory layout
    for (Tdim i=1; i<Tshape::Mmax_dimen; i++)
    {
      AFF_assert((shape.stride(i-1)<=shape.stride(i)),
                 "ERROR (FortranShape): no Fortran layout!");
    }
    // native Fortran arrays have stride 1 in base dimension
    // In case we ever want to pass a slice, we have to think about how to
    // pass strides to the Fortran subroutine
    AFF_assert((shape.stride(0)==1),
               "ERROR (FortranShape): No native Fortran array layout!");
    // We assume that every properly sliced array has strides that are integer
    // multiples of the stride of the lower dimension. Just for safety, we
    // test for that assumption.
    for (Tdim i=1; i<Tshape::Mmax_dimen; i++)
    {
      Tsize mult=shape.stride(i)/shape.stride(i-1);
      AFF_assert((shape.stride(i)==(mult*shape.stride(i-1))),
                 "ERROR (FortranShape): Stride is no integer multiple!");
    }
    // calculate dimensioned last
    for (Tdim i=1; i<Tshape::Mmax_dimen; i++)
    {
      Mdimlast[i-1]=shape.stride(i)/shape.stride(i-1)+Mfirst[i-1]-1;
    }
    Mdimlast[Tshape::Mmax_dimen-1]=Mlast[Tshape::Mmax_dimen-1];
    // check bounds (just in case...)
    for (Tdim i=0; i<Tshape::Mmax_dimen; i++)
    {
      AFF_assert((Mlast[i]<=Mdimlast[i]),
                 "ERROR (FortranShape): illegal index range in shape!");
    }
    // that's it...
  }

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