Function vtkWriteDataArray

IO/Legacy/vtkDataWriter.cxx:1006–1057

// We could change the format into C++ io standard ...
template <class T>
void vtkWriteDataArray(
  ostream* fp, T* data, int fileType, const char* format, vtkIdType num, vtkIdType numComp)
{
  vtkIdType i, j, idx, sizeT;
  char str[1024];

  sizeT = sizeof(T);

  if (fileType == VTK_ASCII)
  {
    for (j = 0; j < num; j++)
    {
      for (i = 0; i < numComp; i++)
      {
        idx = i + j * numComp;
        auto result = vtk::format_to_n(str, sizeof(str), format, *data++);
        *result.out = '\0';
        *fp << str;
        if (!((idx + 1) % 9))
        {
          *fp << "\n";
        }
      }
    }
  }
  else
  {
    if (num * numComp > 0)
    {
      // need to byteswap ??
      switch (sizeT)
      {
        case 2:
          // no typecast needed here; method call takes void* data
          vtkByteSwap::SwapWrite2BERange(data, num * numComp, fp);
          break;
        case 4:
          // no typecast needed here; method call takes void* data
          vtkByteSwap::SwapWrite4BERange(data, num * numComp, fp);
          break;
        case 8:
          // no typecast needed here; method call takes void* data
          vtkByteSwap::SwapWrite8BERange(data, num * numComp, fp);
          break;
        default:
          fp->write(reinterpret_cast<char*>(data), sizeof(T) * (num * numComp));
          break;
      }
    }
  }
  *fp << "\n";
}

//------------------------------------------------------------------------------
template <class Value, class Array>