[pdal] How to add filters (with C++ API)

[Odd Ragnar Lydersen]

I'm writing code to add filters when reading las files.
All examples are in json format, and I'm wondering what is the best way to do this in C++.

I've been looking at the tests from the source code, to get examples, but I can't find any that combine different kinds of filters.

Code example (Semi Pseudo):

if (useFilters)
  {
    bool filterInputIsSet = false;

    LasReader filterReader;
    prepareLasReader(filterReader, fileName);

   if (useCropFilter)
    {
      cropOptions.add("bounds", someBounds);

      if (!filterInputIsSet)
      {
        crpFilter.setInput(filterReader);
        filterInputIsSet = true;
      }
      cropFilter.addOptions(cropOptions);
    }

    if (useClassFilter)
    {
      std::string classFilterString;
      for (int i=0; i <= ClassificationType::eOverlapPoints; i++)
      {
        addClassToString(classFilterString);
      }
      rangeOptions.add("limits", classFilterString);

      if (!filterInputIsSet) // Only rangeFilter is used
      {
        rangeFilter.setInput(filterReader);
        filterInputIsSet = true;
      }
      else // Both filters are used
      {
        rngFilter.setInput(cropFilter);
      }

      rangeFilter.setOptions(rangeOptions);
      rangeFilter.prepare(table);
      point_view_set = rangeFilter.execute(table);
      point_view = *point_view_set.begin();
    }
    else // Only cropFilter is used
    {
      cropFilter.prepare(table);
      point_view_set = cropFilter.execute(table);
      point_view = *point_view_set.begin();
    }
 }
  else // No filters are used
  {
    LasReader.prepare(table);
    point_view_set = LasReader.execute(table);
    point_view = *point_view_set.begin();
  }

Is there a better, and more elegant way to do this?

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