RangeLikelihood getters lack const qualifier

[SergioRAgostinho]

All the get methods need a const qualifier.
https://github.com/PointCloudLibrary/pcl/blob/master/simulation/include/pcl/simulation/range_likelihood.h

[JamesGiller]

I'm working on this issue.

FYI there are four get methods that shouldn't take a const qualifier:
getColorBuffer, getDepthBuffer, and getScoreBuffer because they set member variables depth_buffer_dirty_, color_buffer_dirty_, score_buffer_dirty_ respectively.
getPointCloud because it calls getColorBuffer.

[SergioRAgostinho]

No problem. Just apply it to the ones you can. Thanks.

[taketwo]

If these member fields are for caching only and do not belong to the observable object state, then they can be marked as mutable and be modified in const-qualified methods. But I am not familiar with the code base, so you need to use your own judging of whether this is appropriate or not.

[SergioRAgostinho]

It's as you pointed out. They are used as a caching mechanism and they have no getters, making them not observable from the outside.