How to use RS2_OPTION_ENABLE_MAPPING in librealsense2

[PRODI1]

Hi there, I'm new to realsense T265. I'm looking around examples source code, but I didn't find a way to set RS2_OPTION_ENABLE MAP_PRESERVATION. I would like to set to true as if I'm using realsense-viewer before starting stream.

Thank's very much

[MAURICIOAL_R_Intel]

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Regards, 

Mauricio R.