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In C++ ROS messages, variable-sized arrays are implemented as a std::vector, which start with a size of 0. You're probably getting a segmentation fault because you're trying to use an array index that is out of bounds.

You should probably call resize() to set the size of the points array:

destination.points.resize(1);

If you're interested in learning more about the std::vector, my favorite reference is http://www.cplusplus.com/reference/vector/vector/