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visualization_msgs/Marker contains a points field, which is of type geometry_msgs/Point[]. That is an unbounded array (== list) of geometry_msgs/Points.

Lists in the ROS msg IDL are mapped to std::vectors for C++ (see wiki/msg - Message Description Specification - Array handling).

And std::vector has a push_back(..) method that in this case will take geometry_msgs/Point.

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