param server C++ lists

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I'm defining config vectors through the param server using yaml files:

sample: velocity_controller/velocity_max: [0.3, 0.2, 0.2, 0.0, 0.0, 0.5]

If I want to parse these vectors from a python node I use this code:

_velocity_max = array( rospy.get_param("velocity_controller/velocity_max") )

However, in C++, using the ros::param::getCached() I'm only able to parse the following types: string, int, double, bool or XmlRpcValue.

How I can import my values into a std::vector<double> ?

Thank you!