Boost random::discrete_distribution How to change weights once constructed?

Question

Ok, it is possible to give weights/probabilities in boost::random::discrete_distribution.

e.g.

double probabilities[] = { 0.5, 0.1, 0.1, 0.1, 0.1, 0.1 };

boost::random::discrete_distribution<> dist(probabilities);

Question: Once the object dist is constructed

(1)How to change one of the weights e.g. 0.5 to 0.3?

(2) How to reassign all the weights at once?