sample_u()

template<typename D , typename RNG , template< typename > class Policy, typename I , typename... Ts>

DSType<D> sample_u	(	record_t< DTypes< Ts... >> &	r,
		std::string	address,
		typed_map< Policy, I, Ts... > &	map_,
		RNG &	rng
	)

Sample a value from the addressed distribution in the typed_map

For example,

auto loc = sample_u<Normal>(r, "loc", input, rng);

corresponds to the semantics "sample the value for "loc" from the distribution contained in the map; my prior belief is that that distribution is Normal".