16  Exposing stan code

In some situations it can be useful to make use of the Stan functions brms uses inside the Stan programs it creates. This is for example the case when creating a custom family as described in the vignette on custom response distributions. Whenever defining a custom family, one does provide Stan code snippets to brms which are used to setup the respective Stan model. Since the same functions are then useful for post-proccessing of the model posterior, the created functions can be used in R as well using the expose_functions from brms. Please refer to the vignette on custom families and the help on the expose function utility function ?expose_functions.