Module foreigncallbacks

This module contains code to handle foreign callbacks - C-ABI functions that are defined by a foreign language, then registered with UniFFI. These callbacks are used to implement callback interfaces, async scheduling etc. Foreign callbacks are registered at startup, when the foreign code loads the exported library. For each callback type, we also define a “cell” type for storing the callback.

Type Aliases

• ForeignCallback
  ForeignCallback is the Rust representation of a foreign language function. It is the basis for all callbacks interfaces. It is registered exactly once per callback interface, at library start up time. Calling this method is only done by generated objects which mirror callback interfaces objects in the foreign language.
• ForeignExecutorCallback
  Callback to schedule a Rust call with a ForeignExecutor. The bindings code registers exactly one of these with the Rust code.