Type Definition libffi::low::Callback

type Callback<U, R> = unsafe extern "C" fn(cif: &ffi_cif, result: &mut R, args: *const *const c_void, userdata: &U);

The type of function called by a closure.

U is the type of the user data captured by the closure and passed to the callback, and R is the type of the result. The parameters are not typed, since they are passed as a C array of void*.