pub struct RawWakerVTable { /* private fields */ }Expand description
A virtual function pointer table (vtable) that specifies the behavior
of a RawWaker.
The pointer passed to all functions inside the vtable is the data pointer
from the enclosing RawWaker object.
The functions inside this struct are only intended to be called on the data
pointer of a properly constructed RawWaker object from inside the
RawWaker implementation. Calling one of the contained functions using
any other data pointer will cause undefined behavior.
Note that while this type implements PartialEq, comparing function pointers, and hence
comparing structs like this that contain function pointers, is unreliable: pointers to the same
function can compare inequal (because functions are duplicated in multiple codegen units), and
pointers to different functions can compare equal (since identical functions can be
deduplicated within a codegen unit).
§Thread safety
If the RawWaker will be used to construct a Waker then
these functions must all be thread-safe (even though RawWaker is
!Send + !Sync). This is because