Function pin_init_from_closure

pub const unsafe fn pin_init_from_closure<T: ?Sized, E>(
    f: impl FnOnce(*mut T) -> Result<(), E>,
) -> impl PinInit<T, E>

Creates a new PinInit<T, E> from the given closure.

Safety

The closure:

• returns Ok(()) if it initialized every field of slot,
• returns Err(err) if it encountered an error and then cleaned slot, this means:
  • slot can be deallocated without UB occurring,
  • slot does not need to be dropped,
  • slot is not partially initialized.
• may assume that the slot does not move if T: !Unpin,
• while constructing the T at slot it upholds the pinning invariants of T.