Struct UserdataSentinel

pub struct UserdataSentinel<T: 'static>(/* private fields */);

Sentinel for type-erased user data.

This consumes the user data when dropped.

Implementations

impl<T> UserdataSentinel<T>

pub const unsafe fn as_ptr(&self) -> *mut c_void

Gets underlying pointer from sentinel.

This pointer can be passed to Userdata::peek_at() to get the user data. Usually, this is not done directly but through indirection (through the third-party library that required the use of pointers for raw context data in the first place).

Safety

The sentinel remains the owner of the data. Care must be taken to not access the data in any way past the lifetime of the sentinel.

Trait Implementations

impl<T: Debug + 'static> Debug for UserdataSentinel<T>

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<T> Drop for UserdataSentinel<T>

fn drop(&mut self)

Executes the destructor for this type.

impl<T: Send> Send for UserdataSentinel<T>