Struct wayland_client::UserData

pub struct UserData {
    inner: OnceCell<UserDataInner>,
}

A wrapper for user data, able to store any type, and correctly handling access from a wrong thread

Fields

inner: OnceCell<UserDataInner>

Implementations

impl UserData

pub const fn new() -> UserData

Create a new UserData instance

pub fn set<T, F>(&self, f: F)where T: Any + 'static, F: FnOnce() -> T,

Sets the UserData to a given value

The provided closure is called to init the UserData, does nothing is the UserData had already been set.

pub fn set_threadsafe<T, F>(&self, f: F)where T: Any + Send + Sync + 'static, F: FnOnce() -> T,

Sets the UserData to a given threadsafe value

The provided closure is called to init the UserData, does nothing is the UserData had already been set.

pub fn get<T>(&self) -> Option<&T>where T: 'static,

Attempt to access the wrapped user data

Will return None if either:

• The requested type T does not match the type used for construction
• This UserData has been created using the non-threadsafe variant and access is attempted from an other thread than the one it was created on

Trait Implementations

impl Debug for UserData

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

Formats the value using the given formatter.

impl Drop for UserData

fn drop(&mut self)

Executes the destructor for this type.

impl Send for UserData

impl Sync for UserData