Struct Callback

#[repr(C)]
pub struct Callback<Arg: ?Sized, Ret = ()> { /* private fields */ }

A Callback that can be connected to a handler.

The Arg represents the argument. It should always be a tuple

Implementations

impl<Arg: ?Sized, Ret: Default> Callback<Arg, Ret>

pub fn call(&self, a: &Arg) -> Ret

Call the callback with the given argument.

pub fn has_handler(&self) -> bool

Return whether a callback is registered or not.

pub fn set_handler(&self, f: impl FnMut(&Arg) -> Ret + 'static)

Set an handler to be called when the callback is called

There can only be one single handler per callback.

Trait Implementations

impl<Arg: ?Sized, Ret> Default for Callback<Arg, Ret>

fn default() -> Self

Returns the “default value” for a type.