[−][src]Trait better_any::TidExt

pub trait TidExt<'a> {
    fn is<T: Tid<'a>>(&self) -> bool;

    fn downcast_ref<'b, T: Tid<'a>>(&'b self) -> Option<&'b T>;

    fn downcast_mut<'b, T: Tid<'a>>(&'b mut self) -> Option<&'b mut T>;

    fn downcast_rc<T: Tid<'a>>(self: Rc<Self>) -> Result<Rc<T>, Rc<Self>>;

    fn downcast_arc<T: Tid<'a>>(self: Arc<Self>) -> Result<Arc<T>, Arc<Self>>;

    fn downcast_box<T: Tid<'a>>(self: Box<Self>) -> Result<Box<T>, Box<Self>>;
}

Extension trait that contains actual downcasting methods.

Use methods from this trait only if dyn Tid was created directly from T for this particular T

Required methods

fn is<T: Tid<'a>>(&self) -> bool

Returns true if type behind self is equal to the type of T.

fn downcast_ref<'b, T: Tid<'a>>(&'b self) -> Option<&'b T>

Attempts to downcast self to T behind reference

fn downcast_mut<'b, T: Tid<'a>>(&'b mut self) -> Option<&'b mut T>

Attempts to downcast self to T behind mutable reference

fn downcast_rc<T: Tid<'a>>(self: Rc<Self>) -> Result<Rc<T>, Rc<Self>>

Attempts to downcast self to T behind Rc pointer

fn downcast_arc<T: Tid<'a>>(self: Arc<Self>) -> Result<Arc<T>, Arc<Self>>

Attempts to downcast self to T behind Arc pointer

fn downcast_box<T: Tid<'a>>(self: Box<Self>) -> Result<Box<T>, Box<Self>>

Attempts to downcast self to T behind Box pointer

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Implementors

impl<'a, X: ?Sized + Tid<'a>> TidExt<'a> for X[src]

If X is Sized then any of those calls is optimized to no-op because both T and Self are known statically. Useful if you have generic code that you want to behave differently depending on which concrete type replaces type parameter. Usually there are better ways to do this like specialization, but sometimes it can be the only way.

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