Trait glib::object::Downcast[−][src]

pub trait Downcast<T> {
    fn can_downcast(&self) -> bool;
    fn downcast(self) -> Result<T, Self>
    where
        Self: Sized;
    fn downcast_ref(&self) -> Option<&T>;
    unsafe fn downcast_unchecked(self) -> T;
    unsafe fn downcast_ref_unchecked(&self) -> &T;
}

Downcasts support.

Required Methods

`fn can_downcast(&self) -> bool`

Checks if it's possible to downcast to T.

Returns true if the instance implements T and false otherwise.

`fn downcast(self) -> Result<T, Self> where Self: Sized,`

Tries to downcast to T.

Returns Ok(T) if the instance implements T and Err(Self) otherwise.

`fn downcast_ref(&self) -> Option<&T>`

Tries to downcast to &T.

Returns Some(T) if the instance implements T and None otherwise.

`unsafe fn downcast_unchecked(self) -> T`

Downcasts to T unconditionally.

Panics if compiled with debug_assertions and the instance doesn't implement T.

Important traits for &'a mut R

impl<'a, R> Read for &'a mut R where
    R: Read + ?Sized, impl<'a, W> Write for &'a mut W where
    W: Write + ?Sized, impl<'a, I> Iterator for &'a mut I where
    I: Iterator + ?Sized,     type Item = <I as Iterator>::Item;

`unsafe fn downcast_ref_unchecked(&self) -> &T`

Downcasts to &T unconditionally.

Panics if compiled with debug_assertions and the instance doesn't implement T.

Implementors

impl<Super: IsA<Super>, Sub: IsA<Super>> Downcast<Sub> for Super
[src]