Macro downcast::impl_downcast[−][src]

macro_rules! impl_downcast {
    (< $($params : ident), + $(,) * > $base : ty $(where $($bounds : tt) +) *) => { ... };
    ($base : ty) => { ... };
}

Expand description

Implements Downcast for your trait-object-type.

impl_downcast!(Foo);
impl_downcast!(<B> Foo<B> where B: Bar);
impl_downcast!(<B> Foo<Bar = B>);

expands to

impl<T> Downcast<T> for Foo
    where T: Any
{}

impl<T, B> Downcast<T> for Foo<B>
    where T: Any, B: Bar
{}

impl<T, B> Downcast<T> for Foo<Bar = B>
    where T: Any
{}