Macro downcast_methods

macro_rules! downcast_methods {
    ($($tt:tt)+) => { ... };
}

Generate downcast-methods for your trait-object-type.

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

/* 1st */ impl Foo {
/* 2nd */ impl<B> Foo<B> where B: Bar {
/* 3nd */ impl<B> Foo<Bar = B> {

    pub fn is<T>(&self) -> bool
        where T: Any, Self: Downcast<T>
    { ... }

    pub unsafe fn downcast_ref_unchecked<T>(&self) -> &T
        where T: Any, Self: Downcast<T>
    { ... }

    pub fn downcast_ref<T>(&self) -> Result<&T, TypeMismatch>
        where T: Any, Self: Downcast<T>
    { ... }

    pub unsafe fn downcast_mut_unchecked<T>(&mut self) -> &mut T
        where T: Any, Self: Downcast<T>
    { ... }

    pub fn downcast_mut<T>(&mut self) -> Result<&mut T, TypeMismatch>
        where T: Any, Self: Downcast<T>
    { ... }

    pub unsafe fn downcast_unchecked<T>(self: Box<Self>) -> Box<T>
        where T: Any, Self: Downcast<T>
    { ... }

pub fn downcast<T>(self: Box<Self>) -> Result<Box<T>,
DowncastError<Box<T>>>
        where T: Any, Self: Downcast<T>
    { ... }
}