spellcast 0.1.2

Casting of dynamic objects
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28

use super::*;

pub trait TryUpcastRef<To>: Is<To>
where
    To: ?Sized
{
    fn is_of(self: &Self) -> bool;
    fn try_upcast_ref(self: &Self) -> Option<&To>;
    fn try_upcast_mut(self: &mut Self) -> Option<&mut To>;
}
impl<From, To> TryUpcastRef<To> for From
where
    From: Upcast<To> + ?Sized,
    To: ?Sized
{
    fn is_of(self: &Self) -> bool
    {
        true
    }
    fn try_upcast_ref(self: &Self) -> Option<&To>
    {
        Some(self.upcast_ref())
    }
    fn try_upcast_mut(self: &mut Self) -> Option<&mut To>
    {
        Some(self.upcast_mut())
    }
}