vim_rs/types/
convert.rs

1use std::any;
2/// Casts one trait to another. For example:
3///
4/// Example: `let virtual_device = <dyn VirtualDeviceTrait>::from_ref(data_object_trait_ref)?`;
5pub trait CastFrom<From: ?Sized> {
6    /// Casts a reference to a trait object. If the cast fails, [`std::option::Option::None`] is
7    /// returned.
8    fn from_ref<'a>(from: &'a From) -> Option<&'a Self>;
9    /// Casts a boxed trait object to another trait object. If the cast fails, the original boxed 
10    /// trait object is returned in [`std::result::Result::Err`].
11    fn from_box(from: Box<From>) -> Result<Box<Self>, Box<dyn any::Any>>;
12}
13
14/// Casts one trait to another. For example:
15///
16/// Example: `let virtual_device: &dyn VirtualDeviceTrait = data_object_trait_ref.into_ref()?`; 
17pub trait CastInto<To: ?Sized> {
18    /// Casts a reference to a trait object. If the cast fails, [`std::option::Option::None`] is
19    /// returned.
20    fn into_ref<'a>(&'a self) -> Option<&'a To>;
21    /// Casts a boxed trait object to another trait object. If the cast fails, the original boxed
22    /// trait object is returned in [`std::result::Result::Err`].
23    fn into_box(self: Box<Self>) -> Result<Box<To>, Box<dyn any::Any>>;
24}
25
26impl<To: CastFrom<T> + ?Sized, T: ?Sized + 'static> CastInto<To> for T {
27    fn into_ref<'a>(&'a self) -> Option<&'a To> {
28        CastFrom::from_ref(self)
29    }
30
31    fn into_box(self: Box<Self>) -> Result<Box<To>, Box<dyn any::Any + 'static>> {
32        CastFrom::from_box(self)
33    }
34}
35
vim_rs/types/convert.rs

vim_rs/types/
convert.rs
