refactor: add back Intertrait tests & Rc support

1 files changed, 32 insertions, 0 deletions

diff --git a/src/libs/intertrait/cast/arc.rs b/src/libs/intertrait/cast/arc.rs
new file mode 100644
index 0000000..4099ae7
--- /dev/null
+++ b/src/libs/intertrait/cast/arc.rs
@@ -0,0 +1,32 @@
+//! Originally from Intertrait by CodeChain
+//!
+//! <https://github.com/CodeChain-io/intertrait>
+//! <https://crates.io/crates/intertrait/0.2.2>
+//!
+//! Licensed under either of
+//!
+//! Apache License, Version 2.0 (LICENSE-APACHE or <http://www.apache.org/licenses/LICENSE-2.0>)
+//! MIT license (LICENSE-MIT or <http://opensource.org/licenses/MIT>)
+//!
+//! at your option.
+use std::sync::Arc;
+
+use crate::libs::intertrait::{caster, CastFromSync};
+
+pub trait CastArc
+{
+    /// Casts an `Arc` for this trait into that for type `T`.
+    fn cast<T: ?Sized + 'static>(self: Arc<Self>) -> Result<Arc<T>, Arc<Self>>;
+}
+
+/// A blanket implementation of `CastArc` for traits extending `CastFrom`, `Sync`, and `Send`.
+impl<S: ?Sized + CastFromSync> CastArc for S
+{
+    fn cast<T: ?Sized + 'static>(self: Arc<Self>) -> Result<Arc<T>, Arc<Self>>
+    {
+        match caster::<T>((*self).type_id()) {
+            Some(caster) => Ok((caster.cast_arc)(self.arc_any())),
+            None => Err(self),
+        }
+    }
+}