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//! 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::any::type_name;
use std::sync::Arc;
use crate::libs::intertrait::cast::error::CastError;
use crate::libs::intertrait::{get_caster, CastFromSync};
pub trait CastArc
{
/// Casts an `Arc` for this trait into that for type `OtherTrait`.
fn cast<OtherTrait: ?Sized + 'static>(
self: Arc<Self>,
) -> Result<Arc<OtherTrait>, CastError>;
}
/// A blanket implementation of `CastArc` for traits extending `CastFrom`, `Sync`, and
/// `Send`.
impl<CastFromSelf: ?Sized + CastFromSync> CastArc for CastFromSelf
{
fn cast<OtherTrait: ?Sized + 'static>(
self: Arc<Self>,
) -> Result<Arc<OtherTrait>, CastError>
{
let caster = get_caster::<OtherTrait>((*self).type_id()).map_or_else(
|| {
Err(CastError::CastFailed {
from: type_name::<CastFromSelf>(),
to: type_name::<OtherTrait>(),
})
},
Ok,
)?;
match caster.opt_cast_arc {
Some(cast_arc) => Ok(cast_arc(self.arc_any())),
None => Err(CastError::NotArcCastable(type_name::<OtherTrait>())),
}
}
}
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