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use crate::{fill::Slot, std::error, ValueBag};
use super::{cast, Internal};
impl<'v> ValueBag<'v> {
pub fn capture_error<T>(value: &'v T) -> Self
where
T: error::Error + 'static,
{
ValueBag {
inner: Internal::Error {
value,
type_id: cast::type_id::<T>(),
},
}
}
pub fn from_dyn_error(value: &'v (dyn error::Error + 'static)) -> Self {
ValueBag {
inner: Internal::AnonError { value },
}
}
pub fn to_borrowed_error(&self) -> Option<&(dyn Error + 'static)> {
match self.inner {
Internal::Error { value, .. } => Some(value),
Internal::AnonError { value } => Some(value),
_ => None,
}
}
}
impl<'s, 'f> Slot<'s, 'f> {
pub fn fill_error<T>(&mut self, value: T) -> Result<(), crate::Error>
where
T: error::Error + 'static,
{
self.fill(|visitor| visitor.error(&value))
}
pub fn fill_dyn_error(
&mut self,
value: &(dyn error::Error + 'static),
) -> Result<(), crate::Error> {
self.fill(|visitor| visitor.error(value))
}
}
pub use self::error::Error;
#[cfg(test)]
mod tests {
#[cfg(target_arch = "wasm32")]
use wasm_bindgen_test::*;
use super::*;
use crate::{
std::{io, string::ToString},
test::*,
};
#[test]
#[cfg_attr(target_arch = "wasm32", wasm_bindgen_test)]
fn error_capture() {
let err = io::Error::from(io::ErrorKind::Other);
assert_eq!(
err.to_string(),
ValueBag::capture_error(&err)
.to_borrowed_error()
.expect("invalid value")
.to_string()
);
assert_eq!(
err.to_string(),
ValueBag::from_dyn_error(&err)
.to_borrowed_error()
.expect("invalid value")
.to_string()
);
}
#[test]
#[cfg_attr(target_arch = "wasm32", wasm_bindgen_test)]
fn error_downcast() {
let err = io::Error::from(io::ErrorKind::Other);
assert!(ValueBag::capture_error(&err)
.downcast_ref::<io::Error>()
.is_some());
}
#[test]
#[cfg_attr(target_arch = "wasm32", wasm_bindgen_test)]
fn error_visit() {
let err = io::Error::from(io::ErrorKind::Other);
ValueBag::from_dyn_error(&err)
.visit(TestVisit)
.expect("failed to visit value");
}
}