pub type CapturedError = Box<dyn Error + Send + Sync>;Expand description
A thread-safe dyn error.
Returning it as an error allows a function to gloss over actual error types. While not usually desirable, it’s a simple or even necessary solution for generic code in which internal error types are not and cannot be known at compile time.
For generic returned errors it can be useful to specify Into<CapturedError> as a bound.
(Rust doesn’t support trait aliases, so you have to spell it out.) This allows for implicit
error conversion, e.g. using the ? operator.
Boxing errors is mentioned in Rust by Example, though the example there is not thread-safe.
Other implementations add thread-safety, e.g. BoxError in Tower HTTP, which is the inspiration for this.
A far more comprehensive solution is provided by anyhow.
Aliased Type§
struct CapturedError(/* private fields */);