Expand description
AppErr is a wrapper object intended to hold application-specific errors.
The archetypal use-case is to allow applications that call library runtimes which call application callbacks to allow the application callbacks to return application-specific errors back to itself through the runtime.
In order to lessen the risk of wrapping an unintended type, the AppErr
constructor only take in types that implement apperr::Blessed
(which is a subtrait of std::error::Error).
Alternatives
There are other ways to solve the same problem, but they are not always feasible.
- Traits can use associated types to declare the application-specific error types.
- A generic parameter can be used to declare the application-specific error type.
- Global variables can be used to store error information.
Structs
- An error type used to pass an application-specific error through a library runtime.
Traits
- Marker trait used to bless a type so that it can be used as a application-specific error.