Macro simple_error

macro_rules! simple_error {
    (
        $(#[$meta: meta])*
        $vis: vis $name: ident {
            $(
                $(#[$field_meta: meta])*
                $((impl $e: ident))? $ty: ident $(($data: ty))? => $desc: literal
            ),*
        }
    ) => { ... };
}

Available on crate feature simple-error only.

Generates a simple enum which maps multiple error types and implements Error and Display automatically. This optionally can generate From implementations on demand.

Example

use bp3d_util::simple_error;
simple_error!(
    /// Doc.
    TestError {
        /// This is a doc comment which is recorded by the macro.
        Untyped => "untyped variant",
        /// Another doc comment.
        (impl From) Io(std::io::Error) => "io error {}",
        Other(u8) => "other u8 error {}"
    }
);
println!("{}", TestError::Untyped);