Result v0.1.0

Package: Rux

Definition

enum Result<T, E> {
    Success(T),
    Error(E)
}

A Result<T, E> holds either a Success carrying the value T an operation produced, or an Error carrying the failure E. Because the error is part of the return type, a caller cannot read the value without acknowledging that the call might have failed — the usual way is to match on the two variants.

import Core::Result;

match ParseInt64("42") {
    .Success(n) => PrintLine(n),
    .Error(e) => PrintLine("bad input")
}

Result is the recoverable-error half of Rux's error model; for conditions a caller is not expected to recover from, see Panic.

See also

• Core — the package overview
• The Result Type — the language-reference treatment
• match — destructuring Success and Error
• Panic — for unrecoverable errors