Enum Result

Result is an enum that holds either a Failure or Success. This enum is for situations where the function that fails has an error message to deliver. Examples of that include a database query or a more humble rpn calculator.

enum Result[A, B]
{
    Failure(A),
    Success(B)
}

`define failure: Option[A]`

If self contains a Failure, produces a Some(A).

If self contains a Right, produces None.

`define is_failure: Boolean`

Return true if self contains a Failure, false otherwise.

`define is_success: Boolean`

Return true if self contains a Success, false otherwise.

`define success: Option[B]`

If self contains a Failure, produces a None.

If self contains a Success, produces Right(B).