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There is a newer version: 0.7.0

package com.copperleaf.json.utils

public sealed class Either {
    public data class Left(val value: LeftT) : Either()
    public data class Right(val value: RightT) : Either()
}

// Creation functions
// ---------------------------------------------------------------------------------------------------------------------

public fun  L.asLeft(): Either {
    return Either.Left(this)
}

public fun  R.asRight(): Either {
    return Either.Right(this)
}

public inline fun  Any.asEither(): Either {
    return if (this is L) {
        this.asLeft()
    } else if (this is R) {
        this.asRight()
    } else {
        error("$this is neither ${L::class.simpleName} nor ${R::class.simpleName}")
    }
}

// Access values
// ---------------------------------------------------------------------------------------------------------------------

public fun  Either.requireLeftValue(): L {
    return (this as Either.Left).value
}

public val  Either.leftValue: L?
    get() {
        return (this as? Either.Left)?.value
    }

public fun  Either.requireRightValue(): R {
    return (this as Either.Right).value
}

public val  Either.rightValue: R?
    get() {
        return (this as? Either.Right)?.value
    }