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@file:kotlin.jvm.JvmMultifileClass
@file:kotlin.jvm.JvmName("RangesKt")
package kotlin.ranges

/**
 * Represents a range of [Comparable] values.
 */
private class ComparableRange> (
        override val start: T,
        override val endInclusive: T
): ClosedRange {

    override fun equals(other: Any?): Boolean {
        return other is ComparableRange<*> && (isEmpty() && other.isEmpty() ||
                start == other.start && endInclusive == other.endInclusive)
    }

    override fun hashCode(): Int {
        return if (isEmpty()) -1 else 31 * start.hashCode() + endInclusive.hashCode()
    }

    override fun toString(): String = "$start..$endInclusive"
}

/**
 * Creates a range from this [Comparable] value to the specified [that] value. This value
 * needs to be smaller than [that] value, otherwise the returned range will be empty.
 */
public operator fun > T.rangeTo(that: T): ClosedRange = ComparableRange(this, that)


internal fun checkStepIsPositive(isPositive: Boolean, step: Number) {
    if (!isPositive) throw IllegalArgumentException("Step must be positive, was: $step.")
}