walkmc.collections.OpenDoubleRange.kt Maven / Gradle / Ivy

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package walkmc.collections

class OpenDoubleRange(start: Double, endExclusive: Double) {
	private val _start = start
	private val _endExclusive = endExclusive
	val start: Double get() = _start
	val endExclusive: Double get() = _endExclusive
	
	fun lessThanOrEquals(a: Double, b: Double): Boolean = a <= b
	
	operator fun contains(value: Double): Boolean = value >= _start && value < _endExclusive
	fun isEmpty(): Boolean = _start > _endExclusive
	
	override fun equals(other: Any?): Boolean {
		return other is OpenDoubleRange && (isEmpty() && other.isEmpty() ||
			_start == other._start && _endExclusive == other._endExclusive)
	}
	
	override fun hashCode(): Int {
		return if (isEmpty()) -1 else 31 * _start.hashCode() + _endExclusive.hashCode()
	}
	
	override fun toString(): String = "$_start..<$_endExclusive"
}

/**
 * Creates and returns a open range by this double and the specified [end].
 */
infix fun Double.openRange(end: Double) = OpenDoubleRange(this, end)