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Create the NumberRangeBuilder utility class.

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Danila Fedorin 2017-09-20 13:19:55 -07:00
parent ba63dd7874
commit 4c94abb18b
1 changed files with 24 additions and 0 deletions
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core/src/main/kotlin/org/nwapw/abacus/number/NumberRangeBuilder.kt Normal file
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package org.nwapw.abacus.number
import org.nwapw.abacus.Abacus
/**
* A utility class for creating [NumberRange] instances.
*
* Unlike a regular [ClosedRange], a NumberRange must have a third parameter,
* which is the [Abacus] instance that is used for promotion. However, the ".." operator
* is infix, and can only take two parameters. The solution is, instead of returning instances
* of NumberRange directly, to return a builder, which then provides a [with] infix function
* to attach it to an instance of Abacus.
* @property start the beginning of the range.
* @property endInclusive the end of the range.
*/
class NumberRangeBuilder(private val start: NumberInterface, private val endInclusive: NumberInterface) {
/**
* Generate a [NumberRange] with the given instance of [abacus].
* @return a new range with the given instance of Abacus.
*/
infix fun with(abacus: Abacus) = NumberRange(abacus, start, endInclusive)
}