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• IntegerDivision.kt

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commonMain.it.unibo.tuprolog.solve.stdlib.function.IntegerDivision.kt Maven / Gradle / Ivy

package it.unibo.tuprolog.solve.stdlib.function

import it.unibo.tuprolog.core.Integer
import it.unibo.tuprolog.core.Numeric
import it.unibo.tuprolog.solve.ExecutionContext
import it.unibo.tuprolog.solve.function.IntegersBinaryMathFunction
import org.gciatto.kt.math.BigInteger

/**
 * Implementation of `'//'/2` arithmetic functor
 *
 * @author Enrico
 */
object IntegerDivision : IntegersBinaryMathFunction("//") {
    override fun mathFunction(
        integer1: Integer,
        integer2: Integer,
        context: ExecutionContext,
    ): Numeric =
        // TODO: 25/10/2019 "int_overflow" checks missing (see the standard)
        if (integer2.value.compareTo(BigInteger.ZERO) == 0) {
            throwZeroDivisorError(context)
        } else {
            Numeric.of(integer1.value / integer2.value)
        }
}