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• 0.30.0
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• SignReversal.kt

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commonMain.it.unibo.tuprolog.solve.stdlib.function.SignReversal.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.core.Real
import it.unibo.tuprolog.solve.ExecutionContext
import it.unibo.tuprolog.solve.function.UnaryMathFunction

/**
 * Implementation of `'-'/1` arithmetic functor
 *
 * @author Enrico
 */
object SignReversal : UnaryMathFunction("-") {

    override fun mathFunction(integer: Integer, context: ExecutionContext): Numeric =
        // TODO: 25/10/2019 "int_overflow" check missing (see the standard)
        Integer.of(-integer.value)

    override fun mathFunction(real: Real, context: ExecutionContext): Numeric =
        Real.of(-real.value)
}