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

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Resolution-agnostic API for logic solvers

There is a newer version: 1.0.4

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)
}