kotlin.reflect.KVariance.kt Maven / Gradle / Ivy

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Kotlin Standard Library for JVM

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/*
 * Copyright 2010-2016 JetBrains s.r.o.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package kotlin.reflect

/**
 * Represents variance applied to a type parameter on the declaration site (*declaration-site variance*),
 * or to a type in a projection (*use-site variance*).
 *
 * See the [Kotlin language documentation](https://kotlinlang.org/docs/reference/generics.html#variance)
 * for more information.
 *
 * @see [KTypeParameter.variance]
 * @see [KTypeProjection]
 */
@SinceKotlin("1.1")
enum class KVariance {
    /**
     * The affected type parameter or type is *invariant*, which means it has no variance applied to it.
     */
    INVARIANT,

    /**
     * The affected type parameter or type is *contravariant*. Denoted by the `in` modifier in the source code.
     */
    IN,

    /**
     * The affected type parameter or type is *covariant*. Denoted by the `out` modifier in the source code.
     */
    OUT,
}