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• 0.7.0
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• Interfaces.kt

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kotlin.properties.Interfaces.kt Maven / Gradle / Ivy

/*
 * Copyright 2010-2018 JetBrains s.r.o. and Kotlin Programming Language contributors.
 * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
 */

package kotlin.properties

import kotlin.reflect.KProperty

/**
 * Base interface that can be used for implementing property delegates of read-only properties.
 *
 * This is provided only for convenience; you don't have to extend this interface
 * as long as your property delegate has methods with the same signatures.
 *
 * @param R the type of object which owns the delegated property.
 * @param T the type of the property value.
 */
public interface ReadOnlyProperty {
    /**
     * Returns the value of the property for the given object.
     * @param thisRef the object for which the value is requested.
     * @param property the metadata for the property.
     * @return the property value.
     */
    public operator fun getValue(thisRef: R, property: KProperty<*>): T
}

/**
 * Base interface that can be used for implementing property delegates of read-write properties.
 *
 * This is provided only for convenience; you don't have to extend this interface
 * as long as your property delegate has methods with the same signatures.
 *
 * @param R the type of object which owns the delegated property.
 * @param T the type of the property value.
 */
public interface ReadWriteProperty {
    /**
     * Returns the value of the property for the given object.
     * @param thisRef the object for which the value is requested.
     * @param property the metadata for the property.
     * @return the property value.
     */
    public operator fun getValue(thisRef: R, property: KProperty<*>): T

    /**
     * Sets the value of the property for the given object.
     * @param thisRef the object for which the value is requested.
     * @param property the metadata for the property.
     * @param value the value to set.
     */
    public operator fun setValue(thisRef: R, property: KProperty<*>, value: T)
}