commonMain.androidx.compose.runtime.ValueHolders.kt Maven / Gradle / Ivy

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/*
 * Copyright 2019 The Android Open Source Project
 *
 * 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 androidx.compose.runtime

/**
 * A StaticValueHolder holds a value that will never change.
 */
internal data class StaticValueHolder(override val value: T) : State

/**
 * A lazy value holder is static value holder for which the value is produced by the valueProducer
 * parameter which is called once and the result is remembered for the life of LazyValueHolder.
 */
internal class LazyValueHolder(valueProducer: () -> T) : State {
    private val current by lazy(valueProducer)

    override val value: T get() = current
}