chromium/third_party/android_sdk/window_extensions/java/window/extensions/core/core/src/main/java/androidx/window/extensions/core/util/function/Function.java

/*
 * Copyright 2023 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.window.extensions.core.util.function;

/**
 * Represents a function that accepts an argument and produces a result.
 * It is used internally to avoid using Java 8 functional interface that leads to desugaring and
 * Proguard shrinking.
 *
 * @param <T>: the type of the input of the function
 * @param <R>: the type of the output of the function
 *
 * @see java.util.function.Function
 */
@FunctionalInterface
public interface Function<T, R> {
    /**
     * Applies this function to the given argument.
     *
     * @param t the function argument
     * @return the function result
     */
    R apply(T t);
}