1 /*
2  * Copyright (C) 2017 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 package com.android.internal.util.function.pooled;
18 
19 /**
20  * A placeholder for an argument of type {@code R}
21  *
22  * @see PooledLambda
23  * @hide
24  */
25 public final class ArgumentPlaceholder<R> {
ArgumentPlaceholder()26     private ArgumentPlaceholder() {}
27     static final ArgumentPlaceholder<?> INSTANCE = new ArgumentPlaceholder<>();
28 
29     @Override
toString()30     public String toString() {
31         return "_";
32     }
33 }
34