2 * Copyright 2018 Google
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
8 * http://www.apache.org/licenses/LICENSE-2.0
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.
17 #import <Foundation/Foundation.h>
19 @class FIRComponentContainer;
21 NS_ASSUME_NONNULL_BEGIN
23 /// Do not use directly. A placeholder type in order to provide a macro that will warn users of
24 /// mis-matched protocols.
25 NS_SWIFT_NAME(ComponentType)
26 @interface FIRComponentType<__covariant T> : NSObject
28 /// Do not use directly. A factory method to retrieve an instance that provides a specific
30 + (T)instanceForProtocol:(Protocol *)protocol inContainer:(FIRComponentContainer *)container;