/*
 * Copyright 2019 Google
 *
 * 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.
 */

#import <Foundation/Foundation.h>

NS_ASSUME_NONNULL_BEGIN

/**
 * A generic class to combine several handler blocks into a single block in a thread-safe manner
 */
@interface FIRInstanceIDCombinedHandler<ResultType> : NSObject

- (void)addHandler:(void (^)(ResultType _Nullable result, NSError* _Nullable error))handler;
- (void (^)(ResultType _Nullable result, NSError* _Nullable error))combinedHandler;

@end

NS_ASSUME_NONNULL_END