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Pods/PromisesObjC/Sources/FBLPromises/include/FBLPromise+Reduce.h

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+/**
+ Copyright 2018 Google Inc. All rights reserved.
+
+ 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 "FBLPromise.h"
+
+NS_ASSUME_NONNULL_BEGIN
+
+@interface FBLPromise<Value>(ReduceAdditions)
+
+typedef id __nullable (^FBLPromiseReducerBlock)(Value __nullable partial, id next)
+    NS_SWIFT_UNAVAILABLE("");
+
+/**
+ Sequentially reduces a collection of values to a single promise using a given combining block
+ and the value `self` resolves with as initial value.
+
+ @param items An array of values to process in order.
+ @param reducer A block to combine an accumulating value and an element of the sequence into
+                the new accumulating value or a promise resolved with it, to be used in the next
+                call of the `reducer` or returned to the caller.
+ @return A new pending promise returned from the last `reducer` invocation.
+         Or `self` if `items` is empty.
+ */
+- (FBLPromise *)reduce:(NSArray *)items
+               combine:(FBLPromiseReducerBlock)reducer NS_SWIFT_UNAVAILABLE("");
+
+/**
+ Sequentially reduces a collection of values to a single promise using a given combining block
+ and the value `self` resolves with as initial value.
+
+ @param queue A queue to dispatch on.
+ @param items An array of values to process in order.
+ @param reducer A block to combine an accumulating value and an element of the sequence into
+                the new accumulating value or a promise resolved with it, to be used in the next
+                call of the `reducer` or returned to the caller.
+ @return A new pending promise returned from the last `reducer` invocation.
+         Or `self` if `items` is empty.
+ */
+- (FBLPromise *)onQueue:(dispatch_queue_t)queue
+                 reduce:(NSArray *)items
+                combine:(FBLPromiseReducerBlock)reducer NS_SWIFT_UNAVAILABLE("");
+
+@end
+
+/**
+ Convenience dot-syntax wrappers for `FBLPromise` `reduce` operators.
+ Usage: promise.reduce(values, ^id(id partial, id next) { ... })
+ */
+@interface FBLPromise<Value>(DotSyntax_ReduceAdditions)
+
+- (FBLPromise * (^)(NSArray *, FBLPromiseReducerBlock))reduce FBL_PROMISES_DOT_SYNTAX
+    NS_SWIFT_UNAVAILABLE("");
+- (FBLPromise * (^)(dispatch_queue_t, NSArray *, FBLPromiseReducerBlock))reduceOn
+    FBL_PROMISES_DOT_SYNTAX NS_SWIFT_UNAVAILABLE("");
+
+@end
+
+NS_ASSUME_NONNULL_END