/**
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Copyright 2018 Google Inc. All rights reserved.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at:
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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#import "FBLPromise.h"
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NS_ASSUME_NONNULL_BEGIN
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@interface FBLPromise<Value>(ReduceAdditions)
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typedef id __nullable (^FBLPromiseReducerBlock)(Value __nullable partial, id next)
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NS_SWIFT_UNAVAILABLE("");
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/**
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Sequentially reduces a collection of values to a single promise using a given combining block
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and the value `self` resolves with as initial value.
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@param items An array of values to process in order.
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@param reducer A block to combine an accumulating value and an element of the sequence into
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the new accumulating value or a promise resolved with it, to be used in the next
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call of the `reducer` or returned to the caller.
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@return A new pending promise returned from the last `reducer` invocation.
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Or `self` if `items` is empty.
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*/
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- (FBLPromise *)reduce:(NSArray *)items
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combine:(FBLPromiseReducerBlock)reducer NS_SWIFT_UNAVAILABLE("");
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/**
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Sequentially reduces a collection of values to a single promise using a given combining block
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and the value `self` resolves with as initial value.
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@param queue A queue to dispatch on.
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@param items An array of values to process in order.
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@param reducer A block to combine an accumulating value and an element of the sequence into
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the new accumulating value or a promise resolved with it, to be used in the next
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call of the `reducer` or returned to the caller.
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@return A new pending promise returned from the last `reducer` invocation.
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Or `self` if `items` is empty.
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*/
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- (FBLPromise *)onQueue:(dispatch_queue_t)queue
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reduce:(NSArray *)items
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combine:(FBLPromiseReducerBlock)reducer NS_SWIFT_UNAVAILABLE("");
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@end
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/**
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Convenience dot-syntax wrappers for `FBLPromise` `reduce` operators.
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Usage: promise.reduce(values, ^id(id partial, id next) { ... })
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*/
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@interface FBLPromise<Value>(DotSyntax_ReduceAdditions)
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- (FBLPromise * (^)(NSArray *, FBLPromiseReducerBlock))reduce FBL_PROMISES_DOT_SYNTAX
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NS_SWIFT_UNAVAILABLE("");
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- (FBLPromise * (^)(dispatch_queue_t, NSArray *, FBLPromiseReducerBlock))reduceOn
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FBL_PROMISES_DOT_SYNTAX NS_SWIFT_UNAVAILABLE("");
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@end
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NS_ASSUME_NONNULL_END
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