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71 lines
2.7 KiB
71 lines
2.7 KiB
/** |
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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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