29 lines
1.2 KiB
Swift
29 lines
1.2 KiB
Swift
// Copyright 2018 Google Inc. All rights reserved.
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//
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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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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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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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import FBLPromises
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/// Waits for promise resolution. The current thread blocks until the promise is resolved.
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/// - parameters:
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/// - promise: Promise to wait for.
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/// - throws: Error the promise was rejected with.
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/// - returns: Value the promise was fulfilled with.
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public func awaitPromise<Value>(_ promise: Promise<Value>) throws -> Value {
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var outError: NSError?
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let outValue = __FBLPromiseAwait(promise.objCPromise, &outError) as AnyObject
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if let error = outError { throw error }
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guard let value = Promise<Value>.asValue(outValue) else { preconditionFailure() }
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return value
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}
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