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Pods/PromisesSwift/Sources/Promises/Promise+Await.swift

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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 FBLPromises
+
+/// Waits for promise resolution. The current thread blocks until the promise is resolved.
+/// - parameters:
+///   - promise: Promise to wait for.
+/// - throws: Error the promise was rejected with.
+/// - returns: Value the promise was fulfilled with.
+public func awaitPromise<Value>(_ promise: Promise<Value>) throws -> Value {
+  var outError: NSError?
+  let outValue = __FBLPromiseAwait(promise.objCPromise, &outError) as AnyObject
+  if let error = outError { throw error }
+  guard let value = Promise<Value>.asValue(outValue) else { preconditionFailure() }
+  return value
+}