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//
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2021-07-05 15:28:14 +00:00
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// Copyright 2021 New Vector Ltd
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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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//
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import Foundation
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2021-09-13 10:36:33 +00:00
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/// A property wrapped used to inject from the dependency container on the instance, to instance properties.
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///
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/// ```
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/// @Inject var someClass: SomeClass
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/// ```
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@propertyWrapper struct Inject<Value> {
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static subscript<T: Injectable>(_enclosingInstance instance: T,
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wrapped wrappedKeyPath: ReferenceWritableKeyPath<T, Value>,
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storage storageKeyPath: ReferenceWritableKeyPath<T, Self>) -> Value {
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get {
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// Resolve dependencies from enclosing instance's `dependencies` property
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let v: Value = instance.dependencies.resolve()
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return v
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}
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set {
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fatalError("Only subscript get is supported for injection")
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}
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}
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@available(*, unavailable, message: "This property wrapper can only be applied to classes")
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var wrappedValue: Value {
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get { fatalError("wrappedValue get not used") }
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set { fatalError("wrappedValue set not used. \(newValue)") }
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}
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}
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