Dependency injector

Dependency.swift

import Foundation

@propertyWrapper
struct Injection<T> {
    var wrappedValue: T

    init() {
        self.wrappedValue = DependencyContainer.getDependency()
    }
}

final class DependencyContainer {
    private static var dependencies = [ObjectIdentifier: Any]()

    static func register<T>(_ dependency: T.Type, instance: T) {
        let key = ObjectIdentifier(dependency)
        dependencies[key] = instance as Any
    }
    static func getDependency<T>() -> T {
        let key = ObjectIdentifier(T.self)
        guard let dependency = dependencies[key] as? T else {
            fatalError("No dependency found for \(key)-\(T.self)!")
        }
        return dependency
    }
    static func remove<T>(_ dependency: T.Type) {
        let key = ObjectIdentifier(dependency)
        dependencies.removeValue(forKey: key)
    }
    static func clear() {
        dependencies.removeAll()
    }
}