Converting costom struct to Data in Swift3

struct2data.swift

import Foundation
do {
struct Token {
    var dict: [String: Any]? = nil
    init(dictionary: [String: Any]) {
        self.dict = dictionary
    }

    func data() -> Data {
        let pointer = UnsafeMutablePointer<Token>.allocate(capacity: 1)
        pointer.initialize(to: self, count: 1)
        let bufferPointer = UnsafeBufferPointer(start: pointer, count: 1)
        let data = Data(buffer: bufferPointer)
        pointer.deallocate(capacity: 1)
        return data
    }
}

class Manager {
    func save(token: Token) {
        let data = token.data()
        try! data.write(to: self.saveFilePath)
    }

    func loadToken() -> Token {
        let data = try! Data(contentsOf: self.saveFilePath)
        return data.withUnsafeBytes { (pointer: UnsafePointer<Token>) -> (Token) in
            return pointer.pointee
        }
    }

    var saveFilePath: URL {
        let cacheDir = FileManager.default.urls(for: .cachesDirectory, in: .userDomainMask).first!
        let saveDir = cacheDir.appendingPathComponent("tokens", isDirectory: true)
        if FileManager.default.fileExists(atPath: saveDir.path) == false {
            try! FileManager.default.createDirectory(at: saveDir, withIntermediateDirectories: false)
        }
        return saveDir.appendingPathComponent("temp.token")
    }

}

class Main {
    func saveTest() {
        let token = Token(dictionary: ["name": "yoshimoto", "age": 34])
        let manager = Manager()
        manager.save(token: token)
    }
    func loadTest() -> Token {
        let manager = Manager()
        let token = manager.loadToken()
        return token
    }

    func test() {
        self.saveTest()
        let token = self.loadTest()
        print(token.dict!)
        print(token.dict!["name"]!)
    }
}

let main = Main()
main.test()
}