Logger sample to explain how to use @PropertyWarpper

PropertyLogger.swift

//
//  User.swift
//  TestAspect
//
//  Created by Daniel Vela on 12/01/2020.
//  Copyright © 2020 veladan. All rights reserved.
//

@propertyWrapper
struct Logger<Value> {
  var innerValue: Value
  var variableName: String

  init(_ initialValue: Value, _ variableName: String) {
    self.innerValue = initialValue;
    self.variableName = variableName;
  }

  var value: Value {
    get {
      print("Getting the \(self.variableName) value of \(self.innerValue)")
      return self.innerValue
    }
    set {
      print("Will set the initial \(self.variableName) value to \(newValue)")
      self.innerValue = newValue
      print("Has set the \(self.variableName) value to \(self.innerValue)")
    }
  }
}

struct User {
  @Logger("", "User.name")
  var name: String
}

func run() {
  var u = User()
  u.name = "Daniel Vela"
}