Capture property getter/setter

property.swift

public class Property<T> {
  let getter: () -> T
  let setter: T -> ()
  
  public init(_ getter: () -> T, _ setter: T -> ()) {
    self.getter = getter
    self.setter = setter
  }
  
  public var value: T {
    get { return getter() }
    set { setter(newValue) }
  }
}

var x = 0
let property = Property({ x }, { x = $0 })