Swift-Frontier-Code07.swift

extension SharedManager {
    public func borrow<A>(_ a: Property<A>,
                          accessBlock: (inout Accessor<A>) -> Void)
    {
        var _a = Accessor(a)
        internalBorrow([a]) {
            accessBlock(&_a)
        }
    }
    public func borrow<A, B>(_ a: Property<A>,
                             _ b: Property<B>,
                             accessBlock: (inout Accessor<A>,
                                           inout Accessor<B>) -> Void)
    {
        var _a = Accessor(a)
        var _b = Accessor(b)
        internalBorrow([a, b]) {
            accessBlock(&_a, &_b)
        }
    }
}