我们可以匹配（）优先级与运算符吗？

Question

我发现了这个有用的子弹：

infix operator • {precedence 255}

/// Used when you'd normally use the dot operator to get a property,
/// but you have to store that operation as a closure for whatever reason.
///
///- Parameter instance: instance on which you'd normally use a dot
///- Parameter property: returns a Property when supplied with an instance
///
///- Returns: the property
///
///- Remark: Hold option, press 8
///
///- Note: Swift's "instance methods" are a lot like this.
///  They're really static methods that take an instance as their first parameter.
func •<Any, Property>(
   instance: Any,
   @noescape property: (of: Any) -> Property
) -> Property {
   return property(of: instance)
}

这是一个用例：

import UIKit

public struct Setting<Value: AnyObject> {
    init(key: String, defaultValue: Value) {
        self.key = key
        NSUserDefaults.standardUserDefaults().registerDefaults(
            [key: defaultValue]
        )
        NSUserDefaults.standardUserDefaults().synchronize()
    }

    private let key: String

    ///- Returns: **value**
    ///- Parameter getter: The method of `NSUserDefaults` that returns a **`Value`**,
    ///  when supplied with a key that is a `String`
    private func value<Value>(
      getter value: NSUserDefaults -> (`for`: String) -> Value
   ) -> Value {
        return (NSUserDefaults.standardUserDefaults()•value)(`for`: key)
    }

   ///- Returns: The setter for **value**
    ///- Parameter setter: The method of `NSUserDefaults` that writes a **`Value`**,
    ///  for a key that is a `String`
    private func value_set<Value>(value: Value,
        setter set: NSUserDefaults -> (Value, `for`: String) -> ()
    ) {
        (NSUserDefaults.standardUserDefaults()•set)(value, `for`: self.key)
    }
}

extension Setting where Value: BooleanLiteralConvertible {
    var value: Bool {
        get {return value(getter: NSUserDefaults.boolForKey)}
        set {value_set(newValue, setter: NSUserDefaults.setBool)}
    }
}

extension Setting where Value: IntegerLiteralConvertible {
    var value: Int {
        get {return value(getter: NSUserDefaults.integerForKey)}
        set {value_set(newValue, setter: NSUserDefaults.setInteger)}
    }
}

看看我需要多多括号？我想要这个：

return NSUserDefaults.standardUserDefaults()•value(`for`: key)
NSUserDefaults.standardUserDefaults()•set(value, `for`: self.key)