swift – 如何列出对象符合的协议？

let obj = NSObject()

var pc: UInt32 = 0
let plist = class_copyProtocolList(object_getClass(obj),&pc)

print("(obj.dynamicType) conforms to (pc) protocols")

for i in 0 ..< Int(pc) {
    print(String(format: "Protocol #%d: %s",arguments: [i,protocol_getName(plist[i])]))
}

或者运行时加载的所有Objective-C协议：

var allProtocolCount: UInt32 = 0

let protocols = objc_copyProtocolList(&allProtocolCount)

print("(allProtocolCount) total protocols")

for i in 0 ..< Int(allProtocolCount) {
    print(String(format: "Protocol #%d: %s",protocol_getName(protocols[i])]))
}

但这些都没有列出任何Swift协议：

func == (lhs: MyClass,rhs: MyClass) -> Bool {
    return lhs.value == rhs.value
}

class MyClass: Equatable,Hashable {

    var value: Int
    var hashValue: Int {
        return value
    }

    init(value: Int) {
        self.value = value
    }
}

var count: UInt32 = 0;

let strProtocols = class_copyProtocolList(MyClass.self,&count) // 0x0000000000000000

strProtocols是0,当我希望它返回sizeof(协议)* 2(因为MyClass符合Equatable和Hashable).

是否有运行时公开的接口来获取对象符合的协议列表？