我有以下代码:structMyStruct{varv:Int=1}funccreateInstance(type:T.Type)->T{returntype.init()}letmyType=MyStruct.selfletinstance=createInstance(type:myType)这行不通，因为我不保证T有一个init。Playgroundexecutionfailed:error:MyPlayground.playground:76:12:error:type'T'hasnomember'init'returntype.init()^~~~~~~~但是我怎样才能定义一个