test1234

T12345.swift

class packetFactory{
    class func sender<T where T:Constructible, T:Packable>(command:devicePacketHeader.commandType,content:T) -> devicePacketSender<T>?{
        var header:devicePacketHeader
        
        switch (command,content){
        case (.ASK_DEVICE,let TAsk) where TAsk is devicePacketNil:
            header = devicePacketHeader(deviceID: .UNKNOWN, command: command, len:Int16(sizeof(T)))
            
//        case (_,let TNil) where TNil is devicePacketNil:
//            fallthrough
        case (.ASK_VERSION,_),(.RADIO,_),(.READ_PARAMETERS,_),(.DEFAULT_PARAMETER,_) where content is devicePacketNil:
            fallthrough
        case (.SAVE_PARAMETERS, _) where content is devicePacketParameters:
            fallthrough
        case (.UPDATE_PARAMETER, _) where content is devicePacketParameters:
            header = devicePacketHeader(deviceID: .APSM, command: command, len:Int16(sizeof(T)))
            
        default:
            return nil
        }
        
        return devicePacketSender(deviceHeader: header, deviceContent: content)
    }
    
}