The problem is that you’re making a promise that the compiler can’t prove you’ll keep. So you created this promise: Calling copy() will return its own type, fully initialized. But then you implemented copy() this way: func copy() -> Self { return C() } Now I’m a subclass that doesn’t override copy(). And I return … Read more
To sum up everything I read here and the solution which worked for me: struct ContainerView<Content: View>: View { @ViewBuilder var content: Content var body: some View { content } } This not only allows you to put simple Views inside, but also, thanks to @ViewBuilder, use if-else and switch-case blocks: struct SimpleView: View { … Read more
TCP almost always uses SOCK_STREAM and UDP uses SOCK_DGRAM. TCP (SOCK_STREAM) is a connection-based protocol. The connection is established and the two parties have a conversation until the connection is terminated by one of the parties or by a network error. UDP (SOCK_DGRAM) is a datagram-based protocol. You send one datagram and get one reply … Read more
Swift >= 4: protocol A : AnyObject { … { Swift < 4: protocol A : class { … } defines a “class-only protocol”: Only class types (and not structures or enumerations) can adopt this protocol. Weak references are only defined for reference types. Classes are reference types, structures and enumerations are value types. (Closures … Read more
Note: This is some explanation and pseudocode as to how to implement a very trivial server that can handle incoming and outcoming WebSocket messages as per the definitive framing format. It does not include the handshaking process. Furthermore, this answer has been made for educational purposes; it is not a full-featured implementation. Specification (RFC 6455) … Read more
DTR – Data Terminal Ready DSR – Data Set Ready RTS – Request To Send CTS – Clear To Send There are multiple ways of doing things because there were never any protocols built into the standards. You use whatever ad-hoc “standard” your equipment implements. Just based on the names, RTS/CTS would seem to be … Read more
This would be a very, very hacky way to do this… but would this work? Put the link in as normal… But attach an onclick handler to it, that sets a timer and adds an onblur handler for the window (in theory) if the browser handles the link (application X) will load stealing the focus … Read more
Yes, that’s possible. The syntax is: @interface NSDate (CategoryName) <ProtocolName> @end @implementation NSDate (CategoryName) @end Here’s Apple’s documentation on the topic. It’s also possible to do this using a class extension. I very much like this to privately conform to delegate protocols. Doing so hides the implementation detail of being some delegate of some class … Read more
protocol AddsMoreCommands: class { // Code } extension AddsMoreCommands where Self: UIViewController { // Code }
With trackerless/DHT torrents, peer IP addresses are stored in the DHT using the BitTorrent infohash as the key. Since all a tracker does, basically, is respond to put/get requests, this functionality corresponds exactly to the interface that a DHT (distributed hash table) provides: it allows you to look up and store IP addresses in the … Read more