I’m trying to understand what’s happening under the hood with the following piece of code. The question that I’m having trouble with is: How are static instances of classes handled in c++? #include <iostream> using namespace std; class Shape { public: static Shape& getInstance() { static Shape obj; static Shape& objRef = obj; return objRef;… Read More C++: Can you have a static and a non-static instance of the same class when using the Singleton design pattern?

Currently, I am using get_it package for dependency injection. However, I have confused about singleton and lazySingleton. I know its difference is lazySingleton will not init until it’s used and reduce init time as well as saving resource. However, I don’t know what is drawbacks of lazySinglton with singleton are. Why not replace all singleton… Read More Difference between lazySingleton and singleton in Get_it

Usually for singleton classes, one has to write all the time something like this: SomeSingleton::GetInstance().someVariable And I’m looking for a simplification that can be seen everywhere, so should be put in the (header and source) files of the class itself. So, the (non-working) stuff should look something like this: SomeSingleton.hpp: class SomeSingleton { //… static… Read More Static pointer to a class method, if possible and meaningful

(I have tried searching for "singleton pattern what does m stand for" with no result, but there is a lot of code online with variable names called mInstance.) Code looks something like this: internal sealed class ClassName { private static ClassName mInstance; public static ClassName Instance { get { if (mInstance == null) { mInstance… Read More What does "m" stand for in relation to singleton pattern?

I want to make my UI update itself on singleton’s class property change without passing the singleton object between views as .environmentObject or any another. I have NetworkManager class, which is singleton: final class NetworkManager: ObservableObject { let monitor = NWPathMonitor() let queue = DispatchQueue(label: "NetworkManager") @Published var isConnected = true static let shared: NetworkManager… Read More Update UI on Singleton property change without sharing dependency between Views

I have a WebApi that needs to add a singleton for DI during Setup. But I need to instantiate it during Startup. All of the example code I’ve found online shows something like this: services.AddSingleton(new MyService()); This is great, but what do you do if MyService() takes arguments that are setup in DI? For instance,… Read More In ASP.NET, how to instantiate a singleton object that uses DI during Startup?