singleton

问题 I am trying to bypass the login page to welcome page if the person already have a token. I am using basic auth and afnetworking for the api call. Once the user logs the username&password, I base 64 the info and get a token. I save the token in a nsobject class where I create a token singleton and a simple is logged in method where it checks if the user has the token or not. But for some reason I always see the login page(meaning it skips my condition method). If any one can point out where I

问题 I like to experiment around as I learn more about coding. I have a program that would only require a single instance of a struct for the life of it's runtime and was wondering if it's possible to create a singleton struct. I see lot's of information on making a singleton class on the internet but nothing on making a singleton struct. Can this be done? If so, how? Thanks in advance. Oh, and I work in C++ btw. 回答1: Struct and class are in C++ almost the same (the only difference is default

问题 I have created an instatiator bean for Dozer (http://dozer.sourceforge.net/). But when I Inject this EJB it throws nullpointer exception. Here is my Singleton Startup Bean for intialising Dozer package com.unijunction.ordercloud.common.rest; import javax.annotation.PostConstruct; import javax.annotation.PreDestroy; import javax.inject.Singleton; import javax.ejb.Startup; import org.dozer.DozerBeanMapper; import org.slf4j.Logger; import org.slf4j.LoggerFactory; @Startup @Singleton public class

问题 How can I create a custom class in swift that is of type Array ? To be exact, I have a custom class of type Car , and now I want to create a singleton that is an array of Car s. (Because I want to be able to access it from anywhere in my app). My workaround is to define my singleton as NSMutableArray . But I see that causes my some problems in my code. So I wish to define it as swift array. How can I do it? My code now is: class MyCars: NSMutableArray { class var sharedInstance: MyCars {

问题 Currently I have this implementation of the meyer singleton: class ClassA { public: static ClassA& GetInstance() { static ClassA instance; return instance; } private: ClassA::ClassA() {}; // avoid copying singleton ClassA(ClassA const&); void operator = (ClassA const&); }; Now I need some improvements to getting this code thread safe in C++-98 and VS-2008?! Thanks! PS: What is unclear? You see the tags visual-studio-2008 and c++-98 -> so the target OS is Windows! I also don't understand why I

问题 Closed . This question is opinion-based. It is not currently accepting answers. Want to improve this question? Update the question so it can be answered with facts and citations by editing this post. Closed 3 years ago . I want to create a class where all utility methods will be kept and these methods will be used throughout the app. Problem:1 Is it good to create a singleton class and keep all necessary methods there or should I create a class where all function will be static. Problem:2

问题 is there some approach to make singleton class initialize on programs stack (hence members variables also)? I have tried following, both were failed: 1) class CStack{ public: void* getAlloc(long); static CStack& Instance(){ static CStack theStack; return theStack; } private: bool _data[100]; CStack(){}; CStack(const CStack&); CStack& operator=(const CStack&); }; 2) class CStack{ public: void* getAlloc(long); static CStack* Instance(); private: CStack(){}; CStack(CStack const&){}; CStack&

问题 I'm trying to create a singleton that has variables not directly mutable from the outside. This is my current code: var singleton = new (function () { var asd = 1; this.__defineGetter__("Asd", function() { return asd; }); })(); alert(singleton.Asd) // test However, it seems like alot of ugly code just to achieve a simple thing. What are some cleaner alternatives to create a singleton with such private variables? 回答1: I think only closure can bring real private variable in JavaScript. Usually

问题 Early warning - code sample a little long... I have a singleton NSMutableArray that can be accessed from anywhere within my application. I want to be able to reference the NSMutableArray from multiple NIB files but bind to UI elements via NSArrayController objects. Initial creation is not a problem. I can reference the singleton NSMutableArray when the NIB gets loaded and everything appears fine. However, changing the NSMutableArray by adding or removing objects does not kick off KVO to

问题 Been trying to get a grip of ASP.NET Core MVC but got stuck with dependency injection returning empty collection in my controller action, despite of registering the service as Singleton in ConfigureService method. Tried two different ways to register but only one of them actually works. Said method is as following: public void ConfigureServices(IServiceCollection services) { // Add framework services. services.AddMvc(); /***THIS DOES NOT WORK***/ services.AddSingleton<IRepository<Employee>,