c++ - Singleton implementation - why is a copy constructor needed? -

-

मैंने सिंगलटन डिज़ाइन पैटर्न के लिए यह कोड ऑनलाइन पाया: 

  class Foo {public: static फू & amp; GetInstance () {स्थिर फू उदाहरण; वापसी उदाहरण; } निजी: फू () {}; फू (फू कॉन्स्ट एंड amp;); शून्य ऑपरेटर = (फू कॉन्स्ट एंड amp;); }   
 मुझे समझ में नहीं आया कि कन्स्ट्रक्टर  फ़ू (फ़ू कॉन्स्ट एंड amp);  और  शून्य ऑपरेटर = (फ़ू कॉन्स्ट & amp;); < / कोड> आवश्यक भागों क्या कोई कृपया मुझे समझा सकता है?   
 
 
 क्या आप निम्न कोड को विफल नहीं करना चाहते?  
  int main () {// कॉपी निर्माता का उपयोग करता है Foo x = Foo :: getInstance (); फू यू = फु: :: इन्स्टेंस (); // ऑपरेटर का उपयोग करता है = x = फू :: मिलना (); }   
 ध्यान दें कि हमने उस कोड के अंत में  Foo  के 3 नए उदाहरण बनाए हैं।

Comments

Post a Comment

Popular posts from this blog

php - PDO bindParam() fatal error -

-
I am trying to learn PDO, now I have written this small code, but it gives me a serious error: < P> Fatal error: Call a member function at a non-object dot () ... $ con = new mysqli ("127.0.0.1", "root", "", "csvdangercheck"); $ Query = $ con- & gt; ("Id,` var1`, `var2`) values ​​(" id,: var1,: var2) ";); $ query- & gt; bypass pattern (': id', $ id); $ query- & gt; BindParam (': var1', $ VAL1); $ Query- & gt; bindParam (': var2', $ val2); $ Query-> Executed (); I Trying to use print_r ($ con-> errorInfo ()) but Fatal error: Undefined method mysqli :: errorInfo ( ) ... can someone tell me what am I missing? Flaffeh said, you have PDO Missing Mysqy, try it: $ con = new PDO ('mysql: host = 127.0.0.1; dbname = csvdangercheck', 'root', '');
Read more

logging - How can I log both the Request.InputStream and Response.OutputStream traffic in my ASP.NET MVC3 Application for specific Actions? -

-
For a specific set of tasks, I need to log in to the incoming request inputstream as well as outgoing response. is. I am using an ActionFilterAttribute for this and overriding the OnActionExecuted and OnResultExecuted methods. So I'm starting with this idea ... Public category ActionLoggerAttribute: ActionFilterArrbit {Public Override Zero On-Offed Execution (ActionActioned Contact Filter Filter) {base.OnActionAxecuted (FilterContext); HttpRequestBase request = filterContext.HttpContext.Request; // TODO: Log the request. InputStream} Public Override Zero OnResultExecuted (ResultExecutedContext FilterContext) {base.OnResultExecuted (filterContext); HTTPRPSPointBase Response = FilterContacts Hpptex response; // TODO: Log on Response.OutputStream}} Ideally I'll hook it up with enterprise library logging because I'm already using it for error logging. Am I reaching the input and output stream at the right time? Can I easily use the Enterprise Library to log i
Read more

java - Why my included JSP file won't get processed correctly? -

-
I am trying to create Java web framework (and learning), and on the basis of 'Code Generator In the process of making the material view of the database in the process of development, I stumbled into a difficulty, which I do not know how to solve it. First of all, I want the following index.jsp : & lt; Body & gt; Use all pages to be created. & Lt;% @ include file = "header.jsp"% & gt; & Lt; Hours / & gt; & Lt;% @ included file = "body.jsp"%> & Lt; Hours / & gt; & Lt;% @ include file = "footer.jsp"% & gt; & Lt; / Body & gt; And, in body.jsp , I should have it like this: & lt; Jsp: include page = "$ {Application_modul}"%> Where application_modul is an attribute defined in its controller: request.setAttribute ("application_modul", "USER_ACCOUNT \\ ' View_user_account.jsp "); This file can be found properly, but the processed JSP does
Read more