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: 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

php - How can I cram 6+31 numeric characters into 22 alphanumeric characters? -

-
I have a 6 digit number and a 31-digit number (such as "234536" and "201103231043330478311223582826") that I The API needs to be crawled in the same 22-character alphanumeric field that uses PHP. I tried to convert each one to 32 (using custom code could not handle the base_convert () large number) and to connect with a single-character delimiter, but It only gives me 26 characters This is a restore API, so the letters should be URI-protected. I would like to do a database table cross with two references without reference to another reference value, if possible, any suggestions? Instead use a radix of 62. This will give you 22 characters for the top, 3.35 for the pre and 17.3 for the next. & gt; & Gt; & Gt; Math.log (10 ** 6) /math.log (62) 3.3474826039165504 & gt; & Gt; & Gt; Math.log (10 ** 31) /math.log (62) 17.295326786902177
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