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  • Why can't I declare C# methods virtual and static?

    - by Luke
    I have a helper class that is just a bunch of static methods and would like to subclass the helper class. Some behavior is unique depending on the subclass so I would like to call a virtual method from the base class, but since all the methods are static I can't create a plain virtual method (need object reference in order to access virtual method). Is there any way around this? I guess I could use a singleton.. HelperClass.Instance.HelperMethod() isn't so much worse than HelperClass.HelperMethod(). Brownie points for anyone that can point out some languages that support virtual static methods. Edit: OK yeah I'm crazy. Google search results had me thinking I wasn't for a bit there.

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  • Is a switch statement the fastest way to implement operator interpretation in Java

    - by Mordan
    Is a switch statement the fastest way to implement operator interpretation in Java public boolean accept(final int op, int x, int val) { switch (op) { case OP_EQUAL: return x == val; case OP_BIGGER: return x > val; case OP_SMALLER: return x < val; default: return true; } } In this simple example, obviously yes. Now imagine you have 1000 operators. would it still be faster than a class hierarchy? Is there a threshold when a class hierarchy becomes more efficient in speed than a switch statement? (in memory obviously not) abstract class Op { abstract public boolean accept(int x, int val); } And then one class per operator.

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  • add methods in subclasses within the super class constructor

    - by deamon
    I want to add methods (more specifically: method aliases) automatically to Python subclasses. If the subclass defines a method named 'get' I want to add a method alias 'GET' to the dictionary of the subclass. To not repeat myself I'd like to define this modifation routine in the base class. But if I check in the base class init method, there is no such method, since it is defined in the subclass. It will become more clear with some source code: class Base: def __init__(self): if hasattr(self, "get"): setattr(self, "GET", self.get) class Sub(Base): def get(): pass print(dir(Sub)) Output: ['__doc__', '__init__', '__module__', 'get'] It should also contain 'GET'. Is there a way to do it within the base class?

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  • IRequest / IResponse Pattern

    - by traderde
    I am trying to create an Interface-based Request/Response pattern for Web API requests to allow for asynchronous consumer/producer processing, but not sure how I would know what the underlying IResponse class is. public void Run() { List<IRequest> requests = new List<IRequest>(); List<IResponse> responses = new List<IResponse(); requests.Add(AmazonWebRequest); //should be object, trying to keep it simple requests.Add(EBayWebRequest); //should be object, trying to keep it simple foreach (IRequest req in requests) { responses.Add(req.GetResponse()); } foreach (IResponse resp in response) { typeof resp???? } } interface IRequest { IResponse GetResponse(); } interface IResponse { } public class AmazonWebServiceRequest : IRequest { public AmazonWebServiceRequest() { //get data; } public IResponse GetResponse() { AmazonWebServiceRequest request = new AmazonWebServiceRequest(); return (IResponse)request; } } public class AmazonWebServiceResponse : IResponse { XmlDocument _xml; public AmazonWebServiceResponse(XmlDocument xml) { _xml = xml; _parseXml(); } private void _parseXml() { //parse Xml into object; } } public class EBayWebRequest : IRequest { public EBayWebRequest () { //get data; } public IResponse GetResponse() { EBayWebRequest request = new EBayWebRequest(); return (IResponse)request; } } public class EBayWebResponse : IResponse { XmlDocument _xml; public EBayWebResponse(XmlDocument xml) { _xml = xml; _parseXml(); } private void _parseXml() { //parse Xml into object; } }

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  • What's wrong with my Objective-C class?

    - by zgillis
    I am having trouble with my Objective-C code. I am trying to print out all of the details of my object created from my "Person" class, but the first and last names are not coming through in the NSLog method. They are replaced by spaces. Person.h: http://pastebin.com/mzWurkUL Person.m: http://pastebin.com/JNSi39aw This is my main source file: #import <Foundation/Foundation.h> #import "Person.h" int main (int argc, const char * argv[]) { Person *bobby = [[Person alloc] init]; [bobby setFirstName:@"Bobby"]; [bobby setLastName:@"Flay"]; [bobby setAge:34]; [bobby setWeight:169]; NSLog(@"%s %s is %d years old and weighs %d pounds.", [bobby first_name], [bobby last_name], [bobby age], [bobby weight]); return 0; }

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  • Java - Should private instance variables be accessed in constructors through getters and setters met

    - by Yatendra Goel
    I know that private instance variables are accessed through their public getters and setters method. But when I generate constructors with the help of IDE, it initializes instance variables directly instead of initializing them through their setter methods. Q1. So should I change the IDE generated code for constructors to initialize those instance variables through their setter methods. Q2. If yes, then why IDE don't generate constructors code in that way?

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  • Inconsistent get_class_methods vs method_exists when using UTF8 characters in PHP code

    - by coma
    I have this class in a UTF-8 encoded file called EnUTF8.Class.php: class EnUTF8 { public function ñññ() { return 'ñññ()'; } } and in another UTF-8 encoded file: require_once('EnUTF8.Class.php'); require_once('OneBuggy.Class.php'); $utf8 = new EnUTF8(); //$buggy = new OneBuggy(); echo (method_exists($utf8, 'ñññ')) ? 'ñññ() exists!' : 'ñññ() does not exist...'; echo "\n\n----------------------------------\n\n" print_r(get_class_methods($utf8)); echo "\n----------------------------------\n\n" echo $utf8->ñññ(); that produces the expected result: ñññ() exists! ---------------------------------- Array ( [0] => ñññ ) ---------------------------------- ñññ() but if... require_once('EnUTF8.Class.php'); require_once('OneBuggy.Class.php'); $utf8 = new EnUTF8(); $buggy = new OneBuggy(); echo (method_exists($utf8, 'ñññ')) ? 'ñññ() exists!' : 'ñññ() does not exist...'; echo "\n\n----------------------------------\n\n" print_r(get_class_methods($utf8)); echo "\n----------------------------------\n\n" echo $utf8->ñññ(); then the weirdness appears!!!: ñññ() does not exist! ---------------------------------- Array ( [0] => ñññ ) ---------------------------------- Fatal error: Call to undefined method EnUTF8::ñññ() in /var/www/test.php on line 16 Well, the thing is that OneBuggy.Class.php is UTF-8 encoded too and shares absolutly nothing with EnUTF8.Class.php so... where is the bug? UPDATED: Well, after a long debugging time I found this in OneBuggy.Class.php constructor: setlocale (LC_ALL, "es_ES@euro", "es_ES", "esp"); so I did... //setlocale (LC_ALL, "es_ES@euro", "es_ES", "esp"); and now it works but why?.

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  • Best way to represent Gender in a class library used in multilingual applications

    - by Hauge
    I'm creating class library with some commonly used classes like persons, addresses etc. This library will be used in an multilingual application, and I am looking for the most convenient way to represent a persons gender. Ideally I would like to be able to code like this: Person person = new Person { Gender = Genders.Male, FirstName = "Nice", LastName = "Dude" } if (person.Gender == Genders.Male) Console.WriteLine("person is Male"); Console.WriteLine(person.Gender); //Should output: Male Console.WriteLine(person.Gender.ToString("da-DK")); //Should output the name of the gender in the language provided List<Gender> genders = Genders.GetAll(); foreach(Gender gender in genders) { Console.WriteLine(gender.ToString()); Console.WriteLine(gender.ToString("da-DK")); } What would you do? An enumeration and a specialized Gender class, but what about the localization then? Regards Jesper Hauge

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  • help fixing pagination class

    - by michael
    here is my pagination class. the data in the construct is just an another class that does db queries and other stuff. the problem that i am having is that i cant seem to get the data output to match the pagination printing and i cant seem to get the mysql_fetch_assoc() to query the data and print it out. i get this error: Warning: mysql_fetch_assoc(): supplied argument is not a valid MySQL result resource in /phpdev/pagination/index.php on line 215 i know that can mean that the query isnt correct for it to fetch the data but i have entered it correctly. sorry for the script being a little long. i thank all in advance for any help. <?php include_once("class.db.php"); mysql_connect("host","login","password"); mysql_select_db("iadcart"); class Pagination { var $adjacents; var $limit; var $param; var $mPage; var $query; var $qData; var $printData; protected $db; function __construct() { $this->db = new MysqlDB; } function show() { $result = $this->db->query($this->query); $totalPages = $this->db->num_rows($result); $limit = $this->limit; /* ------------------------------------- Set Page ------------------------------------- */ if(isset($_GET['page'])) { $page = intval($_GET['page']); $start = ($page - 1) * $limit; } else { $start = 0; } /* ------------------------------------- Set Page Vars ------------------------------------- */ if($page == 0) { $page = 1; } $prev = $page - 1; $next = $page + 1; $lastPage = ceil($totalPages/$limit); $lpm1 = $lastPage - 1; $adjacents = $this->adjacents; $mPage = $this->mPage; //the magic $this->qData = $this->query . " LIMIT $start, $limit"; $this->printData = $this->db->query($this->qData); /* ------------------------------------- Draw Pagination Object ------------------------------------- */ $pagination = ""; if($lastPage > 1) { $pagination .= "<div class='pagination'>"; } /* ------------------------------------- Previous Link ------------------------------------- */ if($page > 1) { $pagination .= "<li><a href='$mPage?page=$prev'> previous </a></li>"; } else { $pagination .= "<li class='previous-off'> previous </li>"; } /* ------------------------------------- Page Numbers (not enough pages - just display active page) ------------------------------------- */ if($lastPage < 7 + ($adjacents * 2)) { for($counter = 1; $counter <= $lastPage; $counter++) { if($counter == $page) { $pagination .= "<li class='active'>$counter</li>"; } else { $pagination .= "<li><a href='$mPage?page=$counter'>$counter</a></li>"; } } } /* ------------------------------------- Page Numbers (enough pages to paginate) ------------------------------------- */ elseif($lastPage > 5 + ($adjacents * 2)) { //close to beginning; only hide later pages if($page < 1 + ($adjacents * 2)) { for ($counter = 1; $counter < 4 + ($adjacents * 2); $counter++) { if ($counter == $page) { $pagination.= "<li class='active'>$counter</li>"; } else { $pagination.= "<li><a href='$mPage?page=$counter'>$counter</a></li>"; } } $pagination.= "..."; $pagination.= "<li><a href='$mPage?page=$lpm1'>$lpm1</a></li>"; $pagination.= "<li><a href='$mPage?page=$lastPage'>$lastPage</a></li>"; } elseif($lastPage - ($adjacents * 2) > $page && $page > ($adjacents * 2)) { $pagination.= "<li><a href='$mPage?page=1'>1</a></li>"; $pagination.= "<li><a href='$mPage?page=2'>2</a></li>"; $pagination.= "..."; for ($counter = $page - $adjacents; $counter <= $page + $adjacents; $counter++) { if ($counter == $page) { $pagination.= "<li class='active'>$counter</li>"; } else { $pagination.= "<li><a href='$mPage?page=$counter'>$counter</a></li>"; } } $pagination.= "..."; $pagination.= "<li><a href='$mPage?page=$lpm1'>$lpm1</a></li>"; $pagination.= "<li><a href='$mPage?page=$lastPage'>$lastPage</a></li>"; } else { $pagination.= "<li><a href='$mPage?page=1'>1</a></li>"; $pagination.= "</li><a href='$mPage?page=2'>2</a></li>"; $pagination.= "..."; for ($counter = $lastPage - (2 + ($adjacents * 2)); $counter <= $lastPage; $counter++) { if ($counter == $page) { $pagination.= "<li class='active'>$counter</li>"; } else { $pagination.= "<li><a href='$mPage?page=$counter'>$counter</a></li>"; } } } } /* ------------------------------------- Next Link ------------------------------------- */ if ($page < $counter - 1) { $pagination.= "<li><a href='$mPage?page=$next'> Next </a></li>"; } else { $pagination.= "<li class='next-off'> Next </li>"; $pagination.= "</div>"; } print $pagination; } } ?> <html> <head> </head> <body> <table style="width:800px;"> <?php mysql_connect("localhost","root","games818"); mysql_select_db("iadcart"); $pagination = new pagination; $pagination->adjacents = 3; $pagination->limit = 10; $pagination->param = $_GET['page']; $pagination->mPage = "index.php"; $pagination->query = "select * from tbl_products where pVisible = 'yes'"; while($row = mysql_fetch_assoc($pagination->printData)) { print $row['pName']; } ?> </table> <br/><br/> <?php $pagination->show(); ?> </body> </html>

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  • Keyword 'this'(Me) is not available calling the base constructor

    - by serhio
    In the inherited class I use the base constructor, but can't use class's members calling this base constructor. In this example I have a PicturedLabel that knows it's own color and has a image. A TypedLabel : PictureLabel knows it's type but uses the base color. The (base)image that uses TypedLabel should be colored with the (base)color, however, I can't obtain this color: Error: Keyword 'this' is not available in the current context A workaround? /// base class public class PicturedLabel : Label { PictureBox pb = new PictureBox(); public Color LabelColor; public PicturedLabel() { // initialised here in a specific way LabelColor = Color.Red; } public PicturedLabel(Image img) : base() { pb.Image = img; this.Controls.Add(pb); } } public enum LabelType { A, B } /// derived class public class TypedLabel : PicturedLabel { public TypedLabel(LabelType type) : base(GetImageFromType(type, this.LabelColor)) //Error: Keyword 'this' is not available in the current context { } public static Image GetImageFromType(LabelType type, Color c) { Image result = new Bitmap(10, 10); Rectangle rec = new Rectangle(0, 0, 10, 10); Pen pen = new Pen(c); Graphics g = Graphics.FromImage(result); switch (type) { case LabelType.A: g.DrawRectangle(pen, rec); break; case LabelType.B: g.DrawEllipse(pen, rec); break; } return result; } }

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  • To subclass or not to subclass

    - by poulenc
    I have three objects; Action, Issue and Risk. These all contain a nunber of common variables/attributes (for example: Description, title, Due date, Raised by etc.) and some specific fields (risk has probability). The question is: Should I create 3 separate classes Action, Risk and Issue each containing the repeat fields. Create a parent class "Abstract_Item" containing these fields and operations on them and then have Action, Risk and Issue subclass Abstract_Item. This would adhere to DRY principal.

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  • Extending DOMDocument and DOMNode: problem with return object

    - by Glauber Rocha
    I'm trying to extend the DOMDocument class so as to make XPath selections easier. I wrote this piece of code: class myDOMDocument extends DOMDocument { function selectNodes($xpath){ $oxpath = new DOMXPath($this); return $oxpath->query($xpath); } function selectSingleNode($xpath){ return $this->selectNodes($xpath)->item(0); } } These methods return a DOMNodeList and a DOMNode object, respectively. What I'd like to do now is to implement similar methods to the DOMNode objects. But obviously if I write a class (myDOMNode) that extends DOMNode, I won't be able to use these two extra methods on the nodes returned by myDOMDocument because they're DOMNode (and not myDOMNode) objects. I'm rather a beginner in object programming, I've tried various ideas but they all lead to a dead-end. Any hints? Thanks a lot in advance.

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  • How can i call method from class but this method implemented from any interface?

    - by Phsika
    i try to call base.Alan(); in HacimBul. But base. dont give intellisense alan method public double HacimBul() { throw new Exception(); //return base..... -- how can i see base.Alan(); } namespace interfaceClass { class Program { static void Main(string[] args) { } } interface Ikenar { double kenar { get; set; } } interface Iyukseklik { double yuksekli {get; set;} } interface IAlan { double Alan(); } interface IHacim { double Hacim(); } class Alan : Ikenar, IAlan { public double kenar { get; set; } double IAlan.Alan() { return kenar * kenar; } } class Hacim : Alan, Iyukseklik { public double kenar { get; set; } public double yuksekli { get; set; } public double HacimBul() { throw new Exception(); //return base..... -- how can i see base.Alan(); } } }

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  • How can i call method from class but this method implamented from any interface?

    - by Phsika
    i try to call base.Alan(); in HacimBul. But base. dont give intellisense alan method public double HacimBul() { throw new Exception(); //return base..... -- how can i see base.Alan(); } namespace interfaceClass { class Program { static void Main(string[] args) { } } interface Ikenar { double kenar { get; set; } } interface Iyukseklik { double yuksekli {get; set;} } interface IAlan { double Alan(); } interface IHacim { double Hacim(); } class Alan : Ikenar, IAlan { public double kenar { get; set; } double IAlan.Alan() { return kenar * kenar; } } class Hacim : Alan, Iyukseklik { public double kenar { get; set; } public double yuksekli { get; set; } public double HacimBul() { throw new Exception(); //return base..... -- how can i see base.Alan(); } } }

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  • How to get the path of a derived class from an inherited method?

    - by Jacco
    How to get the path of the current class, from an inherited method? I have the following: <?php // file: /parentDir/class.php class Parent { protected function getDir() { return dirname(__FILE__); } } ?> and <?php // file: /childDir/class.php class Child extends Parent { public function __construct() { echo $this->getDir(); } } $tmp = new Child(); // output: '/parentDir' ?> The __FILE__ constant always points to the source-file of the file it is in, regardless of inheritance. I would like to get the name of the path for the derived class. Is there any elegant way of doing this? I could do something along the lines of $this->getDir(__FILE__); but that would mean that I have to repeat myself quite often. I'm looking for a method that puts all the logic in the parent class, if possible. Update: Accepted solution (by Palantir): <?php // file: /parentDir/class.php class Parent { protected function getDir() { $reflector = new ReflectionClass(get_class($this)); return dirname($reflector->getFileName()); } } ?>

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  • Help me with a solution for what could be solutioned by virtual static fields... in FPC

    - by Gregory Smith
    Hi I'm doing an event manager in Freepascal Each event is an object type TEvent (=object), each kind of event must derive from this class. Events are differentiated by an integer identificator, assigned dynamically. The problem is that i want to retrieve the event id of an instance, and i can't do it well. All instances of a class(object) have a unique id = so it should be static field. All classes have a diferent id = so it should be virtual. Event ids are assignated in run time, and can change = so it can't be a simple method In sum, I can't put all this together. I'm looking for an elegant solution, i don't want to write a hardcoded table, actualizing it in every constructor... etc, i'd prefer something taking advantage of the polymorphism Can anyone help me with another technical or design solution? I remark I don't want to use class instead of object construct.(property doesn't work on objects? :(

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  • What is a good standard exercise to learn the OO features of a language?

    - by FarmBoy
    When I'm learning a new language, I often program some mathematical functions to get used to the control flow syntax. After that, I like to implement some sorting algorithms to get used to the array/list constructs. But I don't have a standard exercise for exploring the languages OO features. Does anyone have a stock exercise for this? A good answer would naturally lend to inheritance, polymorphism, etc., for a programmer already comfortable with these concepts. An ideal answer would be one that could be communicated in a few words, without ambiguity, in the way that "implement mergesort" is completely unambiguous. (As an example, answering "design a game" is so vague as to be useless.) Any ideas? EDIT: I have to remark that the results here are somewhat ironic. 10 upvotes and (originally) 5 favorites suggest that this is a question others are interested in. Yet the most upvoted answer is one that says there is no good answer. Oh well. I think I'll look at the textbook below, I've found games useful in the past for OO.

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  • Socket server with multiple clients, sending messages to many clients without hurting liveliness

    - by Karl Johanson
    I have a small socket server, and I need to distribute various messages from client-to-client depending on different conditionals. However I think I have a small problem with livelyness in my current code, and is there anything wrong in my approach: public class CuClient extends Thread { Socket socket = null; ObjectOutputStream out; ObjectInputStream in; CuGroup group; public CuClient(Socket s, CuGroup g) { this.socket = s; this.group = g; out = new ObjectOutputStream(this.socket.getOutputStream()); out.flush(); in = new ObjectInputStream(this.socket.getInputStream()); } @Override public void run() { String cmd = ""; try { while (!cmd.equals("client shutdown")) { cmd = (String) in.readObject(); this.group.broadcastToGroup(this, cmd); } out.close(); in.close(); socket.close(); } catch (Exception e) { System.out.println(this.getName()); e.printStackTrace(); } } public void sendToClient(String msg) { try { this.out.writeObject(msg); this.out.flush(); } catch (IOException ex) { } } And my CuGroup: public class CuGroup { private Vector<CuClient> clients = new Vector<CuClient>(); public void addClient(CuClient c) { this.clients.add(c); } void broadcastToGroup(CuClient clientName, String cmd) { Iterator it = this.clients.iterator(); while (it.hasNext()) { CuClient cu = (CuClient)it.next(); cu.sendToClient(cmd); } } } And my main-class: public class SmallServer { public static final Vector<CuClient> clients = new Vector<CuClient>(10); public static boolean serverRunning = true; private ServerSocket serverSocket; private CuGroup group = new CuGroup(); public void body() { try { this.serverSocket = new ServerSocket(1337, 20); System.out.println("Waiting for clients\n"); do { Socket s = this.serverSocket.accept(); CuClient t = new CuClient(s,group); System.out.println("SERVER: " + s.getInetAddress() + " is connected!\n"); t.start(); } while (this.serverRunning); } catch (IOException ex) { ex.printStackTrace(); } } public static void main(String[] args) { System.out.println("Server"); SmallServer server = new SmallServer(); server.body(); } } Consider the example with many more groups, maybe a Collection of groups. If they all synchronize on a single Object, I don't think my server will be very fast. I there a pattern or something that can help my liveliness?

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  • Possible mem leak?

    - by LCD Fire
    I'm new to the concept so don't be hard on me. why doesn't this code produce a destructor call ? The names of the classes are self-explanatory. The SString will print a message in ~SString(). It only prints one destructor message. int main(int argc, TCHAR* argv[]) { smart_ptr<SString> smt(new SString("not lost")); new smart_ptr<SString>(new SString("but lost")); return 0; } Is this a memory leak? The impl. for smart_ptr is from here edited: //copy ctor smart_ptr(const smart_ptr<T>& ptrCopy) { m_AutoPtr = new T(ptrCopy.get()); } //overloading = operator smart_ptr<T>& operator=(smart_ptr<T>& ptrCopy) { if(m_AutoPtr) delete m_AutoPtr; m_AutoPtr = new T(*ptrCopy.get()); return *this; }

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  • adding one time options to items

    - by rap-uvic
    Hello, I'm building an Event Registration site. For any given event, we'll have a handful of items to choose from. I have a table for these items. For each event we might have special options for users. For example, for one of the events new users get to buy an item which is not available to other users. This may not apply to all the events. For other events we might have some other restriction on items. I will obviously be checking this programmatically on application side. I would like to though, set up a column containing flag in the items table. But I don't find it feasible because this condition may only apply to one particular event. I don't want all the future items to have this column. What is a good approach to take in such a situation? Should I create a special "restrictions" table and just do a join? How would I handle this on the application side?

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  • MVC pattern and State Machine

    - by topright
    I think of a game as a state machine. Game States separate I/O processing, game logic and rendering into different classes: while (game_loop) { game->state->io_events(this); game->state->logic(this); game->state->rendering(); } You can easily change a game state in this approach. MVC separation works in more complex way: while (game_loop) { game->cotroller->io_events(this); game->model->logic(this); game->view->rendering(); } So changing Game States becomes error prone task (switch 3 MVC objects, not 1). What are practical ways of combining these 2 concepts?

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  • why assign null value or another default value firstly?

    - by Phsika
    i try to generate some codes. i face to face delegates. Everythings is ok.(Look below) But appearing a warning: you shold assing value why? but second code below is ok. namespace Delegates { class Program { static void Main(string[] args) { HesapMak hesapla = new HesapMak(); hesapla.Calculator = new HesapMak.Hesap(hesapla.Sum); double sonuc = hesapla.Calculator(34, 2); Console.WriteLine("Toplama Sonucu:{0}",sonuc.ToString()); Console.ReadKey(); } } class HesapMak { public double Sum(double s1, double s2) { return s1 + s2; } public double Cikarma(double s1, double s2) { return s1 - s2; } public double Multiply(double s1, double s2) { return s1 * s2; } public double Divide(double s1, double s2) { return s1 / s2; } public delegate double Hesap(double s1, double s2); public Hesap Calculator; ----&#60; they want me assingn value } } namespace Delegates { class Program { static void Main(string[] args) { HesapMak hesapla = new HesapMak(); hesapla.Calculator = new HesapMak.Hesap(hesapla.Sum); double sonuc = hesapla.Calculator(34, 2); Console.WriteLine("Toplama Sonucu:{0}",sonuc.ToString()); Console.ReadKey(); } } class HesapMak { public double Sum(double s1, double s2) { return s1 + s2; } public double Cikarma(double s1, double s2) { return s1 - s2; } public double Multiply(double s1, double s2) { return s1 * s2; } public double Divide(double s1, double s2) { return s1 / s2; } public delegate double Hesap(double s1, double s2); public Hesap Calculator=null; } }

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