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• a class function with if(this==NULL) test got compiled?

  - by James

  I saw this code snippet during our lab and it actually compiles in MSVC2008 and G++. void LinkList< class T ::Insert(T n) { if (this == NULL) // some code here } As far as I know the this must not be null since you cannot call a class functions in c++ if it wasn't instantiated. Is this a valid code? if so what's the reason behind and where it can be useful?

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• error in creating my own Robot class in android..

  - by manju

  Hi All, I have decided to create my own Java's Robot class in android to take screen capture..i have written the source code of the robot class by my own but the problem is here, the following line in the code is throwing compilation error..saying "The method createRobot(Robot, GraphicsDevice) in the type ComponentFactory is not applicable for the arguments (Robot, GraphicsDevice)" peer = ((ComponentFactory)toolkit).createRobot(this, screen); Can anyone suggest me what would be the solution.... thanks..

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• how can i access a value on a cell in tableview from different class?

  - by ahmet732

  I can hold the value of touched cell but I cannot pass that value to another class or call from that class. SearchTableViewController.m **deneme= [[NSMutableArray alloc]init]; deneme=[tableData objectAtIndex:indexPath.row]; NSLog(@"my row = %@", deneme); //I can hold one of the selected or touched rows in table HistoryTableViewController.m **SearchTableViewController *obj = (SearchTableViewController *)[self.tabBarController.viewControllers objectAtIndex:11]; NSLog(@"my 2nd row= %@", [obj deneme]); //It doesn't retrieve here

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• How to make the class constructor private in Ruby?

  - by Leonid Shevtsov

  class A private def initialize puts "wtf?" end end A.new #still works and calls initialize and class A private def self.new super.new end end doesn't work altogether So what's the correct way? I want to make new private and call it via a factory method.

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• How do I add information to an exception message without changing its class in ruby?

  - by Andrew Grimm

  How do I add information to an exception message without changing its class in ruby? The approach I'm currently using is strings.each_with_index do |string, i| begin do_risky_operation(string) rescue raise $!.class, "Problem with string number #{i}: #{$!}" end end Is there a better way?

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• How to combine ASCII text files, then encrypt, then decrypt, and put into a 'File' Class? C++

  - by Joel

  For example, if I have three ASCII files: file1.txt file2.txt file3.txt ...and I wanted to combine them into one encrypted file: database.txt Then in the application I would decrypt the database.txt and put each of the original files into a 'File' class on the heap: class File{ public: string getContents(); void setContents(string data); private: string m_data; }; Is there some way to do this? Thanks

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• How to make user control partial classes aware of controls declared in the base class?

  - by Helephant

  Do we have to do something special to have ASP.NET partial classes aware of controls that are declared in our user control's base classes? The partial classes keep generating declarations for controls in the base class which mean the controls in the base class get hidden and are null.

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• How can I access class variable inside a NSMutableArray object?

  - by ahmet732

  I have "Man" class which also has 2 variable : "description" and "name". At a point, I created Man class and initialize with its own variables (description and name) and pass it to NSMutableArray "collector". How can I access description now ? I tried but i could not get the property

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• How to run a single test method in simpletest unittest class ?

  - by shikhar

  This is my Unit Test class <? require_once '../simpletest/unit_tester.php'; require_once '../simpletest/reporter.php'; class Academic extends UnitTestCase { function setUp() { } function tearDown() { } function testAc1() { } function testAc4() { } function testAc7() { } } $test = new Academic(); $test->run(new HtmlReporter()); ?> When I run this script all methods viz., testAc1, testAc4, testAc7 etc are run. Is there a way to execute just a single method ? Thanks, Shikhar

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• Can I create class properties during __new__ or __init__?

  - by 007brendan

  I want to do something like this. The _print_attr function is designed to be called lazily, so I don't want to evaluate it in the init and set the value to attr. I would like to make attr a property that computes _print_attr only when accessed: class Base(object): def __init__(self): for attr in self._edl_uniform_attrs: setattr(self, attr, property(lambda self: self._print_attr(attr))) def _print_attr(self, attr): print attr class Child(Base): _edl_uniform_attrs = ['foo', 'bar'] me = Child() me.foo me.bar #output: #"foo" #"bar"

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• In actionscript, why is my static class member variable not the same when accessed from different pa

  - by Ryan M

  I have an actionscript class with a static member variable defined. public class A { public static var x:int; } When I try to access it from different parts in my code I don't get the same value in each spot. A.x I am accessing the variable in different modules that are loaded, so they are all in their own separate .swf file. Could this by why?

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• Enterprise Library--Validator.cs How Abstract Class having definition??

  - by Soham

  Consider this piece of code: public abstract class Validator { protected Validator() { } protected abstract void ValidateCore(object instance, string value, IList<ValidationResult> results); public void Validate(object instance, string value, IList<ValidationResult> results) { if (null == instance) throw new ArgumentNullException("instance"); if (null == results) throw new ArgumentNullException("results"); ValidateCore(instance, value, results); } } TAKE a look at Validate() overload, how can an abstract class have definitions like this?

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• How to write a contains statement to match a member of a class?

  - by afuzzyllama

  If I have the following structure: Public Class UserData Public ID As String Public Name As String End Class How can I select it in a conditional like this? Dim myUsers As New List(Of UserData) If myUsers.Contains(.ID = "1") = True Then ... I know that myUsers.Contains(.ID = "1") is totally wrong, but I am curious how to do something like that? Is it possible? Is this a job for LINQ?

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• What .NET serializers have fixed size output for a given class?

  - by Jader Dias

  XML based serializers have variable size output for a given class. I can't use them to append data to my Memcached list, since I won't be able to retrieve that information later. But if I knew my serializer produced a fixed size output (N bytes), I could retrieve my data by splitting my list in N bytes chunks and then deserializing those chunks individually. I have created my own serializer for my class, but what other serializers I could use?

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• Is there a way to restrict a public method access to only a specific class in C#/.Net?

  - by Anon

  I have a class A with a public method in C#. I want to allow access to this method to only class B. Is this possible? How?

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• How to debug if using the java.io.Console class (netbeans).

  - by cchampion

  The java.io.Console class requires there to be a Console device (window). How can I debug if I am using this class? I'm using netbeans IDE.

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• Declare array as return type in gen-class method declaration in Clojure.

  - by Anton Kazennikov

  How to declare an array in method declaration in gen-class? (ns foo.bar (:gen-class :methods [[parseString [String Object] Object]])) That works fine. But the return type is really an array. How I can declare that so Java can understand it?

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• Toggleclass doesn't seem to toggle class, what am I doing wrong?

  - by Kyle Sevenoaks

  Hi, I've been trying to make a button toggle a class, as well as show another div below it. Here is a jsFiddle example I have made for you. The first function works perfectly, shows and hides the div, but also I want the button itself to add and remove a class, I thought this would work but I seem to be doing something wrong. Thanks.

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• Which class does the animations in a table view cell when the table view enters editing mode?

  - by mystify

  Is it the UITableViewCell class itself which contains the animation logic for entering editing mode, or does the UITableView class animate the changes in the cell? (like the width of contentView and other things)

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• how to save class object in registry, C sharp.

  - by younevertell

  Basically I have one class object with some properties. Is there any way I can save the class object in registry, not the properties seperately? It seems RegistryKey.SetValue Method can not save an object directly?

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• jqgrid : how to change the class of one cell (when mouse is over on) ?

  - by Qualliarys

  Hi, I set cells of the first column of my grid, with a class as follow: $("#myGrid").jqGrid('setCell',rowid,'column_1', '', '**ui-state-default**'); How to change the class of a cell when the mouse is over on it ? Thanks you so much !

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• How to group methods belong to one entity in one class file in Core Data like Linq?

  - by Siegfried

  How to group methods belong to one entity in one class file in Core Data like Linq? In Linq, we can put all methods in the domain object class and reuse them, in Core Data, is there any way to create different classes for different entities? Or we can only use predicate to retrieve?

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• Are class methods convenience methods i.e. part of the framework

  - by user333639

  Are class methods convenience methods i.e. part of the framework e.g. +(id)alloc and instance methods are those that were implemented by the developer? I can't seem to understand the difference between instance methods and class methods.

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• Is there a C# equivalent to the Java Selector class?

  - by DayOne

  Is there a C# equivalent to the Java Selector class? In the .Net framework or opensource. This is the java.nio.channels.Selector class. Thanks

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• Why isn't the Type class in the System.Reflection namespace?

  - by Arc

  Everything about Type is reflective in nature. Is it because Type is used more often than the rest of the classes in System.Reflection? Or because it functions more like a system class than a reflection class? In short, I've always wondered what the motivation behind the location of System.Type was.

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