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• Python singleton pattern

  - by Javier Garcia

  Hi, someone can tell me why this is incorrect as a singleton pattern: class preSingleton(object): def __call__(self): return self singleton = preSingleton() a = singleton() b = singleton() print a==b a.var_in_a = 100 b.var_in_b = 'hello' print a.var_in_b print b.var_in_a Edit: The above code prints: True hello 100 thank you very much

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• class vs structure c#

  - by Enriquev

  I'm doing course 3354 (Implementing System Types and Interfaces in the .NET Framework 2.0) and it is said that for simple classes, with members variables and functions, it is better to use a struct than a class because of overhead. I have never heard of such a thing, what is the validity of this claim?

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• winsock component

  - by Oghenero

  i have a winsock component made with vb.net in a class library that has events. how do i make it appear in tool box if i reference the dll in another project.? How do i use it in my c# program? thanks

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• Visual Studio C#: Why is a "using" directive insufficient for some libraries?

  - by JYelton

  Scenario: I needed to add HttpUtility to my project, and I started by adding "using System.Web" to my collection of using directives. However the HttpUtility class would still not resolve, and I discovered (via this question) that I needed to add a reference to my project. Question: Why do I need to add a reference to this library when for most other classes a "using" directive will suffice?

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• should_receive in RSpec

  - by gmile

  As far as I know, should_receive is applied only to mock objects. What I want is to check, if a certain Class (not object) received a certain message, like: User.should_receive(:all).once How do I do that?

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• How can I use cout<<myclass?

  - by ali

  myclass is a c++ class writed by me . and when I write myclass x; cout << x; // how to output is " 10 " or "20" like intger or float value

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• How to access class member from bison action

  - by yodhevauhe

  I am calling yyparse from a member function. How to access the member variables/function from the bison action. I am currently doing as %{ #include "myclass.h" #include "parse.tab.hh" MyClass *ptr=NULL; void MyClass::evaluate(string expression) { ptr=this; yy_scan_string(expression.c_str()); yyparse(); } %} %% EXPR : EXPR PLUS EXPR { $$ = ptr->memberFunction("+",$1,$3); }

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• Why need to mention "Supported by the .NET Compact Framework" for classes members ?

  - by pointlesspolitics

  In MSDN documentation, many .NET classes methods (like ArrayList ) mentioned that "Supported by the .NET Compact Framework". How internally it has been modified so that it has been supported by .NET compact Framework? I assumed all the .NET Base class library can be used on .NET compact Framework.

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• Check if a selector have a certain set of classes

  - by emilolsson

  Hello I'm trying to be able to check if a selector have a certain sets of classes. .hasClass() can only check if the selector has one class. And the .is() selector can look for multiple classes but will return true if the selector have at least one of the classes. But I wan't to achieve a way to check if a selector have both of the classes, and only if it has both of the classes do action. Any pointers?

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• Overload constructor for Scala's Case Classes?

  - by Felix

  In Scala 2.8 is there a way to overload constructors of a case class? If yes, please put a snippet to explain, if not, please explain why?

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• I created a java application which consists of many swing frames

  - by Muhammed Yoosuf

  My question is could anyone please tell me how I could convert my java CLASS file into an exe file, so that it could be easily deployed.

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• wxPython dictionary of classes to events they call

  - by None

  I was wondering if there was a dictionary containing string versions of wxPython class (like 'Button' for wx.Button) to the events they call. This is what I want: {'Button': wx.EVT_BUTTON, ...}. Is there a dictionary like this anywhere in the module or on the web?

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• UML tool similar to USE

  - by llazzaro

  Hello, To "simulate" instances from class diagrams I am using USE But I find very frustating to create instances. I am looking for similar tools like this one. I really like USE, but GUI is painfull. I think, that USE is pretty cool to learn how the model "works". Do you know similar tools like this one?

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• Class destructor memory handling in C++

  - by wyatt

  What potential memory leaks won't an implicit destructor handle? I know that if you have anything stored on the heap it won't handle it, and if you have a connection to a file or a database, that needs to be handled manually. Is there anything else? What about, say, non-base data types like vectors? Also, in an explicit destructor, need you destroy non-heap variables which would have been destroyed by the implicit, or are they handled automatically? Thanks

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• Is there a Pattern in Scala that add a method to an Array object?

  - by Fred Haslam

  Is there a Pattern in Scala that can add a method to an Array object? I am thinking of the implicit conversion of Int to RichInt. But that can't be done as Array is a final class.

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• DoubleClick studio thinks I've imported the Enabler component in both my parent and my child asset f

  - by Marijn Huizendveld

  I've just started to work with DoubleClick Studio. I've successfully created a Flash expanding ad with CS4 that is mostly scripted and uses the Document class option. Now for some reason the back end of DoubleClick Studio thinks I've imported the Enabler component twice. I've checked my files numerous of times but can't find the root cause. Any help is much appreciated :)

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• Creating Delphi Objects at runtime based on class type

  - by Sandeep

  Is it possible to create objects at runtime based on it's type by calling a method. What I am trying to achieve is var lForm1 : TForm; lForm2 : TForm; begin CreateObjects([lForm1, lForm2]); // After this call I have the variables initialized and I can use them. end;

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• Any way to force classes to have public static final field in Java?

  - by serg555

  Is there a way to force classes in Java to have public static final field (through interface or abstract class)? Or at least just a public field? I need to make sure somehow that a group of classes have public static final String TYPE = "..."; in them.

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• jQuery .hasClass method to omit effect

  - by Jonny Wood

  I've created a simple background effect for some tabs on a page but don't want that effect to fire if the tab has the class 'current'. I presume there is a way to do this using .hasClass Here's what I'm using for the effect: $('ul.htabs a').mouseover(function(){ $(this).stop().animate( {backgroundPosition:"(0 -810px)"}, {duration:150}, {easing: 'easeOutCubic'}) }).mouseout(function(){ $(this).stop().animate( {backgroundPosition:"(0 -806px)"}, {duration:150}, {easing: 'easeInCubic'}) });

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• Are classes in Python in different files?

  - by Asaf

  Much like Java (or php), I'm use to seperating the classes to files. Is it the same deal in Python? plus, how should I name the file? Lowercase like classname.py or the same like ClassName.py? Do I need to do something special if I want to create an object from this class or does the fact that it's in the same "project" (netbeans) makes it ok to create an object from it?

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• Is passing a struct value to a method by-reference in C# an acceptable optimization?

  - by Arc

  Say I have a struct: struct MyStruct { public int X public int Y } And a method in some class that is iterated over many times elsewhere: public bool MyMethod( MyStruct myStruct ) { return ... } Is changing the MyMethod signature to the following an acceptable optimization? public bool MyMethod( ref MyStruct myStruct ) If so, how much of an advantage would it really be? If not, about how many fields would a struct need for a big enough advantage using ref this way?

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• how to run if(!User.IsAuthenticated) or access Profile.values in App_Code? c# .NET

  - by korben

  i'm trying to run a conditional statement in a class i'm placing in my App_Code folder the condition is whether the person is logged in or not. I normally have two ways to do this in my masterpage and ASPX's if (!User.IsAuthenticated) or if(Profile.username = "anonymous") however neither of these things seem available to me in the .cs i'm making. anyone know what i'm missing? maybe a using namespace up top?

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• Python using methods from other classes

  - by James

  If I have two classes, and one of them has a function that I want to use in my other class, what do I use so that I don't have to rewrite my function?

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• Learning Recommendations? Classroom? Tutorials?

  - by cdg

  Hi there. Does anyone have any recommendations for a class (online) or tutorial that teaches android programing for dummies? It's frustrating knowing exactly what you want to do and no idea how to do it. Something that uses basic language and explains each line in detail to help a person remember how to do it later. Any suggestions would be great. Thanks.

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• Array in element of object

  - by auto2000

  Why in example 'mytest' isn't an array? class myclass { public $mytest = array(); } $insert = new myclass; $insert -> mytest = Array (15, 50);

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