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Difference between virtual and abstract methods [duplicate]

... Virtual methods have an implementation and provide the derived classes with the option of overriding it. Abstract methods do not provide an implementation and force the derived classes to override the method. So, abstract methods have no actual code in them, and...
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How to forward declare a template class in namespace std?

and used that function in my main. I get errors. Of course, I know that there are more template params for std::list (allocator I think). But, that is beside the point. Do I have to know the full template declaration of a template class to be able to forward declare it? ...
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py2exe - generate single executable file

...so that will explain some of the os.system calls i'm using. First I tried converting all my images into bitmats and then all my data files into text strings. but this caused the final exe to be very very large. After googleing for a week i figured out how to alter py2exe script to meet my needs. ...
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C# Error: Parent does not contain a constructor that takes 0 arguments

...arameterless parent constructor inserted. That constructor does not exist, and so you get that error. To correct the situation, you need to add an explicit call: public Child(int i) : base(i) { Console.WriteLine("child"); } Or, you can just add a parameterless parent constructor: protected ...
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How to determine device screen size category (small, normal, large, xlarge) using code?

... To get x-large detection, make sure you use target android-3.0 in your project. Or use the static value 4 for x-large. – Peterdk Oct 14 '11 at 16:19 ...
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Readonly Properties in Objective-C?

... Eiko and others gave correct answers. Here's a simpler way: Directly access the private member variable. Example In the header .h file: @property (strong, nonatomic, readonly) NSString* foo; In the implementation .m file: /...
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how to set textbox value in jquery

...d. $(selector).load() returns the a jQuery object. By default an object is converted to [object Object] when treated as string. Further clarification: Assuming your URL returns 5. If your HTML looks like: <div id="foo"></div> then the result of $('#foo').load('/your/url'); wi...
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ASP.NET MVC Relative Paths

...("~/Scripts/jquery-1.2.6.js")%>"></script> Or use MvcContrib and do this: <%=Html.ScriptInclude("~/Content/Script/jquery.1.2.6.js")%> share | improve this answer | ...
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Why use the yield keyword, when I could just use an ordinary IEnumerable?

...azy. Only, it requires far less compiler generated custom ---gunk--- code. And less developer time writing and maintaining. (Of course, that was just this example) – sehe Dec 28 '12 at 11:57 ...
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Can git automatically switch between spaces and tabs?

... That way: each time you checkout some files of your repo, spaces can be converted in tabs, but when you check-in (and push and publish), those same files are stored back using only spaces. You can declare this filter driver (named here 'tabspace') in the .git/info/attributes (for a filter appl...