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Reference - What does this error mean in PHP?

...ile programming PHP and have no clue how to fix them. This is also a Community Wiki, so everyone is invited to participate adding to and maintaining this list. ...
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How to convert linq results to HashSet or HashedSet

... I don't think there's anything built in which does this... but it's really easy to write an extension method: public static class Extensions { public static HashSet<T> ToHashSet<T>( this IEnumerable<T> source, IEqualityComparer<T> comparer = n...
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Pointers in C: when to use the ampersand and the asterisk?

I'm just starting out with pointers, and I'm slightly confused. I know & means the address of a variable and that * can be used in front of a pointer variable to get the value of the object that is pointed to by the pointer. But things work differently when you're working with arrays, string...
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How to stop line breaking in vim

... lines visually, i.e. the line is still one line of text, but Vim displays it on multiple lines. Use :set nowrap To display long lines as just one line (i.e. you have to scroll horizontally to see the entire line). shar...
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self referential struct definition?

I haven't been writing C for very long, and so I'm not sure about how I should go about doing these sorts of recursive things... I would like each cell to contain another cell, but I get an error along the lines of "field 'child' has incomplete type". What's up? ...
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Multiple left-hand assignment with JavaScript

...follow | edited Aug 30 '17 at 9:44 Jonathan 1,73511 gold badge1414 silver badges3131 bronze badges ...
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Calling remove in foreach loop in Java [duplicate]

In Java, is it legal to call remove on a collection when iterating through the collection using a foreach loop? For instance: ...
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UI Design Pattern for Windows Forms (like MVVM for WPF)

MVVM is most commonly used with WPF because it is perfectly suited for it. But what about Windows Forms? Is there an established and commonly used approach / design pattern like this for Windows Forms too? One that works explicitly well with Windows Forms? Is there a book or an article that describe...
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How to use PrimeFaces p:fileUpload? Listener method is never invoked or UploadedFile is null / throw

...ut the general browser behavior is unspecified and dependent on form composition and webbrowser make/version. Just always specify it to be on the safe side. When using mode="advanced" (i.e. ajax upload, this is the default), then make sure that you've a <h:head> in the (master) template. This ...
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Recursively counting files in a Linux directory

...ndard input. wc (short for word count) counts newlines, words and bytes on its input (docs). -l to count just newlines. Notes: Replace DIR_NAME with . to execute the command in the current folder. You can also remove the -type f to include directories (and symlinks) in the count. It's possible ...