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Swift - class method which must be overridden by subclass

Is there a standard way to make a "pure virtual function" in Swift, ie. one that must be overridden by every subclass, and which, if it is not, causes a compile time error? ...
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What is the difference between JOIN and UNION?

What is the difference between JOIN and UNION ? Can I have an example? 15 Answers 1...
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Auto detect mobile browser (via user-agent?) [closed]

How can I detect if a user is viewing my web site from a mobile web browser so that I can then auto detect and display the appropriate version of my web site? ...
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Web Application Problems (web.config errors) HTTP 500.19 with IIS7.5 and ASP.NET v2

This is driving the whole team crazy. There must be some simple mis-configured part of IIS or our Web Server, but every time we try to run out ASP.NET Web Application on IIS 7.5 we get the following error... ...
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Code for a simple JavaScript countdown timer?

I want to use a simple countdown timer starting at 30 seconds from when the function is run and ending at 0. No milliseconds. How can it be coded? ...
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If my interface must return Task what is the best way to have a no-operation implementation?

In the code below, due to the interface, the class LazyBar must return a task from its method (and for argument's sake can't be changed). If LazyBar s implementation is unusual in that it happens to run quickly and synchronously - what is the best way to return a No-Operation task from the method...
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Get month name from Date

How can I generate the name of the month (e.g: Oct/October) from this date object in JavaScript? 34 Answers ...
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Globally override key binding in Emacs

How can I set a key binding that globally overrides and takes precedence over all other bindings for that key? I want to override all major/minor mode maps and make sure my binding is always in effect. ...
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How to convert string representation of list to a list?

I was wondering what the simplest way is to convert a string list like the following to a list : 15 Answers ...
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How do I alias commands in git?

I saw a screencast where someone had gotten 22 Answers 22 ...