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What is the copy-and-swap idiom?

...s arguably the most nuanced and difficult. How should it be done? What pitfalls need to be avoided? The copy-and-swap idiom is the solution, and elegantly assists the assignment operator in achieving two things: avoiding code duplication, and providing a strong exception guarantee. How does it wor...
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What's the difference between dist-packages and site-packages?

I'm a bit miffed by the python package installation process. Specifically, what's the difference between packages installed in the dist-packages directory and the site-packages directory? ...
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What is the simplest way to convert a Java string from all caps (words separated by underscores) to

The title pretty much says it all. What's the simplest/most elegant way that I can convert, in Java, a string from the format "THIS_IS_AN_EXAMPLE_STRING" to the format " ThisIsAnExampleString "? I figure there must be at least one way to do it using String.replaceAll() and a regex. ...
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static files with express.js

...ic')); }); server.listen(3000); The trick is leaving this line as last fallback server.use(express.static(__dirname + '/public')); As for documentation, since Express uses connect middleware, I found it easier to just look at the connect source code directly. For example this line shows th...
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How to force ASP.NET Web API to always return JSON?

... use this method but the one below using GlobalConfiguration...Clear() actually works. – seangwright May 7 '15 at 20:52 add a comment  |  ...
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Android Studio says “cannot resolve symbol” but project compiles

...alidate and Restart" option to fix this. EDIT 2: This fix should work for all similar incidents and is not a twitter4j specific resolution. share | improve this answer | fol...
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What does 'super' do in Python?

... What's the difference? SomeBaseClass.__init__(self) means to call SomeBaseClass's __init__. while super(Child, self).__init__() means to call a bound __init__ from the parent class that follows Child in the instance's Method Resolution Order (MRO). If the instance is a subclass of ...
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Can you grab or delete between parentheses in vi/vim?

...isual mode, then you specify that you want to go 2 levels of parens up. Finally the a) selects "a block". After that you can use d or x to delete, etc. If you don't want to include the outer parens, you can use "inner block" instead: v2i) See :help object-select for the complete list of related ...
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How do I access the request object or any other variable in a form's clean() method?

... but how can I access the request object? Can I modify the clean method to allow variables input? 11 Answers ...
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Express-js can't GET my static files, why?

... In case of new install you should verify that your express module is properly installed (expressjs.com/en/starter/installing.html) then you should check the path and your directory name like Giacomo said ;) – Spl2nky ...