language-construct

This question already has an answer here: When should I use the java 5 method cast of Class? 5 answers Java Class.cast() vs. cast operator 8 answers I recently stumbled upon a piece of code that went like this: Object o = .. ; Foo foo = Foo.class.cast(o); I was actually not even aware that java.lang.Class had a cast method, so I looked into the docs, and from what I gather this does simply do a cast to the class that the Class object represents. So the code above would be roughly equivalent to Object o = ..; Foo foo = (Foo)o; So I wondered, why I would want to use the cast method instead of

Background: I was "dragged" into seeing this question: Fibonacci's Closed-form expression in Haskell when the author initially tagged with many other languages but later focused to a Haskell question. Unfortunately I have no experience whatsoever with Haskell so I couldn't really participate in the question. However one of the answers caught my eye where the answerer turned it into a pure integer math problem. That sounded awesome to me so I had to figure out how it worked and compare this to a recursive Fibonacci implementation to see how accurate it was. I have a feeling that if I just

In JavaScript ES6, there is a language feature known as destructuring . It exists across many other languages as well. In JavaScript ES6, it looks like this: var animal = { species: 'dog', weight: 23, sound: 'woof' } //Destructuring var {species, sound} = animal //The dog says woof! console.log('The ' + species + ' says ' + sound + '!') What can I do in C++ to get a similar syntax and emulate this kind of functionality? For the specific case of std::tuple (or std::pair ) objects, C++ offers the std::tie function which looks similar: std::tuple<int, bool, double> my_obj {1, false, 2.0}; //

I think that shadow variables are too dangerous to use them. Why does Scala support this language construct? There should be some strong reason for that, but I cant find it. Just as a reminder: A variable, method, or type is said to shadow another variable, method, or type of the same name when it is declared in an inner scope, making it impossible to refer to the outer-scope entity in an unqualified way (or, sometimes, at all). Scala, just like Java, allows shadowing. One possible reason I could see is that in Scala, it is frequent to have many nested scopes, each of which is relatively short

Possible Duplicate: What are the PHP operators “?” and “:” called and what do they do? From http://twitto.org/ <?PHP require __DIR__.'/c.php'; if (!is_callable($c = @$_GET['c'] ?: function() { echo 'Woah!'; })) throw new Exception('Error'); $c(); ?> Twitto uses several new features available as of PHP 5.3: The DIR constant The ?: operator Anonymous functions What does number 2 do with the ?: in PHP 5.3? Also, what do they mean by anonymous functions? Wasn't that something that has existed for a while? Ben James ?: is a form of the conditional operator which was previously available only as:

I've been puzzling about this for a while and I've looked around a bit, unable to find any discussion about the subject. Lets assume I wanted to implement a trivial example, like a new looping construct: do..until Written very similarly to do..while do { //Things happen here } until (i == 15) This could be transformed into valid csharp by doing so: do { //Things happen here } while (!(i == 15)) This is obviously a simple example, but is there any way to add something of this nature? Ideally as a Visual Studio extension to enable syntax highlighting etc. Microsoft proposes Rolsyn API as an