For now, don’t trust autocomplete to insert the code you need — it drops in signatures from the “header”, but a block signature is not the same as the declaration you need when inserting your own closure for a block parameter. The formal way to write a closure would be to replicate the signature inside … Read more
This is a hard problem indeed. One of the things you need to do is tell java that you are using an enum. This is by stating that you extend the Enum class for your generics. However this class doesn’t have the values() function. So you have to take the class for which you can … Read more
The best solution is usually to use the RemoveAll() method: myList.RemoveAll(x => x.SomeProp == “SomeValue”); Or, if you need certain elements removed: MyListType[] elems = new[] { elem1, elem2 }; myList.RemoveAll(x => elems.Contains(x)); This assume that your loop is solely intended for removal purposes, of course. If you do need to additional processing, then the … Read more
As of Xcode 7 beta 5 (Swift version 2) you can now print type names and enum cases by default using print(_:), or convert to String using String‘s init(_:) initializer or string interpolation syntax. So for your example: enum City: Int { case Melbourne = 1, Chelyabinsk, Bursa } let city = City.Melbourne print(city) // … Read more
This question suits one of my old notes. I hope this illustration helps:
For those lured here by title: yes, you can define your own methods in your enum. If you are wondering how to invoke such non-static method, you do it same way as with any other non-static method – you invoke it on instance of type which defines or inherits that method. In case of enums … Read more
The map method takes an enumerable object and a block, and runs the block for each element, outputting each returned value from the block (the original object is unchanged unless you use map!): [1, 2, 3].map { |n| n * n } #=> [1, 4, 9] Array and Range are enumerable types. map with a … Read more
To add to @StackedCrooked answer, you can overload operator++, operator– and operator* and have iterator like functionality. enum Color { Color_Begin, Color_Red = Color_Begin, Color_Orange, Color_Yellow, Color_Green, Color_Blue, Color_Indigo, Color_Violet, Color_End }; namespace std { template<> struct iterator_traits<Color> { typedef Color value_type; typedef int difference_type; typedef Color *pointer; typedef Color &reference; typedef std::bidirectional_iterator_tag iterator_category; }; … Read more
There’s not really a good way to do this, usually you see an extra item in the enum, i.e. enum foobar {foo, bar, baz, quz, FOOBAR_NR_ITEMS}; So then you can do: int fuz[FOOBAR_NR_ITEMS]; Still not very nice though. But of course you do realize that just the number of items in an enum is not … Read more
~ is the unary one’s complement operator — it flips the bits of its operand. ~0 = 0xFFFFFFFF = -1 in two’s complement arithmetic, ~x == -x-1 the ~ operator can be found in pretty much any language that borrowed syntax from C, including Objective-C/C++/C#/Java/Javascript.