mixins

I'd like to use a Mixin to always add some init functionality to my child classes which each inherit from different API base classes. Specifically, I'd like to make multiple different child classes that inherit from one of these different API-supplied base classes and the one Mixin, which will always have the Mixin initialization code executed in the same way, without code replication. However, it seems that the __init__ function of the Mixin class never gets called unless I explicitly call it in the Child class's __init__ function, which is less than ideal. I've built up a simple test case:

I have just come across this keyword C++ Mixin-Style , do anyone know what this is? In this post , is has been answered as a design pattern. Is it the same design pattern as described in this document ? Mixins are a concept from Lisp. A good explanation from Dr. Dobbs : A mixin is a fragment of a class in the sense that it is intended to be composed with other classes or mixins. [...] The difference between a regular, stand-alone class (such as Person) and a mixin is that a mixin models some small functionality slice (for example, printing or displaying) and is not intended for standalone use.

What is the difference between Mixins and Traits? According to Wikipedia , Ruby Modules are sort of like traits. How so? Mixins may contain state, (traditional) traits don't. Mixins use "implicit conflict resolution", traits use "explicit conflict resolution" Mixins depends on linearization, traits are flattened. Lecture about traits ad 1. In mixins you can define instance variables. Traits do not allow this. The state must be provided by composing class (=class using the traits) ad 2. There may be the name conflict. Two mixins ( MA and MB ) or traits ( TA and TB ) define method with the same

Is it possibile to add span3 class in a mixin to avoid putting it in every element in my HTML? Something like: .myclass { .span3; // other rules... } EDIT I apologize I forgot to specify an important detail: span3 is a standard class of Bootstrap. I didn't find its definition in any file of the Bootstrap framework. ScottS New Answer (requires LESS 1.4.0) What you actually desire is something known as extending in LESS and SASS terminology. For example, you want an HTML element (just an example)... <div class="myclass"></div> ...to fully behave as if it had a span3 class from bootstrap added to

I've been using the module pattern for a while, but recently have started wanting to mix in functions and properties into them to increase code re-use. I've read some good resources on the subject, but still am a bit uncertain as to the best approach. Here is a module: var myModule = function () { var privateConfigVar = "Private!"; //"constructor" function module() {} module.publicMethod = function () { console.log('public'); } function privateMethod1() { console.log('private'); } return module; } And here is a mixin object: var myMixin = function () {}; Mixin.prototype = { mixinMethod1:

I am writing a @mixin with some math in it that calculates the percentage width of an element, but since it is very useful I would like to use the same function for other properties too, like margins and paddings. Is there a way to pass the property name as an argument to a mixin? @mixin w_fluid($property_name, $w_element,$w_parent:16) { $property_name: percentage(($w_element/$w_parent)); } rcorbellini You need to use interpolation (eg. #{$var} ) on your variable in order for Sass to treat it as a CSS property. Without it, you're just performing variable assignment. @mixin w_fluid($property

Using Java 6, how can I implement a mixin ? It is very easy and possible in Ruby. How can I get similar in Java? You could use CGLIB for that. The class Mixin is able to generate a dynamic class from several interfaces / object delegates: static Mixin create(java.lang.Class[] interfaces, java.lang.Object[] delegates) static Mixin create(java.lang.Object[] delegates) static Mixin createBean(java.lang.Object[] beans) I'd say just use object composition. Every time you want to throw in new functionality, compose another object into the class as a member. If you want to make all of your mixed-in

I've heard that it's possible with extension methods, but I can't quite figure it out myself. I'd like to see a specific example if possible. Thanks! It really depends on what you mean by "mixin" - everyone seems to have a slightly different idea. The kind of mixin I'd like to see (but which isn't available in C#) is making implementation-through-composition simple: public class Mixin : ISomeInterface { private SomeImplementation impl implements ISomeInterface; public void OneMethod() { // Specialise just this method } } The compiler would implement ISomeInterface just by proxying every member