traits

I'd like to write a library that's a thin wrapper around some of the functionality in BTreeMap . I'd prefer not to tightly couple it to that particular data structure though. Strictly speaking, I only need a subset of its functionality, something along the lines of the NavigableMap interface in Java. I was hoping to find an analogous trait I could use. I seem to recall that at some point there were traits like Map and MutableMap in the standard library, but they seem to be absent now. Is there a crate that defines these? Or will they eventually be re-added to std? No, right now there's only

I am wondering what the semantics of using the abstract keyword in combination with a trait is. If the trait does not define any abstract methods, the abstract keyword does not prevent me from creating an instance: scala> abstract trait T defined trait T scala> new T{} res0: java.lang.Object with T = $anon$1@12cd927d On the other hand, if the trait does define an abstract method, I cannot create an instance (without implementing this method of course) no matter if the abstract keyword is present or not: scala> abstract trait T { def foo : Unit } defined trait T scala> new T{} <console>:9:

What I did so far: I am pretty familiar with CI, but new to composer and the twilio SDK. Reading some tutorials and docs I managed to install composer and the twilio package. However the /vendor folder is parallel to my CI installation: /var/www/html/ - application - system - vendor I have therefore edited the config.php setting the path like this: $config['composer_autoload'] = '/var/www/html/vendor/autoload.php'; In my controller tried to use the SDK as documented in the Twilio SDK: <?php defined('BASEPATH') OR exit('No direct script access allowed'); class Test extends CI_Controller { use

The following code attempts (without using c++11) to create a trait for identifying whether a type is iterable in STL fashion : #include <iostream> #include <vector> template<typename C> struct IsIterable { typedef char true_type; typedef long false_type; template<class T> static true_type is_beg_iterable( typename T::const_iterator = C().begin()); template<class T> static false_type is_beg_iterable(...); enum { value = sizeof(is_beg_iterable<C>()) == sizeof(true_type) }; }; int main() { std::cout << IsIterable<std::vector<int>>::value << std::endl; } there's also an is_end_iterable method,

I'm looking for ideas on how to implement a Mixin/Trait style system in AS3. I want to be able to compose a number of classes together into a single object. Of course this is not a language level feature of AS3, but I'm hoping that there is maybe some way to do this using prototype based techniques or maybe some bytecode hacking that I believe AsMock uses to implement it's functionality. An existing Java example is Qi4J where the user define interfaces that the Qi4j framework implements based on metadata tags and coding by convention. Has anyone any ideas on how to get the Mixin/Trait concept

I have some structs that implement both Hash and MyTrait . I'm using them as &MyTrait trait objects. Now I want &MyTrait to also implement Hash . I've tried a few things: Naively, trait MyTrait: Hash {} : the trait `MyTrait` cannot be made into an object Then I tried this: impl Hash for MyTrait { fn hash<H: Hasher>(&self, hasher: &mut H) { // ... } } but I need to delegate to the hash method of the concrete type of self , I think. So the naive next step is to put this on MyTrait : fn my_hash<H: Hasher>(&self, hasher: &mut H); which brings me right back to the first point. I read something