traits

I have this repetitive piece of code that will be used in more than one entity in my Symfony2 project so will be fine to apply some kind of DRY, if it's possible of course, and I'm thinking in PHP Traits . private static $preDeletedEntities;// static array that will contain entities due to deletion. private static $deletedEntities;// static array that will contain entities that were deleted (well, at least the SQL was thrown). /** * This callback will be called on the preRemove event * @ORM\PreRemove */ public function entityDueToDeletion() { // This entity is due to be deleted though not

To make it simple, I have noticed that PHP doesn't seem to offer any magic constant for determining what the name that a trait has been changed to in a class. Since this sounds confusing to me in words, I will give an example, as it is rather easy and would expect it to be somewhere in the new PHP 5.5, I don't see a way to doing it. So here it is: Say we have some class, that uses some trait that conflicts with some function inside the class, example: class SomeClass { use \Name\Space\SomeTrait { SomeFunction as private NewFunctionName; } function SomeFunction() { $this->NewFunctionName(); } }

I used use the keyword "use" generally above the class definition. Like this: <?php namespace suites\plugins\content\agpaypal; use \Codeception\Util\Fixtures; use \Codeception\Verify; use \Codeception\Specify; class agpaypalTest extends \Codeception\Test\Unit { protected $tester; ... But now I realised, that I have to put the line for the trait Specify into the class definition. Like this: <?php namespace suites\plugins\content\agpaypal; use \Codeception\Util\Fixtures; use \Codeception\Verify; class agpaypalTest extends \Codeception\Test\Unit { use \Codeception\Specify; protected $tester; ...

So, I was trying to make a finagle server, talk to sentry (not important), and stumbled upon a case, where I needed to inherit from two classes (not traits) at the same time, let's call them class SentryHandler extends Handler and class TwitterHandler extends Handler , and assume, that I need to create MyHandler , that inherits from both of them. After a moment of stupidity, when I thought it was impossible without using a dreaded "delegation pattern", I found a solution: trait SentryTrait extends SentryHandler class MyHandler extends TwitterHandler with SentryTrait Now, this got me thinking:

I have a trait trait B { type Index: Sized + Copy; fn bounds(&self) -> (Self::Index, Self::Index); } I want to get all the Index es within bounds : fn iterate<T: B>(it: &T) { let (low, high) = it.bounds(); for i in low..high {} } This won't work since there's no constraint that the type T can be "ranged" over, and the compiler says as much: error[E0277]: the trait bound `<T as B>::Index: std::iter::Step` is not satisfied --> src/main.rs:8:5 | 8 | for i in low..high {} | ^^^^^^^^^^^^^^^^^^^^^ the trait `std::iter::Step` is not implemented for `<T as B>::Index` | = help: consider adding a `where

Consider this kind of problem. I have a Base class and three classes derived from Base . For instance: DerivedA , DerivedB and DerivedC . Each derived class has its unique container. Hence DerivedA has std::vector<int> , DerivedB has std::set<int> and DerivedC has std::map<int, std::string> . And I want an interface in Base to access the container of derived class on which it is currently pointed to. Base* d1 = new DerivedA; for(std::vector<int>::iterator iter = d1->begin(); iter != d1->end(); ++iter) { //processing } I tried to wrap each container to separate class and keep a pointer of their

My program contains mayavi, traits and pyqt5 elements in order to visualize something in 3D. I tried to convert my GUI-Application with cx_Freeze and it created the exe-file ,but running it I got the error: no traitsui.toolkits plugin found for toolkit qt4 After some google and stackoverflow research I figured out that it might has something to do with my environment: see creating standalone exe using pyinstaller with mayavi import According to the suggestions in further google research I added these lines to the top of my code: import imp try: imp.find_module('pyside') # test if PySide if

I am stumbling on something that I hope is a bit of a basic issue. Probably its because I am new to Scala, and probably I am still missing some important concepts. I am trying to program in an FP fashion, and data classes which do not need to have a mutable state are immutable, with some transformation methods to create new objects to update them if needed. However, I am struggling when it comes to maintaining the return types of this method when I have traits and general inheritance in place. I wish to avoid messy type casts or things like that as much as possible, because this is still a