Suppose there is a class called "Class_A", it has a member function called "func". I want the "func" to do some extra work by wrapping Class_A in a decorator class. $worker = new Decorator(new Original()); Can someone give an example? I've never used OO with PHP. ======================================================= Thank you g...
I am trying to implement infer_class function that, given a method, figures out the class to which the method belongs. So far I have something like this: import inspect def infer_class(f): if inspect.ismethod(f): return f.im_self if f.im_class == type else f.im_class # elif ... what about staticmethod-s? else: ...
How do I find out which class I am initialising a decorator in? It makes sense that I wouldn't be able to find this out as the decorator is not yet bound to the class, but is there a way of getting round this? class A(object): def dec(f): # I am in class 'A' def func(cls): f(cls) return func @dec...
I'm implementing a decorator pattern in Javascript. I've seen the example here in Wikipedia // Class to be decorated function Coffee() { this.cost = function() { return 1; }; } // Decorator A function Milk(coffee) { this.cost = function() { return coffee.cost() + 0.5; }; } // Decorator B function Whip(coffee) { ...
I would like to wrap form elements with labels as such <label for="email">E-mail <input type="text" name="email" id="email" /></label> The only option I could find is to alter the placement; however it only accepts 'prepend' and 'append': <!-- prepend --> <label for="email">E-mail</label> <input type="text" name="email" id="email" />...
I've noticed that on all the examples that illustrate the decorator pattern, there is a base class/interface and there is a decorator class that inherits/implements it, after which, all the decorated classes extend the decorator class. Something along the following lines : Interface Window > WindowDecorator > WindowDecorator > VerticalS...
I've used Tiles and Sitemesh for a number of years and while I personally prefer the Sitemesh style page decoration, I generally don't see a lot of mention of Sitemesh or Tiles on the Internet. Do people use Tiles and/or Sitemesh actively, or are there other libraries that have taken over in this capacity? ...
I am trying to write a "login_required" decorator for the views in a WSGI+Werkzeug application. In order to do this, I need to get at the user's session, which is accessible via the Request object that is passed into the view methods. I can't figure out how to get at that instance of Request in the decorator, though. I looked at PEP318...
I recently started experimenting with Python decorators (and higher-order functions) because it looked like they might make my Django unit tests more concise. e.g., instead of writing: def visit1(): login() do_stuff() logout() I could instead do @handle_login def visit1(): do_stuff() However, after some experimentin...
I'm excited to see the latest version of the decorator python module (3.0). It looks a lot cleaner (e.g. the syntax is more sugary than ever) than previous iterations. However, it seems to have lousy support (e.g. "sour" syntax, to horribly stretch the metaphor) for decorators that take arguments themselves. Does anyone have a good ex...
I will go straight to the example: class Foo: @execonce def initialize(self): print 'Called' >>> f1 = Foo() >>> f1.initialize() Called >>> f1.initialize() >>> f2 = Foo() >>> f2.initialize() Called >>> f2.initialize() >>> I tried to define execonce but could not write one that works with methods. PS: I cannot define the code ...
I'd like to write a decorator that would limit the number of times a function can be executed, something along the following syntax : @max_execs(5) def my_method(*a,**k): # do something here pass I think it's possible to write this type of decorator, but I don't know how. I think a function won't be this decorator's first argum...
I'm considering the use of C++ for a personal project. I would like to make it platform independent (no Mono please, since some platforms don't yet support it), and that's why I considered C++. I have one doubt, however. I've grown quite fond of C#'s attributes, and I would like to know if I can use something similar in C++. Also, is i...
I'm having trouble using python function decorators in Google's AppEngine. I'm not that familiar with decorators, but they seem useful in web programming when you might want to force a user to login before executing certain functions. Anyway, I was following along with a flickr login example here that uses django and decorates a func...
Why does this not work? How can I make it work? That is, how can I make gu accessible inside my decorated function? def decorate(f): def new_f(): def gu(): pass f() return new_f @decorate def fu(): gu() fu() Do I need to add gu to a dictionary of defined functions somehow? Or can I add gu t...
Let's say I have the following: def with_connection(f): def decorated(*args, **kwargs): f(get_connection(...), *args, **kwargs) return decorated @with_connection def spam(connection): # Do something I want to test the spam function without going through the hassle of setting up a connection (or whatever the decora...
I have a struts2-spring application which works fine in jetty server but when i try migrating it to WAS 6 the decorator(sitemesh) is not getting applied. The server logs shows no error.Is this a known issue ? my web.xml looks like this <filter> <filter-name>action2-cleanup</filter-name> <filter-class>org.apache.struts2.dispatch...
I had got a following case of circular import (here severly simplified): array2image.py conversion module: import tuti @tuti.log_exec_time # can't do that, evaluated at definition time def convert(arr): '''Convert array to image.''' return image.fromarray(arr) tuti.py test utils module: import array2image def log_exec_time...
How can I use a class instance variable as an argument for a method decorator in Python? The following is a minimal example shows what I'm trying to do. It obviously fails as the decorator function does not have access to the reference to the instance and I have no idea how to get access to the reference from the decorator. def decorato...
I am using the decorator pattern and am decorating a class with a constructor that has parameters. Below is the constructor of the class decorating; Public Sub New(ByVal repository As ISchedulingRespository) Me.repository = repository End Sub Because my decorator class inherits from the decorated class I need to declare it's co...