473,721 Members | 1,716 Online
Bytes | Software Development & Data Engineering Community
+ Post

Home Posts Topics Members FAQ

Partial Classes - Aspects

I'm currently writing a small toy application to support symbolic
algebra. Therefore I implemented some classes Term, Var, Number, Sum,
Product, Power. These classes are tightly coupled. So it is not
possible to organize them in distinct files. This would result in
cyclic imports.

To manage the complexity I implemented some sort of aspect oriented
programming (perhaps aspect oriented programming is not quite right in
this context...). That is I implemented a mechanism to dynamically add
methods to existing classes. This is similar to the thread "Partial
classes" discussed in this list. Therefore hereby offer some use case
for partial classes.

The aspects I already implemented are amongst others: pretty printing,
differentiation , expansion of terms. The aspect for expansion looks
like this:
# -*- coding: iso-8859-1 -*-
__aspect__ = "Expand"

class TermExpand:
def expand(self):
return self

class SumExpand:
def expand(self):

def expandSum(term, sum):
# some helper function

class ProductExpand:
def expand(self):

class PowerExpand:
def expand(self):

The code to import an aspect into existing classes accepts as a
parameter the name of a module. The module will be imported.
Afterwards the code iterates over all elements defined in the module.
If it is a (specially named) class all methods will be copied to the
original class. If it is a (top level) function it will be copied into
the global namespace. E.g. the method expand of the class TermExpand
will be copyied to the base class Term.

The difficulty with this approach is that the classes' methods and the
functions do operate in the wrong global namespace. Since these
functions/methods are located in their own module they get their own
namespace. To correct this I have to use new.function() to create new
methods/functions with the correct namespace (which is the base
module's namespace).

So my questions boil down to this:

* Do you think this is a sound approach to structure my code?
* I don't like the necessity to modify the functions. Is there a
simpler approach?


Jul 29 '06 #1
0 1379

This thread has been closed and replies have been disabled. Please start a new discussion.

Similar topics

by: nospam | last post by:
I got three (3) files (1) Untitled.aspx (2) Untitled.aspx.1.cs (3) Untitled.aspx.2.cs These three files must be used together to make file #1, Untitled.aspx, page work via J.I.T. when the User first hits Internet Explorer 6.0 on your browser.
by: Gomaw Beoyr | last post by:
Two question about the "partial classes" (in the next wersion of ..NET). Question 1 ========== Will partial classes (in the next version of C#) have to be declared "partial" in ALL places. I.e. do we have to need to write:
by: pawel.pabich | last post by:
Hajo, I would like to have 2 my own partial classes. For example: Default.aspx.cs Default2.aspx.cs and they both will relate to Default.aspx page.
by: ptass | last post by:
Hi In asp.net 2.0 an aspx files .cs file is a partial class and all works fine, however, I thought I’d be able to create another class file, call it a partial class and have that compile and load as a 3rd partial class. This would be handy so i can generate standard code into one of the partial classes, while having my custom code untouched
by: Bishoy George | last post by:
In a web application using asp.net 2.0 All my classes are partial classes. - I noticed that partial class cannot be inherited... is that true? - I tried to remove the partial keyword , and I receieved this error Error 1 Missing partial modifier on declaration of type 'NagyResearch.Q_A.Q.QuestionnairePage'; another partial declaration of this type exists D:\Web Sites\Local
by: Fat Elvis | last post by:
I'd like to extend some of my Asp.net pages by using Partial Classes. Example ASP.Net Page: public partial class Admin_Customer : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { Data_List(); } }
by: Sagar | last post by:
I am working on a migration project for a huge asp.net application now running in framwework 1.1 to dotnet 2.0 As a first step, I opened the .sln files of the project in VS.Net 2005. The Conversion wizard created partial classes off the existing classes. Is partial classes mandatory in VS.Net 2005 or can I still work without having to live with partial classes ?
by: Peted | last post by:
Hi, im moving a project from vs2005 to vs 2008. is doing so i have come across a compiler error regarding partial classes that i dont understand if anyone can explain it to me please the orig defintion that compiles and runs fine in vs2005 is bellow......
by: JDeats | last post by:
So I have a class that spans over two partial classes in code, here's an example (do not read much into this, the code is of no practical use, this is just a simple example of where my confusion occurs). // Inside SharedClassExample1.cs public partial class SharedClassExample { public List<stringBooksOnShelf { get; set; } public List<stringBooksOnDesk { get; set; }
by: marktang | last post by:
ONU (Optical Network Unit) is one of the key components for providing high-speed Internet services. Its primary function is to act as an endpoint device located at the user's premises. However, people are often confused as to whether an ONU can Work As a Router. In this blog post, we’ll explore What is ONU, What Is Router, ONU & Router’s main usage, and What is the difference between ONU and Router. Let’s take a closer look ! Part I. Meaning of...
by: Hystou | last post by:
Most computers default to English, but sometimes we require a different language, especially when relocating. Forgot to request a specific language before your computer shipped? No problem! You can effortlessly switch the default language on Windows 10 without reinstalling. I'll walk you through it. First, let's disable language synchronization. With a Microsoft account, language settings sync across devices. To prevent any complications,...
by: jinu1996 | last post by:
In today's digital age, having a compelling online presence is paramount for businesses aiming to thrive in a competitive landscape. At the heart of this digital strategy lies an intricately woven tapestry of website design and digital marketing. It's not merely about having a website; it's about crafting an immersive digital experience that captivates audiences and drives business growth. The Art of Business Website Design Your website is...
by: Hystou | last post by:
Overview: Windows 11 and 10 have less user interface control over operating system update behaviour than previous versions of Windows. In Windows 11 and 10, there is no way to turn off the Windows Update option using the Control Panel or Settings app; it automatically checks for updates and installs any it finds, whether you like it or not. For most users, this new feature is actually very convenient. If you want to control the update process,...
by: tracyyun | last post by:
Dear forum friends, With the development of smart home technology, a variety of wireless communication protocols have appeared on the market, such as Zigbee, Z-Wave, Wi-Fi, Bluetooth, etc. Each protocol has its own unique characteristics and advantages, but as a user who is planning to build a smart home system, I am a bit confused by the choice of these technologies. I'm particularly interested in Zigbee because I've heard it does some...
by: conductexam | last post by:
I have .net C# application in which I am extracting data from word file and save it in database particularly. To store word all data as it is I am converting the whole word file firstly in HTML and then checking html paragraph one by one. At the time of converting from word file to html my equations which are in the word document file was convert into image. Globals.ThisAddIn.Application.ActiveDocument.Select();...
by: TSSRALBI | last post by:
Hello I'm a network technician in training and I need your help. I am currently learning how to create and manage the different types of VPNs and I have a question about LAN-to-LAN VPNs. The last exercise I practiced was to create a LAN-to-LAN VPN between two Pfsense firewalls, by using IPSEC protocols. I succeeded, with both firewalls in the same network. But I'm wondering if it's possible to do the same thing, with 2 Pfsense firewalls...
by: adsilva | last post by:
A Windows Forms form does not have the event Unload, like VB6. What one acts like?
by: 6302768590 | last post by:
Hai team i want code for transfer the data from one system to another through IP address by using C# our system has to for every 5mins then we have to update the data what the data is updated we have to send another system

By using Bytes.com and it's services, you agree to our Privacy Policy and Terms of Use.

To disable or enable advertisements and analytics tracking please visit the manage ads & tracking page.