473,883 Members | 1,628 Online
Bytes | Software Development & Data Engineering Community
+ Post

Home Posts Topics Members FAQ

Circular dependencies

Hi everybody:

I'm implementing a general C++ framework and I have a basic question
about circular dependencies:

I am creating a base class Object, my Object class has a method
defined as:
virtual String toString();

where String is defined as:

class String : public Object

This is similar to the Java or .NET Object class implementation, but
it
is not a good OO design because the circular dependency between my
Object and my String classes.

There are another ways to implement this functionality without having
circular
dependencies?

Best regards

ernesto
Jul 22 '05 #1
2 3108
On 29 Nov 2004 07:40:16 -0800, oo******@gmail. com (ernesto basc?n
pantoja) wrote:
Hi everybody:

I'm implementing a general C++ framework and I have a basic question
about circular dependencies:

I am creating a base class Object, my Object class has a method
defined as:
virtual String toString();

where String is defined as:

class String : public Object

This is similar to the Java or .NET Object class implementation, but
it
is not a good OO design because the circular dependency between my
Object and my String classes.

There are another ways to implement this functionality without having
circular
dependencies ?


Yes ... use std::string, or don't make your String an Object, but a
stand-alone class.

--
Bob Hairgrove
No**********@Ho me.com
Jul 22 '05 #2
"ernesto basc?n pantoja" <oo******@gmail .com> wrote in message news:7a******** *************** ***@posting.goo gle.com...
Hi everybody: Hi.
I'm implementing a general C++ framework and I have a basic question
about circular dependencies:

I am creating a base class Object, my Object class has a method
defined as:
virtual String toString();

where String is defined as:

class String : public Object

This is similar to the Java or .NET Object class implementation, but it
is not a good OO design because the circular dependency between my
Object and my String classes.
I have never heard of this precept before, and I doubt that it is
a generally held view. In fact, I think it is rare for frameworks
to be designed without any circular dependency whatsoever.
There are another ways to implement this functionality without having
circular dependencies?


You have set out "this functionality" as:
(1) an object hierarchy with a single root
(2) any object can be converted to a "String"
(3) a "String" is part of the object hierarchy
That inherently has some circularity, hence circular dependency.
So I have to say, "No there are no other ways to implement that
functionality without some degree of circular dependency." The
issue is not implementation; it is your requirements.

I suggest simply dropping the "not a good OO design" notion.
If you have a specific C++ question about how to declare and
define classes with circular dependency(s), you are welcome
to pose them. C++ provides ways to accomplishing that.

--
--Larry Brasfield
email: do************* **********@hotm ail.com
Above views may belong only to me.
Jul 22 '05 #3

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

Similar topics

12
5266
by: jinal jhaveri | last post by:
Hi All, I have one question regarding circular inheritance I have 3 files 1) A.py , having module A and some other modules 2) B.py having module B and some other modules 3) C.py having module C and some other modules
8
2060
by: Tim Tyler | last post by:
Like C, Python seems to insist I declare functions before calling them - rather than, say, scanning to the end of the current script when it can't immediately find what function I'm referring to. C lets you predeclare functions to allow for the existence of functions with circular dependencies. Does Python allow you to do something similar? If not how do you create functions with circular dependencies in
1
2107
by: Henry Miller | last post by:
I have the following code (much simplified for this post). Note that SessionKey uses DataAccess, and DataAccess requires SessionKey in it's constructor. Public Class SessionKey Public IsValidSession as Boolean Sub New(UserName, Password) ' Create session, including calls on DataAccess ' to validate username/password
3
2907
by: Keith F. | last post by:
Visual Studio doesn't allow circular references between projects. I have a situation where I need to allow 2 projects to reference each other. Is there any way to make Visual Studio allow this? I realize the best way is to restructure the solution so the circular reference isn't necessary, which I intend to do. But at the moment, I'm looking for a quicker work-around if there is one. Thanks.... Keith F.
7
13533
by: barias | last post by:
Although circular dependencies are something developers should normally avoid, unfortunately they are very easy to create accidentally between classes in a VS project (i.e. circular compile-time dependencies). But then I started wondering how "easy" it would be to similarly make a NON-RUNTIME circular dependency between (implicitly linked) DLLs. Indeed authors like John Lakos, who focus on compile/link-time dependencies (not run-time),...
8
4160
by: nyhetsgrupper | last post by:
I have written a windows service and want to expose a web based user interface for this service. I then wrote a class library containing a ..net remoting server. The class library have a method named StartRemotingServer(). To be able to call this method from the windows service I need to reference the remoting class library, but for the class library to be able to access the internal structures of the windows service the class library...
3
7065
by: donnyma | last post by:
I have a problem that looks like it has not been discussed before in these groups. I have a simple SQLAgent job that runs sp_who (could be anything, but let's just say sp_who for this example). I have set the jobstep to write to an output file "T:\out.txt". If the job is owned by an admin, it runs fine and writes the output file. If it is owned by a non-admin user, it gets the following error msg: Warning: cannot write logfile...
5
3405
by: =?Utf-8?B?Qm9i?= | last post by:
I have a table of dependencies and want to check to see if the dependencies cause a circular reference. Any sugesstions on how to do this using c#. Example, ID DependsOnID 1 2 1 4 2 3 3 1 (circular reference)
6
3479
by: Mosfet | last post by:
Hi, I have two classes, let's call them class A and class B with mutual dependencies as shown below and where implementation is inside .h (no cpp) #include "classB.h" class A {
0
9940
marktang
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...
0
9792
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,...
0
11142
Oralloy
by: Oralloy | last post by:
Hello folks, I am unable to find appropriate documentation on the type promotion of bit-fields when using the generalised comparison operator "<=>". The problem is that using the GNU compilers, it seems that the internal comparison operator "<=>" tries to promote arguments from unsigned to signed. This is as boiled down as I can make it. Here is my compilation command: g++-12 -std=c++20 -Wnarrowing bit_field.cpp Here is the code in...
1
10847
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,...
0
10415
tracyyun
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...
1
7971
isladogs
by: isladogs | last post by:
The next Access Europe User Group meeting will be on Wednesday 1 May 2024 starting at 18:00 UK time (6PM UTC+1) and finishing by 19:30 (7.30PM). In this session, we are pleased to welcome a new presenter, Adolph Dupré who will be discussing some powerful techniques for using class modules. He will explain when you may want to use classes instead of User Defined Types (UDT). For example, to manage the data in unbound forms. Adolph will...
0
7128
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();...
0
5797
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...
1
4612
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.