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by: cppaddict |
last post by:
Hi,
I know that it is illegal in C++ to have a static pure virtual method,
but it seems something like this would be useful when the following 2
conditions hold:
1. You know that every one of your Derived classes will need to
implement some method, but implement it differently, and that the base
class cannot implement it. This is where pure virtual comes in.
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by: away |
last post by:
Why some classes are seen to has their constructors declared as "protected"?
Thanks!
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by: Chris Capel |
last post by:
What is the rationale behind the decision not to allow abstract static class
members? It doesn't seem like it's a logically contradictory concept, or
that the implementation would be difficult or near-impossible. It seems like
it would be useful. In fact, there's a place in my code that I could make
good use of it. So why not?
Chris
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by: William Stacey |
last post by:
I know the following is not allowed, but shouldn't it be? sharedObject is
part of Derived and should be able to be set in the constructor - no? tia
public abstract class Base1
{
protected readonly object sharedObject;
}
public class Derived : Base1
{
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by: Sunny |
last post by:
Hi all,
According C# Language Specification :
10.11 Static constructors:
The static constructor for a class executes at most once in a given
application domain. The execution of a static constructor is triggered
by the first of the following events to occur within an application
domain:
- An instance of the class is created.
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by: Kirk Marple |
last post by:
Just want to see if this is 'by design' or a bug...
I have a common List<T> defined in a base class, and the base class has a
static property to expose this list.
I wanted the derived class to add items to this list, but have the base
class hold the data and expose the property.
Problem is, however, that the derived class' static constructor doesn't get
called when DerivedClass.MyList is accessed, so the list has no members. If
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by: Picho |
last post by:
Hi all,
I popped up this question a while ago, and I thought it was worth checking
again now... (maybe something has changed or something will change).
I read this book about component oriented design (owreilly - Juval Lowy),
and it was actually very nice.
The book goes on about how we should use Interfaces exposure instead of
classes (this is my terminology and english is not my language so I hope you
understand what I'm on about...).
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by: knocte |
last post by:
Hello.
I have a problem with C# language. I want to define an algorithm on a
static function inside an abstract class. This function calls a static
variable inside the same class. Then I want to define some derived
classes wich inherit the function and override the variable, but it
doesn't work.
Testcase:
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by: Hemanth |
last post by:
Hi,
I have a base class with a static constructor and some abstract methods.
Derived classes implement these methods. From articles on the web, it appears
that there is no guarentee that this static constructor of the base class
would be invoked even if a an object of the derived class is created. Is this
correct ? Is there any way to ensure the base class's static constructor is
invoked before the derived class instance is constructed ?...
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by: cmonthenet |
last post by:
Hello,
I searched for an answer to my question and found similar posts,
but none that quite addressed the issue I am trying to resolve.
Essentially, it seems like I need something like a virtual static
function (which I know is illegal), but, is there a way to provide
something similar? The class that is the target of my inquiry is a
template class that interfaces to one of several derived classes
through a pointer to a base class. The...
|
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...
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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,...
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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...
|
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...
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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();...
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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...
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by: adsilva |
last post by:
A Windows Forms form does not have the event Unload, like VB6. What one acts like?
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by: bsmnconsultancy |
last post by:
In today's digital era, a well-designed website is crucial for businesses looking to succeed. Whether you're a small business owner or a large corporation in Toronto, having a strong online presence can significantly impact your brand's success. BSMN Consultancy, a leader in Website Development in Toronto offers valuable insights into creating effective websites that not only look great but also perform exceptionally well. In this comprehensive...
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