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by: Martin Koller |
last post by:
Hi list,
I have a small example which gives me "pure virtual function called".
I'm calling a virtual function in the destructor of the base class, where
the pointer used is effectively pointing to a derived class, but the whole
thing is in the process of being destroyed.
Interesting for me is also, that I get the same error if I call b->isA() in
the constructor of Base.
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by: Ele |
last post by:
Is it correct to say that Whenever a class has a virtual member function,
define its destructor as "virtual"?
Can a destructor as "pure virtual"? When is it needed to do so?
For an interface, Interf:
class Interf
{
public:
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by: qazmlp |
last post by:
When a member function is declared as virtual in the base class, the
derived class versions of it are always treated as virtual.
I am just wondering, why the same concept was not used for the
destructors.
What I am expecting is, if the destructor is declared as virtual in
base, the destructors of all its derived classes also should be
virtual always.
What exactly is the reason for not having it so?
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by: qazmlp |
last post by:
I have a class like this:
class base
{
public:
virtual ~base() throw();
// Other members
};
Now, if I write a class like this:
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by: WittyGuy |
last post by:
Hi,
I wonder the necessity of constructor and destructor in a Abstract
Class? Is it really needed?
?
Wg
http://www.gotw.ca/resources/clcm.htm for info about ]
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by: arun |
last post by:
Hello Group,
I have a class A, which has three other members and each member is of a
different class
type.
If I don't create a destructor then the compiler will give me one and
whenever class A is
destroyed (whether on stack or on heap) the destructor of each
different object will be called.
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by: eric |
last post by:
hello
i'm confused by an example in the book "Effective C++ Third Edition"
and would be grateful for some help. here's the code:
class Person {
public:
Person();
virtual ~Person(); // see item 7 for why this is virtual
...
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by: Pallav singh |
last post by:
Hi All
How Does compiler implement virtual destructor ???
as we all know if base class destructor is virtual..........then while
wriiting statemnt like this
Base * b = new Derived( );
delete b;
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by: Tonni Tielens |
last post by:
I'm trying to create a pure virtual class describing an interface.
Normally, when I do this I make the destructor pure virtual so that,
even if there are no members in the class, it cannot be instantiated.
The difference now is that I'm making a generic interface with
template arguments. Template classes should be defined in the header
file, but it is not allowed for a destructor's definition to be in the
class definition if 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: 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...
|
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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: agi2029 |
last post by:
Let's talk about the concept of autonomous AI software engineers and no-code agents. These AIs are designed to manage the entire lifecycle of a software development project—planning, coding, testing, and deployment—without human intervention. Imagine an AI that can take a project description, break it down, write the code, debug it, and then launch it, all on its own....
Now, this would greatly impact the work of software developers. The idea...
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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...
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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: 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
|
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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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