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by: vijay |
last post by:
I have a doubt with size of classed with virtual functions
I have declared A,A1,A2 ,B , C, D some classes with no varaibles but a
vitual function each,
The size of A is as expected 4 bytes with one vtbl ptr
BUt when I derive the class B from class A (both have 1 virtual function
each ) the size remains still as 4 bytes .
class A = 4 bytes
class B :public A = 4 bytes
class...
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by: Ryan Faulkner |
last post by:
Hi,
Im having a few problems with virtual functions (Im using the Visual C++
environment by the way). I have a base class with three virtual functions
and a derived class with a single new virtual function plus redefinitions of
the three inherited virtual functions.
Following is a simplified code fragment to illustrate my code and my
problem:
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by: PengYu.UT |
last post by:
Hi,
It seems that the line with "//no error" and "//error" are the same.
However, the second one give an error.
I'm using g++-3.3.
The error message was:
g++-3.3 -g -c -o main.o main.cc
main.cc: In function `int main(int, char**)':
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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: Nemanja Trifunovic |
last post by:
Something I don't get it:
Say we have:
ref class Base {
virtual void SomeVirtualFunction()
{Console::WriteLine(L"Base");}
public:
void SomeAccessibleFunction()
{SomeVirtualFunction();}
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by: ypjofficial |
last post by:
Hello All,
I have read in many c++ literature that vtable is nothing but an array
of pointer to virtual functions inside a class.And the class where the
virtual function/s are declared stores the vfptr i.e the pointer to
vtable internally.
What confuses me is
if vtable is an array of pointer to virtual functions then as per the
properties of the array all the entries inside the array must be
same.i.e all the pointers should be of similar...
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by: Pravesh |
last post by:
Hello All,
I had some query regarding virtual functions/destructors. If a class is
having some/all of its methods that are virtual then is it recommended
that it should also have virtual destructor?
When I am defining such a class with default destructor then my
compiler is giving warning that class XXX has virtual functions but
non-virtual destructor.
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by: Dave Rahardja |
last post by:
Since C++ is missing the "interface" concept present in Java, I've been using
the following pattern to simulate its behavior:
class Interface0
{
public:
virtual void fn0() = 0;
};
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by: Jess |
last post by:
Hello,
If I have a class that has virtual but non-pure declarations, like
class A{
virtual void f();
};
Then is A still an abstract class? Do I have to have "virtual void
f() = 0;" instead? I think declaring a function as "=0" is the same
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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...
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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...
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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,...
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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: 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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