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by: Marcin Vorbrodt |
last post by:
Taken out of C++ In a Nutshell book...
Example 7-18: Using an abstract classes as interface specification.
struct Runnable {
virtual void run() = 0;
};
struct Hashable {
virtual size_t hash() = 0;
};
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by: Stub |
last post by:
Please answer my questions below - thanks!
1. Why "Derived constructor" is called but "Derived destructor" not in Case
1 since object B is new'ed from Derived class?
2. Why "Derived destructor" is called in Case 2 since only ~base() becomes
"virtual" and ~Derived() is still non-virtual?
3. Does Case 3 show that we don't need any virtual destructor to make
~Derived() called?
4. Is "virtual destructor" needed only for Case 2?
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by: iceColdFire |
last post by:
Hi @all,
I am trying to include struct and class objects in a union ,like
class A{
int a;
A(){}
};
struct B
{
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by: Ken Durden |
last post by:
I am in search of a comprehensive methodology of using these two
object cleanup approaches to get rid of a number of bugs,
unpleasantries, and cleanup-ordering issues we currently have in our
4-month old C#/MC++ .NET project project.
I'd like to thank in advance anyone who takes the time to read and/or
respond to this message. At a couple points, it may seem like a rant
against C# / .NET, but we are pretty firmly stuck with this approach...
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by: Peter Oliphant |
last post by:
I'm programming in VS C++.NET 2005 using cli:/pure syntax. In my code I have
a class derived from Form that creates an instance of one of my custom
classes via gcnew and stores the pointer in a member. However, I set a
breakpoint at the destructor of this instance's class and it was never
called!!! I can see how it might not get called at a deterministic time. But
NEVER?
So, I guess I need to know the rules about destructors. I would...
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by: gurry |
last post by:
Suppose there's a class A. There's another class called B which looks
like this:
class B {
private:
A a;
public :
B() { a.~A() }
}
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by: kasiyil |
last post by:
Hello,
I have a question about constructors and destructors in C++. Assume
that I declared a class that has a constructor and virtual destructor
like below:
class X {
X() { printf ("Hi\n"); }
virtual ~X() { }
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by: Richard |
last post by:
First question - let's get this out of the way since it might be the
solution to all my woes: Does it make sense to have a .cpp file for a
class that is declared as having pure virtual functions in its .h file?
Here's my predicament. I'll put this in general terms since it's
happening across several classes.
I have a base class, let's say it's named A. In A.h I DECLARE several
pure virtual ( = 0) functions, a virtual destructor, and...
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by: Ben Voigt |
last post by:
I have a POD type with a private destructor. There are a whole hierarchy of
derived POD types, all meant to be freed using a public member function
Destroy in the base class. I get warning C4624. I read the description,
decided that it's exactly what I want, and ignored the warning.
Now I'm trying to inherit using a template. Instead of "destructor could
not be generated because a base class destructor is inaccessible", I now
have an...
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by: johnsonlau |
last post by:
When a class derives from a class,
You can use a pointer to the parent class to delete the instance of
child
only when a virtual destructor declared in the parent.
class Parent
{
virtual ~Parent(); // virtual destructor
}
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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...
|
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: 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...
|
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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