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by: mescaline |
last post by:
//Consider the simple program with inheritance, plain init for A, copy ctr for B
#include <iostream>
using namespace std;
class Base{
public:
Base(){cout << "Base, default" << endl;}
Base(const Base &){cout << "Base, Copy Ctor" << endl;}
};
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by: rKrishna |
last post by:
I was trying to understand the real need for copy constructors. From
literature, the main reason for redfinition of copy constructor in a
program is to allow deep copying; meaning ability to make copies of
classes with members with static or dynamic memory allocation. However
to do this it requires the programmer to override the default copy
constructor, the destructor & operator=.
I wrote a small program to test if i can doa deep copy...
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by: nagrik |
last post by:
Hello group,
Last week I picked up a thread, which pointed out that if a copy
constructor is created with pointers
instead of reference, there is a danger of it going in infinite
recursion.
My observation:
1. Compiler does not complain.
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by: blangela |
last post by:
2.0 Sample Code
class ABC // dummy class used below
{};
class Example2
{
public:
Example2(); // default ctor
Example2( const Example2 &); // copy ctor
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by: blangela |
last post by:
3.0 Advanced Topic Addendum
There are a few cases where the C++ compiler cannot provide an
overloaded assignment operator for your class. If your class contains
a const member or/and a reference member, the compiler will not be able
to synthesize an assignment operator for your class. It actually helps
to think of a reference member as a const member (since it cannot be
made to reference any other object once it has been initialized).
...
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by: campos |
last post by:
"Effective C++ 3rd Edition" Item 6, P39
-------------------------------------------------------
class Uncopyable {
protected: // allow construction
Uncopyable() {} // and destruction of
~Uncopyable() {} // derived objects...
private:
Uncopyable(const Uncopyable&); // ...but prevent copying
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by: subramanian100in |
last post by:
If we provide any ctor for a class the compiler does not supply the
default ctor.
However if we do not provide the copy ctor but provide any other ctor,
the compiler still supplies the copy ctor.
Why doesn't the compiler supply the default ctor but still supplies
the copy ctor when we have defined any other ctor ?
Kindly explain
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by: Subramanian India |
last post by:
If we do not provide any ctor for a class, the compiler provides the default ctor and copy ctor if needed.
Consider a class Test.
Suppose we provide some ctor in class Test but do not provide the default ctor.
Suppose we try to create
Test obj;
Here the default ctor is needed and the compiler does not provide the default ctor but generates a compilation error.
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by: puzzlecracker |
last post by:
From my understanding, if you declare any sort of constructors,
(excluding copy ctor), the default will not be included by default. Is
this correct?
class Foo{
public:
Foo(int); // no Foo() is included, i believe.
};
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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: 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: 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: muto222 |
last post by:
How can i add a mobile payment intergratation into php mysql website.
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