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by: Dave |
last post by:
What is the expected output of this program and why???
#include <iostream>
using namespace std;
class base
{
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by: Maurice Termeer |
last post by:
Hi, suppose i've got this:
class a {
public:
int n;
};
class b : public a {
public:
};
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by: verec |
last post by:
One problem I've come accross in designing a specific version of auto_ptr
is that I have to disntiguish between "polymorphic" arguments and "plain" ones,
because the template has to, internally, cast to void *.
Specifically,
template <typename T> void f(T * t) {
void * p = dynamic_cast<void *>(t) ;
}
will not compile if T isn't of a...
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by: verec |
last post by:
Last week I asked here how I could detect that a T was polymorphic, and
received
very thoughtful and useful replies that I used straight away. Thanks to all who
answered.
This week, it turns out that detecting whether T is polymorphic clashes with
a new requirement, that T be allowed to not be complete.
Last week, this code used to...
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by: Mr. Ed |
last post by:
I have a base class which has about 150 derived classes. Most of the
derived classes are very similar, and many don't change the base class
at all. All the derived classes have a unique factory method which
returns a new object of the derived type.
The problem I've got is that I now need to polymorphically clone a
derived class object, but...
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by: James Fortune |
last post by:
In response to different users or situations (data context) I
transform the appearance and characteristics of Access Forms through
code. This seems to fit in with the idea of polymorphism. Do people
consider Access Forms to be Polymorphic?
James A. Fortune
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by: Jedrzej Miadowicz |
last post by:
I have a problem when using ISynchronizeInvoke.BeginInvoke with polymorphic
parameters. It seems that if I try to call BeginInvoke and in the array of
parameters place an object that's derived from a base class my method
expects as a parameter, the method gets only an object of the type of the
base class, rather than my full object.
I know...
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by: Bob |
last post by:
Hi,
'Shadowed' properties are not polymorphic. (See thread 'Inheritance and late
binding')
They should be.
Problem:
Base class has read only property 'X'.
Derived class must have read / write property 'X'.
Can't override Base class 'X' because of different structure.
So you Shadow the base class 'X' in the derived class.
Pass an instance...
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by: Osamede.Zhang |
last post by:
Compiler store a pointer table in each object with virtual fuction to
implement polymorphic,isn't it? But where is the pointer table?
It seems that object only store a pointer to the table,the output of
this code is 88.
#include<iostream>
using namespace std;
class MyClass{
public:
MyClass(){ a=0;}
virtual void tst1() {a-=1;}
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by: Arindam |
last post by:
#include <cstdio>
struct Test {
void bar() {
foo();
}
private:
virtual void foo() {
printf("Test\n");
}
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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...
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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...
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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. ...
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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...
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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...
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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...
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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...
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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...
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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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