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by: Michael Young |
last post by:
I've been trying to compile code similar to the example code below,
but I keep getting errors indicating that the function 'foo()' is not
accessible. At first, I thought this was a bug in the compiler, but
I've now tried the code against Borland C++ Builder 6.0, MS VC++ .NET,
DevC++ (GCC), and Comeau's on-line compiler, and all give me similar
diagnositic messages.
I can make the code work if I make the "protected" items "public" in...
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by: Steve Canfield |
last post by:
When compiling the following code:
class Base
{
...
virtual void Fn(int x);
virtual void Fn(Base x);
};
class Derived : public Base
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by: Siemel Naran |
last post by:
Can Derived class static member access protected member from base class?
class Base {
protected:
void setvariable(int);
};
class Derived : Base {
public:
static std::auto_ptr<Base> out(new Derived());
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by: John B |
last post by:
I have a variable in a base class defined as:
protected Control validationControl;
How can I ensure that it is set is any dervied classes. I see that you
cannot set variables to abstract.
Thanks
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by: Taran |
last post by:
Hi All,
I tried something with the C++ I know and some things just seem
strange.
consider:
#include <iostream>
using namespace std;
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by: Dave Booker |
last post by:
It looks like the language is trying to prevent me from doing this sort of
thing. Nevertheless, the following compiles, and I'd like to know why it
doesn't work the way it should:
public class ComponentA
{
static string s_name = "I am the root class.";
public string Name { get {return s_name;} }
}
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by: Bob Johnson |
last post by:
I have a base class that must have a member variable populated by, and only
by, derived classes.
It appears that if I declare the variable as "internal protected" then the
base class *can* populate the variable, but the population is not *required*
by the derived class (which must be the case).
What would meet the requirements is if I create an abstract method in the
base class that populates the member variable. In this case the...
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by: Rahul |
last post by:
Hi Everyone,
I was just playing around virtual functions and landed up with the
following,
class Base1
{
public: virtual void sample()
{
printf("base::sample\n");
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by: blangela |
last post by:
If I pass a base class object by reference (likely does not make a
difference here that it is passed by reference) as a parameter to a
derived class member function, the member function is not allowed to
access the protected data members of the base object. This surprises
me.
Can someone explain why this is? I suspect there is a good reason and
I am just having a slow day to not come up with it myself.
Bob
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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: 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: 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: 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: muto222 |
last post by:
How can i add a mobile payment intergratation into php mysql website.
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