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by: pw4getter |
last post by:
Is there any rationale to prohibit implicit conversion from derived** to base** ?
To illustrate my question I submit couple lines below:
class base
{
public:
base(){}
virtual ~base(){}
};
class derived: public base
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by: Mark McDonald |
last post by:
This question kind of follows on from Mike Spass’ posting 10/11/2004; I don’t
understand why you can’t declare an implicit operator to convert a base class
to a derived class.
The text books say “neither the source nor the target types of a conversion
can be a base type of the other, since a conversion would then already
exist”. But this is not really true, whilst automatic (implicit) conversions
do occur from the derived...
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by: Brian Henry |
last post by:
If i inherite a queue class into my class, and do an override of the enqueue
member, how would i then go about actually doing an enqueue of an item? I am
a little confused on this one... does over ride just add aditional code
ontop of the current class or completely over ride it in vb? I am use to C++
this is the first inherited thing I've done in VB.NET... I'm a little unsure
of diffrences, could someone explain this to me some? thanks!
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by: anongroupaccount |
last post by:
What measures should be taken to avoid this sort of thing?
class Base
{
};
class Derived1 : public Base
{
private:
int i, j, k;
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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: olanglois |
last post by:
Hi,
I am not sure if I have found a compiler bug (I am using VC++.NET2003)
or if this is the correct behavior defined by the language but I am
sure someone can clear up my confusion. Suppose the following:
class Base
{
protected:
int x;
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by: Javier |
last post by:
Hello, is this possible?
I have a pure virtual function in the base class (to force the
programmers of the derived classes to have this function implemented)
but I want to call the derived class function from a base class
reference:
class A
{
public:
virtual void function() = 0;
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by: jan.loucka |
last post by:
Hi,
We're building a mapping application and inside we're using open
source dll called MapServer. This dll uses object model that has quite
a few classes. In our app we however need to little bit modify come of
the classes so they match our purpose better - mostly add a few
methods etc.
Example: Open source lib has classes Map and Layer defined. The
relationship between them is one to many.
We created our own versions (inherited) of Map...
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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: jared.grubb |
last post by:
Can a private Base class method convert to/from a Derived* using
static_cast? The CPL book says that a Derived method is allowed to
convert to/from Base, but says nothing about whether a Base method may
do the same thing.
My embedded compiler and g++ disagree on whether this is legal.
Example:
class Base { public: void foo(); };
class Derived : private Base { public: void foo(); };
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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.
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Your website is...
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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 projectplanning, coding, testing, and deploymentwithout 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 Dupr 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: 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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by: bsmnconsultancy |
last post by:
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