Hi, i have a question about C++. Is it possible to declare a class with a member ot the same class?
I don't think you can. Think about it: Wouldn't that class inside the class, also have a class inside the class? Which would also have a class inside the class. etc. etc. etc. If you want different things to have different members, they have to be different structures.
This doesn't even work in C. Observe:
will give an error since you can't nest that way.
You can cheat by using a pointer. The compiler will let you make pointers to incomplete types since a pointer's always the same size.
That way it only allocates the size of the pointer, not the entire struct, avoiding the infinite recursion. This means you have to explicitly allocate memory to it later to use it, of course.
Hello,
i am using the sigaction function to handle the SIGCHLD signal.Is it possible to use a class member function as the handler function (the sa_handler member of the sigaction structure)?
The function's signature is:
void (*sa_handler)(int);so i don't think i can use a static member function... (2 Replies)
im just trying to have some fun and kill some time writing a c++ program that has a person type in a car make and model then gives them a year and a price. or something like that. i always have problems getting it goin but once the ball is rolling im usually pretty good. anyone wanna help me out? ... (1 Reply)
I have the following class and thought that when I call the set command to set a member, I always use value. Would that be fine?
class ModMisfit {
protected:
Real dtau;
Real mdacc;
Real mindist;
bool hw;
Source** src;
public:
void ... (7 Replies)
Hi,
I believe the next code is wrong:
class Egg {
Egg e;
int i;
Egg(int ii=0) : i(ii) {}
};
because you would end up with an endless definition (memory allocation) of Egg objects, thus int i.
Ok, so God Eckel proposes for a singleton:
class Egg {
static Egg e;
int... (5 Replies)
Hi all!
I am trying to register a device in an existing device class, but I am
having trouble getting the pointer to an existing class.
I can create a class in a module, get the pointer to it and then use
it to register the device with:
*cl = class_create(THIS_MODULE, className);... (0 Replies)
I have the two class definition as follows.
class A { public: int a; };
class B : virtual public A{ };
The size of class A is shown as 4, and size of class B is shown as 16. Why is this effect ?. (2 Replies)
There is base class B, and two derived classes D1 and D2 derived from Base. Base class B, have two data members ( public or protected or private or if any). D1 should inherit both these data members, and D2 should be deriving only one member from Base class. Is this kind of design possible without... (1 Reply)
Hello All,
I am a learner in C++. I was testing my inheritance knowledge with following piece of code.
#include <iostream>
using namespace std;
class base
{
public :
void display()
{
cout << "In base display()" << endl;
}
void display(int k)
{... (2 Replies)