number of children exist?

[cmk128]

Hi
I have a mother class, and a child class. Can i know how man object
of child exist from the mother class?

thanks
from Peter (cm****@hotmail.com)

[Victor Bazarov]

cm****@hotmail.com wrote:

Hi
I have a mother class, and a child class. Can i know how man object
of child exist from the mother class?

The "mother class" (whatever you mean by it) should have either a record
or a memory about giving birth to each "child". Counting the records or
remembering (extracting from memory) should give you the child count.

In any way, C++ has no concept of "mother" or "child". What exactly do
you mean by those?

V
--
Please remove capital 'A's when replying by e-mail
I do not respond to top-posted replies, please don't ask

[Phlip]

cmk128 wrote:

I have a mother class, and a child class. Can i know how man object
of child exist from the mother class?

Please post some code. The jargon "mother" and "child" can mean many
different things.

If you mean "base" and "derived classes", you can't know the number.

--
Phlip
http://c2.com/cgi/wiki?ZeekLand <-- NOT a blog!!!

[osmium]

<cm****@hotmail.comwrote:

I have a mother class, and a child class. Can i know how man[y]
object[s]
of child exist from the mother class?

Add a protected data member to the base class. In the constructor for the
derived class, increment the count contained in the parent. If you're a
worry wart you can make it more complicated.

[cmk128]

osmium 寫�：

<cm****@hotmail.comwrote:

I have a mother class, and a child class. Can i know how man[y]
object[s]
of child exist from the mother class?

Add a protected data member to the base class. In the constructor for the
derived class, increment the count contained in the parent. If you're a
worry wart you can make it more complicated.

Thanks osmimum
Instead of a count, can i add give the pointer of the current
object of the drived class to it's parent class? So the parent class
can reference all their child class's object?

thanks
from Peter

[osmium]

<cm****@hotmail.comwrote:

I have a mother class, and a child class. Can i know how man[y]
object[s]
of child exist from the mother class?

Add a protected data member to the base class. In the constructor for the
derived class, increment the count contained in the parent. If you're a
worry wart you can make it more complicated.

Instead of a count, can i add give the pointer of the current
object of the drived class to it's parent class? So the parent class
can reference all their child class's object?

I don't know of any reason that couldn't be done. It's getting complicated
enough that I would put a member function in the base class to handle the
details of adding. The function would add the newly received pointer to a
stack or vector of such pointers.