[Dev-C++] Strange effect - The end

[Ioannis V. <no...@ya...>]

Finally i agree with you. You are right, every member function has only
one instance. I understood it indirectly, from the way pointers to
member functions work. Well although i thought i know much about C++,
probably there are details i miss. :)
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Ioannis
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* Ioannis Vranos
* Programming pages: http://www.noicys.f2s.com
<http://www.noicys.f2s.com/>=20
* Alternative URL: http://run.to/noicys
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-----Original Message-----
From: dev...@li...
[mailto:dev...@li...] On Behalf Of Jason
Hardman
Sent: Tuesday, October 23, 2001 5:32 AM
To: Dev-C++
Subject: Re: [Dev-C++] Strange effect


I'm glad someone else agrees with me. :)
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Now onto the static issue, "In C++, when static is used on a class
*data* member, it causes only one copy of that member to be shared by
all objects of its class", (C/C++ Programmer's Reference, second edition
- Herbert Schildt).
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"Member functions may also be declared as static. There are several
restrictions placed on static member functions. They may only directly
refer to other static members of the class. (Of course, global functions
and data my be accessed by static member functions.) A static member
function does not have a this pointer....", (C++ The Complete Reference,
Third Edition - Herbert Schildt, p.315). The reason that a static member
can't access non-static members is because it doesn't have a this
pointer and has no frame of reference to get to the data, but a static
data member is a single defined instance which therefore has a specific
place in memory that can be directly refered to. There still only needs
to be one copy of the member function. In the end a static member is a
special case used to overcome specific problems.
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Jason.
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----- Original Message -----=20

From: Daniel  <mailto:sp...@ho...> Glenfield=20
To: dev...@li...=20
Sent: Monday, October 22, 2001 9:48 PM
Subject: RE: [Dev-C++] Strange effect






objects have their own data members, they share the member functions in
the class they are a part of. They do not have their own functions, this
I am sure of.



>From: "Ioannis Vranos"=20
>To: "Dev-C++"=20
>Subject: RE: [Dev-C++] Strange effect=20
>Date: Mon, 22 Oct 2001 23:43:25 +0200=20
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>:) That every object has its own data members whhich these functions=20
>manipulate. Except of that, for what static data members and static=20
>member functions exist for?=20
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>Ioannis=20
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>* Ioannis Vranos=20
>* Programming pages: http://www.noicys.f2s.com=20
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>* Alternative URL: http://run.to/noicys=20
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>-----Original Message-----=20
>From: dev...@li...=20
>[mailto:dev...@li...] On Behalf Of Daniel=20
>Glenfield=20
>Sent: Monday, October 22, 2001 10:30 PM=20
>To: dev...@li...=20
>Subject: RE: [Dev-C++] Strange effect=20
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>I am 100% certain that each object does NOT have it's own copy of the=20
>member functions. What reason would there be?=20
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> >From: "Ioannis Vranos"=20
> >To: "Dev-C++"=20
> >Subject: RE: [Dev-C++] Strange effect=20
> >Date: Mon, 22 Oct 2001 22:44:21 +0200=20
> >=20
> >I do not think this is true. Every object has its own member
functions.=20
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> >Except of that, here wrong data members are being created too.=20
> >=20
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> >Ioannis=20
> >=20
> >* Ioannis Vranos=20
> >* Programming pages: http://www.noicys.f2s.com=20
> >=20
> >* Alternative URL: http://run.to/noicys=20
> >=20
> >=20
> >-----Original Message-----=20
> >From: dev...@li...=20
> >[mailto:dev...@li...] On Behalf Of
Daniel=20
> >Glenfield=20
> >Sent: Monday, October 22, 2001 7:56 PM=20
> >To: dev...@li...=20
> >Subject: RE: [Dev-C++] Strange effect=20
> >=20
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> >An object holds it's own data members but does not have it's own copy

>of=20
> >member functions - there is one instance of a member function that is

> >used by all (since it does not change, while data members do).=20
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> _____=20
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