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Re: How to implement polymorphism using C language

kith_kahnan Posted: Thu Dec 16, 2004 11:51 pm

Joined: 04 Jan 2005

Posts: 13

Re: How to implement polymorphism using C language

----- Original Message -----
From: "N Khemker" <nilesh_ibmr@...>
To: <Programmers-Town@yahoogroups.com>
Sent: Monday, December 13, 2004 8:59 PM
Subject: (PT) How to implement polymorphism using C language

> Hello guys,
> How do i impelement polymorhism using C language,
will anyone tell me Is it possible and if possible than how exactly should
do .
>
> Regards,
> Neel.
>

**************************************************
I think the only polymorphical thing you can do in C is a function
overload...

void function();
void function(int);
void function(int, long, char*);

and so, ad infinitum.

Regards,

Fernando.

sflam108 Posted: Mon Dec 20, 2004 11:21 pm

Joined: 25 Jul 2003

Posts: 48

Re: How to implement polymorphism using C language

Function overload is not present in C. In C, either use different names or
pass a union of supported types (with additional identifier that give hints
of the type to be used).

HTH
Shyan

> -----Original Message-----
> From: Fernando Arturo Gómez Flores [mailto:fernando.gomez@...]
> Sent: Thursday, December 16, 2004 11:51 AM
> To: Programmers-Town@yahoogroups.com
> Subject: Re: (PT) How to implement polymorphism using C language
>
>
> **************************************************
> I think the only polymorphical thing you can do in C is a function
> overload...
>
> void function();
> void function(int);
> void function(int, long, char*);
>
> and so, ad infinitum.
>
> Regards,
>
> Fernando.
>

kchit01 Posted: Wed Dec 22, 2004 8:53 pm

Joined: 22 Dec 2004

Posts: 1

Re: How to implement polymorphism using C language

hi shyan

clarify this doubt of mine regarding fnt overloading

if C does not support function overloading then how come printf() is taking different signatures

chitrakrishnanShyan Lam <sflam@...> wrote:
Function overload is not present in C. In C, either use different names orpass a union of supported types (with additional identifier that give hintsof the type to be used).HTHShyan> -----Original Message-----> From: Fernando Arturo Gómez Flores [mailto:fernando.gomez@...]> Sent: Thursday, December 16, 2004 11:51 AM> To: Programmers-Town@yahoogroups.com> Subject: Re: (PT) How to implement polymorphism using C language> > > **************************************************> I think the only polymorphical thing you can do in C is a function> overload...> > void function();> void function(int);> void function(int, long, char*);> > and so, ad infinitum.> > Regards,> > Fernando.>
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sflam108 Posted: Sat Dec 25, 2004 3:04 am

Joined: 25 Jul 2003

Posts: 48

Re: How to implement polymorphism using C language

Reply embedded...

> From: chitra krishnan [mailto:kchit01@...]
> Sent: Wednesday, December 22, 2004 8:53 AM
> To: Programmers-Town@yahoogroups.com
> Subject: RE: (PT) How to implement polymorphism using C language
>
> hi shyan
>
> clarify this doubt of mine regarding fnt overloading
>
> if C does not support function overloading then how come printf() is
> taking different signatures

Lookup "variadic function", or "functions with variable arguments".

It has nothing to do with function overloading.

HTH
Shyan

ashwin_mittal26 Posted: Mon Dec 27, 2004 11:05 am

Joined: 27 Dec 2004

Posts: 14

Re: How to implement polymorphism using C language

Yah Shyan,

This is the same query which I have asked earlier but
not able to get the answer as my query hasnt been
posted..

Regards
Ashwin Mittal.

--- chitra krishnan <kchit01@...> wrote:

> hi shyan
>
> clarify this doubt of mine regarding fnt overloading
>
> if C does not support function overloading then how
> come printf() is taking different signatures
>
> chitrakrishnan
>
> Shyan Lam <sflam@...> wrote:
> Function overload is not present in C. In C, either
> use different names or
> pass a union of supported types (with additional
> identifier that give hints
> of the type to be used).
>
> HTH
> Shyan
>
>
> > -----Original Message-----
> > From: Fernando Arturo Gómez Flores
> [mailto:fernando.gomez@...]
> > Sent: Thursday, December 16, 2004 11:51 AM
> > To: Programmers-Town@yahoogroups.com
> > Subject: Re: (PT) How to implement polymorphism
> using C language
> >
> >
> > **************************************************
> > I think the only polymorphical thing you can do in
> C is a function
> > overload...
> >
> > void function();
> > void function(int);
> > void function(int, long, char*);
> >
> > and so, ad infinitum.
> >
> > Regards,
> >
> > Fernando.
> >
>
>
>
>
> To unsubscribe :
> programmers-town-unsubscribe@yahoogroups.com
>
>
>
>
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jaspreet.oberoi@... Posted: Mon Dec 27, 2004 11:30 am

Joined: 23 Dec 2004

Posts: 2

Re: How to implement polymorphism using C language

Reply embedded.

Thanks!! and have
a nice day!!
Jaspreet

-----Original Message-----
From: chitra krishnan
[mailto:kchit01@...]
Sent: Wednesday, December 22, 2004
8:23 PM
To:
Programmers-Town@yahoogroups.com
Subject: RE: (PT) How to implement
polymorphism using C language

hi shyan

clarify this doubt of mine regarding fnt overloading

if C
does not support function overloading then how come printf() is taking
different signatures

Jaspreet -> Chitra, the
signature for printf is declared as receiving
variable number of arguments. If you go in the help files to see the signature
for printf it will have a “ “
followed by 3 dots (…). This signifies variable number of arguments.
Search for it on Internet or just see past postings for variable number of
arguments.

chitrakrishnan

Shyan Lam <sflam@...>
wrote:

Function overload is not present in C. In C,
either use different names or
pass a union of supported types (with additional
identifier that give hints
of the type to be used).

HTH
Shyan

> -----Original Message-----
> From: Fernando Arturo Gómez Flores
[mailto:fernando.gomez@...]
> Sent: Thursday, December 16, 2004 11:51 AM
> To: Programmers-Town@yahoogroups.com
> Subject: Re: (PT) How to implement
polymorphism using C language
>
>
>
**************************************************
> I think the only polymorphical thing you can
do in C is a function
> overload...
>
> void function();
> void function(int);
> void function(int, long, char*);
>
> and so, ad infinitum.
>
> Regards,
>
> Fernando.
>

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Thank You.

basavesh123 Posted: Mon Dec 27, 2004 11:37 am

Joined: 27 Dec 2004

Posts: 1

Re: How to implement polymorphism using C language

Hi,
the var args chapter can be found in the Richie & Kernighan book. It is a small chapter, but explained very well.

Bye
Basavesh
Jaspreet Oberoi <jaspreet.oberoi@...> wrote:

Reply embedded.

Thanks!! and have a nice day!!
Jaspreet

-----Original Message-----From: chitra krishnan [mailto:kchit01@...] Sent: Wednesday, December 22, 2004 8:23 PMTo: Programmers-Town@yahoogroups.comSubject: RE: (PT) How to implement polymorphism using C language

hi shyan

clarify this doubt of mine regarding fnt overloading

if C does not support function overloading then how come printf() is taking different signatures

Jaspreet -> Chitra, the signature for printf is declared as receiving variable number of arguments. If you go in the help files to see the signature for printf it will have a “ “ followed by 3 dots (…). This signifies variable number of arguments. Search for it on Internet or just see past postings for variable number of arguments.

chitrakrishnanShyan Lam <sflam@...> wrote:

Function overload is not present in C. In C, either use different names orpass a union of supported types (with additional identifier that give hintsof the type to be used).HTHShyan> -----Original Message-----> From: Fernando Arturo Gómez Flores [mailto:fernando.gomez@...]> Sent: Thursday, December 16, 2004 11:51 AM> To:
Programmers-Town@yahoogroups.com> Subject: Re: (PT) How to implement polymorphism using C language> > > **************************************************> I think the only polymorphical thing you can do in C is a function> overload...> > void function();> void function(int);> void function(int, long, char*);> > and so, ad infinitum.> > Regards,> > Fernando.> To unsubscribe : programmers-town-unsubscribe@yahoogroups.com

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kith_kahnan Posted: Thu Dec 30, 2004 4:28 am

Joined: 04 Jan 2005

Posts: 13

Re: How to implement polymorphism using C language

>
> Function overload is not present in C. In C, either use different names
or
> pass a union of supported types (with additional identifier that give
hints
> of the type to be used).
>
> HTH
> Shyan
>
>

Ah, I disagree. I think C supports function overload. As an example, take
the fcntl function in Linux API. That C-pure POSIX-standard function, used
for locking files, is declared as follows:

#include <unistd.h>
#include <fcntl.h>
int fcntl(int fd, int cmd);
int fcntl(int fd, int cmd, long arg);
int fcntl(int fd, int cmd, struct flock* lock);

I think that is function overloaded. I`m I missing something?

Regards,
Fernando.

> > -----Original Message-----
> > From: Fernando Arturo Gómez Flores
[mailto:fernando.gomez@...]
> > Sent: Thursday, December 16, 2004 11:51 AM
> > To: Programmers-Town@yahoogroups.com
> > Subject: Re: (PT) How to implement polymorphism using C language
> >
> >
> > **************************************************
> > I think the only polymorphical thing you can do in C is a function
> > overload...
> >
> > void function();
> > void function(int);
> > void function(int, long, char*);
> >
> > and so, ad infinitum.
> >
> > Regards,
> >
> > Fernando.
> >
>
>
>
>
> To unsubscribe : programmers-town-unsubscribe@yahoogroups.com
>
>
>
>
>
> ---------------------------------
>
>
> Do you Yahoo!?
> Take Yahoo! Mail with you! Get it on your mobile phone.
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>
>
>
>
>
>
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you receive this message in error, please immediately delete it and all
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shabble Posted: Fri Dec 31, 2004 3:14 pm

Joined: 29 Dec 2004

Posts: 31

Re: How to implement polymorphism using C language

From: "Fernando Arturo Gómez Flores"

>> Function overload is not present in C. In C, either use
>> different names
>> or pass a union of supported types (with additional identifier
>> that give hints of the type to be used).
>>
>> HTH
>> Shyan
>>
>>
>
>Ah, I disagree. I think C supports function overload.

No it doesn`t.

>As an example, take
>the fcntl function in Linux API. That C-pure

Linux API - `C-pure` (what is this?) does not make it Standard C.

>POSIX-standard
>function, used for locking files, is declared as follows:
>
>#include <unistd.h>
>#include <fcntl.h>
>int fcntl(int fd, int cmd);
>int fcntl(int fd, int cmd, long arg);
>int fcntl(int fd, int cmd, struct flock* lock);

If this is how fcntl() is defined in your header files (as opposed to in
comments in your header,) then your compiler should be complaining. If they are
defined, and your compiler isn`t complaining then your compiler is seriously
broken.

>I think that is function overloaded. I`m I missing something?

fcntl() is varadic, and it (at runtime) determines what (if any) the third
arguement is from the second argument.
If that doesn`t appear to make sense, think of printf() and how it might
determine the 2nd, 3rd etc. parameters. (And no, there isn`t a definition of
printf with every permutation of parameters in stdio.h .)

--
PJH

Quantum materiae materietur marmota monax si marmota monax materiam possit
materiari?

Alderley plc, Arnolds Field Estate, The Downs, Wickwar, Gloucestershire, GL12
8JD, UK
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kith_kahnan Posted: Mon Jan 03, 2005 9:06 am

Joined: 04 Jan 2005

Posts: 13

Re: How to implement polymorphism using C language

> -----Mensaje original-----
> De:
> sentto-10171697-4973-1104521971-fernando.gomez=matematicas.net
> @returns.groups.yahoo.com
> [mailto:sentto-10171697-4973-1104521971-fernando.gomez=matemat
> icas.net@...] En nombre de Paul Herring
> Enviado el: Viernes, 31 de Diciembre de 2004 03:14 a.m.
> Para: Programmers-Town@yahoogroups.com
> Asunto: RE: (PT) How to implement polymorphism using C language
>
>
> From: "Fernando Arturo Gómez Flores"
>
> >> Function overload is not present in C. In C, either use
> >> different names
> >> or pass a union of supported types (with additional identifier
> >> that give hints of the type to be used).
> >>
> >> HTH
> >> Shyan
> >>
> >>
> >
> >Ah, I disagree. I think C supports function overload.
>
> No it doesn`t.
>
> >As an example, take
> >the fcntl function in Linux API. That C-pure
>
> Linux API - `C-pure` (what is this?) does not make it Standard C.

Well, I thought that Linux was made in Standard C (that`s what I meant
by `C-pure`, sorry for my inconvenient phrase). I took that from "Linux
Programming Second Edition Unleashed" by Kurt Wall.

> >POSIX-standard
> >function, used for locking files, is declared as follows:
> >
> >#include <unistd.h>
> >#include <fcntl.h>
> >int fcntl(int fd, int cmd);
> >int fcntl(int fd, int cmd, long arg);
> >int fcntl(int fd, int cmd, struct flock* lock);
>
> If this is how fcntl() is defined in your header files (as
> opposed to in comments in your header,) then your compiler
> should be complaining. If they are defined, and your compiler
> isn`t complaining then your compiler is seriously broken.
>

Indeed, when I compile C code in Linux, I use gcc under Fedora Core 3. I
really doubt that the compiler is broken, but it may not follow the
standard though. When I use Microsoft`s Visual Studio .Net 2003, it
throws me a warning when I overload a function.

> >I think that is function overloaded. I`m I missing something?
>
> fcntl() is varadic, and it (at runtime) determines what (if
> any) the third arguement is from the second argument.
> If that doesn`t appear to make sense, think of printf() and
> how it might determine the 2nd, 3rd etc. parameters. (And no,
> there isn`t a definition of printf with every permutation of
> parameters in stdio.h .)
>

So, if I understood, are you saying that fcntl is defined something as:
int fcntl(int fd, int cmd, ...)
as printf?

> --
> PJH
>
> Quantum materiae materietur marmota monax si marmota monax
> materiam possit materiari?
>
>

Thanks for your time spent clearing my doubts. Have a nice year.
Fernando Gomez.

sflam108 Posted: Tue Jan 04, 2005 3:38 am

Joined: 25 Jul 2003

Posts: 48

Re: How to implement polymorphism using C language

Reply embedded...

> -----Original Message-----
> From: Fernando Arturo Gómez Flores [mailto:fernando.gomez@...]
> Sent: Wednesday, December 29, 2004 4:29 PM
> To: Programmers-Town@yahoogroups.com
> Subject: Re: (PT) How to implement polymorphism using C language
>
> Ah, I disagree. I think C supports function overload. As an example, take
> the fcntl function in Linux API. That C-pure POSIX-standard function, used
> for locking files, is declared as follows:

How do you "know" they are declared as such?

>
> #include <unistd.h>
> #include <fcntl.h>
> int fcntl(int fd, int cmd);
> int fcntl(int fd, int cmd, long arg);
> int fcntl(int fd, int cmd, struct flock* lock);
>
> I think that is function overloaded. I`m I missing something?

I think so. How about actually looking how it is defined in the header, or
google?

http://www.opengroup.org/onlinepubs/009695399/functions/fcntl.html

HTH
Shyan

kith_kahnan Posted: Tue Jan 04, 2005 5:51 am

Joined: 04 Jan 2005

Posts: 13

Re: How to implement polymorphism using C language

Reply embedded...

> -----Original Message-----
> From: Fernando Arturo Gómez Flores [mailto:fernando.gomez@...]
> Sent: Wednesday, December 29, 2004 4:29 PM
> To: Programmers-Town@yahoogroups.com
> Subject: Re: (PT) How to implement polymorphism using C language
>
> Ah, I disagree. I think C supports function overload. As an example, take
> the fcntl function in Linux API. That C-pure POSIX-standard function, used
> for locking files, is declared as follows:

How do you "know" they are declared as such?

** Actually from Kurt Wall`s Programming Linux Unleashed, 2 Ed.

>
> #include <unistd.h>
> #include <fcntl.h>
> int fcntl(int fd, int cmd);
> int fcntl(int fd, int cmd, long arg);
> int fcntl(int fd, int cmd, struct flock* lock);
>
> I think that is function overloaded. I`m I missing something?

I think so. How about actually looking how it is defined in the header, or
google?

** Well, actually I didn`t have a doubt on the issue; I was only discussing
the polymorphism issue here.

Regads,
Fernando Gomez.

basraaji Posted: Tue Jan 04, 2005 11:28 am

Joined: 04 Jan 2005

Posts: 1

Re: How to implement polymorphism using C language

Look at this
http://www.embedded.com/97/fe29712.htm

Asim Shyan Lam <sflam@...> wrote:
Reply embedded...> -----Original Message-----> From: Fernando Arturo Gómez Flores [mailto:fernando.gomez@...]> Sent: Wednesday, December 29, 2004 4:29 PM> To: Programmers-Town@yahoogroups.com> Subject: Re: (PT) How to implement polymorphism using C language> > Ah, I disagree. I think C supports function overload. As an example, take> the fcntl function in Linux API. That C-pure POSIX-standard function, used> for locking files, is declared as follows:How do you "know" they are declared as such?> > #include <unistd.h>> #include <fcntl.h>> int fcntl(int fd, int cmd);> int fcntl(int fd, int cmd, long arg);> int fcntl(int fd, int cmd, struct flock* lock);> > I think that is function overloaded. I`m I missing something?I
think so. How about actually looking how it is defined in the header, orgoogle?http://www.opengroup.org/onlinepubs/009695399/functions/fcntl.htmlHTHShyanTo unsubscribe : programmers-town-unsubscribe@yahoogroups.com

Asim Maqsood Basraa__________________________________________________Do You Yahoo!?Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com

shabble Posted: Tue Jan 04, 2005 3:30 pm

Joined: 29 Dec 2004

Posts: 31

Re: How to implement polymorphism using C language

From: "Fernando Arturo Gómez Flores"
> De: icas.net@...] En nombre de Paul Herring
>> From: "Fernando Arturo Gómez Flores"
>>
[...]
>> >I think that is function overloaded. I`m I missing something?
>>
>> fcntl() is varadic, and it (at runtime) determines what (if
>> any) the third arguement is from the second argument.
>> If that doesn`t appear to make sense, think of printf() and
>> how it might determine the 2nd, 3rd etc. parameters. (And no,
>> there isn`t a definition of printf with every permutation of
>> parameters in stdio.h .)
>>
>
>So, if I understood, are you saying that fcntl is defined something as:
>int fcntl(int fd, int cmd, ...)
>as printf?

Yes. e.g. <http://mkssoftware.com/docs/man3/fcntl.3.asp>

--
PJH

"Consistently separating words by spaces became a general custom about the tenth
century A.D., and lasted until about 1957, when FORTRAN abandoned the practice."
-- Sun FORTRAN Reference Manual

Alderley plc, Arnolds Field Estate, The Downs, Wickwar, Gloucestershire, GL12
8JD, UK
Tel: +44(0)1454 294556 Fax: +44 (0)1454 299272

Website : www.alderley.com Sales : sales@... Service :
service@...

This email and its contents are confidential and are solely for the use of the
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email is strictly prohibited. Should you receive this email in error please
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kith_kahnan Posted: Tue Jan 04, 2005 11:42 pm

Joined: 04 Jan 2005

Posts: 13

Re: How to implement polymorphism using C language

----- Original Message -----
From: "Asim Maqsood Basraa" <basraaji@...>
To: <Programmers-Town@yahoogroups.com>
Sent: Monday, January 03, 2005 9:28 PM
Subject: RE: (PT) How to implement polymorphism using C language

> Look at this
> http://www.embedded.com/97/fe29712.htm
>
> Asim
>

Interesting. Rather interesting. Thanks for the article!

Regards,
Fernando Gomez.

> Shyan Lam <sflam@...> wrote:
> Reply embedded...
>
> > -----Original Message-----
> > From: Fernando Arturo Gómez Flores
[mailto:fernando.gomez@...]
> > Sent: Wednesday, December 29, 2004 4:29 PM
> > To: Programmers-Town@yahoogroups.com
> > Subject: Re: (PT) How to implement polymorphism using C language
> >
> > Ah, I disagree. I think C supports function overload. As an example,
take
> > the fcntl function in Linux API. That C-pure POSIX-standard function,
used
> > for locking files, is declared as follows:
>
> How do you "know" they are declared as such?
>
> >
> > #include <unistd.h>
> > #include <fcntl.h>
> > int fcntl(int fd, int cmd);
> > int fcntl(int fd, int cmd, long arg);
> > int fcntl(int fd, int cmd, struct flock* lock);
> >
> > I think that is function overloaded. I`m I missing something?
>
> I think so. How about actually looking how it is defined in the header,
or
> google?
>
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