dev-cpp-users

[Dev-C++] Help with creating objects dynamically

[Satish M. <sat...@ya...>]

Hello,

   I have the following requirement while creating objects.. I will try to
explain it using a small example..

   Suppose I have a class Student defined and I want to create objects of
type Student inside the main function..

   And say, the actual name with which i want to create the obect is
stored in a character array at run time.. say i have the following
statement
char NAME[]=getName();
and the above function is returning the name "JOHN" at run time.

   Now i want to get the name out of the character array and create the
object using that particular name at run time.. i.e., 
Student JOHN;  

   in a nutshell i want to give the name of the objects to be created at
run time. IS THIS POSSIBLE?? IF SO CAN ANYONE HELP ME WITH THIS??

Thank You in advance.
-Sateesh Medepalli 

__________________________________
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Re: [Dev-C++] Help with creating objects dynamically

[<or...@vp...>]

Satish Medepalli wrote:
>    I have the following requirement while creating objects.. I will try to
> explain it using a small example..
> 
>    Suppose I have a class Student defined and I want to create objects of
> type Student inside the main function..
> 
>    And say, the actual name with which i want to create the obect is
> stored in a character array at run time.. say i have the following
> statement
> char NAME[]=getName();
> and the above function is returning the name "JOHN" at run time.
> 
>    Now i want to get the name out of the character array and create the
> object using that particular name at run time.. i.e., 
> Student JOHN;  
> 
>    in a nutshell i want to give the name of the objects to be created at
> run time. IS THIS POSSIBLE?? IF SO CAN ANYONE HELP ME WITH THIS??

Nope. As far as I know, this is not possible in C++. I know, that Perl 
can do it, but if you EVER programmed in Perl, you know how different it 
is. So I don't think it ca nbe done.

A solution to your problem might be to give a "name" member to your 
class, then at object creation, the constructor takes it as parameter, 
and copies it into the name member.

--
Greetings,
   Balázs

RE: [Dev-C++] Help with creating objects dynamically

[Marc H. <ma...@e-...>]

I can see absolutely no requirement to do this at all. In addition (and =
to
answer the question) I can see absolutely no way of doing it either.
Scripting languages that have some kind of eval statement could do this, =
but
again, I can see no requirement for it (although I have used a similar
mechanism in a JScript ASP project to create objects of a particular =
name,
but never dependant on data within the object itself).=20

Maybe if you enlighten us on why you would want to do this, we could =
help
you find a solution.

__________________________________
Marc Heiligers

=20

-----Original Message-----
From: dev...@li...
[mailto:dev...@li...] On Behalf Of Satish
Medepalli
Sent: 21 July 2003 06:28
To: dev...@li...
Subject: [Dev-C++] Help with creating objects dynamically

Hello,

   I have the following requirement while creating objects.. I will try =
to
explain it using a small example..

   Suppose I have a class Student defined and I want to create objects =
of
type Student inside the main function..

   And say, the actual name with which i want to create the obect is
stored in a character array at run time.. say i have the following
statement
char NAME[]=3DgetName();
and the above function is returning the name "JOHN" at run time.

   Now i want to get the name out of the character array and create the
object using that particular name at run time.. i.e.,=20
Student JOHN; =20

   in a nutshell i want to give the name of the objects to be created at
run time. IS THIS POSSIBLE?? IF SO CAN ANYONE HELP ME WITH THIS??

Thank You in advance.
-Sateesh Medepalli=20

__________________________________
Do you Yahoo!?
SBC Yahoo! DSL - Now only $29.95 per month!
http://sbc.yahoo.com

RE: [Dev-C++] Help with creating objects dynamically

[Satish M. <sat...@ya...>]

Hello Marc,

  Thank you for your reply. There is no real necessity for me to do so.. I
can make it work using a hash table or some kind of a mapping function.. I
just thought that if it was possible in the way I earlier asked, I could
save some execution time as there will not be much need for searching
operation..

  As i got almost every feedback saying that this is not possible, I think
I will stick to a hash table solution.

  Thank you for all your help with this.
-Sateesh Medepalli


--- Marc Heiligers <ma...@e-...> wrote:
> I can see absolutely no requirement to do this at all. In addition (and
> to
> answer the question) I can see absolutely no way of doing it either.
> Scripting languages that have some kind of eval statement could do this,
> but
> again, I can see no requirement for it (although I have used a similar
> mechanism in a JScript ASP project to create objects of a particular
> name,
> but never dependant on data within the object itself). 
> 
> Maybe if you enlighten us on why you would want to do this, we could
> help
> you find a solution.
> 
> __________________________________
> Marc Heiligers
> 
>  
> 
> -----Original Message-----
> From: dev...@li...
> [mailto:dev...@li...] On Behalf Of Satish
> Medepalli
> Sent: 21 July 2003 06:28
> To: dev...@li...
> Subject: [Dev-C++] Help with creating objects dynamically
> 
> Hello,
> 
>    I have the following requirement while creating objects.. I will try
> to
> explain it using a small example..
> 
>    Suppose I have a class Student defined and I want to create objects
> of
> type Student inside the main function..
> 
>    And say, the actual name with which i want to create the obect is
> stored in a character array at run time.. say i have the following
> statement
> char NAME[]=getName();
> and the above function is returning the name "JOHN" at run time.
> 
>    Now i want to get the name out of the character array and create the
> object using that particular name at run time.. i.e., 
> Student JOHN;  
> 
>    in a nutshell i want to give the name of the objects to be created at
> run time. IS THIS POSSIBLE?? IF SO CAN ANYONE HELP ME WITH THIS??
> 
> Thank You in advance.
> -Sateesh Medepalli 
> 
> __________________________________
> Do you Yahoo!?
> SBC Yahoo! DSL - Now only $29.95 per month!
> http://sbc.yahoo.com
> 
> 


__________________________________
Do you Yahoo!?
SBC Yahoo! DSL - Now only $29.95 per month!
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RE: [Dev-C++] Help with creating objects dynamically

[Marc H. <ma...@e-...>]

Hi Sateesh,

I think what you're looking for is the STL std::map which serves as a =
kind
of associative array. There are other guys on this list more educated in =
the
ways of STL than I. I'm sure they will help you out if you have =
problems.=20

__________________________________
Marc Heiligers


-----Original Message-----

Hello Marc,

  Thank you for your reply. There is no real necessity for me to do so.. =
I
can make it work using a hash table or some kind of a mapping function.. =
I
just thought that if it was possible in the way I earlier asked, I could
save some execution time as there will not be much need for searching
operation..

  As i got almost every feedback saying that this is not possible, I =
think I
will stick to a hash table solution.

  Thank you for all your help with this.
-Sateesh Medepalli


--- Marc Heiligers <ma...@e-...> wrote:
> I can see absolutely no requirement to do this at all. In addition=20
> (and to answer the question) I can see absolutely no way of doing it=20
> either. Scripting languages that have some kind of eval statement=20
> could do this, but
> again, I can see no requirement for it (although I have used a similar
> mechanism in a JScript ASP project to create objects of a particular
> name,
> but never dependant on data within the object itself).=20
>=20
> Maybe if you enlighten us on why you would want to do this, we could=20
> help you find a solution.
>=20
> __________________________________
> Marc Heiligers
>=20
> -----Original Message-----
>=20
>    I have the following requirement while creating objects.. I will=20
> try to explain it using a small example..
>=20
>    Suppose I have a class Student defined and I want to create objects =

> of type Student inside the main function..
>=20
>    And say, the actual name with which i want to create the obect is=20
> stored in a character array at run time.. say i have the following=20
> statement char NAME[]=3DgetName();
> and the above function is returning the name "JOHN" at run time.
>=20
>    Now i want to get the name out of the character array and create=20
> the object using that particular name at run time.. i.e., Student=20
> JOHN;
>=20
>    in a nutshell i want to give the name of the objects to be created=20
> at run time. IS THIS POSSIBLE?? IF SO CAN ANYONE HELP ME WITH THIS??
>=20
> Thank You in advance.
> -Sateesh Medepalli

RE: [Dev-C++] Help with creating objects dynamically

[Ioannis V. <iv...@em...>]

> -----Original Message-----
> From: dev...@li...
> [mailto:dev...@li...] On Behalf Of Satish
> Medepalli
> Sent: 21 July 2003 06:28
> To: dev...@li...
> Subject: [Dev-C++] Help with creating objects dynamically
> 
> Hello,
> 
>    I have the following requirement while creating objects.. 
> I will try to
> explain it using a small example..
> 
>    Suppose I have a class Student defined and I want to 
> create objects of
> type Student inside the main function..
> 
>    And say, the actual name with which i want to create the obect is
> stored in a character array at run time.. say i have the following
> statement
> char NAME[]=getName();
> and the above function is returning the name "JOHN" at run time.
> 
>    Now i want to get the name out of the character array and 
> create the
> object using that particular name at run time.. i.e., 
> Student JOHN;  
> 
>    in a nutshell i want to give the name of the objects to be 
> created at
> run time. IS THIS POSSIBLE?? IF SO CAN ANYONE HELP ME WITH THIS??
> 
> Thank You in advance.
> -Sateesh Medepalli 


Strangely enough I did not receive your email and I am answering it through
Marc Heiligers 's email.


After the compilation no object has any name. So you can't define its name
at run time (and even if they had, how would that be useful to you?) .






Ioannis Vranos
 
* Programming pages: http://www.noicys.freeurl.com
* Alternative URL 1: http://run.to/noicys
* Alternative URL 2: http://www.noicys.cjb.net

RE: [Dev-C++] Help with creating objects dynamically

[Abhijit S. <mu...@gm...>]

Hello, Satish.

>    I have the following requirement while creating objects.. I will try to
> explain it using a small example..

Well, for one, you have to get it out of your head that the name of the
object changes its behaviour, or, for that matter, your understanding of the
program.

If what you want is to be able to tell who the student is from the object,
simply add a variable to store the name of your student:

class Student
{
	// foo.

	char *student_name;
};

And create some mutators/accessors/constructors/whatever that work with this
new member.

--
Abhijit Shylanath
Homepage: http://mudeth.tripod.com/

Re: [Dev-C++] Help with creating objects dynamically

[Graham D. <g.d...@nt...>]

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
  <meta http-equiv="Content-Type" content="text/html;charset=ISO-8859-1">
  <title></title>
</head>
<body>
<br>
<br>
Satish Medepalli wrote:<br>
<blockquote type="cite"
 cite="mid...@we...">
  <pre wrap="">Hello,

   I have the following requirement while creating objects.. I will try to
explain it using a small example..

   Suppose I have a class Student defined and I want to create objects of
type Student inside the main function..

   And say, the actual name with which i want to create the obect is
stored in a character array at run time.. say i have the following
statement
char NAME[]=getName();</pre>
</blockquote>
You can't do that, either<br>
<blockquote type="cite"
 cite="mid...@we...">
  <pre wrap="">
and the above function is returning the name "JOHN" at run time.

   Now i want to get the name out of the character array and create the
object using that particular name at run time.. i.e., 
Student JOHN;  

   in a nutshell i want to give the name of the objects to be created at
run time. IS THIS POSSIBLE?? IF SO CAN ANYONE HELP ME WITH THIS??</pre>
</blockquote>
No, it's not and, like others I can't see a need.<br>
<blockquote type="cite"
 cite="mid...@we...">
  <pre wrap="">

Thank You in advance.
-Sateesh Medepalli 

__________________________________
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  </pre>
</blockquote>
</body>
</html>

Re: [Dev-C++] Help with creating objects dynamically

[Per W. <pw...@ia...>]

Hi Graham!

Is there possibly some settings to be made in your mail client, to allow
it to better separate your text from the text you are answering? I see
that you are using a html client while I - as a lot of other users - are
using text clients. As you can see from the attached text, it really is
hard to separate your text from Satish's.

If nothing else is possible, maybe you may write GD: at the start of each
of your lines. I don't want to read the original questions multiple times,
just locate the answers and see if I'm satisfied, or if I maybe have some
more comments on the issue at hand.

/Per W

On Mon, 21 Jul 2003, Graham Douglas wrote:

>
>
> Satish Medepalli wrote:
>
>  Hello,
>
>    I have the following requirement while creating objects.. I will try to
> explain it using a small example..
>
>    Suppose I have a class Student defined and I want to create objects of
> type Student inside the main function..
>
>    And say, the actual name with which i want to create the obect is
> stored in a character array at run time.. say i have the following
> statement
> char NAME[]=getName();
>
> You can't do that, either
>
>  and the above function is returning the name "JOHN" at run time.
>
>    Now i want to get the name out of the character array and create the
> object using that particular name at run time.. i.e.,
> Student JOHN;
>
>    in a nutshell i want to give the name of the objects to be created at
> run time. IS THIS POSSIBLE?? IF SO CAN ANYONE HELP ME WITH THIS??
>
> No, it's not and, like others I can't see a need.
>
>  Thank You in advance.
> -Sateesh Medepalli
>

Re: [Dev-C++] Help with creating objects dynamically

[Graham D. <g.d...@nt...>]

Is this any better? I've tried setting the preferences for this mailing 
list to "plain text" so that it doesn't try to send HTML - let's see if 
it works. I might have to try a couple of times to get the formatting 
right, though.

Sorry for the confusion - I'll get there in the end.

Graham

Per Westermark wrote:

>Hi Graham!
>
>Is there possibly some settings to be made in your mail client, to allow
>it to better separate your text from the text you are answering? I see
>that you are using a html client while I - as a lot of other users - are
>using text clients. As you can see from the attached text, it really is
>hard to separate your text from Satish's.
>
>If nothing else is possible, maybe you may write GD: at the start of each
>of your lines. I don't want to read the original questions multiple times,
>just locate the answers and see if I'm satisfied, or if I maybe have some
>more comments on the issue at hand.
>
>/Per W
>
>On Mon, 21 Jul 2003, Graham Douglas wrote:
>
>  
>
>>Satish Medepalli wrote:
>>
>> Hello,
>>
>>   I have the following requirement while creating objects.. I will try to
>>explain it using a small example..
>>
>>   Suppose I have a class Student defined and I want to create objects of
>>type Student inside the main function..
>>
>>   And say, the actual name with which i want to create the obect is
>>stored in a character array at run time.. say i have the following
>>statement
>>char NAME[]=getName();
>>
>>You can't do that, either
>>
>> and the above function is returning the name "JOHN" at run time.
>>
>>   Now i want to get the name out of the character array and create the
>>object using that particular name at run time.. i.e.,
>>Student JOHN;
>>
>>   in a nutshell i want to give the name of the objects to be created at
>>run time. IS THIS POSSIBLE?? IF SO CAN ANYONE HELP ME WITH THIS??
>>
>>No, it's not and, like others I can't see a need.
>>
>> Thank You in advance.
>>-Sateesh Medepalli
>>
>>    
>>
>
>
>
>
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>With VMware you can run multiple operating systems on a single machine.
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>
>  
>

Re: [Dev-C++] Help with creating objects dynamically

[Per W. <pw...@ia...>]

Seems to work find - nice indentation of my original mail :-)

/Per W

On Mon, 21 Jul 2003, Graham Douglas wrote:

> Is this any better? I've tried setting the preferences for this mailing
> list to "plain text" so that it doesn't try to send HTML - let's see if
> it works. I might have to try a couple of times to get the formatting
> right, though.
>
> Sorry for the confusion - I'll get there in the end.
>
> Graham