dev-cpp-users

[Dev-C++] Help with vectors

[Maya <Esc...@ne...>]

Ok I have managed to store data in a std::vector<...> object, but how 
can I get the data from it?

Thanks folks!!


jme::error_t jme::Index::bagIt(){
   // temporary stream
   jme::gnu_io tmp_stream;

   // temporary account object
   jme::Account tmp_acc;

   // set file name
   tmp_stream.setFileName(fname);

   // if the file stream does not exist return return error value
   if(tmp_stream.notExist()){ return jme::fe_no_not_exist;   }

   //set file mode
   tmp_stream.setMode(tmp_stream.read_bin);

   // open file for reading
   tmp_stream.Read();

   // if the file is empty let the class know and return error value
   if(tmp_stream.is_empty()){
      bag_empty = false;
      return jme::fe_empty;
   }

   // get the stream size
   std::streampos fsz = tmp_stream.getFileSize();
   do{
      // Read a record into the jme::Account object
      tmp_stream >> tmp_acc;
      // add record to the container
      bag.push_back(tmp_acc);
    // do this while the maximum number of bits in the file are not
    // reached
   }while(fsz != tmp_stream.getNextRead());

  // sort the container  
   std::make_heap(bag.begin(), bag.end());
   std::sort_heap(bag.begin(), bag.end());
  
   // Return jme::error_t::good
   return jme::good;
}

-- 

FYI
http://www.astro.umd.edu/~marshall/abbrev.html

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* You cannot exercise your power to a point of humiliation.
                               - Jean Chretien

* The media's the most powerful entity on earth. They have the 
  power to make the innocent guilty and to make the guilty 
  innocent, and that's power. 
                                - Malcom X
* "Innocent until proven guilty", no... not in Canada!!

Re: [Dev-C++] Help with vectors

[Michael C U. <mu...@cb...>]

You get the data from a vector the same way you get the data from an
array. So you can either use the subscript operator:

myvec[0] // 1st vector element
myvec[1] // 2nd vector element, etc.

Or you can use pointer arithmetic to iterate through the elements:

for (it = myvec.begin(); it != myvec.end(); ++it)
{
    cout << *it << endl;
}

Does that answer your question?

Mike

On Wed, 7 Jan 2004, Maya wrote:

> Ok I have managed to store data in a std::vector<...> object, but how
> can I get the data from it?
>
> Thanks folks!!
>
>
> jme::error_t jme::Index::bagIt(){
>    // temporary stream
>    jme::gnu_io tmp_stream;
>
>    // temporary account object
>    jme::Account tmp_acc;
>
>    // set file name
>    tmp_stream.setFileName(fname);
>
>    // if the file stream does not exist return return error value
>    if(tmp_stream.notExist()){ return jme::fe_no_not_exist;   }
>
>    //set file mode
>    tmp_stream.setMode(tmp_stream.read_bin);
>
>    // open file for reading
>    tmp_stream.Read();
>
>    // if the file is empty let the class know and return error value
>    if(tmp_stream.is_empty()){
>       bag_empty = false;
>       return jme::fe_empty;
>    }
>
>    // get the stream size
>    std::streampos fsz = tmp_stream.getFileSize();
>    do{
>       // Read a record into the jme::Account object
>       tmp_stream >> tmp_acc;
>       // add record to the container
>       bag.push_back(tmp_acc);
>     // do this while the maximum number of bits in the file are not
>     // reached
>    }while(fsz != tmp_stream.getNextRead());
>
>   // sort the container
>    std::make_heap(bag.begin(), bag.end());
>    std::sort_heap(bag.begin(), bag.end());
>
>    // Return jme::error_t::good
>    return jme::good;
> }
>
> --
>
> FYI
> http://www.astro.umd.edu/~marshall/abbrev.html
>
> E-Mail Policy
> http://www.vif.com/users/escalante/Email_Policy.html
>
> * You cannot exercise your power to a point of humiliation.
>                                - Jean Chretien
>
> * The media's the most powerful entity on earth. They have the
>   power to make the innocent guilty and to make the guilty
>   innocent, and that's power.
>                                 - Malcom X
> * "Innocent until proven guilty", no... not in Canada!!
>
>
>
>
> -------------------------------------------------------
> This SF.net email is sponsored by: Perforce Software.
> Perforce is the Fast Software Configuration Management System offering
> advanced branching capabilities and atomic changes on 50+ platforms.
> Free Eval! http://www.perforce.com/perforce/loadprog.html
> _______________________________________________
> Dev-cpp-users mailing list
> Dev...@li...
> TO UNSUBSCRIBE: http://www23.brinkster.com/noicys/devcpp/ub.htm
> https://lists.sourceforge.net/lists/listinfo/dev-cpp-users
>

[Dev-C++] (code correction) Help with vectors

[Michael C U. <mu...@cb...>]

Oops.

You need to declare "it" as being of type iterator. So in the for
definition, you want:

for (iterator it = myvec.begin(); it != myvec.end(); ++it)

The iterator as assigned above is a pointer to the first element of the
vector.

Mike

On Wed, 7 Jan 2004, Michael C Urban wrote:

> You get the data from a vector the same way you get the data from an
> array. So you can either use the subscript operator:
>
> myvec[0] // 1st vector element
> myvec[1] // 2nd vector element, etc.
>
> Or you can use pointer arithmetic to iterate through the elements:
>
> for (it = myvec.begin(); it != myvec.end(); ++it)
> {
>     cout << *it << endl;
> }
>
> Does that answer your question?
>
> Mike
>
> On Wed, 7 Jan 2004, Maya wrote:
>
> > Ok I have managed to store data in a std::vector<...> object, but how
> > can I get the data from it?
> >
> > Thanks folks!!
> >
> >
> > jme::error_t jme::Index::bagIt(){
> >    // temporary stream
> >    jme::gnu_io tmp_stream;
> >
> >    // temporary account object
> >    jme::Account tmp_acc;
> >
> >    // set file name
> >    tmp_stream.setFileName(fname);
> >
> >    // if the file stream does not exist return return error value
> >    if(tmp_stream.notExist()){ return jme::fe_no_not_exist;   }
> >
> >    //set file mode
> >    tmp_stream.setMode(tmp_stream.read_bin);
> >
> >    // open file for reading
> >    tmp_stream.Read();
> >
> >    // if the file is empty let the class know and return error value
> >    if(tmp_stream.is_empty()){
> >       bag_empty = false;
> >       return jme::fe_empty;
> >    }
> >
> >    // get the stream size
> >    std::streampos fsz = tmp_stream.getFileSize();
> >    do{
> >       // Read a record into the jme::Account object
> >       tmp_stream >> tmp_acc;
> >       // add record to the container
> >       bag.push_back(tmp_acc);
> >     // do this while the maximum number of bits in the file are not
> >     // reached
> >    }while(fsz != tmp_stream.getNextRead());
> >
> >   // sort the container
> >    std::make_heap(bag.begin(), bag.end());
> >    std::sort_heap(bag.begin(), bag.end());
> >
> >    // Return jme::error_t::good
> >    return jme::good;
> > }
> >
> > --
> >
> > FYI
> > http://www.astro.umd.edu/~marshall/abbrev.html
> >
> > E-Mail Policy
> > http://www.vif.com/users/escalante/Email_Policy.html
> >
> > * You cannot exercise your power to a point of humiliation.
> >                                - Jean Chretien
> >
> > * The media's the most powerful entity on earth. They have the
> >   power to make the innocent guilty and to make the guilty
> >   innocent, and that's power.
> >                                 - Malcom X
> > * "Innocent until proven guilty", no... not in Canada!!
> >
> >
> >
> >
> > -------------------------------------------------------
> > This SF.net email is sponsored by: Perforce Software.
> > Perforce is the Fast Software Configuration Management System offering
> > advanced branching capabilities and atomic changes on 50+ platforms.
> > Free Eval! http://www.perforce.com/perforce/loadprog.html
> > _______________________________________________
> > Dev-cpp-users mailing list
> > Dev...@li...
> > TO UNSUBSCRIBE: http://www23.brinkster.com/noicys/devcpp/ub.htm
> > https://lists.sourceforge.net/lists/listinfo/dev-cpp-users
> >
>
>
> -------------------------------------------------------
> This SF.net email is sponsored by: Perforce Software.
> Perforce is the Fast Software Configuration Management System offering
> advanced branching capabilities and atomic changes on 50+ platforms.
> Free Eval! http://www.perforce.com/perforce/loadprog.html
> _______________________________________________
> Dev-cpp-users mailing list
> Dev...@li...
> TO UNSUBSCRIBE: http://www23.brinkster.com/noicys/devcpp/ub.htm
> https://lists.sourceforge.net/lists/listinfo/dev-cpp-users
>

Re: [Dev-C++] (code correction) Help with vectors

[Maya <Esc...@ne...>]

Yes, that was my solution too, but now I a faced with another problem. 
When calling the function member
'const jme::Account& jme::Index::getData()  const; ' I don't have the 
means of knowing the number of elements in the vector, but I am sure 
that HP must have anticipated this problem and add a method that will 
return the number of elements in the array.

Mike, thank you so very much for your help!!

mu...@cb... wrote:

>Oops.
>
>You need to declare "it" as being of type iterator. So in the for
>definition, you want:
>
>for (iterator it = myvec.begin(); it != myvec.end(); ++it)
>
>The iterator as assigned above is a pointer to the first element of the
>vector.
>
>Mike
>
>On Wed, 7 Jan 2004, Michael C Urban wrote:
>
>  
>
>>You get the data from a vector the same way you get the data from an
>>array. So you can either use the subscript operator:
>>
>>myvec[0] // 1st vector element
>>myvec[1] // 2nd vector element, etc.
>>
>>Or you can use pointer arithmetic to iterate through the elements:
>>
>>for (it = myvec.begin(); it != myvec.end(); ++it)
>>{
>>    cout << *it << endl;
>>}
>>
>>Does that answer your question?
>>
>>Mike
>>
>>On Wed, 7 Jan 2004, Maya wrote:
>>
>>    
>>
>>>Ok I have managed to store data in a std::vector<...> object, but how
>>>can I get the data from it?
>>>
>>>Thanks folks!!
>>>
>>>
>>>jme::error_t jme::Index::bagIt(){
>>>   // temporary stream
>>>   jme::gnu_io tmp_stream;
>>>
>>>   // temporary account object
>>>   jme::Account tmp_acc;
>>>
>>>   // set file name
>>>   tmp_stream.setFileName(fname);
>>>
>>>   // if the file stream does not exist return return error value
>>>   if(tmp_stream.notExist()){ return jme::fe_no_not_exist;   }
>>>
>>>   //set file mode
>>>   tmp_stream.setMode(tmp_stream.read_bin);
>>>
>>>   // open file for reading
>>>   tmp_stream.Read();
>>>
>>>   // if the file is empty let the class know and return error value
>>>   if(tmp_stream.is_empty()){
>>>      bag_empty = false;
>>>      return jme::fe_empty;
>>>   }
>>>
>>>   // get the stream size
>>>   std::streampos fsz = tmp_stream.getFileSize();
>>>   do{
>>>      // Read a record into the jme::Account object
>>>      tmp_stream >> tmp_acc;
>>>      // add record to the container
>>>      bag.push_back(tmp_acc);
>>>    // do this while the maximum number of bits in the file are not
>>>    // reached
>>>   }while(fsz != tmp_stream.getNextRead());
>>>
>>>  // sort the container
>>>   std::make_heap(bag.begin(), bag.end());
>>>   std::sort_heap(bag.begin(), bag.end());
>>>
>>>   // Return jme::error_t::good
>>>   return jme::good;
>>>}
>>>
>>>--
>>>
>>>FYI
>>>http://www.astro.umd.edu/~marshall/abbrev.html
>>>
>>>E-Mail Policy
>>>http://www.vif.com/users/escalante/Email_Policy.html
>>>
>>>* You cannot exercise your power to a point of humiliation.
>>>                               - Jean Chretien
>>>
>>>* The media's the most powerful entity on earth. They have the
>>>  power to make the innocent guilty and to make the guilty
>>>  innocent, and that's power.
>>>                                - Malcom X
>>>* "Innocent until proven guilty", no... not in Canada!!
>>>
>>>
>>>
>>>
>>>-------------------------------------------------------
>>>This SF.net email is sponsored by: Perforce Software.
>>>Perforce is the Fast Software Configuration Management System offering
>>>advanced branching capabilities and atomic changes on 50+ platforms.
>>>Free Eval! http://www.perforce.com/perforce/loadprog.html
>>>_______________________________________________
>>>Dev-cpp-users mailing list
>>>Dev...@li...
>>>TO UNSUBSCRIBE: http://www23.brinkster.com/noicys/devcpp/ub.htm
>>>https://lists.sourceforge.net/lists/listinfo/dev-cpp-users
>>>
>>>      
>>>
>>-------------------------------------------------------
>>This SF.net email is sponsored by: Perforce Software.
>>Perforce is the Fast Software Configuration Management System offering
>>advanced branching capabilities and atomic changes on 50+ platforms.
>>Free Eval! http://www.perforce.com/perforce/loadprog.html
>>_______________________________________________
>>Dev-cpp-users mailing list
>>Dev...@li...
>>TO UNSUBSCRIBE: http://www23.brinkster.com/noicys/devcpp/ub.htm
>>https://lists.sourceforge.net/lists/listinfo/dev-cpp-users
>>
>>    
>>
>
>
>-------------------------------------------------------
>This SF.net email is sponsored by: Perforce Software.
>Perforce is the Fast Software Configuration Management System offering
>advanced branching capabilities and atomic changes on 50+ platforms.
>Free Eval! http://www.perforce.com/perforce/loadprog.html
>_______________________________________________
>Dev-cpp-users mailing list
>Dev...@li...
>TO UNSUBSCRIBE: http://www23.brinkster.com/noicys/devcpp/ub.htm
>https://lists.sourceforge.net/lists/listinfo/dev-cpp-users
>  
>

-- 

FYI
http://www.astro.umd.edu/~marshall/abbrev.html

E-Mail Policy
http://www.vif.com/users/escalante/Email_Policy.html

* You cannot exercise your power to a point of humiliation.
                               - Jean Chretien

* The media's the most powerful entity on earth. They have the 
  power to make the innocent guilty and to make the guilty 
  innocent, and that's power. 
                                - Malcom X
* "Innocent until proven guilty", no... not in Canada!!

Re: [Dev-C++] (code correction) Help with vectors

[Michael C U. <mu...@cb...>]

Maya,

If if you are using the standard C++ vector class, then you should be able
to obtain its size by calling its size() method. So for example:

int vec_size = myVec.size();

But I might be missing what exactly your problem is. Are you trying to
access a private vector through a public interface method?

Mike



On Thu, 8 Jan 2004, Maya wrote:

> Yes, that was my solution too, but now I a faced with another problem.
> When calling the function member
> 'const jme::Account& jme::Index::getData()  const; ' I don't have the
> means of knowing the number of elements in the vector, but I am sure
> that HP must have anticipated this problem and add a method that will
> return the number of elements in the array.
>
> Mike, thank you so very much for your help!!
>
> mu...@cb... wrote:
>
> >Oops.
> >
> >You need to declare "it" as being of type iterator. So in the for
> >definition, you want:
> >
> >for (iterator it = myvec.begin(); it != myvec.end(); ++it)
> >
> >The iterator as assigned above is a pointer to the first element of the
> >vector.
> >
> >Mike
> >
> >On Wed, 7 Jan 2004, Michael C Urban wrote:
> >
> >
> >
> >>You get the data from a vector the same way you get the data from an
> >>array. So you can either use the subscript operator:
> >>
> >>myvec[0] // 1st vector element
> >>myvec[1] // 2nd vector element, etc.
> >>
> >>Or you can use pointer arithmetic to iterate through the elements:
> >>
> >>for (it = myvec.begin(); it != myvec.end(); ++it)
> >>{
> >>    cout << *it << endl;
> >>}
> >>
> >>Does that answer your question?
> >>
> >>Mike
> >>
> >>On Wed, 7 Jan 2004, Maya wrote:
> >>
> >>
> >>
> >>>Ok I have managed to store data in a std::vector<...> object, but how
> >>>can I get the data from it?
> >>>
> >>>Thanks folks!!
> >>>
> >>>
> >>>jme::error_t jme::Index::bagIt(){
> >>>   // temporary stream
> >>>   jme::gnu_io tmp_stream;
> >>>
> >>>   // temporary account object
> >>>   jme::Account tmp_acc;
> >>>
> >>>   // set file name
> >>>   tmp_stream.setFileName(fname);
> >>>
> >>>   // if the file stream does not exist return return error value
> >>>   if(tmp_stream.notExist()){ return jme::fe_no_not_exist;   }
> >>>
> >>>   //set file mode
> >>>   tmp_stream.setMode(tmp_stream.read_bin);
> >>>
> >>>   // open file for reading
> >>>   tmp_stream.Read();
> >>>
> >>>   // if the file is empty let the class know and return error value
> >>>   if(tmp_stream.is_empty()){
> >>>      bag_empty = false;
> >>>      return jme::fe_empty;
> >>>   }
> >>>
> >>>   // get the stream size
> >>>   std::streampos fsz = tmp_stream.getFileSize();
> >>>   do{
> >>>      // Read a record into the jme::Account object
> >>>      tmp_stream >> tmp_acc;
> >>>      // add record to the container
> >>>      bag.push_back(tmp_acc);
> >>>    // do this while the maximum number of bits in the file are not
> >>>    // reached
> >>>   }while(fsz != tmp_stream.getNextRead());
> >>>
> >>>  // sort the container
> >>>   std::make_heap(bag.begin(), bag.end());
> >>>   std::sort_heap(bag.begin(), bag.end());
> >>>
> >>>   // Return jme::error_t::good
> >>>   return jme::good;
> >>>}
> >>>
> >>>--
> >>>
> >>>FYI
> >>>http://www.astro.umd.edu/~marshall/abbrev.html
> >>>
> >>>E-Mail Policy
> >>>http://www.vif.com/users/escalante/Email_Policy.html
> >>>
> >>>* You cannot exercise your power to a point of humiliation.
> >>>                               - Jean Chretien
> >>>
> >>>* The media's the most powerful entity on earth. They have the
> >>>  power to make the innocent guilty and to make the guilty
> >>>  innocent, and that's power.
> >>>                                - Malcom X
> >>>* "Innocent until proven guilty", no... not in Canada!!
> >>>
> >>>
> >>>
> >>>
> >>>-------------------------------------------------------
> >>>This SF.net email is sponsored by: Perforce Software.
> >>>Perforce is the Fast Software Configuration Management System offering
> >>>advanced branching capabilities and atomic changes on 50+ platforms.
> >>>Free Eval! http://www.perforce.com/perforce/loadprog.html
> >>>_______________________________________________
> >>>Dev-cpp-users mailing list
> >>>Dev...@li...
> >>>TO UNSUBSCRIBE: http://www23.brinkster.com/noicys/devcpp/ub.htm
> >>>https://lists.sourceforge.net/lists/listinfo/dev-cpp-users
> >>>
> >>>
> >>>
> >>-------------------------------------------------------
> >>This SF.net email is sponsored by: Perforce Software.
> >>Perforce is the Fast Software Configuration Management System offering
> >>advanced branching capabilities and atomic changes on 50+ platforms.
> >>Free Eval! http://www.perforce.com/perforce/loadprog.html
> >>_______________________________________________
> >>Dev-cpp-users mailing list
> >>Dev...@li...
> >>TO UNSUBSCRIBE: http://www23.brinkster.com/noicys/devcpp/ub.htm
> >>https://lists.sourceforge.net/lists/listinfo/dev-cpp-users
> >>
> >>
> >>
> >
> >
> >-------------------------------------------------------
> >This SF.net email is sponsored by: Perforce Software.
> >Perforce is the Fast Software Configuration Management System offering
> >advanced branching capabilities and atomic changes on 50+ platforms.
> >Free Eval! http://www.perforce.com/perforce/loadprog.html
> >_______________________________________________
> >Dev-cpp-users mailing list
> >Dev...@li...
> >TO UNSUBSCRIBE: http://www23.brinkster.com/noicys/devcpp/ub.htm
> >https://lists.sourceforge.net/lists/listinfo/dev-cpp-users
> >
> >
>
> --
>
> FYI
> http://www.astro.umd.edu/~marshall/abbrev.html
>
> E-Mail Policy
> http://www.vif.com/users/escalante/Email_Policy.html
>
> * You cannot exercise your power to a point of humiliation.
>                                - Jean Chretien
>
> * The media's the most powerful entity on earth. They have the
>   power to make the innocent guilty and to make the guilty
>   innocent, and that's power.
>                                 - Malcom X
> * "Innocent until proven guilty", no... not in Canada!!
>
>
>
>
> -------------------------------------------------------
> This SF.net email is sponsored by: Perforce Software.
> Perforce is the Fast Software Configuration Management System offering
> advanced branching capabilities and atomic changes on 50+ platforms.
> Free Eval! http://www.perforce.com/perforce/loadprog.html
> _______________________________________________
> Dev-cpp-users mailing list
> Dev...@li...
> TO UNSUBSCRIBE: http://www23.brinkster.com/noicys/devcpp/ub.htm
> https://lists.sourceforge.net/lists/listinfo/dev-cpp-users
>