Re: [Dev-C++] (code correction) Help with vectors
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Re: [Dev-C++] (code correction) Help with vectors
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From: Michael C U. <mu...@cb...> - 2004-01-08 19:02:20
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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;
> >>>}
> >>>
> >>>--
> >>>
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> >>>
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>
> --
>
> 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!!
>
>
>
>
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> Perforce is the Fast Software Configuration Management System offering
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