Vector reading data unsuccessfully

**porsche911nfs** · 05-01-2009

If I have this vector in the private portion of my class I have:

Code:

vector <int> numbers;

and I have this in my main() function:

Code:

ifstream in_file;
	in_file.open("numbers.dat");
	
    if (in_file.fail())
	{
       cout << "Failed to open file." << endl;
       exit(1);
    }
    
    while (in_file >> next)
    {  
       numbers.push_back[next];
       next++;
    }
    in_file.close();

and I get an error on the push_back line. The error reads:

expected primary-expression before '.' token

I don't really see anything wrong with this...what can I do to fix it?! Thanks for the help!

**brewbuck** · 05-01-2009

Originally Posted by porsche911nfs

Code:

       numbers.push_back[next];

Those should be parentheses, not square brackets.

**porsche911nfs** · 05-01-2009

that would make sense, haha. Unfortunately, I get the same error message. It has to do something with calling the private vector....

**anon** · 05-01-2009

Only the member functions of the class (and functions/classes declared as friends) are allowed access to private members. It is most probably a mistake on your part to attempt to access the vector elsewhere.

**porsche911nfs** · 05-01-2009

how would i fix this then?

**brewbuck** · 05-01-2009

Originally Posted by porsche911nfs

how would i fix this then?

If users of the class need the ability to insert things into the vector, you need to provide a public method which does that. However, they should not be allowed to insert anything they want "willy-nilly." If that were the case, the vector might as well have been public.

**cpjust** · 05-01-2009

Code:

    while (in_file >> next)
    {  
       numbers.push_back[next];
       next++;
    }

If you have that in your main() function, and numbers is supposed to be a member of some class, then where is the object of the class that contains numbers? You can't just call a member variable from outside of a class...

**Daved** · 05-03-2009

>> next++;

Note that the line above is useless. You are reading into the next variable anyway, so incrementing it does nothing.

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