my Vector class

[vermarajeev]

I'm unable to use char* or string in Vector class.
I know what the problem is but unable to find a proper answer.

One solution is like I can call explicit intialization for char* or string
and perform operations for only those but unable to get how to do that.

Can someone help please.
I want Vector to work with any datatype.

template<class T>
class Vector
{
    int _size;
    T* data;
    char* charData;
public:
    Vector(int size = 0):_size(size),data(new T[_size])
    {}
    ~Vector()
    {
      delete[] data;
    }    
    friend istream& operator>>(istream& is, Vector<T>& v)
    {
        for(int i=0; i<v._size; ++i)
        {
        is>>v.data[i];
        }
        return is;
    }
    T& operator[](int index); 
    const T& operator[](int index)const;
};
template<class T>
T& Vector<T>::operator[](int index)
{
    return data[index];    
}
 
template<class T>
const T& Vector<T>::operator[](int index)const
{
    return data[index];    
}
 
int main()
{    
    //class Vector works for int, char, double 
    //but fails for string or char*
    Vector<int> v(5);
    cin>>v;
    for(int i=0; i<5; ++i)
        cout<<v[i]<<"\t";
 
    Vector<char* > v(5); //fails for this or string
    cin>>v;
    for(int i=0; i<5; ++i)
        cout<<v[i]<<"\t";
 
    return 0;
}

[Jai Vrat Singh]

It should not fail, You are doing a major mistake.. How can you take a char pointer argument from stdin ????? Do you know address where chars are stored..

here it works
[HTML][jsingh]:/home/jsingh/cpp/templates/test% ./a.out
Enter 5 elements
1 2 3 4 5
1 2 3 4 5
aa bb cc dd eee fff ggg
aa bb cc dd eee a t g e f [jsingh@sgs45a-0145]:/home/jsingh/cpp/templates/test% [/HTML]

Code is same:

   43  int main()
    44  {
    45          //class Vector works for int, char, double 
    46          //but fails for string or char*
    47          Vector<int> v(5);
    48          cout<<" Enter 5 elements \n";
    49          cin>>v;
    50          for(int i=0; i<5; ++i)
    51                  cout<<v[i]<<"\t";
    52  //----SEE this
    53          Vector<std::string > s(5); 
    54          cin>>s;
    55          for(int i=0; i<5; ++i)
    56                  cout<<s[i]<<"\t";
    57         
    58          char * c_ptr = new char[8];
    59          c_ptr[0] = 'a'; 
    60          c_ptr[1] = 't'; 
    61          c_ptr[2] = 'g'; 
    62          c_ptr[3] = 'e'; 
    63          c_ptr[4] = 'f'; 
    64          c_ptr[5] = 'k'; 
    65          c_ptr[6] = 'j'; 
    66          c_ptr[7] = 'z'; 
    67
    68          Vector<char *> c(5); 
    69          for(int i=0; i<5; ++i)
    70                  c[i]=c_ptr+i;
    71          for(int i=0; i<5; ++i)
    72                  cout<<*c[i]<<"\t";
    73         
    74          return 0;
    75  } 
    76
    77

[vermarajeev]

Hi sorry,
I was a fool not to see that.

Thankx