Try with 2d vector catch the error

[Milano]

I declare my 2d vector as follows:

std::vector<std::vector<int> > mattrix_

in try-catch block and I receive the error caught from catch(...), I make this question just to confirm if it is of necessity for me to initialize that 2d vector at the same time in the try block...Hopefully I can receive any yes-or-nos or any comments from you...Sorry for such a question since I am really new to this.

Thanks a lot in advance,

Regards,

-Milano

[Assmaster]

Umm.. I don't think I understand what you're asking, but there's nothing wrong with the single line of code you posted. (Except from a missing ';' that is!) And certainly nothing that should end up in an exception being thrown.

Could you please try to ******** what you are asking?

[Axter]

Show us more of your code.

Make sure you do a resize for each iteration.
Example:

         std::vector< std::vector< int > > vec_2dArray(Q_Col);
         for (int i = 0;i < Q_Col;++i) vec_2dArray[i].resize(Q_Row);
         for (int t = 0;t < QtyTestItera;++t)
         for(int i0 = 0;i0 < Q_Col;++i0)
         {
              for(int i1 = 0;i1 < Q_Row;++i1)
              {
                   vec_2dArray[i0][i1] = i0 + i1;
              }
         } 

[Axter]

I recommend using the following class for 2D arrays.

template < class T>
class dynamic_2d_array
{
public:
    dynamic_2d_array(int row, int col):m_row(row),m_col(col), m_data((row!=0&&col!=0)?new T[row*col]:NULL){}
    ~dynamic_2d_array(){if(m_data) delete []m_data;}
    inline T* operator[](int i) {return (m_data + (m_col*i));}
    inline T const*const operator[](int i) const {return (m_data + (m_col*i));}
private:
    const int m_row;
    const int m_col;
    T* m_data; 
}; 

Declare it like this:

dynamic_2d_array<int> My2DArray(33, 44); 

You can then reference it just like a C-Style 2D array
My2DArray[1][22] = 3;

[Milano]

Thanks a lot for your answers

Actually, I'd like to use 2d vector to read the content of my file, but when I declared it as above (Sorry, I made a typo, without , my program couldnot read anything, I initialized it again and it worked fine then, thats why I made that question just for confirmation, thats all...

Thanks again,

-Milano