Private member vector of vector dynamic memory allocation
- by Geoffroy
Hello,
I'm new to C++ (I learned programming with Fortran), and I would like to allocate dynamically the memory for a multidimensional table. This table is a private member variable :
class theclass{
public:
void setdim(void);
private:
std::vector < std::vector <int> > thetable;
}
I would like to set the dimension of thetable with the function setdim().
void theclass::setdim(void){
this->thetable.assign(1000,std::vector <int> (2000));
}
I have no problem compiling this program, but as I execute it, I've got a segmentation fault.
The strange thing for me is that this piece (see under) of code does exactly what I want, except that it doesn't uses the private member variable of my class :
std::vector < std::vector < int > > thetable;
thetable.assign(1000,std::vector <int> (2000));
By the way, I have no trouble if thetable is a 1D vector. In theclass :
std::vector < int > thetable;
and if in setdim :
this->thetable.assign(1000,2);
So my question is : why is there such a difference with "assign" between thetable and this-thetable for a 2D vector? And how should I do to do what I want?
Thank-you for your help,
Best regards,
--
Geoffroy
