Thread: sharing a static varable across classes

Hello.

I have simple class called Board.hpp and Board.cpp.

I have also a DNBoard.hpp and DNBoard.cpp. I have a static variable in Board.hpp and I set that variable in Board.cpp. I need a static as the variable should have class scope.

However, when I try and access that variable from DNBoard.cpp I get a negative value and not the value that I set in the Board.cpp.

Board.hpp

Code:

class Board
{
public:
static int bHandle(){return _bHandle;}

private:
static int _bHandle;
};

Board.cpp

Code:

int Board::_bHandle = 0; //initialize

void OpenLibrary()
{
     Board::_bHandle = 101023; //Value I want to set and access in DNBoard.cpp

DNBoard.hpp

Code:

#include "Board.hpp"

class DNBoard : public Board
{
  // some stuff here
};

DNBoard.cpp

Code:

void Service()
{
    int handle = Board::bHandle(); //Give an incorrect value here
}

hello dude...
_bHandle is private...
if you want to access it in its derived class, use protected...

I guess your code like this:

Code:

#include <stdio.h>;

class Board
{
public:
    static int bHandle(){return _bHandle;}
    void OpenLibrary();

protected:
    static int _bHandle;
};

class DNBoard : public Board
{
public:
    void Service();
};


int Board::_bHandle = 0; //initialize

void Board::OpenLibrary()
{
     Board::_bHandle = 101023; //Value I want to set and access in DNBoard.cpp
}

void DNBoard::Service()
{
    int handle = Board::bHandle(); //Give an incorrect value here
    printf("%i", Board::_bHandle);
}

int main()
{
    Board board;
    board.OpenLibrary();

    DNBoard dnboard;
    dnboard.Service();

}

Am I right?