Re: about static member

"Tony Johansson" <t.johansson@logica.com> ha scritto nel messaggio
news:%23hg7roSVJHA.4888@TK2MSFTNGP02.phx.gbl...


Probably CSession is not designed to be defined as 'static' data member?

However, did you try using the classic Singleton pattern?

It builds fine for me on VS2008 (you can just use
CSingleton::GetInstance()->GetSession() to access the CSession "static"
object):

<code>

#include <atlbase.h> // ATL base header
#include <atldbcli.h> // CSession and CDataSource

//
// Use a singleton pattern to get "static" access to CSession and
CDatasource
//
class CSingleton
{
public:

    // Access the only one singleton instance
    static CSingleton* GetInstance();

    ~CSingleton()
    {
        m_isCreated = false;
    }

    CSession * GetSession()
    {
        return &m_session;
    }

    CDataSource * GetDatasource()
    {
        return &m_datasource;
    }

private:
    CSession m_session;
    CDataSource m_datasource;

    //
    // Singleton Mechanics
    //
private:

    // Is the singleton class instance created?
    static bool m_isCreated;

    // Pointer to one and only one singleton instance
    static CSingleton * m_pSingleton;

    // Private constructor, so this class can't be explicitly instantiated
    CSingleton()
    {
    }
};

// Static members initialization
bool CSingleton::m_isCreated = false;
CSingleton * CSingleton::m_pSingleton = NULL;

// Singleton unique accessor
CSingleton* CSingleton::GetInstance()
{
    // Create the singleton if it was not created yet
    if ( ! m_isCreated )
    {
        m_pSingleton = new CSingleton();
        m_isCreated = true;
    }

    // Return the one and only one instance
    return m_pSingleton;
}

int main()
{
    CSession * pSession = CSingleton::GetInstance()->GetSession();
    CDataSource * pDS = CSingleton::GetInstance()->GetDatasource();

    return 0;
}

</code>

HTH,
Giovanni