base class initialization

[the one]

The last class doesn't compile.
Any suggestion ?

I've tried both
CDerivedEx( int x, CString s, int a ) : CDerived( s, a ) : CBase( a )
and
CDerivedEx( int x, CString s, int a ) : CDerived( s, a ) , CBase( a )


Both gets error! ??



class CBase
{
CBase( int a ){;};
CBase( CString s ){;};

~CBase(){;};
};


class CDerived : public CBase
{
CDerived( CString s, int a ) : CBase( s ) {;}; //with string
~CDerived( ){;};
};


class CDerivedEx : public CDerived
{
CDerivedEx( int x, CString s, int a ) : CDerived( s, a ) : CBase( a ){;}; // with int
~CDerivedEx{;};
};

[Codeplug]

You can only initialize your immediate base class.
You have to provide multiple constructors to give "access" to your base class's constructors.
For example:

class CBase
{
public:
    CBase(int a) {}
    CBase(CString s) {}

    ~CBase() {}
};//CBase


class CDerived : public CBase
{
public:
    CDerived(CString s) : CBase(s) {} //with CString
    CDerived(int a) : CBase(a) {} //with int

    ~CDerived() {}
};//CDerived


class CDerivedEx : public CDerived
{
public:
    CDerivedEx(int x, CString s) : CDerived(s) {} // with CString
    CDerivedEx(int x, int a) : CDerived(a) {} // with int

    ~CDerivedEx() {}
};//CDerivedEx

If this doesn't meat your needs, then don't use constructors to construct your object. For example, alot of MFC objects use Create() or some other method to officially "construct" the object into something usable.

gg