pointer to function

[laenos]

How can access to a variable defined in a function which is part of a derived class from a base class? Is the follow code ok?

CClassBase{
public:
void FunctionBase;
CClassDerived  *m_pVble; // define a pointer to an object of the Derived class
};

CClassDerived{

void FunctionDerived;

};	

void CClassBase::FunctionBase{
nVble=m_pVble->Vble; // pointer to vble of the derived class. is ok?
}


void CClassDerived::FunctionDerived{
Wstring Vble;
Vble = getInfoString();	
}

Thank you in advance

[coder777]

You cannot access a variable defined in a function (from another function). It's a local variable.

A function name must end with (): void FunctionBase();

You can have a pointer to the derived class. But then you need a forward declaration/reference:

https://en.wikipedia.org/wiki/Forward_declaration

CClassBase{
public:
void FunctionBase(); // Note: ()
class CClassDerived  *m_pVble; // Note: class -> forward reference
};

class CClassDerived; // Note: forward declaration
CClassBase{
public:
void FunctionBase(); // Note: ()
CClassDerived  *m_pVble;
};

Line 15: nVble is not defined -> error

[koopey]

@coder777 i think you need to add 'class' keyword before 'CClassBase' though.

class CClassDerived; // Note: forward declaration
class CClassBase{///addition of class here
public:
void FunctionBase(); // Note: ()
CClassDerived  *m_pVble;
};

[coder777]

i think you need to add 'class' keyword before 'CClassBase' though.

Yes

[laenos]

Thanks