没有匹配的函数可调用未解析的重载函数类型

Question

I am getting an error which I don't understand. I'm sure it is quite simple.. but I am still learning C++. I'm not sure if it is related to my parameters being exactly the same for the pure virtual function declaration or if it is something else.

Here is my simplified code:

in header_A.h

class HandlerType
{
public:
   virtual void Rxmsg(same parameters) = 0; //pure virtual
};

--------------------------------------------------
in header_B.h

class mine : public HandlerType
{
public:
   virtual void myinit();
   void Rxmsg(same parameters); // here I have the same parameter list 
//except I have to fully qualify the types since I'm not in the same namespace
};

--------------------------------------------------
in header_C.h

class localnode
{
public:
virtual bool RegisterHandler(int n, HandlerType & handler);
};
--------------------------------------------------

in B.cpp

using mine;

void mine::myinit()
{
   RegisterHandler(123, Rxmsg); //this is where I am getting the error
}

void Rxmsg(same parameters)
{
   do something;
}

Answer 1

It seems to me, that bool RegisterHandler(int n, HandlerType & handler) takes a reference to an object of the class HandlerType and you're trying to pass a function. Obviously that doesn't work.

So I think what you wanna do is passing *this instead of Rxmsg . This will supply RegisterHandler with an instance of the class mine , on which the overridden function Rxmsg can now be invoked.

Notice that the Function Rxmsg will, if done that way, be called on the exact same Object that the variable *this had, at the moment you supplied it to RegisterHandler .

I hope this is what you intended to do and I hope I could help you.

Answer 2

Changing RegisterHandler(123, Rxmsg); to RegisterHandler(123, *this); Solved the problem. Thanks!