Std :: bind no viable conversion

I created a pathfind algorithm where I can set a heuristic. But I am using

function<int (Point2i origin, Point2i destiny)> heuristicFunc;

      

        
        
        
      

    

As my function pointer and I want to initialize it with my default elite.

So:

Pathfind.h

class Pathfind{
    private:
        function<int (Point2i origin, Point2i destiny)> heuristicFunc;
        int hMethod(Point2i origin, Point2i destiny);
    public:
      Pathfind();
}

      

        
        
        
      

    

Pathfind.cpp

Pathfind::Pathfind(){
    //1st try
    this->heuristicFunc=&Pathfind::hMethod;
    //2nd try
    this->heuristicFunc=std::bind(&Pathfind::hMethod, this);
}

      

        
        
        
      

    

But it returns the same error:

/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/C++/v1/functional: 1472:15: Candidate function not viable: unknown conversion from 'int (Core :: Pathfind :: *) (Point2i, Point2i) 'to' const std :: __ 1 :: function, sf :: Point2)> 'for 1st argument

why is it trying to convert from int (Core :: Pathfind :: *)?

Thank.