FP.h

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#ifndef FP_H
#define FP_H
 
template<class retT, class argT>
class FP
{
public:
    FP();
 
    template<class T>
    void attach(T *item, retT (T::*method)(argT))
    {
        obj_callback = (FPtrDummy *)(item);
        method_callback = (retT (FPtrDummy::*)(argT))(method);
        return;
    }
 
    void attach(retT (*function)(argT));
    
    retT operator()(argT arg) const;
    
    bool attached();
    
    void detach();
 
private:
    
    // empty type used for casting
    class FPtrDummy;
    
    FPtrDummy *obj_callback;
    
    union
    {
        retT (*c_callback)(argT);                   
        retT (FPtrDummy::*method_callback)(argT);   
    };
};
 
#endif