callback_cpp11.h

#pragma once
#ifndef _OBJC_CALLBACK_H_
#define _OBJC_CALLBACK_H_

template<typename Signature> class objc_callback;

template<typename R, typename... Ts>
class objc_callback<R(Ts...)>                                                              
{                              
public:                                                    
    typedef R (*func)(id, SEL, Ts...);                                              
    
    objc_callback(SEL sel, id obj)                  
    : sel_(sel)                                     
    , obj_(obj)                                     
    , fun_((func)[obj methodForSelector:sel])       
    {
    }     
    
    inline R operator ()(Ts... vs)
    {                                                   
        return fun_(obj_, sel_, vs...);      
    }                                                   
private:                                                
    SEL sel_;                                           
    id obj_;                                            
    func fun_;                                          
};      

#endif // _OBJC_CALLBACK_H_