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下面是实现一个元组的简单思路

代码如下：

#ifndef MY_TUPLE_HPP#define MY_TUPLE_HPPtemplate 
   
    class my_tuple {};template 
    
     class my_tuple
     
      {public:	typedef my_tuple<>  base_type;	typedef my_tuple
      
        this_type;	typedef T           element_type;	my_tuple(const T& t) : element_(t) {}	T& get()	{		return element_;	}private:	T element_;};template 
       
        class my_tuple
        
          : public my_tuple
         
          {public: typedef my_tuple
          
            base_type; typedef my_tuple
           
             this_type; typedef T element_type; my_tuple(const T& t, Args... args) : base_type(args...), element_(t) {} T& get() { return element_; }private: T element_;};template 
            
             struct select {};template 
             
              struct select<0, my_tuple
              
               >{ typedef my_tuple
               
                 this_type; typedef T element_type;};template 
                
                 struct select
                 
                  >{ typedef typename select
                  
                   >::this_type::base_type this_type; typedef typename select
                   
                    >::this_type::base_type::element_type element_type;};template 
                    
                     struct counter {};template <>struct counter<>{ static const size_t count = 0;};template 
                     
                      struct counter
                      
                       { static const size_t count = counter
                       
                        ::count + 1;};template 
                        
                         typename select
                         
                          >::element_type&my_tuple_get(my_tuple
                          
                           & tup){ return (static_cast
                           
                            >::this_type&>(tup)).get();}template 
                            
                             my_tuple
                             
                               make_my_tuple(Args... args){ typedef my_tuple
                              
                                tuple_type; return tuple_type(args...);}template 
                               
                                size_t get_my_tuple_size(my_tuple
                                
                                 & tup){ return counter
                                 
                                  ::count;}#endif
                                 
                                
                               
                              
                             
                            
                           
                          
                         
                        
                       
                      
                     
                    
                   
                  
                 
                
               
              
             
            
           
          
         
        
       
      
     
    
   

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