How to refer to an “owner class” in C++?


How to refer to an “owner class” in C++?



I have code that looks like this:

template<class T> class list { public:     class iterator; };  template<class T> class list::iterator { public:     iterator(); protected:     list* lstptr; };  list<T>::iterator::iterator() {     //??? } 

I want to make the constructor of list::iterator to make iterator::lstptr point to the list it's called from. I.e.:

list xlst; xlst::iterator xitr; //xitr.lstptr = xlst 

How would I do that?

And also, am I referencing my iterator-constructor right, or should I do something like this:

template<class T> class list<T>::iterator { public:     list<T>::iterator(); protected:     list* lstptr; }; 



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1:



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You can pass the list to the constructor of iterator:.
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list xlst; list::iterator xitr(xlst); 
Or, you could make an iterator factory function:.
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list xlst; list::iterator xitr = xlst.create_iter(); 
In the factory function case, the create_iter() function can use this to refer to the enclosing list..
Which classes do I need to nice solve the problem?


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Since you don't need to change (reseat) the pointer and there's no need for the NULL value, I would instead use a reference.

Also you can use an initializer list when assigning the member variable (and have to if you're using a reference)..
template<class T> class list::iterator { public:     iterator( list& parent ) : lstptr( parent ){}  protected:     list& lstptr; }; 
And as mentioned before: use a factory method inside the list class to construct objects of type list::iterator..



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