Re: Generic object with a member whose type is the iterator type of its container
rawhide <mark.rollins@yahoo.com> wrote:
I started working on a custom container class which would hold objects
which have iterators back to the container. I can't figure out how to
write it, not that its even possible. Here is uncompilable code which
illustrates the problem.
template <class T, class I>
class Item
{
T object_;
I iterator_;//this is the iterator back into the Item's container
};
template<class T>
class Container
{
//impossible to compile yet illustrates my conundrum
typedef Item<T, ContainerType::iterator> ItemType;
typedef std::list<ItemType> ContainerType;
ContainerType container_;
};
If possible, how can I get Item to know of its container's iterator
type?
provide nested typedefs to provide nested types of the template
parameters like:
template <class T,class I>
Class Item
{
public:
typedef T object_type;
typedef I iterator_type;
private:
T object__;
I iterator_;
// ...
public:
// ...
// get a copy of iterator_
I get_iterator() const {return iterator_;}
}
template <class Data>
void foo(Data &x)
{
typename Data::iterator_type it = x.get_iterator();
// use it.
if
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