iterator_traits

[Lieven]

Is there a way in C++, given an iterator, I can get the container it's
pointing to, in analogy of anIterator::value_type which gives the type of
the elements of the container ?

 

[Rob Williscroft]

Lieven wrote in in
comp.lang.c++:

Is there a way in C++, given an iterator, I can get the container it's
pointing to, in analogy of anIterator::value_type which gives the type of
the elements of the container ?

No, sorry. There simply isn't enough information associated with
an iterator type to work back to the container.

As an example a T * type could be an iterator into an inbuilt array
T array[ 100 ] or a std::vector< T >.

Rob.

 

[Jonathan Turkanis]

Is there a way in C++, given an iterator, I can get the container it's
pointing to, in analogy of anIterator::value_type which gives the type of
the elements of the container ?

You can't even get the type of container its pointing into, unless its one of
the standard inerter iterators.

Jonathan

 

[Siemel Naran]

Lieven wrote in news:[email protected] in

Is there a way in C++, given an iterator, I can get the container it's
pointing to, in analogy of anIterator::value_type which gives the type of
the elements of the container ?

No, sorry. There simply isn't enough information associated with
an iterator type to work back to the container.

As an example a T * type could be an iterator into an inbuilt array
T array[ 100 ] or a std::vector< T >.

As far as standard containers go, it could also be a std::basic_string<int>.