Is iterator definition with template not a type in ISO C++?

[Xin Wang]

Hi,

I tried to declare an iterator inside a template class, but the compiler
regards list<State>::iterator as an expression, instead of an iterator.

#include <list>

template <class State>
class Problem
{
..
..
..
list<State>::iterator itr;
..
..
..
}

What's wrong here, what should I do to fix this problem?

Thanks a lot!


Xin Wang

 

[Sumit Rajan]

Hi,

I tried to declare an iterator inside a template class, but the compiler
regards list<State>::iterator as an expression, instead of an iterator.

#include <list>

template <class State>
class Problem
{
.
.
.
list<State>::iterator itr;

This changes to:
typename std::list<State>::iterator itr;


Regards,
Sumit.

 

[Sumit Rajan]

This changes to:
typename std::list<State>::iterator itr;

I should have explained why the word "typename" comes into the picture. It
is used to clarify that "iterator" is a type (and not a static member of
list).

Regards,
Sumit.