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STL::Accessing the iterator for a "passed" container type

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Hi,

I am passing a container type (e.g. list<int>) to a function template
but I am getting a compiler error when I try to declare an iterator
for that type in the function.  However, I am able to invoke begin()
and end() without any problem.  Is there a way to declare an iterator
for the container type?  Sample code follows.

Thanks,
Ramesh


//////////////////////////////////////////////////////
//
///////////////////////////////////////////////////////
#include <iostream>
#include <list>

using namespace std;

//////////////////////////////////////////////////////
//
///////////////////////////////////////////////////////
template<typename T>
void
access_the_iterator(T& collection)
{
  while(collection.begin() != collection.end())
  {
    cout << "In the loop\n";
  }

  //T::iterator iter;
       // ** Compiler error upon uncommenting **
}


//////////////////////////////////////////////////////
//
///////////////////////////////////////////////////////
main()
{
  list<int> coll;
  access_the_iterator(coll);
  return 0;
}
0
Reply usenet23 (151) 10/5/2007 10:40:29 PM 

On Fri, 05 Oct 2007 15:40:29 -0700, Generic Usenet Account wrote:
> Hi,
> 
> I am passing a container type (e.g. list<int>) to a function template
> but I am getting a compiler error when I try to declare an iterator for
> that type in the function.  However, I am able to invoke begin() and
> end() without any problem.  Is there a way to declare an iterator for
> the container type?  Sample code follows.

[snip]

> template<typename T>
> void
> access_the_iterator(T& collection)
> {
>   while(collection.begin() != collection.end()) {
>     cout << "In the loop\n";
>   }
> 
>   //T::iterator iter;

Try

    typename T::iterator iter;

>        // ** Compiler error upon uncommenting **
> }

-- 
Markus Schoder
0
Reply a3vr6dsg-usenet (252) 10/5/2007 11:08:00 PM 


Generic Usenet Account <usenet@sta.samsung.com> wrote in 
news:1191624029.029922.93220@57g2000hsv.googlegroups.com:

> Hi,
> 
> I am passing a container type (e.g. list<int>) to a function template
> but I am getting a compiler error when I try to declare an iterator
> for that type in the function.  However, I am able to invoke begin()
> and end() without any problem.  Is there a way to declare an iterator
> for the container type?  Sample code follows.

That's what is referred to as a dependant type name.  You need the 
"typename" keyword:

    	typename T::iterator iter;


C++ needs the hint that T::iterator is a type and not a function or 
variable name.  (Remember, it doesn't know what T is when it parses that 
line)
0
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Reply sara.girl55 (29) 10/6/2007 11:35:51 AM
comp.lang.c++ 49418 articles. 22 followers.

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