Discussion:
STL::Accessing the iterator for a "passed" container type
(too old to reply)
Generic Usenet Account
2007-10-05 22:40:29 UTC
Permalink
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;
}
Markus Schoder
2007-10-05 23:08:00 UTC
Permalink
Post by Generic Usenet Account
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]
Post by Generic Usenet Account
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;
Post by Generic Usenet Account
// ** Compiler error upon uncommenting **
}
--
Markus Schoder
Andre Kostur
2007-10-05 23:09:51 UTC
Permalink
Post by Generic Usenet Account
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)
s***@gmail.com
2007-10-06 11:35:51 UTC
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