Re: STL: assistance with error - class undefine type

From:

Mark P <usenet@fall2005REMOVE.fastmailCAPS.fm>

Newsgroups:

comp.lang.c++

Date:

Fri, 19 May 2006 18:13:23 GMT

Message-ID:

<7Vnbg.29152$4L1.15863@newssvr11.news.prodigy.com>

Alden Pierre wrote:

Hello,

I'm trying to create my own user define container, but I'm having a
little hard time figuring out why is my class considered undefined by my
compiler. Here is the following code.

It would be a lot more helpful if you showed exactly what the compiler said.

// file pos_neg_array.h

#ifndef FILE_POS_NEG_ARRAY
#define FILE_POS_NEG_ARRAY
#include <iterator>
#include <algorithm>
#include <iostream>

using namespace std;

template< class T, class Allocator = allocator <T> >
class Pos_Neg_Array {
  private:

  T * ptr;
  unsigned zero;
  unsigned pos_extent;
  unsigned neg_extent;
  Allocator a;

  public:

  typedef T valuetype;
  typedef T allocator_type;

Are you sure about this?

  typedef T & reference;
  typedef const T & const_reference;
  typedef int size_type;
  typedef int difference_type;
  typedef T * pointer;
  typedef const T * const_pointer;

  // constructor
  Pos_Neg_Array()

Error, missing semicolon

};
#endif

// implementation file pos_neg_array.cpp

#include "pos_neg_array.h"

template <class T, class Allocator = allocator <T> >
Pos_Neg_Array<T>::Pos_Neg_Array()
{

}

I'm still not clear what your problem is. As a possibly helpful piece
of advice, you will generally need to include the implementation of a
template class in the header file (there are exceptions and
workarounds-- see the FAQ for more).