Mark P wrote:
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).
I apologize for not including the error.
// error report
pos_neg_array.cpp:4: error: invalid use of undefined type `class
Pos_Neg_Array<T, std::allocator<_CharT> >'
pos_neg_array.h:10: error: declaration of `class Pos_Neg_Array<T,
std::allocator<_CharT> >'
pos_neg_array.cpp:4: error: default template arguments may not be used
in function templates
pos_neg_array.cpp:4: error: template definition of non-template
`Pos_Neg_Array<T, std::allocator<_CharT> >::Pos_Neg_Array()'
*** Error code 1
// --------------------------------------------------------