[prog] C++ Inheritance

[Sue Stones]

  Would someone mind giving me some pointers on the following error message.
 I just cant see what is going wrong.

I have 3 files, each befining with  a comment block, included below

The output when I attemp to compile the program is below.

 make
g++ -o ftest fstest.C
/tmp/cclfc7rJ.o: In function `main':
/tmp/cclfc7rJ.o(.text+0x1a): undefined reference to 
`fstream_ext::fstream_ext(int, char const *, int)'
collect2: ld returned 1 exit status
make: *** [fstest] Error 1




A part form anything else it is putting in an extra argument "int" in the 
call to the fstream_ext construcotor.  Any ideas what is going on here?





/***************************************************
 *
 *      fstream_ext.h the header file for
 *      fstream_ext which adds fuctionality to the
 *      standard library class fstream
 *
 ***************************************************/
#include <fstream>
#include <iostream>

 class fstream_ext : public fstream {
 public:
        fstream_ext(){} // default constructor
        explicit fstream_ext(const char *filename, openmode mode=in|out);
                        // constructor
        void  reset(void); // resets the read pointer to the
                           // start of the file
        void  skip(int number); // skips over a number of characters
        void  position(char *str); // positions the read pointer after a
                          // given string of characters in the file
 private:
        const char *_fname;
 };


/***************************************************
 *
 *      fstream_ext.C an exention for
 *      fstream which adds fuctionality to the
 *      standard library class fstream
 *
 ***************************************************/
#include "fstream_ext.h"

 fstream_ext::fstream_ext(const char *filename, openmode mode)
        :fstream(filename, mode)
 {
        strcpy(filename, _fname);
 }//constructor

 void  fstream_ext::reset(void)
 {
        fstream::close();
        fstream::open(_fname);
 }//reset

 void  fstream_ext::skip(int number)
 {
 }//number

 void  fstream_ext::position(char *str)
 {
 }//position


/***************************************************
 *
 *      fstest.C  a client to test fstream_ext
 *
 ***************************************************/
#include "fstream_ext.h"
 using std::cout;
 using std::endl;

 int main()
 {
        fstream_ext filestr("testfile"); // create a file stream assiciated
                                // with the file 'testfile'
        filestr.close();
        return 0;
 }//main