Apologies for typo, middle_c should publicly inherit base_c and top_c should
publicly inherit middle_c.
See corrected post.

Dean


---
[ comp.std.c++ is moderated.  To submit articles, try just posting with ]
[ your news-reader.  If that fails, use mailto:std-c++@ncar.ucar.edu    ]
[              --- Please see the FAQ before posting. ---               ]
[ FAQ: http://www.research.att.com/~austern/csc/faq.html                ]

I'm getting this error message when compiling the following code.

test.cc: In function `int main()':
test.cc:31: no matching function for call to `top_c::func (char)'
test.cc:20: candidates are: void top_c::func()

// ----- start of code ---------
#include <iostream>

class base_c
{
public:
  virtual void func()=0;
  virtual void func(char)=0;
};

class middle_c
{
public:
  void func() { cout << "middle_c::func()" << endl; };
  void func(char) { cout << "middle_c::func(char)" << endl; };
};

class top_c
{
public:
  void func() { cout << "top_c::func()" << endl; };
  /* void func(char);
   * use function inherited from middle_c
   */
};

int
main(/*...*/)
{
  top_c t;
  t.func();    // works
  t.func('x'); // problem: no matching function???
  return 0;
}

// ----- end of code ---------

Is this a language problem or a compiler problem?, and how do I get around
it?

TIA,
Dean


---
[ comp.std.c++ is moderated.  To submit articles, try just posting with ]
[ your news-reader.  If that fails, use mailto:std-c++@ncar.ucar.edu    ]
[              --- Please see the FAQ before posting. ---               ]
[ FAQ: http://www.research.att.com/~austern/csc/faq.html                ]

> class top_c
> {
> public:
>   void func() { cout << "top_c::func()" << endl; };
>   /* void func(char);
>    * use function inherited from middle_c
>    */
> };
>
The above comment is wrong.  Members are looked up by NAME (not
signature) then when the name is located, possible overloads are
examined.  func in the scope of top_c evaluates to top_c::func
which there is exactly one overload.

If you want to bring forward the middle_c definitions, you need
to do:

 class top_c {
 public:
    using middle_c::func;  // bring through middle_c func
    void func() { /* ... */ }  // add an overload for no arg case
 };

This is in the FAQ (you might find it better to start there).

---
[ comp.std.c++ is moderated.  To submit articles, try just posting with ]
[ your news-reader.  If that fails, use mailto:std-c++@ncar.ucar.edu    ]
[              --- Please see the FAQ before posting. ---               ]
[ FAQ: http://www.research.att.com/~austern/csc/faq.html                ]

Tue,  4 Sep 2001 15:24:35 GMT, Dean Wakerley <dean@housefloors.co.uk> pis=
ze:

> class top_c
> {
> public:
>   void func() { cout << "top_c::func()" << endl; };
>   /* void func(char);
>    * use function inherited from middle_c
>    */

It doesn't inherit from middle_c.

--=20
 __("<  Marcin Kowalczyk * qrczak@knm.org.pl http://qrczak.ids.net.pl/
 \__/
  ^^                      SYGNATURA ZAST=CAPCZA
QRCZAK

---
[ comp.std.c++ is moderated.  To submit articles, try just posting with ]
[ your news-reader.  If that fails, use mailto:std-c++@ncar.ucar.edu    ]
[              --- Please see the FAQ before posting. ---               ]
[ FAQ: http://www.research.att.com/~austern/csc/faq.html                ]