Re: c++/4755: virtual abstract member function

Re: c++/4755: virtual abstract member function

[neil]

Synopsis: virtual abstract member function

State-Changed-From-To: open->closed
State-Changed-By: neil
State-Changed-When: Wed Oct 31 08:21:06 2001
State-Changed-Why:
    Not a bug.  There is nothing wrong with your code from the
    compiler's point of view, so it cannot help.  Any help must
    come from the linker, and should be reported as a bug to
    the creators of your linker.

http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&pr=4755&database=gcc

c++/4755: virtual abstract member function

[petridis]

>Number:         4755
>Category:       c++
>Synopsis:       virtual abstract member function
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    unassigned
>State:          open
>Class:          wrong-code
>Submitter-Id:   net
>Arrival-Date:   Wed Oct 31 07:56:00 PST 2001
>Closed-Date:
>Last-Modified:
>Originator:     Sergios
>Release:        gcc version 3.0
>Organization:
>Environment:
windows 2000, cygwin
>Description:
Hi, 

I'm not certain that this should be considered as a bug. However it is the only case that I now, where when calling a virtual member function that is declared as abstract (=0),
the linker (and not the compiler) produces the error.

This can be confusing, when a big number of nested classes is involved.

Hope I helped !
>How-To-Repeat:
struct A
{
  virtual int f() = 0;
};

struct B : A
{
  int f()
  { 
    return A::f();
  };
};

int main()
{

  B t;
};
>Fix:
The linker message is informative enough
>Release-Note:
>Audit-Trail:
>Unformatted: