Re: c++/8577: postfix operator not inherithed

Re: c++/8577: postfix operator not inherithed

[nathan]

Synopsis: postfix operator not inherithed

State-Changed-From-To: open->closed
State-Changed-By: nathan
State-Changed-When: Thu Nov 14 00:37:57 2002
State-Changed-Why:
    not a bug. B's operator++ function hides those of the base.
    You need a using declaration.

http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=8577

Re: c++/8577: postfix operator not inherithed

[Gabriel Dos Reis]

The following reply was made to PR c++/8577; it has been noted by GNATS.

From: Gabriel Dos Reis <gdr@integrable-solutions.net>
To: Delana.Lorenzo@libero.it
Cc: gcc-gnats@gcc.gnu.org
Subject: Re: c++/8577: postfix operator not inherithed
Date: 14 Nov 2002 15:06:02 +0100

 Delana.Lorenzo@libero.it writes:
 
 [...]
 
 | >Class:          sw-bug
 
 This is not a bug.
 
 [...]
 
 | class A
 | {
 | public:
 | virtual void toimplement () = 0;
 | void implemented () { toimplement(); }
 | virtual void operator ++ () = 0;
 | void operator ++ (int) { printf ("Postfix inc\n"); }
 | };
 | 
 | class B : public A {
 | public:
 | void toimplement () { printf ("IMPLEMENTATION of pure\n"); }
 | void operator ++ () { printf ("Prefix inc\n"); }
        ^^^^^^^^^^^
 
 This hides the name of the postfix function in A.
 
 In short: don't overload a virtual function.
 
 -- Gaby

c++/8577: postfix operator not inherithed

[Delana.Lorenzo]

>Number:         8577
>Category:       c++
>Synopsis:       postfix operator not inherithed
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Wed Nov 13 22:46:00 PST 2002
>Closed-Date:
>Last-Modified:
>Originator:     Delana.Lorenzo@libero.it
>Release:        gcc-3.2
>Organization:
>Environment:
Linux
>Description:
#include <iostream>
using namespace std;

class A
{
public:
virtual void toimplement () = 0;
void implemented () { toimplement(); }
virtual void operator ++ () = 0;
void operator ++ (int) { printf ("Postfix inc\n"); }
};

class B : public A {
public:
void toimplement () { printf ("IMPLEMENTATION of pure\n"); }
void operator ++ () { printf ("Prefix inc\n"); }
};

int
main ()
{
  B b;
b.implemented ();
++b;
b++; // b not inherit the implemented A baseclass level postfix operator
}
>How-To-Repeat:
compile simple source code
>Fix:

>Release-Note:
>Audit-Trail:
>Unformatted: