From mboxrd@z Thu Jan  1 00:00:00 1970
From: "Martin v. Loewis" <martin@mira.isdn.cs.tu-berlin.de>
To: CHRISTIANII@prodigy.net
Cc: egcs-bugs@egcs.cygnus.com
Subject: Re: Is this a bug?
Date: Tue, 11 May 1999 23:44:00 -0000
Message-id: <199905120641.IAA00487@mira.isdn.cs.tu-berlin.de>
References: <000501be9c2c$c17c5e80$e712fdd1@john> <000501be9c2c$c17c5e80$e712fdd1@john>
X-SW-Source: 1999-05/msg00233.html
List-Id: <gcc-bugs.sourceware.org>

> Shouldn't it call Object::render(float, float, float)?  Instead,
> Triangle::render() overrides it!

No. Triangle::render does not override Object::render, it *hides*
Object::render. Stroustrup decided that if introduce a method in a
derived class, it might be confusing if a base method with the same
name would be called just because overload resolution finds it a
better method.

One way to get around this is

  Triangle t;
  Object *o = &t;
  o->render(0, 0, -5);

  Triangle t;
  t.render(0, 0, -5);

Another way would be a using declaration:

class Triangle
{
  float v[3][3];
public:
  virtual void move(float x, float y, float z);
  using Object::render;
  virtual void render();
};

Unfortunately, g++ currently rejects such code.

Please read your C++ book on inheritance and overloading.

Regards,
Martin