From: Luis Espinal <lespin03@solix.fiu.edu>
Subject: Re: C++ Class [ not a good answer ]
Date: 1997/03/03
Date: 1997-03-03T00:00:00+00:00 [thread overview]
Message-ID: <331B1B88.612E@solix.fiu.edu> (raw)
In-Reply-To: 5dsgh1$hlt@nnrp1.farm.idt.net
> Read about polymorphism and virtual functions.
>
This is a better answer to the original question.
Lock Minh, what you need is a class that has at least one pure virtual
function in it. That way, nobody can instantiate an object from it and
still use it as a base class.
.ie.
class MyBase
{
MyBase(){...}
virtual ~MyBase(){ ... }
virtual void SomeFunction() = 0; // a pure virtual function.
};
// you still need to implement the pure virtual func.
void MyBase::SomeFunction(){}
class AChild : public MyBase
{
... here goes the constructors, destructors, etc.
// you need to implement the pure virtual function
// defined in MyBase; otherwise, you won't be
// able to instantiate a AChild object either.
virtual void SomeFunction();
};
void AChild::SomeFunction()
{
// some code in here.
}
AChild someChild; // ok...
MyBase someBase; // eeek! can't compile.
// can't instantiate a class with
// a pure virtual function in it.
Hope it helps.
Luis Espinal
p.s. cryptic answers don't help.
--
Luis++ lespin03@solix.fiu.edu
What does not kill us, makes us stronger...
What does not break us, makes us...
That which does not break, must bend...
next prev parent reply other threads:[~1997-03-03 0:00 UTC|newest]
Thread overview: 260+ messages / expand[flat|nested] mbox.gz Atom feed top
1997-01-01 0:00 What is wrong with OO ? Ell
1997-01-01 0:00 ` Jon S Anthony
1997-01-02 0:00 ` Robert C. Martin
1997-01-03 0:00 ` Eirik Mangseth
1997-01-03 0:00 ` What is wrong with OO O X g Greg Comeau
1997-01-04 0:00 ` OO, C++, and something much better! John (Max) Skaller
1997-01-04 0:00 ` vlad
1997-01-05 0:00 ` Mike Anderson
1997-01-06 0:00 ` Chris Brand
1997-01-06 0:00 ` Stanley Allen
1997-01-09 0:00 ` Jon S Anthony
1997-01-08 0:00 ` Robert I. Eachus
1997-01-09 0:00 ` Bertrand Meyer
1997-01-27 0:00 ` Richard Riehle
1997-01-10 0:00 ` Robert I. Eachus
1997-01-10 0:00 ` Robb Nebbe
1997-01-03 0:00 ` What is wrong with OO ? Jon S Anthony
1997-01-03 0:00 ` Matt Austern
1997-01-04 0:00 ` OO, C++, and something much better! Pieter Schoenmakers
1997-01-04 0:00 ` What is wrong with OO ? Valerie Torres
1997-01-06 0:00 ` Bart Samwel
1997-01-08 0:00 ` Robert Dewar
1997-01-09 0:00 ` Bertrand Meyer
1997-01-09 0:00 ` Robert Dewar
1997-01-10 0:00 ` Fergus Henderson
1997-01-10 0:00 ` Robert Dewar
1997-01-12 0:00 ` Fergus Henderson
1997-01-09 0:00 ` Ken Garlington
1997-01-09 0:00 ` Jay Martin
1997-01-09 0:00 ` Robert Dewar
1997-01-10 0:00 ` Jay Martin
1997-01-12 0:00 ` Robert Dewar
1997-01-15 0:00 ` Laurent Gasser
1997-01-15 0:00 ` Jonas Nygren
1997-01-17 0:00 ` Tom Bushell
1997-01-17 0:00 ` Michael Malak
1997-01-17 0:00 ` Kent Budge, sandia,
1997-01-17 0:00 ` Eirik Mangseth
1997-01-15 0:00 ` Jay Martin
1997-01-10 0:00 ` Fergus Henderson
1997-01-10 0:00 ` Ken Garlington
1997-01-10 0:00 ` Robert Dewar
1997-01-12 0:00 ` Fergus Henderson
1997-01-12 0:00 ` Robert Dewar
1997-01-10 0:00 ` Jay Martin
1997-01-10 0:00 ` Joe Buck
1997-01-11 0:00 ` Jay Martin
1997-01-12 0:00 ` Slavik Zorin
1997-01-11 0:00 ` Piercarlo Grandi
1997-01-12 0:00 ` Thierry Goubier
1997-01-14 0:00 ` Piercarlo Grandi
1997-01-14 0:00 ` Vos nom et pr�nom
1997-01-16 0:00 ` Mark Woodruff
1997-01-17 0:00 ` Piercarlo Grandi
1997-01-09 0:00 ` William Clodius
1997-01-09 0:00 ` Simon Willcocks
1997-01-09 0:00 ` Robert Dewar
1997-01-09 0:00 ` Ken Garlington
1997-01-09 0:00 ` Fergus Henderson
1997-01-09 0:00 ` Robert Dewar
1997-01-10 0:00 ` Fergus Henderson
1997-01-10 0:00 ` Robert Dewar
1997-01-09 0:00 ` Richie Bielak
1997-01-10 0:00 ` Fergus Henderson
1997-01-10 0:00 ` Bart Samwel
1997-01-10 0:00 ` Robert Dewar
1997-01-10 0:00 ` Michael Malak
1997-01-10 0:00 ` Bart Samwel
1997-01-12 0:00 ` Fergus Henderson
1997-01-09 0:00 ` Bjarne Stroustrup
1997-01-11 0:00 ` Robert Dewar
1997-01-15 0:00 ` Bjarne Stroustrup
1997-01-19 0:00 ` Jay Martin
1997-01-27 0:00 ` Robert C. Martin
1997-01-30 0:00 ` Damon Feldman
1997-01-20 0:00 ` Richard A. O'Keefe
1997-01-21 0:00 ` John W. Sarkela
1997-01-23 0:00 ` Piercarlo Grandi
1997-01-23 0:00 ` Bertrand Meyer
1997-01-24 0:00 ` language marketing question, was " Tom Moran
[not found] ` <5cpdh8$mau@news.csus.edu>
[not found] ` <5cs3un$14b4@uni.library.ucla.edu>
[not found] ` <rmartin-3101971753460001@pool15-027.wwa.com>
[not found] ` <5cu5ig$10fk@uni.library.ucla.edu>
[not found] ` <5dao0p$gri@decius.ultra.net>
[not found] ` <yf3n2th488t.fsf@sabi.demon.co.uk>
1997-02-11 0:00 ` Worse is better, was: Language marketing question Bob Haugen
1997-02-11 0:00 ` Donald M. MacQueen
1997-02-11 0:00 ` Lee Willis
[not found] ` <yf3rait49b9.fsf@sabi.demon.co.uk>
[not found] ` <01bc183b$fd091820$1544db03@gecmf-pc-eddjab.gecmf.capital.ge.com>
1997-02-13 0:00 ` language marketing question, was Re: What is wrong with OO ? Robert Dewar
1997-01-25 0:00 ` Damon Feldman
1997-01-26 0:00 ` Sean Case
1997-01-26 0:00 ` William Grosso
1997-01-28 0:00 ` Paul Keister
1997-01-28 0:00 ` Dann Corbit
1997-01-12 0:00 ` Fergus Henderson
1997-01-13 0:00 ` Bart Samwel
1997-01-12 0:00 ` Matt Telles
1997-01-15 0:00 ` Bjarne Stroustrup
1997-01-19 0:00 ` Matthew Heaney
1997-01-14 0:00 ` Vos nom et pr�nom
1997-01-16 0:00 ` Patrick Doyle
1997-01-16 0:00 ` Risto Lankinen
1997-01-16 0:00 ` Patrick Doyle
1997-01-16 0:00 ` Risto Lankinen
1997-01-18 0:00 ` Robert C. Martin
[not found] ` <01bc0269$3fd55b20$ca61e426@DCorbit.solutionsiq.com>
1997-02-10 0:00 ` richard
1997-02-10 0:00 ` Nick Leaton
[not found] ` <3303A993.759E@pratique.fr>
1997-02-21 0:00 ` Nick Leaton
1997-02-21 0:00 ` Nick Leaton
1997-02-22 0:00 ` Fergus Henderson
1997-02-10 0:00 ` Robert Dewar
1997-01-20 0:00 ` David Emery
[not found] ` <dewar.852772995@mer <dewar.852833957@merv>
1997-01-10 0:00 ` Simon Willcocks
1997-01-10 0:00 ` Robert Dewar
1997-01-10 0:00 ` Marky Mark
1997-01-10 0:00 ` Robert Dewar
1997-01-12 0:00 ` Fergus Henderson
1997-01-12 0:00 ` Josh Stern
1997-01-12 0:00 ` Martin ELLISON
1997-01-14 0:00 ` Piercarlo Grandi
1997-01-17 0:00 ` Lawrence G. Mayka
1997-01-19 0:00 ` Piercarlo Grandi
1997-01-19 0:00 ` Exceptions as objects (was Re: What is wrong with OO ?) Patrick Doyle
1997-01-25 0:00 ` Piercarlo Grandi
1997-01-25 0:00 ` Ronald E Jeffries
1997-01-25 0:00 ` Bryan Dollery
1997-01-25 0:00 ` Robert A Duff
1997-01-28 0:00 ` Piercarlo Grandi
1997-01-29 0:00 ` Robert A Duff
1997-01-29 0:00 ` John W. Sarkela
[not found] ` <yf33evav882.fsf@sabi.demon.co.uk>
[not found] ` <32FA58AD.2D96@enfish.com>
1997-02-12 0:00 ` Piercarlo Grandi
1997-01-30 0:00 ` Lawrence G. Mayka
1997-01-30 0:00 ` Robert Dewar
1997-01-29 0:00 ` John (Max) Skaller
1997-01-28 0:00 ` Piercarlo Grandi
1997-01-25 0:00 ` Paul Kyzivat
1997-01-25 0:00 ` Robert A Duff
1997-01-25 0:00 ` Robert A Duff
1997-01-28 0:00 ` Piercarlo Grandi
1997-01-28 0:00 ` Piercarlo Grandi
[not found] ` <5cu43v$jkn@nntpa.cb.lucent.com>
[not found] ` <5d93d3$nhs$1@goanna.cs.rmit.edu.au>
1997-02-07 0:00 ` Robert A Duff
[not found] ` <5dds5b$gcs@mulga.cs.mu.OZ.AU>
[not found] ` <01bc14ab$3ce476e0$752d54c7@vbykov.hip.cam.org>
1997-02-07 0:00 ` Robert A Duff
1997-02-10 0:00 ` Vassili Bykov
[not found] ` <5def36$rjd@mulga.cs.mu.OZ.AU>
1997-02-07 0:00 ` Vassili Bykov
1997-02-07 0:00 ` Bill Gooch
1997-02-07 0:00 ` Vassili Bykov
1997-02-08 0:00 ` Fergus Henderson
1997-02-08 0:00 ` Piercarlo Grandi
1997-02-08 0:00 ` Piercarlo Grandi
1997-02-11 0:00 ` Vassili Bykov
1997-02-07 0:00 ` Patrick Doyle
[not found] ` <5de57h$dm3$1@goanna.cs.rmit.edu.au>
1997-02-09 0:00 ` Fergus Henderson
[not found] ` <yf3ybd14qn4.fsf@sabi.demon.co.uk>
[not found] ` <5de797$1ksa@uni.library.ucla.edu>
1997-02-07 0:00 ` Piercarlo Grandi
1997-02-08 0:00 ` Jay Martin
1997-01-06 0:00 ` OO, C++, and something much better! Ole-Hjalmar Kristensen FOU.TD/DELAB
1997-01-06 0:00 ` Michael F Brenner
1997-01-06 0:00 ` Tucker Taft
1997-01-07 0:00 ` Robert Dewar
1997-01-07 0:00 ` Ada Generics (was Re: OO, C++, and something much better!) Bob Gilbert
1997-01-07 0:00 ` Robert Dewar
1997-01-08 0:00 ` OO, C++, and something much better! Robert Dewar
1997-01-07 0:00 ` Andrew Koenig
1997-01-10 0:00 ` Norman H. Cohen
1997-01-07 0:00 ` Jay Martin
1997-01-08 0:00 ` Ken Garlington
1997-01-08 0:00 ` Robert Dewar
1997-01-08 0:00 ` Robert Dewar
1997-01-09 0:00 ` Ted Dennison
1997-01-12 0:00 ` Richard Riehle
1997-01-07 0:00 ` What is wrong with OO ? Jon S Anthony
1997-01-11 0:00 ` Bjarne Stroustrup
1997-01-21 0:00 ` rharlos*cybercomm.net
1997-02-10 0:00 ` richard
1997-02-10 0:00 ` Charles A. Jolley
1997-02-11 0:00 ` Robert Dewar
1997-02-12 0:00 ` C++ Class Loc Minh Phan Van
1997-02-12 0:00 ` William Ying
1997-02-12 0:00 ` Ron Smith
1997-02-12 0:00 ` John Kapson [C]
1997-02-12 0:00 ` Kevin J. Hopps
1997-02-12 0:00 ` Aaron J Margosis
1997-02-12 0:00 ` Jason Shankel
1997-02-12 0:00 ` Keith P. Boruff
1997-02-12 0:00 ` Vlastimil Adamovsky
1997-03-03 0:00 ` Luis Espinal [this message]
1997-03-06 0:00 ` C++ Class [ not a good answer ] Tom Plunket
1997-02-12 0:00 ` C++ Class Kent Tong
1997-02-12 0:00 ` Paul Kenneth Egell-Johnsen
1997-02-13 0:00 ` Lee, Shih Hao
1997-02-17 0:00 ` What is wrong with OO ? Sam Inala
1997-02-17 0:00 ` Robert Dewar
1997-02-15 0:00 ` Piercarlo Grandi
1997-02-11 0:00 ` Vlastimil Adamovsky
1997-01-07 0:00 ` Jon S Anthony
1997-01-07 0:00 ` OO, C++, and something much better! Stanley Allen
1997-01-07 0:00 ` Robert Dewar
1997-01-07 0:00 ` Bertrand Meyer
1997-01-08 0:00 ` Ken Garlington
1997-01-08 0:00 ` Matthew Heaney
1997-01-10 0:00 ` Keith Thompson
1997-01-10 0:00 ` Robert Dewar
1997-01-10 0:00 ` Robert Dewar
1997-01-15 0:00 ` Richard Kenner
1997-01-15 0:00 ` Fergus Henderson
1997-01-20 0:00 ` Andrew Koenig
1997-01-25 0:00 ` Robert Dewar
1997-01-15 0:00 ` Ole-Hjalmar Kristensen FOU.TD/DELAB
1997-01-08 0:00 ` Kohler Markus
1997-01-08 0:00 ` David Emery
1997-01-09 0:00 ` Don Harrison
1997-01-10 0:00 ` Marky Mark
1997-01-14 0:00 ` Don Harrison
1997-01-08 0:00 ` Jon S Anthony
1997-01-08 0:00 ` Mark A Biggar
1997-01-09 0:00 ` Don Harrison
1997-01-10 0:00 ` Roy Phillips
1997-01-27 0:00 ` Nick Leaton
1997-01-28 0:00 ` matthew mclellan
1997-01-09 0:00 ` Don Harrison
1997-01-09 0:00 ` Robert Dewar
1997-01-10 0:00 ` Ken Garlington
1997-01-10 0:00 ` Bart Samwel
1997-01-10 0:00 ` Robert Dewar
1997-01-10 0:00 ` Norman H. Cohen
1997-01-13 0:00 ` Don Harrison
1997-01-13 0:00 ` Robert Dewar
1997-01-14 0:00 ` Don Harrison
1997-01-13 0:00 ` Ken Garlington
1997-01-13 0:00 ` Norman H. Cohen
1997-01-13 0:00 ` Robert Dewar
1997-01-15 0:00 ` Ken Garlington
1997-01-17 0:00 ` Keith Thompson
1997-01-16 0:00 ` Keith Thompson
1997-01-16 0:00 ` Ken Garlington
1997-01-14 0:00 ` Michael F Brenner
1997-01-14 0:00 ` Don Harrison
1997-01-10 0:00 ` Jon S Anthony
1997-01-13 0:00 ` Don Harrison
1997-01-13 0:00 ` Robert I. Eachus
1997-01-15 0:00 ` Don Harrison
1997-01-13 0:00 ` Don Harrison
1997-01-14 0:00 ` Jeff Carter
1997-01-15 0:00 ` Don Harrison
1997-01-17 0:00 ` Jon S Anthony
1997-01-17 0:00 ` Norman H. Cohen
1997-01-18 0:00 ` Patrick Doyle
1997-01-20 0:00 ` Jon S Anthony
1997-01-10 0:00 ` Jon S Anthony
1997-01-10 0:00 ` What is wrong with OO ? Robert I. Eachus
1997-01-12 0:00 ` Piercarlo Grandi
1997-01-10 0:00 ` OO, C++, and something much better! Matt Austern
1997-01-10 0:00 ` What is wrong with OO ? Pieter Schoenmakers
1997-01-12 0:00 ` Fergus Henderson
1997-01-12 0:00 ` Chris Morgan
1997-01-12 0:00 ` Chris Morgan
1997-01-11 0:00 ` Robert Dewar
1997-01-13 0:00 ` ak
1997-01-13 0:00 ` Pieter Schoenmakers
1997-01-13 0:00 ` Fergus Henderson
1997-01-13 0:00 ` Chris Morgan
1997-01-23 0:00 ` Ulrich Windl
1997-01-23 0:00 ` Chris Bitmead
1997-01-23 0:00 ` Bertrand Meyer
1997-01-26 0:00 ` Piercarlo Grandi
1997-01-08 0:00 ` Richard A. O'Keefe
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