[comp.lang.pascal] Question about Object Initialization

TPC%IUP.BITNET@uga.cc.uga.edu (Tom Cunningham, Computer Science Department) (05/03/91)

Hi:

     If your are also on Pascal-L@YaleVM, you saw this question yesterday.


     In the Turbo Pascal 6.0 User's Guide, page 102, is the following statement:

"Each individual instance of an object must be initialized by a separate
constructor call.  It is not sufficient to initialize one instance of an object
and then assign that instance to additional instances."

     Why??  How are objects implemented?

     If X and Y are of the same object type and X has been initialized using a
constructor, then why doesn't  Y := X  assign the current values of X to Y,
including the address of the Virtual Methods Table for this object type?

Tom
------------------------------------------------------------------------------
  Martin's Law:  You can't learn anything unless you almost know it already.
------------------------------------------------------------------------------
 Thomas P. Cunningham, Associate Professor     BitNet:    TPC@IUP
 Computer Science Department                   DNS (mx)   TPC@Grove.IUP.Edu
 Indiana University of Pennsylvania            Desk:      412-357-2463
 Indiana, Pennsylvania    15705-1087           Office:    412-357-2524
   >> Jimmy Stewart's hometown <<              FAX:       Upon Request
//+  25 25 25 25 25 25 53 53 143 36 36 36 36 36 36 36 36 36 36 36 36 36 213 213,
//+  90 506 506 506 22 104 104 104 13 13 13 13 13 57 57 57 130 130 99 76 76 48 ,
//PASCAL-L JOB Echo=No,Reply-to="OEBL8724@TREARN TURGUT@TREARN"
//To DD *
MDM1875C APSU "MICHAEL D. MARTIN"
MMALIK MEMSTVX1 Mansoor A. Malik
JMROBERT UALR "Jon Robertson"
Z06002 BBRBFU01 Jan Q. Janssens
GRAD205 BRFUEM Students of Mathematics in BRFUEM
88232336 BRUFSC Pablo Ernesto Vigneaux Wilton
PRDESENV%VENUS.CPQD.ANSP.BR UICVM.UIC.EDU Claudio Max
CTEDTC22 BRUFPB GENILDO MEDEIROS CHACON
WOJASINS BUTLERU Bob Wojasinski
WKOK CALSTATE WOON KOK
operfilo CC.UNIZAR.ES miguel angel blasco
ZCCBJSB EB0UB011 Josep Sau B.
Olaskoaga_Goenaga_Borja EUSKOM.SPRITEL.ES borja olaskoaga
DRSABAC CFRVM James Saunders
djohnson CH3.INTEL.COM Don Johnson
MWILDER FRMNVAX1 Mike Wilder
prog HP.UWSUPER.EDU Patty Rog
nacer HPMCAA.MCM.HP.COM nacer m.
SYNAPSE LCC.EDU Freank Swierz
0003310988 MCIMAIL.COM Mustafa Soysal
okcusr!hpn MWOOD.ATT.COM Huy Nguyen
dukelow PEANUTS.NOSC.MIL Robert A. Dukelow.
pfunke QA1.PICA.ARMY.MIL Eric W. Pfunke
ZAWADZME%WBLYC%dupont.com RELAY.CS.NET MARK ZAWADZKI
mark RIA-EMH2.ARMY.MIL Mark McKamey
jer RSCH.OCLC.ORG john ray
hqsachcx SACEMNET.AF.MIL Dominick Scalzitti
ROSTEN_AJ USP.AC.NZ Alan J.Rosten
INFO-PASCAL VIM.BRL.MIL P L
SK1925 CMSUVMB steven kirby
S101298 UMRVMA Brian Olsen
SOFTH CSPUNI12 Tomik HOLAN
STEFAN.SCHROER CYBER.URZ.UNI-WUPPERTAL.DBP.DE Stefan Schroer
C0030006 DBSTU1 Joachim Lohoff-Werner
I2010506 DBSTU1 Christian Boettger, TU Braunschweig, FRG
XCT1HASS DDATHD21 Frank Hassel
GPARTOS DGIHRZ01 G. Partosch, U Giessen, FRG
URZ45 DMSWWU1A michael gloger
RICHTER DMZNAT51 Alfred Richter
150786 DOLUNI1 ulf gieseke
DUENTSCH DOSUNI1 Ivo Duentsch
a0045 RRZ.UNI-KOELN.DE Jochen Roderburg
schickram VAX1.RZ.UNI-REGENSBURG.DBP.DE michael schickram
HERDE DHDEMBL PATRICK HERDE
UKH8 DKAUNI2 G. Augustin
EISENBAR DULRUU51 M. Eisenbarth
winfmni DUTICAI.TUDELFT.NL Mark Nieuwmans
BRAND HDETNO51 JOS VAN DEN BRAND
RCIVDAB HDETUD1 Dim Biesheuvel
IVAAJE HEITUE51 ALEXANDER VD EIJNDE
PHARMAIL HGRRUG5 Paul B vd Berg
CRISMO HLERUL2 Maarten Ouwehand
PLUIMERS HLERUL5Z Jeroen W. Pluimers
ANDRE HROEUR51 ANDRE SPRUIT
S89405079 HSEPM1.HSE.NL Edwin Groothuis
Jaap.VanGinkel HTO.RHY.NL Jaap van Ginkel
Taco.Graafsma HTO.RHY.NL Taco Graafsma
ANNEKE HUTRUU54 ANNEKE SICHERERROETMAN
WESSEL VOEDING.TNO.NL Wessel Zweers
ECOAV ECOSTAT.AAU.DK Arne Vajhxj
steinbal RHI.HI.IS Steinthor Baldursson
LMSMITH ECUVM1 Bob Smith
KBAHGAT EGIDSCVM KHALED BAHGAT
ETIP355 FRCIRP81 Gilles DUMORTIER
BOURREZ FRECP12 Etienne Bourrez
MORROW ETSUACAD Charles Morrow
JOHNV FHCRCVM John(Johan) VanDamme
RGATES OREGON "Rick Gates - Univ. of Oregon"
STENDAHL PLU0 Svend G. Stendahl
TJ GACVAX1 T.J. Morrison
TODD GRIN1 "Ermine Todd III"
sbarnhar MAILBOX.MAIL.UMN.EDU Shawn Barnhart
ROGER UWYO Roger Taylor, Jr. - Western Wyoming College
JOHNSONK WISCAGE Kirk Johnson
S169126 GBURG Michael Schuler
REBNLYA IUP Kevin Fizz
TPC IUPOAK Thomas P. Cunningham
CEBZ11 GRTHEUN1 Pandelis Theodosiou
GEBZ0703 GRTHEUN1 george kopalidis
OPRGLS GSUVM1 Greg Shoemaker
bj_stedm G2.BRISPOLY.AC.UK Bruce Stedman
CC_S460 TITAN.KING.AC.UK Local Redistribution
KBUBI HUJIVM1 Ilan Ben-Melech
VVMOTI WEIZMANN Holzman Moti
G2YTNGD1 ICINECA Paolo Furlani
GERMANO IVRUNIV Germano Rossi
MCINF05 IGECUNIV taxi soft
S3ADM IMERJ Paulo C. C. Hauer
KINSELLA IRTCCARL Austin Kinsella
sasha KRYPTON.STANFORD.EDU Sasha Lifson
butt SUMEX-AIM.STANFORD.EDU Abee Jan
EWINOGRAD%CCNODE VAXF.COLORADO.EDU "Ed Winograd"
CB#0 LAFAYACS BILL COLLINS
GG30 LAFAYACS GABRIEL T. GAGLIANO
pascal-l LANDOVER.PP.FI Jari Dahlgren
ERVIN MOREKYPR Bob Callahan
BESKO MSUNSCL LISA BESKO
LMARSHA WAYNEST1 Laurie Marshall
SVVAIKUN OWUCOMCN "Ram Samudrala"
raj PIC.UCLA.EDU RAJ CHAUDHURY
EEC01001 UFRJ eduardo paiva
MAB01021 UFRJ andre gares
MAD01009 UFRJ max oliver
AK PLWRTU11 Andrzej KALIS
MEF3031 SAKAAU03 Joan Brown
SCP3006 SAKAAU03 sub Charles Markoni
6600john%ucsbuxa.ucsb.edu%ucsbuxa SBITP John Bernstein
CETEK63 TECHNION shahar steiff
V4039 TEMPLEVM Stan Horwitz
7822034 TWNCTU01 Paul Lin
NCHUS038 TWNMOE10 Tsang-Hae Chyan
R9503151 TWNTUCC1 Supreme Monster
GM06091 UAFSYSB Gerald W. McCollum
ARAVIRE UCHDCI01 roberto aravire
GOULDC UDEM CHARLES GOULD
UNCPJS UNC Peter J. Schledorn
C0361 UNIVSCVM Thomas Jenkins
JURBINA1 USACHVM1 jorge urbina fuentes
LISTVIR USACHVM1 Gonzalo M. Rojas Costa
RECHEVER USACHVM1 ricardo echeverria
INGRAM USMCP6 "Jonathan W. Ingram
SOSDUNN VM.UOGUELPH.CA Les Dunn
CH297298 VMTECMEX Gustavo Alonso Garcia
EMDAVID VMTECMEX David Alarid
EM306492 VMTECMEX LUIS MORIN
EM435685 VMTECMEX Artemio Carranza
EM436025 VMTECMEX Eduardo Flores
AL282247 VMTECSLP J Picazzo
20950709 VUVAXCOM Jim Mc Ree
GSMIL1 WMVM1 greg miller
00125425 YSUB Vincent M. Tkac
EVESNIC YUBGEF51 Robert Nedjeral
/*
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//+  25 25 25 25 25 25 53 53 143 36 36 36 36 36 36 36 36 36 36 36 36 36 213 213,
//+  90 506 506 506 22 104 104 104 13 13 13 13 13 57 57 57 130 130 99 76 76 48 ,
//+ 48 146 146 75 222 10 195 195 195 46 46 7 170 198 198 217 200 200 200 200 51,
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//+ 102 102:2,22 101:2,51 56:2 194:2,51,84 144:16)
//Via DD "TREARN"
//Data DD *,EOF,Res=Disk
Date:         Fri, 3 May 91 09:40:00 EDT
Reply-To:     Pascal Language Discussion List <PASCAL-L@TREARN>
Sender:       Pascal Language Discussion List <PASCAL-L@TREARN>
From:         "Tom Cunningham, Computer Science Department" <TPC@IUP>
Subject:      Question about Object Initialization
To:

Hi:

     If your are also on Pascal-L@YaleVM, you saw this question yesterday.


     In the Turbo Pascal 6.0 User's Guide, page 102, is the following statement:

"Each individual instance of an object must be initialized by a separate
constructor call.  It is not sufficient to initialize one instance of an object
and then assign that instance to additional instances."

     Why??  How are objects implemented?

     If X and Y are of the same object type and X has been initialized using a
constructor, then why doesn't  Y := X  assign the current values of X to Y,
including the address of the Virtual Methods Table for this object type?

Tom
------------------------------------------------------------------------------
  Martin's Law:  You can't learn anything unless you almost know it already.
------------------------------------------------------------------------------
 Thomas P. Cunningham, Associate Professor     BitNet:    TPC@IUP
 Computer Science Department                   DNS (mx)   TPC@Grove.IUP.Edu
 Indiana University of Pennsylvania            Desk:      412-357-2463
 Indiana, Pennsylvania    15705-1087           Office:    412-357-2524
   >> Jimmy Stewart's hometown <<              FAX:       Upon Request
//+  25 25 25 25 25 25 53 53 143 36 36 36 36 36 36 36 36 36 36 36 36 36 213 213,
//PASCAL-L JOB Echo=No,Reply-to="OEBL8724@TREARN TURGUT@TREARN"
//To DD *
MDM1875C APSU "MICHAEL D. MARTIN"
MMALIK MEMSTVX1 Mansoor A. Malik
JMROBERT UALR "Jon Robertson"
Z06002 BBRBFU01 Jan Q. Janssens
GRAD205 BRFUEM Students of Mathematics in BRFUEM
88232336 BRUFSC Pablo Ernesto Vigneaux Wilton
PRDESENV%VENUS.CPQD.ANSP.BR UICVM.UIC.EDU Claudio Max
CTEDTC22 BRUFPB GENILDO MEDEIROS CHACON
WOJASINS BUTLERU Bob Wojasinski
WKOK CALSTATE WOON KOK
operfilo CC.UNIZAR.ES miguel angel blasco
ZCCBJSB EB0UB011 Josep Sau B.
Olaskoaga_Goenaga_Borja EUSKOM.SPRITEL.ES borja olaskoaga
DRSABAC CFRVM James Saunders
djohnson CH3.INTEL.COM Don Johnson
MWILDER FRMNVAX1 Mike Wilder
prog HP.UWSUPER.EDU Patty Rog
nacer HPMCAA.MCM.HP.COM nacer m.
SYNAPSE LCC.EDU Freank Swierz
0003310988 MCIMAIL.COM Mustafa Soysal
okcusr!hpn MWOOD.ATT.COM Huy Nguyen
dukelow PEANUTS.NOSC.MIL Robert A. Dukelow.
pfunke QA1.PICA.ARMY.MIL Eric W. Pfunke
ZAWADZME%WBLYC%dupont.com RELAY.CS.NET MARK ZAWADZKI
mark RIA-EMH2.ARMY.MIL Mark McKamey
jer RSCH.OCLC.ORG john ray
hqsachcx SACEMNET.AF.MIL Dominick Scalzitti
ROSTEN_AJ USP.AC.NZ Alan J.Rosten
INFO-PASCAL VIM.BRL.MIL P L
SK1925 CMSUVMB steven kirby
S101298 UMRVMA Brian Olsen
SOFTH CSPUNI12 Tomik HOLAN
STEFAN.SCHROER CYBER.URZ.UNI-WUPPERTAL.DBP.DE Stefan Schroer
C0030006 DBSTU1 Joachim Lohoff-Werner
I2010506 DBSTU1 Christian Boettger, TU Braunschweig, FRG
XCT1HASS DDATHD21 Frank Hassel
GPARTOS DGIHRZ01 G. Partosch, U Giessen, FRG
URZ45 DMSWWU1A michael gloger
RICHTER DMZNAT51 Alfred Richter
150786 DOLUNI1 ulf gieseke
DUENTSCH DOSUNI1 Ivo Duentsch
a0045 RRZ.UNI-KOELN.DE Jochen Roderburg
schickram VAX1.RZ.UNI-REGENSBURG.DBP.DE michael schickram
HERDE DHDEMBL PATRICK HERDE
UKH8 DKAUNI2 G. Augustin
EISENBAR DULRUU51 M. Eisenbarth
winfmni DUTICAI.TUDELFT.NL Mark Nieuwmans
BRAND HDETNO51 JOS VAN DEN BRAND
RCIVDAB HDETUD1 Dim Biesheuvel
IVAAJE HEITUE51 ALEXANDER VD EIJNDE
PHARMAIL HGRRUG5 Paul B vd Berg
CRISMO HLERUL2 Maarten Ouwehand
PLUIMERS HLERUL5Z Jeroen W. Pluimers
ANDRE HROEUR51 ANDRE SPRUIT
S89405079 HSEPM1.HSE.NL Edwin Groothuis
Jaap.VanGinkel HTO.RHY.NL Jaap van Ginkel
Taco.Graafsma HTO.RHY.NL Taco Graafsma
ANNEKE HUTRUU54 ANNEKE SICHERERROETMAN
WESSEL VOEDING.TNO.NL Wessel Zweers
ECOAV ECOSTAT.AAU.DK Arne Vajhxj
steinbal RHI.HI.IS Steinthor Baldursson
LMSMITH ECUVM1 Bob Smith
KBAHGAT EGIDSCVM KHALED BAHGAT
ETIP355 FRCIRP81 Gilles DUMORTIER
BOURREZ FRECP12 Etienne Bourrez
MORROW ETSUACAD Charles Morrow
JOHNV FHCRCVM John(Johan) VanDamme
RGATES OREGON "Rick Gates - Univ. of Oregon"
STENDAHL PLU0 Svend G. Stendahl
TJ GACVAX1 T.J. Morrison
TODD GRIN1 "Ermine Todd III"
sbarnhar MAILBOX.MAIL.UMN.EDU Shawn Barnhart
ROGER UWYO Roger Taylor, Jr. - Western Wyoming College
JOHNSONK WISCAGE Kirk Johnson
S169126 GBURG Michael Schuler
REBNLYA IUP Kevin Fizz
TPC IUPOAK Thomas P. Cunningham
CEBZ11 GRTHEUN1 Pandelis Theodosiou
GEBZ0703 GRTHEUN1 george kopalidis
OPRGLS GSUVM1 Greg Shoemaker
bj_stedm G2.BRISPOLY.AC.UK Bruce Stedman
CC_S460 TITAN.KING.AC.UK Local Redistribution
KBUBI HUJIVM1 Ilan Ben-Melech
VVMOTI WEIZMANN Holzman Moti
G2YTNGD1 ICINECA Paolo Furlani
GERMANO IVRUNIV Germano Rossi
MCINF05 IGECUNIV taxi soft
S3ADM IMERJ Paulo C. C. Hauer
KINSELLA IRTCCARL Austin Kinsella
sasha KRYPTON.STANFORD.EDU Sasha Lifson
butt SUMEX-AIM.STANFORD.EDU Abee Jan
EWINOGRAD%CCNODE VAXF.COLORADO.EDU "Ed Winograd"
CB#0 LAFAYACS BILL COLLINS
GG30 LAFAYACS GABRIEL T. GAGLIANO
pascal-l LANDOVER.PP.FI Jari Dahlgren
ERVIN MOREKYPR Bob Callahan
BESKO MSUNSCL LISA BESKO
LMARSHA WAYNEST1 Laurie Marshall
SVVAIKUN OWUCOMCN "Ram Samudrala"
raj PIC.UCLA.EDU RAJ CHAUDHURY
EEC01001 UFRJ eduardo paiva
MAB01021 UFRJ andre gares
MAD01009 UFRJ max oliver
AK PLWRTU11 Andrzej KALIS
MEF3031 SAKAAU03 Joan Brown
SCP3006 SAKAAU03 sub Charles Markoni
6600john%ucsbuxa.ucsb.edu%ucsbuxa SBITP John Bernstein
CETEK63 TECHNION shahar steiff
V4039 TEMPLEVM Stan Horwitz
7822034 TWNCTU01 Paul Lin
NCHUS038 TWNMOE10 Tsang-Hae Chyan
R9503151 TWNTUCC1 Supreme Monster
GM06091 UAFSYSB Gerald W. McCollum
ARAVIRE UCHDCI01 roberto aravire
GOULDC UDEM CHARLES GOULD
UNCPJS UNC Peter J. Schledorn
C0361 UNIVSCVM Thomas Jenkins
JURBINA1 USACHVM1 jorge urbina fuentes
LISTVIR USACHVM1 Gonzalo M. Rojas Costa
RECHEVER USACHVM1 ricardo echeverria
INGRAM USMCP6 "Jonathan W. Ingram
SOSDUNN VM.UOGUELPH.CA Les Dunn
CH297298 VMTECMEX Gustavo Alonso Garcia
EMDAVID VMTECMEX David Alarid
EM306492 VMTECMEX LUIS MORIN
EM435685 VMTECMEX Artemio Carranza
EM436025 VMTECMEX Eduardo Flores
AL282247 VMTECSLP J Picazzo
20950709 VUVAXCOM Jim Mc Ree
GSMIL1 WMVM1 greg miller
00125425 YSUB Vincent M. Tkac
EVESNIC YUBGEF51 Robert Nedjeral
/*
// DIST2 MAIL FROM=TPC@IUP I=Y FORW(VIA) HOST(232 232 232 8 153 153 153 241 86 ,
//+ 71 519 519 519 181 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 103 103 521 25 25 25 25 25,
//+  25 25 25 25 25 25 53 53 143 36 36 36 36 36 36 36 36 36 36 36 36 36 213 213,
//+  90 506 506 506 22 104 104 104 13 13 13 13 13 57 57 57 130 130 99 76 76 48 ,
//+ 48 146 146 75 222 10 195 195 195 46 46 7 170 198 198 217 200 200 200 200 51,
//+ 7 192 192 193 502 131 134 134 134 89 126 125 122 32 120 120 120 14 119 199 ,
//+ 199 199 199 199 102 101 56 194 144) PATH(232:2,170 8:93 153:2 241:2,153,222,
//+  86:2,153 71:2 519: 181:2 2: 103:2 521:16,144 25: 53:25 143:25 36: 213:36 9,
//+ 0:2,56,32 22:2 104:2,195 13:2 57:2 130: 99:2 76:16 48: 146:75 75: 222:2,181,
//+  10:16,76 195:2 46:2,51,131 7:36,213 170:2 198:2,51,84 217:2,51,84 200:2,19,
//+ 5 517:36,213 192:2,181 193:2,195 502:48 131:2,51 134:2,142 89:2,13 126:2,18,
//+ 1,120 125:2,51,119 122:2,56,32 32:2,56 120:2,181 14:2,22 119:2,51 199:2,22,,
//+ 102 102:2,22 101:2,51 56:2 194:2,51,84 144:16)
//Via DD "TREARN"
//Data DD *,EOF,Res=Disk
Date:         Fri, 3 May 91 09:40:00 EDT
Reply-To:     Pascal Language Discussion List <PASCAL-L@TREARN>
Sender:       Pascal Language Discussion List <PASCAL-L@TREARN>
From:         "Tom Cunningham, Computer Science Department" <TPC@IUP>
Subject:      Question about Object Initialization
To:

Hi:

     If your are also on Pascal-L@YaleVM, you saw this question yesterday.


     In the Turbo Pascal 6.0 User's Guide, page 102, is the following statement:

"Each individual instance of an object must be initialized by a separate
constructor call.  It is not sufficient to initialize one instance of an object
and then assign that instance to additional instances."

     Why??  How are objects implemented?

     If X and Y are of the same object type and X has been initialized using a
constructor, then why doesn't  Y := X  assign the current values of X to Y,
including the address of the Virtual Methods Table for this object type?

Tom
------------------------------------------------------------------------------
  Martin's Law:  You can't learn anything unless you almost know it already.
------------------------------------------------------------------------------
 Thomas P. Cunningham, Associate Professor     BitNet:    TPC@IUP
 Computer Science Department                   DNS (mx)   TPC@Grove.IUP.Edu
 Indiana University of Pennsylvania            Desk:      412-357-2463
 Indiana, Pennsylvania    15705-1087           Office:    412-357-2524
   >> Jimmy Stewart's hometown <<              FAX:       Upon Request

I2010506%DBSTU1.BITNET@uga.cc.uga.edu ( Christian Boettger) (05/06/91)

I do not have an answer, BUT
the question did get here with the length of 415 lines, that is:
1) everything was included twice
2) the complete mailing (address) list was included
PLEASE CONFIGURE YOUR MAILER IN A WAY TO STOP THIS .......
Chr. Boettger


________________________________________________________________________________
       Christian Boettger                phone:  (+49) (0)531/391-5113
                                         FAX  :  (+49) (0)531/391-5129
mail:  Institut fuer Metallphysik und Nukleare Festkoerperphysik,
       (room -167/-168), Technische Universitaet Braunschweig,
       Mendelssohnstrasse 3, W-3300 Braunschweig, Bundesrepublik Deutschland
                                                  FRG / RFA
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