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Groups > comp.lang.c++ > #3012
| From | Ruben Safir <ruben@mrbrklyn.com> |
|---|---|
| Newsgroups | comp.lang.c++ |
| Subject | Re: Destructors can copying objects |
| Date | 2011-04-03 03:08 +0000 |
| Organization | PANIX Public Access Internet and UNIX, NYC |
| Message-ID | <in8ob0$ju1$4@reader1.panix.com> (permalink) |
| References | <in76i3$105$2@reader1.panix.com> <in78aa$100$1@tota-refugium.de> |
On Sat, 02 Apr 2011 15:29:26 +0200, Volker Lukas wrote:
> Ruben Safir wrote:
>> I am creating a linked link program which created a segmentation fault
>> and a core at the end of the program. The program is trying to delete
>> an already deleted object, and I can't seem to protect my program from
>> this. I fixed the problem by sending an object to a function by
>> reference rather than by value, but I'm not satisfied with the
>> solution.
> Why is the member "value_" in your Node template a pointer? Maybe you
> forgot to clone this pointer in Nodes copy constructor. This is just a
> guess. You did not post a full compilable example which represents your
> problem, so it is difficult to find the problem. Please post a full
> program.
>
> Also, there is a list template in the C++ Standard Library. Maybe you
> are coding your own list as an exercise, if not you should consider
> whether using std::list is an option.
I think this outlines the bug
/*
* =====================================================================================
*
* Filename: test_del.cpp
*
* Description: Testing DOuble Deletes
*
* Version: 1.0
* Created: 04/02/2011 05:12:24 PM
* Revision: none
* Compiler: gcc
*
* Author: YOUR NAME Ruben Safir,
* Company: NYLXS
*
* =====================================================================================
*/
#ifndef LINKLIST
#define LINKLIST
#include "linklist.h"
#endif /* ----- not LINKLIST ----- */
#include <iostream>
#include <fstream>
#include <climits>
#include <stdlib.h>
/*
* === FUNCTION ======================================================================
* Name: main
* Description:
* =====================================================================================
*/
chainlist::List<int> creating_int_list();
void find_all_examples(chainlist::List<int>, int);
int main ( int argc, char *argv[] )
{
chainlist::List<int> outside = creating_int_list();
outside.display();
find_all_examples(outside, 4);
outside.find_value(4);
std::cout << "****************************************OUTSIDE**************************************************" << std::endl;
chainlist::Node<int> * found = outside.cursor();
std::cout << "Found first value ==> '" << *found->value() << "' at node =='" << outside.cursor() << std::endl;
found = &(outside.find_next_value(4, *found));
while( found ){
std::cout << "Found next value ==> '" << *(found->value()) << "' at node =='" << outside.cursor() << std::endl;
found = &(outside.find_next_value(4, *found));
}
return EXIT_SUCCESS;
} /* ---------- end of function main ---------- */
chainlist::List<int> creating_int_list(){
// chainlist::List<int> set = new chainlist::List<int>;
chainlist::List<int> set;
srand(12345);
int ran;
for(int i = 0; i < 50000; ++i){
ran=rand();
set.insert(ran % 101);
}
return set;
}
void find_all_examples ( chainlist::List<int> glob, int search_value )
{
glob.find_value(search_value);
chainlist::Node<int> * found = glob.cursor();
std::cout << "Found first value ==> '" << *found->value() << "' at node =='" << glob.cursor() << std::endl;
found = &(glob.find_next_value(search_value, *found));
while( found ){
std::cout << "Found next value ==> '" << *(found->value()) << "' at node =='" << glob.cursor() << std::endl;
found = &(glob.find_next_value(search_value, *found));
}
return ;
}
/
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Destructors can copying objects Ruben Safir <ruben@mrbrklyn.com> - 2011-04-02 12:58 +0000
Re: Destructors can copying objects Volker Lukas <vlukas@gmx.de> - 2011-04-02 15:29 +0200
Re: Destructors can copying objects Ruben Safir <ruben@mrbrklyn.com> - 2011-04-03 02:59 +0000
Re: Destructors can copying objects "Balog Pal" <pasa@lib.hu> - 2011-04-03 11:32 +0200
Re: Destructors can copying objects Leigh Johnston <leigh@i42.co.uk> - 2011-04-03 12:29 +0100
Re: Destructors can copying objects Bart van Ingen Schenau <bart@ingen.ddns.info> - 2011-04-04 13:43 +0200
Re: Destructors can copying objects Michael Doubez <michael.doubez@free.fr> - 2011-04-05 01:26 -0700
Re: Destructors can copying objects Joshua Maurice <joshuamaurice@gmail.com> - 2011-04-04 14:03 -0700
Re: Destructors can copying objects Ruben Safir <ruben@mrbrklyn.com> - 2011-04-04 21:10 +0000
Re: Destructors can copying objects Leigh Johnston <leigh@i42.co.uk> - 2011-04-04 22:28 +0100
Re: Destructors can copying objects Ruben Safir <ruben@mrbrklyn.com> - 2011-04-04 21:07 +0000
Re: Destructors can copying objects Leigh Johnston <leigh@i42.co.uk> - 2011-04-04 22:31 +0100
Re: Destructors can copying objects Leigh Johnston <leigh@i42.co.uk> - 2011-04-04 22:43 +0100
Re: Destructors can copying objects Ruben Safir <ruben@mrbrklyn.com> - 2011-04-04 22:38 +0000
Re: Destructors can copying objects Leigh Johnston <leigh@i42.co.uk> - 2011-04-04 23:42 +0100
Re: Destructors can copying objects Ruben Safir <ruben@mrbrklyn.com> - 2011-04-04 22:54 +0000
Re: Destructors can copying objects James Kanze <james.kanze@gmail.com> - 2011-04-03 10:07 -0700
Re: Destructors can copying objects Ruben Safir <ruben@mrbrklyn.com> - 2011-04-04 21:14 +0000
Re: Destructors can copying objects Ruben Safir <ruben@mrbrklyn.com> - 2011-04-04 21:17 +0000
Re: Destructors can copying objects LR <lruss@superlink.net> - 2011-04-05 01:52 -0400
Re: Destructors can copying objects Ruben Safir <ruben@mrbrklyn.com> - 2011-04-03 03:08 +0000
Re: Destructors can copying objects Paavo Helde <myfirstname@osa.pri.ee> - 2011-04-03 02:11 -0500
Re: Destructors can copying objects Volker Lukas <vlukas@gmx.de> - 2011-04-03 12:02 +0200
Re: Destructors can copying objects Peter Remmers <p.remmers@expires-2011-04-30.arcornews.de> - 2011-04-03 12:14 +0200
Re: Destructors can copying objects Roberto Waltman <usenet@rwaltman.com> - 2011-04-03 18:16 -0400
Re: Destructors can copying objects Ruben Safir <ruben@mrbrklyn.com> - 2011-04-15 23:06 +0000
Re: Destructors can copying objects LR <lruss@superlink.net> - 2011-04-15 19:19 -0400
Re: Destructors can copying objects Ruben Safir <ruben@mrbrklyn.com> - 2011-04-15 23:03 +0000
Re: Destructors can copying objects "Alf P. Steinbach /Usenet" <alf.p.steinbach+usenet@gmail.com> - 2011-04-16 01:47 +0200
Re: Destructors can copying objects Peter Remmers <p.remmers@expires-2011-04-30.arcornews.de> - 2011-04-16 13:00 +0200
Re: Destructors can copying objects "Alf P. Steinbach /Usenet" <alf.p.steinbach+usenet@gmail.com> - 2011-04-16 15:57 +0200
Re: Destructors can copying objects LR <lruss@superlink.net> - 2011-04-02 09:51 -0400
Re: Destructors can copying objects Yannick Tremblay <yannick@tremnblay.co.uk> - 2011-04-04 12:56 +0000
Re: Destructors can copying objects Ruben Safir <ruben@mrbrklyn.com> - 2011-04-04 21:05 +0000
Re: Destructors can copying objects Paavo Helde <myfirstname@osa.pri.ee> - 2011-04-04 21:56 -0500
Re: Destructors can copying objects Yannick Tremblay <yannick@tremnblay.co.uk> - 2011-04-05 11:36 +0000
Re: Destructors can copying objects Ruben Safir <ruben@mrbrklyn.com> - 2011-04-05 15:40 +0000
Re: Destructors can copying objects Sana <sanatakos@gmail.com> - 2011-04-05 10:11 -0700
Re: Destructors can copying objects Ruben Safir <ruben@mrbrklyn.com> - 2011-04-05 20:28 +0000
Re: Destructors can copying objects Yannick Tremblay <yannick@tremnblay.co.uk> - 2011-04-06 11:12 +0000
Re: Destructors can copying objects drew@furrfu.invalid (Drew Lawson) - 2011-04-05 13:02 +0000
Re: Destructors can copying objects Ruben Safir <ruben@mrbrklyn.com> - 2011-04-05 15:51 +0000
Re: Destructors can copying objects drew@furrfu.invalid (Drew Lawson) - 2011-04-05 17:47 +0000
Re: Destructors can copying objects Ruben Safir <ruben@mrbrklyn.com> - 2011-04-05 20:25 +0000
Re: Destructors can copying objects drew@furrfu.invalid (Drew Lawson) - 2011-04-05 20:37 +0000
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