Segmentation Fault On Program Termination?

[Goran]

Hi all,

i have a problem on program termination.

At the moment when main() ends my program creates a segmentation
fault.
#include <libmylib/myObject.h>

int main() {

using namespace Mylib;

MyObject1_t * aObject1 = 0;
MyObject2_t aObject2("someS tring");

aObject1 = new Object1_t(aObje ct2);

delete aObject1; // program still works

// cout or other still works here

return(0); // program creates an seg. fault

}

I know it's maybe tricky to say something to my problem due to missed
postings of Object1_t and Object2_t but I hope this is some beginner-
failure :)

Goran

[=?ISO-8859-1?Q?Erik_Wikstr=F6m?=]

On 2007-08-28 03:26, Goran wrote:

Hi all,

i have a problem on program termination.

At the moment when main() ends my program creates a segmentation
fault.
#include <libmylib/myObject.h>

int main() {

using namespace Mylib;

MyObject1_t * aObject1 = 0;
MyObject2_t aObject2("someS tring");

aObject1 = new Object1_t(aObje ct2);

delete aObject1; // program still works

// cout or other still works here

return(0); // program creates an seg. fault

}

I know it's maybe tricky to say something to my problem due to missed
postings of Object1_t and Object2_t but I hope this is some beginner-
failure :)

Can't say anything for sure until you show us the code for MyObject1_t
and MyObject2_t.

My guess would be that they both contains a std::string* (or worse
char*) and that the text used in the constructor for aObject2 is stored
in that. When you create aObject1 with the copy constructor you somehow
fail to properly copy the string and when you later delete aObject1 it
too is deleted. For some reason you then try to dereference the pointer
in the destructor which is why the program crashes.

--
Erik Wikström

[werasm]

Goran wrote:

Hi all,

i have a problem on program termination.

At the moment when main() ends my program creates a segmentation
fault.
#include <libmylib/myObject.h>

int main() {

using namespace Mylib;

MyObject1_t * aObject1 = 0;
MyObject2_t aObject2("someS tring");

aObject1 = new Object1_t(aObje ct2);

delete aObject1; // program still works

// cout or other still works here

return(0); // program creates an seg. fault

}

I know it's maybe tricky to say something to my problem due to missed
postings of Object1_t and Object2_t but I hope this is some beginner-
failure :)

My guess would be that something in aObject2 gets deleted when you
call
delete aObject1 due to the fact that MyObject1_t stole a pointer from
MyObject2_t during the assignment. When the destructor of MyObject1_t
was called, it deleted its member, whilst the member was never truly
owned.

Read up on "Deep Copying", and "Copy Constructors" in the FAQs.

Regards,

Werner

[Joe Greer]

Goran <po**********@g mail.comwrote in news:1188264416 .738284.208330
@y42g2000hsy.go oglegroups.com:

Hi all,

i have a problem on program termination.

At the moment when main() ends my program creates a segmentation
fault.
#include <libmylib/myObject.h>

int main() {

using namespace Mylib;

MyObject1_t * aObject1 = 0;
MyObject2_t aObject2("someS tring");

aObject1 = new Object1_t(aObje ct2);

delete aObject1; // program still works

// cout or other still works here

return(0); // program creates an seg. fault

}

See Victor's posting about crystal balls etc, but if I had to guess...

aObject2 is the only variable on the stack and I would guess that it's
destruction at the return is what's causing the fault. Since you pass
in a literal text string, I further guess that aObject2 has grabbed that
pointer and you are trying to delete it when aObject2 is destroyed.

Can't say much more than that with out actual code.

joe

[Goran]

On Aug 28, 1:48 pm, Joe Greer <jgr...@doublet ake.comwrote:

Goran <postmasch...@g mail.comwrote in news:1188264416 .738284.208330
@y42g2000hsy.go oglegroups.com:

Hi all,

i have a problem on program termination.

At the moment when main() ends my program creates a segmentation
fault.

#include <libmylib/myObject.h>

int main() {

using namespace Mylib;

MyObject1_t * aObject1 = 0;
MyObject2_t aObject2("someS tring");

aObject1 = new Object1_t(aObje ct2);

delete aObject1; // program still works

// cout or other still works here

return(0); // program creates an seg. fault

}

See Victor's posting about crystal balls etc, but if I had to guess...

aObject2 is the only variable on the stack and I would guess that it's
destruction at the return is what's causing the fault. Since you pass
in a literal text string, I further guess that aObject2 has grabbed that
pointer and you are trying to delete it when aObject2 is destroyed.

Can't say much more than that with out actual code.

joe

Thanks to all! I've found the prob. My object used pointers for member
var. and I had NO copy constructor... Still learning :)

Goran