| Topic: |
DEVELOP > c-Plus-Plus |
| User: |
"Parapura Rajkumar" |
| Date: |
03 Jan 2007 10:33:34 PM |
| Object: |
iterator pointing to invalid container |
int main(int argc, char* argv[])
{
std::map<int, int>::iterator footest;
{
std::map<int, int> foo;
foo[0] = 0;
footest = foo.begin();
}
return 0;
}
Is this undefined behavior? Please note that footest is going out of
scope before std::map. In theory an implementation could have a
iterator destructor that could still access the std::map ?
Thanks
Raj
.
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| User: "Victor Bazarov" |
|
| Title: Re: iterator pointing to invalid container |
03 Jan 2007 11:47:13 PM |
|
|
Parapura Rajkumar wrote:
int main(int argc, char* argv[])
{
std::map<int, int>::iterator footest;
{
std::map<int, int> foo;
foo[0] = 0;
footest = foo.begin();
}
return 0;
}
Is this undefined behavior? Please note that footest is going out of
scope before std::map.
You mean, "after 'foo'", don't you?
In theory an implementation could have a
iterator destructor that could still access the std::map ?
No. The iterator is allowed to be invalid, that does not affect
its destruction.
V
--
Please remove capital 'A's when replying by e-mail
I do not respond to top-posted replies, please don't ask
.
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|
| User: "Roland Pibinger" |
|
| Title: Re: iterator pointing to invalid container |
04 Jan 2007 07:11:15 AM |
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|
On Thu, 4 Jan 2007 00:47:13 -0500, "Victor Bazarov" wrote:
Parapura Rajkumar wrote:
int main(int argc, char* argv[])
{
std::map<int, int>::iterator footest;
{
std::map<int, int> foo;
foo[0] = 0;
footest = foo.begin();
}
return 0;
}
Is this undefined behavior? Please note that footest is going out of
scope before std::map.
You mean, "after 'foo'", don't you?
In theory an implementation could have a
iterator destructor that could still access the std::map ?
No. The iterator is allowed to be invalid, that does not affect
its destruction.
Different kinds of invalid iterators are described here:
http://www.angelikalanger.com/Conferences/Slides/CppInvalidIterators-DevConnections-2002.pdf
Best wishes,
Roland Pibinger
.
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