STL Vector : Program crashes just after inclusion of a vector member variable.

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Hi,

I have declared a vector as a member variable in a class in my program. I am not even using it but still it gives access violation error at runtime.

Why is it so ??

vector <int> m_iNumbers;

Posted 5-Jul-11 23:05pm

PrafullaVedante

Updated 5-Jul-11 23:08pm

Tarun.K.S

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ThatsAlok 6-Jul-11 5:22am

i doubt it...could you let us know what the actual error!

PrafullaVedante 6-Jul-11 6:06am

Error comes at runtime .... Program shows error about memory corruption at the exit.

Sergey Alexandrovich Kryukov 6-Jul-11 11:14am

There is nothing wrong in the code line you show. The problem is elsewhere. You do not provide sufficient information.
--SA

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Roger Allen · Answer 1 · 2011-07-06T02:23:00

Solution 4

The other cause could be that a memory overwrite exists in the previously existing code. It now overwrites the new member variable and thus corrupts it.

You can check for this by adding a buffer before the new variable, init to 0 in the constructor and check the content at various points to see if/when its being corrupted.

Posted 6-Jul-11 2:23am

Roger Allen

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CPallini 6-Jul-11 9:02am

Good point, indeed.

Niklas L 6-Jul-11 15:22pm

You can even set a break point in VS to trigger when that variable changes, to quickly find the offending module. 5.

వేంకటనారాయణ(venkatmakam) · Answer 2 · 2011-07-05T23:16:00

Solution 1

I think just inclusion wont give any error.If you are using Microsoft visual studio, Just start debugger and when the error came click on retry button which takes you to the error code and check from where the error is coming.

Posted 5-Jul-11 23:16pm

వేంకటనారాయణ(venkatmakam)

Richard MacCutchan · Answer 3 · 2011-07-06T00:58:00

Solution 2

I just added that line to my program and it has no effect, you must be doing something else to cause the crash.

Posted 6-Jul-11 0:58am

Richard MacCutchan

Comments

Niklas L 6-Jul-11 7:16am

Did you actually add it to your own code to verify that? Something tells me you're not being completely honest here :)

Richard MacCutchan 6-Jul-11 7:29am

Yes, I did add it to my own code. I do not see why you need to imply that I'm being dishonest!

Niklas L 6-Jul-11 9:39am

Simply because your're an excellent C++ programmer. I imply that you knew before testing it that the inclusion of the member variable wasn't the real problem, and that you also knew your own code would work with or without it. If you could not add a vector<int> without having your code break, not much code would work.
It was meant as a compliment rather than an accusation, even if it was somewhat disguised.

Richard MacCutchan 6-Jul-11 10:49am

My mistake; I guess I misinterpreted your message, and also did not quite notice the smiley.
Oh, BTW, I am far from being an excellent C++ programmer; but I am willing to learn.

Emilio Garavaglia · Answer 4 · 2011-07-06T01:21:00

The line itself does almost nothing but making your class a little wider.
If you are working with multiple files, check the inclusion dependencies (it seems you class is destroyed in a file whose obj file doesn't know about the change you made: probably a full rebuild will eliminated the problem).

Or... you used the vector using the [] operator (that doesn't check form bounds ...) outside a proper range (causing corruption in a memory guard, that is revealed during the system cleanup)

Or ... many other (bad) things

STL Vector : Program crashes just after inclusion of a vector member variable.

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STL Vector : Program crashes just after inclusion of a vector member variable.

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