Memory accessViolation NOT thrown, when expected

Hi,
I have a program that is an image processor. It takes an image as input, does some number crunching exits normally.
On one image, I noticed that, while I loop over each pixel in the image, I end up in an index that is beyond the image size.
I would expect a "Access Violation" to be thrown here. But that does not happen.
Any idea why ?
I could run this image in a loop with other images or individually, but it never throws an exception. I know how to fix the problem which would be a boundary condition in my program but I thought there would be some kind of a lock on memory that is
beyond the scope of a variable.
thanks,
MulanSting

On 7/22/2014 8:11 AM, MulanSting wrote:
On one image, I noticed that, while I loop over each pixel in the image, I end up in an index that is beyond the image size.
I would expect a "Access Violation" to be thrown here. But that does not happen.
Any idea why ?
C++ doesn't perform strict bounds checking. Accessing an array out of bounds exhibits undefined behavior. "Continues to work but reads random garbage that just happens to be sitting in memory past the end of the array" is one possible manifestation
of undefined behavior; "crashes with access violation" is another.
I thought there would be some kind of a lock on memory that is beyond
the scope of a variable.
What evidence led you to this conclusion?
Igor Tandetnik

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Lyall,
I have seen this before, a long time ago (several years), and I cannot
remember how/if we resolved it.
If this is an impotant issue to you, I suggest that you open a case with
BEA support.
Regards,
Peter.
Got a Question? Ask BEA at http://askbea.bea.com
The views expressed in this posting are solely those of the author, and BEA
Systems, Inc. does not endorse any of these views.
BEA Systems, Inc. is not responsible for the accuracy or completeness of
the
information provided
and assumes no duty to correct, expand upon, delete or update any of the
information contained in this posting.
Lyall Pearce wrote:
The title says it all really.
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..Lyall

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Memory accessViolation NOT thrown, when expected

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