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Help to resolve this error message caused in using Vector.push_back.

Posted on 2006-06-09
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Last Modified: 2010-04-01
Dear expert,

I have the code:
std::vector<int> rank;

rank.push_back(0) is called is a loop, rank.push_back(0) works fine first 9 calls but has following error when it is called at 10th call.

Error message from BoundsChecker:
Dynamic memory overrun
32 byte block allocated in c:\program files\microsoft visual studio\vc98\include\xmemory (30)
HANDLE: 0x02DE16A0
allocating thread ID: 0x9CC, current thread ID: 0x9CC

Please help! Thanks.

Hanqian
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Question by:Hanqian
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LVL 86

Accepted Solution

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jkr earned 500 total points
ID: 16871022
try

rank.reserve(16);

If you then get the message at the 16th or 17th call, you can be sure that it is safe to ignore it, since it would mean that BoundsChecker takes vector resizing as an error (which it isn't).
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Author Comment

by:Hanqian
ID: 16871168
I put rank.reserve(16) at begining of my loop, I don't see error message any more. Does it mean my error is fixed?

Xia
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LVL 86

Expert Comment

by:jkr
ID: 16871360
I doubt that there ever was a real error, but if the message is gone, I'd say yes. You can verify the default capacity for vectors in your STL implementation using e.g.

cout << rank.capacity() << endl;

*before* calling 'reserve()' - I assume the output will be '10'.
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Author Comment

by:Hanqian
ID: 16871515
Print cout << rank.capacity() << endl;
 for each call without adding rank.resever() , these are numbers returned:
1th call: 0
2th call: 1
3th call: 2
     :       4
     :       4
     :      8
            8
            8
            8
           16

Anything wrong?

Hanqian
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LVL 8

Expert Comment

by:List244
ID: 16871701
*Please do not accept this for points*

Those numbers for capacity look good.
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LVL 86

Expert Comment

by:jkr
ID: 16871745
Nope, looks good to me also.
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