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Aditya Pandit
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 Posted: Wed May 17, 2006 10:21 am Post subject: Where is the memory leak |
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--------Sample code begin------
typedef boost::shared_ptr<SomeClass> SomePtr;
typedef std::vector<SomePtr> vSomePtr;
ClassA {
public:
vSomePtr methodA( ); //returns a vector of shared_ptrs
}
classB::methodB //processes a vector of smart_ptrs
{
.........
vSomePtr vTmp(pClassA->methodA()) ; //boundschecker shows a
memory leak here
//process the vector
vTmp.clear( );
...........
}
--------Sample code end------
Boundschecker shows a memory leak in the above statement
I have tried the following
a)assignment(this was what I was doing initially)
vTmp = pClassA->methodA()
b) swap(then I tried swapping hoping it will clear the returned
vector)
vSomePtr vTmp;
vTmp.clear( );
vTmp.swap(pClassA->methodA( ) );
---------
but it shows a memory leak in both the above cases.
Let me know if there is a safer way to copy/assign a vector of smart
pointers being returned by a method. I am not able to figure out what
is causing that leak.
Thanks,
Adi
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Ulrich Eckhardt
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| Posted: Wed May 17, 2006 3:21 pm Post subject: Re: Where is the memory leak |
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Aditya Pandit wrote:
| Quote: | typedef boost::shared_ptr<SomeClass> SomePtr;
typedef std::vector<SomePtr> vSomePtr;
ClassA {
public:
vSomePtr methodA( ); //returns a vector of shared_ptrs
}
classB::methodB //processes a vector of smart_ptrs
{
.........
vSomePtr vTmp(pClassA->methodA()) ; //boundschecker shows a
memory leak here
//process the vector
vTmp.clear( );
...........
}
|
There is no memleak in above code, provided you did not hit a bug in
either
Boost, your standardlibrary or your compiler.
| Quote: | Boundschecker shows a memory leak in the above statement
|
What exactly does it claim is leaking? Parts of the vector, parts of the
contained shared_ptrs or parts of what they point to? Also, what
version of
Boost are we talking about and what compiler/stdlib are you using?
Uli
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Allan W
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| Posted: Wed May 17, 2006 10:21 pm Post subject: Re: Where is the memory leak |
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Ulrich Eckhardt wrote:
| Quote: | There is no memleak in above code, provided you did not hit a bug in
either
Boost, your standardlibrary or your compiler.
|
Or conceivably in Bounds Checker.
Try putting the "memory leak" statement in a loop, execute it 100
times.
Do you have 100 times as much memory loss?
If not, then something else is really going on.
[ See http://www.gotw.ca/resources/clcm.htm for info about ]
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