Re: [Boost-users] Boost Pool - error: segmentation fault

From: Joost Meijles (joostmeijles_at_[hidden])
Date: 2008-03-26 04:28:57

Thanks a lot. The object_pool approach doesn't work; it causes also a segmentation fault.
The option of explicitly allocating the object does work fine. 

Regards,

Joost
----------------------------------------
> Date: Tue, 25 Mar 2008 09:28:16 -0700
> To: boost-users_at_[hidden]
> From: watanabesj_at_[hidden]
> Subject: Re: [Boost-users] Boost Pool - error: segmentation fault
> 
> AMDG
> 
> Joost Meijles wrote:
>> Hi All,
>>
>> I am trying to use the Boost Pool library, more specifically I am trying to use the singleton pool interface.
>> Everything seems to work fine, till the moment I use it to create an object from a class containing a (STL) map, which results in a segmentation fault.
>> Does anyone know why this happens, or how to work around it?
>>
>> What I find also strange is that the constructor and destructor of the class doesn't seem to be called when using the pool. Is this normal behavior?
>>   
> 
> Yes.
> 
> myPool::malloc does not initialize the MyClass.
> You need to do so explicitly.
> 
> #include 
> #include 
> #include 
> 
> using namespace std;
> 
> class MyClass {
> public:
>     int x;
>     vector y;
>     map z;
> };
> 
> int main() {
>    typedef boost::singleton_pool myPool;
> 
>     MyClass * const t = (MyClass *) myPool::malloc();
>     new(t) MyClass;
>     t->x = 1;
>     t->y.push_back(2);
>     t->z.insert(make_pair(3,3));//causes segmentation fault
> 
>     t->~MyClass();
>  
>     myPool::purge_memory();
> }
> 
> 
> In Christ,
> Steven Watanabe
> 
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