Boost库之共享内存报了异常，怎么解决？

#include <boost/interprocess/managed_shared_memory.hpp>
#include <boost/interprocess/allocators/allocator.hpp>
#include <boost/interprocess/containers/vector.hpp>
#include <boost/interprocess/sync/named_mutex.hpp>
#include <iostream>
#define  SHM_SIZE 2*1024*1024
typedef boost::interprocess::allocator<int,boost::interprocess::managed_shared_memory::segment_manager> ShmemAllocator;
typedef boost::interprocess::vector<int,ShmemAllocator> MyVector;
class CShm
{
public:
    CShm();
    ~CShm();
    void Task(void);
private:
    boost::interprocess::named_mutex mutex;
    MyVector *pObj;
};
CShm::CShm():mutex(boost::interprocess::open_or_create,"shm_mtx")
{
    try
    {
        boost::interprocess::managed_shared_memory segment(boost::interprocess::open_or_create,"SHM",SHM_SIZE);
        const ShmemAllocator alloc_inst(segment.get_segment_manager());
        MyVector *pObj = segment.construct<MyVector>("MyVector")(alloc_inst);
    }
    catch (boost::interprocess::interprocess_exception& ex)
    {
        std::cout<<ex.what()<<std::endl;
    }
}
CShm::~CShm()
{
    mutex.remove("shm_mtx");
    boost::interprocess::shared_memory_object::remove("SHM");
}
void CShm::Task(void)
{
    for (int i = 0;i < 10; i++)
    {
        mutex.lock();
        pObj->push_back(i+1);
        mutex.unlock();
    }
    mutex.lock();
    for (MyVector::const_iterator it = pObj->begin(); it != pObj->end(); it++)
        std::cout<<*it<<" ";
    mutex.unlock();
}
int main()
{
    CShm _gShm;
    _gShm.Task();
    return 0;
}