Vector of shared pointers , memory problems after clearing the vector

Question

I realized that after calling vector.clear() which hold shared pointers, the destructors of the object which own by shared_ptr is not being released. <

Answer 1

The reason the destructor isn't called until later is that your variable sharedptr is still in scope until the end of your main(). There are a few ways around this if you really want it cleaned up before then. The most obvious way to fix this is to only use sharedptr in a quick block scope:

int main( )
{
    std::vector > test;
    {
      shared_ptr sharedptr (new A);
      test.push_back(sharedptr);
    }
    test.clear();
    cout << "I am here" << endl;
}

Or alternatively, never create the sharedptr variable at all:

int main( )
{
    std::vector > test;
    test.push_back( shared_ptr(new A) );
    test.clear();
    cout << "I am here" << endl;
}