Hi Igor, I'm using "new" to allocate the object. My code looks like, In hpp file, typedef Std::map<Std::string, int> MyMap; class MyClass { ........... private boost::shared_ptr< MyMap > m_myMap; } In cpp file MyClass::MyClass() { m_ myMap.reset(new MyMap); } MyClass::~MyClass() { m_ myMap.reset(); } Best regards, Hua