CxxUtils::Impl Node1 CxxUtils::Impl - m_nbits - m_nblocks + operator new() + operator delete() + Impl() + Impl() + operator=() + assign() + nbits() + test() + count() + none() and 17 more... Node2 std::atomic< size_t > + ptr   Node2->Node1 -m_hwm Node3 std::atomic< Block_t > + ptr   Node3->Node1 -m_data Node4 std::vector< value _type > + elements + elements   Node4->Node1 -m_data