c++ - Is holding a reference to another object as a member safe in this case? -

i have few classes, each depends on using instance of object in dependency chain. looks this:

class {} ;  class b  {      a& m_a;  public:     b(a& a) : m_a(a) { }  };  class c {     b& m_b; public:     c(b& b) : m_b(b) { } };

to protect myself holding dangling references because of order of destruction, i'm holding of these in container class, this:

struct data {     data() : m_b(m_a), m_c(m_b) { }      m_a;     b m_b;     c m_c; };

assuming order of members in class data matches dependency order, safe so? there pitfalls in holding these references i'm missing?

it's ok. class-members initialized in order, in declared, so:

m_a initialized -> m_b initialized reference m_a -> m_c initialized reference m_b.

O9