The Memory Layout of Members with Different Access Specifiers

 
class A
{
private:
  int n;
public:
  int m;
};

class B
{
private:
  int n;
  int m;
};

Theoretically, the memory layout of these two classes may be different because A has different access types for each member. The C++ Standard allows an implementation to store such members in non-adjacent memory addresses. However, in practice, I'm not aware of any compiler that does so. Under all existing compilers, the memory layout of the two classes is identical.