Thread: Is the following a bad practice in coding?

Code:

namespace a
{
     class A
          {.........};
 }
namespace b
{
     class A : public a::A 
         {...};
 }
namespace c
{
     class A : public b::A
         {...};
}
//and so on..for a few more times.

If it is not a good idea, Why isn't it? && suggest a better way to represent network packets in a simulation.