#define statements within a namespace

Question

If I have a #define statement within a namespace as such:

namespace MyNamespace
{
  #define SOME_VALUE 0xDEADBABE
}

Am I correct in saying that

Answer 1

I completely agree with the suggestions on the use of constants and the scope being unlimited for #defines.

However, if you do have to use preprocessor #define lines, please cover them up correctly for the expected scope,

namespace MyNamespace
{
  #define SOME_VALUE 0xDEADBABE
  // your code
  #undef SOME_VALUE
}

Why #defines?
I know one case where an embedded platform did not support constants in the code.
There was no way to initialize them...
It always helps to be more readable.