[SOLVED] Is it acceptable to add a "using namespace" immediately after the namespace declaration?

Is it acceptable to add a "using namespace" immediately after the namespace declaration?

I have a small namespace containing some type definitions, which I use to make my code look cleaner. However I don't want to have to add a "using namespace ..." line to every file that uses one of these types, after all I already have to add a #include for the file.

MyFile.cpp:

#include "typedefs.h"
void Bob()
{
    IntList^ list = gcnew IntList;
}

typedefs.h:

namespace Typedefs
{
    typedef List<int> IntList;
    typedef array<int> IntArray;
    typedef List<Byte> ByteList;
    typedef array<Byte> ByteArray;
    typedef List<String^> StringList;
    typedef array<String^> StringArray;
}
using namespace Typedefs;

Would it be acceptable to add the "using namespace" line immediately after the namespace declaration? If not, why not?

Solution

Use an unnamed namespace. If you want to have the names visible only to the files in which you have included the headers

namespace {
  int i = 10;
}

above has the same effect as like below code

namespace randomName {
  int i = 10;
}
using randomName;

so nothing will be accessible from any other file.