Answer / santosh mundhe

Another advantage is that u can extend namespace within the
same file ....

E.g
#include <iostream>

using namespace std;

namespace
{
int myval;
void funct (int);
}

namespace
{
void funct (int i)
{
cout << i << endl;
}
}

int main()
{
funct(myval);
return 0;
}

Answer / c++ coder

in addition to the advantage mentioned above , there is one
more that the namespace is local to the file and one cannot
use it into another by 'using namespace' since it is
unnamed.

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