Namespaces are additive

 


#include <iostream>
using namespace std;

namespace Demo {            // In Demo namespace
  int a; 
}

int x;                      // this is in global namespace

namespace Demo {
  int b;                    // this is in of Demo namespace, too
}

int main()
{
  using namespace Demo;

  a = b = x = 100;

  cout << a << " " << b << " " << x;

  return 0;
}

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Namespaces are additive : NameSpace « Language « C++

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