Using the using directive : namespace « Language Basics « C++ Tutorial

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C++ Tutorial » Language Basics » namespace

1.9.14.Using the using directive

#include <iostream>

#include <ostream>

using namespace std;



namespace A {

  int x = 1;

}

namespace B {

  int y = 2;

}

namespace C {

  int z = 3;

  using namespace B;

}

namespace D {

  int z = 4;

  using namespace B;

  int y = 5;       

}



int main()

{

  int x = 60;

  using namespace A;

  using namespace C;

  



  cout << x << '\n';  

  cout << y << '\n';  

  cout << C::y << '\n';    

  cout << D::y << '\n';    



}

1.9.namespace
	1.9.1.	A namespace
	1.9.2.	Use a namespace
	1.9.3.	A nested namespace
	1.9.4.	Reuse namespace
	1.9.5.	Reference variables in namespaces
	1.9.6.	using namespace in program block
	1.9.7.	Reference global variable, variable in the nested namespace
	1.9.8.	Use Namespace to organize functions
	1.9.9.	function in a namespace reference variables in the same namespace
	1.9.10.	using namespace std;
	1.9.11.	Use function defined in a namespace
	1.9.12.	Using unnamed namespaces.
	1.9.13.	Using namespace aliases
	1.9.14.	Using the using directive

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