Using namespace aliases : namespace « Language Basics « C++ Tutorial

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C++ Tutorial » Language Basics » namespace

1.9.13.Using namespace aliases

#include <iostream>

#include <ostream>

namespace original {

  int f();

}



namespace ns = original;     



int ns::f() { return 42; }   

using ns::f;                 



int g() { return f(); }



int main()

{

  std::cout << ns::f() << '\n';

  std::cout << original::f() << '\n';

  std::cout << g() << '\n';

}

42
42
42

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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