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Can namespaces be nested in C++?
Yes the namespace can be nested in C++. We can define one namespace inside another name space as follows −
Syntax
namespace namespace_name1 { // code declarations namespace namespace_name2 { // code declarations } }
You can access members of nested namespace by using resolution operators as follows −
// to access members of namespace_name2 using namespace namespace_name1::namespace_name2; // to access members of namespace:name1 using namespace namespace_name1;
Example
#include <iostream> using namespace std; // first name space namespace first_space { void func() { cout << "Inside first_space" << endl; } // second name space namespace second_space { void func() { cout << "Inside second_space" << endl; } } } using namespace first_space::second_space; int main () { // This calls function from second name space. func(); return 0; }
Output
Inside second_space
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