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Nested Namespace in C++ programming language



Nested Namespace in C++ programming language

You can create nested namespaces. One namespace can be a part of another namespace.
For example, we can create namespace X, which will contain namespace Y:

namespace X
{
	void foo()
	{
		cout << "foo from X is called" << endl;
	}
	namespace Y
	{
		void foo()
		{
			cout << "foo from Y is called" << endl;
		}
	}
}

If you want to call function foo() from namespace Y, you will have to specify the full path to foo() function:

X::Y::foo();

Above line of code means that you are calling function foo from namespace Y, which is a part of namespace X.

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