Making namespaces

Creating a namespace:

namespace Foo
{
    //Declares function bar in namespace foo
    void bar() {}
}

To call bar, you have to specify the namespace first, followed by the scope resolution operator :::

Foo::bar();

It is allowed to create one namespace in another, for example:

namespace A
{
    namespace B
    {
        namespace C
        {
            void bar() {}
        }
    }
}

The above code could be simplified to the following:

namespace A::B::C
{
    void bar() {}
}

Found a mistake? Have a question or improvement idea? Let me know.

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