CODEWITHSUNDEEP
c++headernamespaces
Andreas Loanjoe
Andreas Loanjoe

Reputation: 2399

C++ using namespaces into same namespace nested

Let's say I have a namespace:

namespace UI
{
}

And I have another namespace:

namespace Domain
{
}

Now let's say in the Domain namespace I also have a UI namespace that is specific for that domain.

namespace Domain
{
    namespace UI
    {
    }
}

Is it possible to import the global UI namespace into the domain UI namespace without importing it in the Domain namespace? I know using namespace is often not a good idea but conceptually the domain UI namespace should be both in the global UI namespace and in the domain namespace.

Upvotes: 1

Views: 81

Answers (1)

Enoc Martinez
Enoc Martinez

Reputation: 165

The only possible ways are namespace alias or use the entire namespace UI into Domain::UI. In both cases theres a way for access it from Domain namespace.

Examples:

namespace UI {
    class Test {

    };
}

namespace Domain {

}

namespace Domain {
    namespace UI {
        namespace _UI = ::UI;

        struct Test2 {
            _UI::Test param;
        };
    }
}

namespace Domain2 {

    namespace UI {
        using namespace ::UI;

        struct Test2 {
            Test param;
        };
    }
}

Upvotes: 2

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