Scoped using-directive within a struct/class declaration? [duplicate]

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Sometimes I do this to achieve almost the same effect:

namespace detail {
    using namespace System;
    using namespace System::Network;
    using namespace System::Network::Win32::Sockets;

    class Foo : public Bar
    {
         void FooBar(Handle handle, Error& error);
    };
}
using detail::Foo;

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