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There is one exception. It's sometimes handy to "import" names from one namespace to another. For example suppose some C++ compiler doesn't provide the std::tr1::auto_ptr template, which is used in qpid. Boost does provide a compatible `boostboost::auto_ptr` ptr but it's in the boost namespace and qpid expects it in `stdstd::tr1`tr1. No problem, we create our own tr1/memory header file:

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