c++ namespace best practice dilemma

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Here’s what I do.

In <mylibrary.h>:

namespace myproject {
  namespace mylibrary
  {
    namespace impl
    {
      using namespace otherlibrary;
      using namespace boost;
      using namespace std;
      using namespace whatever::floats::your::boat;

      class myclass;
      class myotherclass;
    };
    using impl::myclass;
    using impl::myotherclass;
  };
};

In the source:

#include <mylibrary.h>
using namespace myproject::mylibrary; //clean!

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