/usr/include/dune/common/documentation.hh is in libdune-common-dev 2.2.1-2.
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#ifndef DUNE_COMMON_DOCUMENTATION_HH
#define DUNE_COMMON_DOCUMENTATION_HH
/** \file
    \brief Documentation related stuff
*/
namespace Dune {
  //! Dummy struct used for documentation purposes
  /**
   * This struct can be used for documenting interfaces.  One example would
   * be:
   * \code
// Traits class that determines some property for some other type T
template<class T>
class SomeTraits {
  dune_static_assert(AlwaysFalse<T>::value,
                     "Sorry, SomeTraits must be specialized for all types");
public:
  // The type of some property of T
  typedef ImplementationDefined type;
};
#ifndef DOXYGEN
template<>
struct SomeTraits<int>
  typedef ... type;
};
// ...
#endif // DOXYGEN
   * \endcode
   *
   * \sa implementationDefined
   */
  struct ImplementationDefined {};
  //! Dummy integral value used for documentation purposes
  /**
   * \var Dune::implementationDefined
   * \code
#include <dune/common/documentation.hh>
   * \endcode
   *
   * \sa ImplementationDefined
   */
  enum { implementationDefined };
}
#endif // DUNE_COMMON_DOCUMENTATION_HH
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