ceph/src/boost/libs/type_erasure/include/boost/type_erasure/derived.hpp

   1 // Boost.TypeErasure library
   2 //
   3 // Copyright 2011 Steven Watanabe
   4 //
   5 // Distributed under the Boost Software License Version 1.0. (See
   6 // accompanying file LICENSE_1_0.txt or copy at
   7 // http://www.boost.org/LICENSE_1_0.txt)
   8 //
   9 // $Id$
  10
  11 #ifndef BOOST_TYPE_ERASURE_DERIVED_HPP_INCLUDED
  12 #define BOOST_TYPE_ERASURE_DERIVED_HPP_INCLUDED
  13
  14 namespace boost {
  15 namespace type_erasure {
  16
  17 /**
  18  * A metafunction which returns the full @ref any type,
  19  * when given any of its base classes.  This is primarily
  20  * intended to be used when implementing @ref concept_interface.
  21  *
  22  * \see rebind_any, as_param
  23  */
  24 template<class T>
  25 struct derived
  26 {
  27 #ifdef BOOST_TYPE_ERASURE_DOXYGEN
  28     typedef detail::unspecified type;
  29 #else
  30     typedef typename T::_boost_type_erasure_derived_type type;
  31 #endif
  32 };
  33
  34 }
  35 }
  36
  37 #endif