ceph/src/boost/boost/mpl/aux_/type_wrapper.hpp

   1
   2 #ifndef BOOST_MPL_AUX_TYPE_WRAPPER_HPP_INCLUDED
   3 #define BOOST_MPL_AUX_TYPE_WRAPPER_HPP_INCLUDED
   4
   5 // Copyright Aleksey Gurtovoy 2000-2004
   6 // Copyright Peter Dimov 2000-2003
   7 //
   8 // Distributed under the Boost Software License, Version 1.0.
   9 // (See accompanying file LICENSE_1_0.txt or copy at
  10 // http://www.boost.org/LICENSE_1_0.txt)
  11 //
  12 // See http://www.boost.org/libs/mpl for documentation.
  13
  14 // $Id$
  15 // $Date$
  16 // $Revision$
  17
  18 #include <boost/mpl/aux_/config/ctps.hpp>
  19
  20 namespace boost { namespace mpl { namespace aux {
  21
  22 template< typename T > struct type_wrapper
  23 {
  24     typedef T type;
  25 };
  26
  27 #if !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION)
  28 // agurt 08/may/03: a complicated way to extract the wrapped type; need it
  29 // mostly for the sake of GCC (3.2.x), which ICEs if you try to extract the
  30 // nested 'type' from 'type_wrapper<T>' when the latter was the result of a
  31 // 'typeof' expression
  32 template< typename T > struct wrapped_type;
  33
  34 template< typename T > struct wrapped_type< type_wrapper<T> >
  35 {
  36     typedef T type;
  37 };
  38 #else
  39 template< typename W > struct wrapped_type
  40 {
  41     typedef typename W::type type;
  42 };
  43 #endif
  44
  45 }}}
  46
  47 #endif // BOOST_MPL_AUX_TYPE_WRAPPER_HPP_INCLUDED