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
38