boost/icl/type_traits/rep_type_of.hpp
/*-----------------------------------------------------------------------------+
Copyright (c) 2008-2009: Joachim Faulhaber
+------------------------------------------------------------------------------+
Distributed under the Boost Software License, Version 1.0.
(See accompanying file LICENCE.txt or copy at
http://www.boost.org/LICENSE_1_0.txt)
+-----------------------------------------------------------------------------*/
#ifndef BOOST_ICL_TYPE_TRAITS_REP_TYPE_OF_HPP_JOFA_110329
#define BOOST_ICL_TYPE_TRAITS_REP_TYPE_OF_HPP_JOFA_110329
#include <boost/config.hpp> // For macro BOOST_STATIC_CONSTANT
#include <boost/mpl/has_xxx.hpp>
#include <boost/mpl/or.hpp>
#include <boost/mpl/and.hpp>
#include <boost/mpl/not.hpp>
#include <boost/type_traits/is_same.hpp>
#include <boost/icl/type_traits/no_type.hpp>
namespace boost{ namespace icl
{
namespace detail
{
BOOST_MPL_HAS_XXX_TRAIT_DEF(rep)
}
//--------------------------------------------------------------------------
template <class Type>
struct has_rep_type
: mpl::bool_<detail::has_rep<Type>::value>
{};
template <class Rep, class Type>
struct represents // Rep represents Type; Type is_wrapper_of Rep
: mpl::bool_<detail::has_rep<Type>::value>
{
typedef represents type;
BOOST_STATIC_CONSTANT(bool,
value = (mpl::and_< has_rep_type<Type>
, boost::is_same<typename Type::rep, Rep> >::value)
);
};
//--------------------------------------------------------------------------
template <class Type, bool has_rep>
struct get_rep_type;
template <class Type>
struct get_rep_type<Type, false>
{
typedef no_type type;
};
template <class Type>
struct get_rep_type<Type, true>
{
typedef typename Type::rep type;
};
//--------------------------------------------------------------------------
template<class Type>
struct rep_type_of
{
typedef typename
get_rep_type<Type, has_rep_type<Type>::value>::type type;
};
}} // namespace boost icl
#endif