boost/icl/type_traits/size_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_SIZE_TYPE_OF_HPP_JOFA_080911
#define BOOST_ICL_TYPE_TRAITS_SIZE_TYPE_OF_HPP_JOFA_080911
#include <boost/mpl/has_xxx.hpp>
#include <boost/icl/type_traits/difference_type_of.hpp>
namespace boost{ namespace icl
{
namespace detail
{
BOOST_MPL_HAS_XXX_TRAIT_DEF(size_type)
}
//--------------------------------------------------------------------------
template <class Type>
struct has_size_type
: mpl::bool_<detail::has_size_type<Type>::value>
{};
//--------------------------------------------------------------------------
template <class Type, bool has_size, bool has_diff, bool has_rep>
struct get_size_type;
template <class Type>
struct get_size_type<Type, false, false, false>
{
typedef std::size_t type;
};
template <class Type, bool has_diff, bool has_rep>
struct get_size_type<Type, true, has_diff, has_rep>
{
typedef typename Type::size_type type;
};
template <class Type, bool has_rep>
struct get_size_type<Type, false, true, has_rep>
{
typedef typename Type::difference_type type;
};
template <class Type>
struct get_size_type<Type, false, false, true>
{
typedef Type type;
};
//--------------------------------------------------------------------------
template<class Type>
struct size_type_of
{
typedef typename
get_size_type< Type
, has_size_type<Type>::value
, has_difference_type<Type>::value
, has_rep_type<Type>::value
>::type type;
};
}} // namespace boost icl
#endif