/*-----------------------------------------------------------------------------+ | |
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_ELEMENT_TYPE_OF_HPP_JOFA_100902 | |
#define BOOST_ICL_TYPE_TRAITS_ELEMENT_TYPE_OF_HPP_JOFA_100902 | |
#include <boost/mpl/has_xxx.hpp> | |
#include <boost/mpl/bool.hpp> | |
#include <boost/icl/type_traits/no_type.hpp> | |
namespace boost{ namespace icl | |
{ | |
namespace detail | |
{ | |
BOOST_MPL_HAS_XXX_TRAIT_DEF(element_type) | |
BOOST_MPL_HAS_XXX_TRAIT_DEF(value_type) | |
BOOST_MPL_HAS_XXX_TRAIT_DEF(key_type) | |
} | |
//-------------------------------------------------------------------------- | |
template <class Type> | |
struct has_element_type | |
: mpl::bool_<detail::has_element_type<Type>::value> | |
{}; | |
template <class Type, bool has_element_type> | |
struct get_element_type; | |
template <class Type> | |
struct get_element_type<Type, false> | |
{ | |
typedef no_type type; | |
}; | |
template <class Type> | |
struct get_element_type<Type, true> | |
{ | |
typedef typename Type::element_type type; | |
}; | |
template <class Type> | |
struct element_type_of | |
{ | |
typedef typename | |
get_element_type<Type, has_element_type<Type>::value>::type type; | |
}; | |
//-------------------------------------------------------------------------- | |
template <class Type> | |
struct has_value_type | |
: mpl::bool_<detail::has_value_type<Type>::value> | |
{}; | |
template <class Type, bool has_value_type> | |
struct get_value_type; | |
template <class Type> | |
struct get_value_type<Type, false> | |
{ | |
typedef no_type type; | |
}; | |
template <class Type> | |
struct get_value_type<Type, true> | |
{ | |
typedef typename Type::value_type type; | |
}; | |
template <class Type> | |
struct value_type_of | |
{ | |
typedef typename | |
get_value_type<Type, has_value_type<Type>::value>::type type; | |
}; | |
//-------------------------------------------------------------------------- | |
template <class Type> | |
struct has_key_type | |
: mpl::bool_<detail::has_key_type<Type>::value> | |
{}; | |
template <class Type, bool has_key_type> | |
struct get_key_type; | |
template <class Type> | |
struct get_key_type<Type, false> | |
{ | |
typedef no_type type; | |
}; | |
template <class Type> | |
struct get_key_type<Type, true> | |
{ | |
typedef typename Type::key_type type; | |
}; | |
template <class Type> | |
struct key_type_of | |
{ | |
typedef typename | |
get_key_type<Type, has_key_type<Type>::value>::type type; | |
}; | |
}} // namespace boost icl | |
#endif | |