| /*-----------------------------------------------------------------------------+ |
| 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 |
| |
| |