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