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Editing: element_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_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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