113 lines
2.9 KiB
C++
113 lines
2.9 KiB
C++
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/*-----------------------------------------------------------------------------+
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Copyright (c) 2008-2009: Joachim Faulhaber
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+------------------------------------------------------------------------------+
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Distributed under the Boost Software License, Version 1.0.
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(See accompanying file LICENCE.txt or copy at
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http://www.boost.org/LICENSE_1_0.txt)
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+-----------------------------------------------------------------------------*/
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#ifndef BOOST_ICL_TYPE_TRAITS_ELEMENT_TYPE_OF_HPP_JOFA_100902
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#define BOOST_ICL_TYPE_TRAITS_ELEMENT_TYPE_OF_HPP_JOFA_100902
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#include <boost/mpl/has_xxx.hpp>
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#include <boost/mpl/bool.hpp>
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#include <boost/icl/type_traits/no_type.hpp>
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namespace boost{ namespace icl
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{
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namespace detail
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{
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BOOST_MPL_HAS_XXX_TRAIT_DEF(element_type)
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BOOST_MPL_HAS_XXX_TRAIT_DEF(value_type)
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BOOST_MPL_HAS_XXX_TRAIT_DEF(key_type)
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}
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//--------------------------------------------------------------------------
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template <class Type>
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struct has_element_type
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: mpl::bool_<detail::has_element_type<Type>::value>
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{};
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template <class Type, bool has_element_type>
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struct get_element_type;
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template <class Type>
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struct get_element_type<Type, false>
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{
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typedef no_type type;
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};
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template <class Type>
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struct get_element_type<Type, true>
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{
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typedef typename Type::element_type type;
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};
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template <class Type>
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struct element_type_of
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{
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typedef typename
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get_element_type<Type, has_element_type<Type>::value>::type type;
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};
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//--------------------------------------------------------------------------
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template <class Type>
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struct has_value_type
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: mpl::bool_<detail::has_value_type<Type>::value>
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{};
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template <class Type, bool has_value_type>
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struct get_value_type;
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template <class Type>
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struct get_value_type<Type, false>
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{
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typedef no_type type;
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};
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template <class Type>
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struct get_value_type<Type, true>
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{
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typedef typename Type::value_type type;
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};
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template <class Type>
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struct value_type_of
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{
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typedef typename
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get_value_type<Type, has_value_type<Type>::value>::type type;
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};
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//--------------------------------------------------------------------------
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template <class Type>
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struct has_key_type
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: mpl::bool_<detail::has_key_type<Type>::value>
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{};
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template <class Type, bool has_key_type>
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struct get_key_type;
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template <class Type>
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struct get_key_type<Type, false>
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{
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typedef no_type type;
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};
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template <class Type>
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struct get_key_type<Type, true>
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{
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typedef typename Type::key_type type;
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};
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template <class Type>
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struct key_type_of
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{
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typedef typename
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get_key_type<Type, has_key_type<Type>::value>::type type;
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};
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}} // namespace boost icl
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#endif
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