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- // Boost.TypeErasure library
- //
- // Copyright 2012 Steven Watanabe
- //
- // Distributed under the Boost Software License Version 1.0. (See
- // accompanying file LICENSE_1_0.txt or copy at
- // http://www.boost.org/LICENSE_1_0.txt)
- //
- // $Id$
- #ifndef BOOST_TYPE_ERASURE_DETAIL_CHECK_MAP_HPP_INCLUDED
- #define BOOST_TYPE_ERASURE_DETAIL_CHECK_MAP_HPP_INCLUDED
- #include <boost/mpl/not.hpp>
- #include <boost/mpl/or.hpp>
- #include <boost/mpl/bool.hpp>
- #include <boost/mpl/set.hpp>
- #include <boost/mpl/has_key.hpp>
- #include <boost/mpl/find_if.hpp>
- #include <boost/mpl/fold.hpp>
- #include <boost/mpl/end.hpp>
- #include <boost/type_traits/is_same.hpp>
- #include <boost/type_erasure/detail/get_placeholders.hpp>
- #include <boost/type_erasure/detail/normalize.hpp>
- #include <boost/type_erasure/deduced.hpp>
- #include <boost/type_erasure/static_binding.hpp>
- namespace boost {
- namespace type_erasure {
- namespace detail {
- template<class T>
- struct is_deduced : boost::mpl::false_ {};
- template<class T>
- struct is_deduced< ::boost::type_erasure::deduced<T> > : boost::mpl::true_ {};
- // returns true if Map has a key for every non-deduced placeholder in Concept
- template<class Concept, class Map>
- struct check_map {
- #ifndef BOOST_TYPE_ERASURE_USE_MP11
- typedef typename normalize_concept<Concept>::basic basic_components;
- typedef typename ::boost::mpl::fold<
- basic_components,
- ::boost::mpl::set0<>,
- ::boost::type_erasure::detail::get_placeholders<
- ::boost::mpl::_2,
- ::boost::mpl::_1
- >
- >::type placeholders;
- // Every non-deduced placeholder referenced in this
- // map is indirectly deduced.
- typedef typename ::boost::type_erasure::detail::get_placeholder_normalization_map<
- Concept>::type placeholder_subs;
- typedef typename ::boost::mpl::fold<
- placeholder_subs,
- ::boost::mpl::set0<>,
- ::boost::mpl::insert<
- ::boost::mpl::_1,
- ::boost::mpl::second< ::boost::mpl::_2>
- >
- >::type indirect_deduced_placeholders;
- typedef typename ::boost::is_same<
- typename ::boost::mpl::find_if<
- placeholders,
- ::boost::mpl::not_<
- ::boost::mpl::or_<
- ::boost::type_erasure::detail::is_deduced< ::boost::mpl::_1>,
- ::boost::mpl::has_key<Map, ::boost::mpl::_1>,
- ::boost::mpl::has_key<indirect_deduced_placeholders, ::boost::mpl::_1>
- >
- >
- >::type,
- typename ::boost::mpl::end<placeholders>::type
- >::type type;
- #else
- typedef ::boost::type_erasure::detail::get_all_placeholders<
- ::boost::type_erasure::detail::normalize_concept_t<Concept>
- > placeholders;
- // Every non-deduced placeholder referenced in this
- // map is indirectly deduced.
- typedef typename ::boost::type_erasure::detail::get_placeholder_normalization_map<
- Concept>::type placeholder_subs;
- typedef ::boost::mp11::mp_unique<
- ::boost::mp11::mp_append<
- ::boost::mp11::mp_transform<
- ::boost::mp11::mp_first,
- ::boost::type_erasure::detail::make_mp_list<Map>
- >,
- ::boost::mp11::mp_transform<
- ::boost::mp11::mp_second,
- ::boost::type_erasure::detail::make_mp_list<placeholder_subs>
- >
- >
- > okay_placeholders;
- template<class P>
- using check_placeholder = ::boost::mpl::or_<
- ::boost::type_erasure::detail::is_deduced<P>,
- ::boost::mp11::mp_set_contains<okay_placeholders, P>
- >;
- typedef ::boost::mp11::mp_all_of<placeholders, check_placeholder> type;
- #endif
- };
- template<class Concept, class Map>
- struct check_map<Concept, ::boost::type_erasure::static_binding<Map> > :
- check_map<Concept, Map>
- {};
- }
- }
- }
- #endif
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