boost/type_erasure/detail/check_map.hpp
// 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 {
typedef typename normalize_concept<Concept>::basic basic_components;
// 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::mpl::fold<
basic_components,
::boost::mpl::set0<>,
::boost::type_erasure::detail::get_placeholders<
::boost::mpl::_2,
::boost::mpl::_1
>
>::type 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;
};
template<class Concept, class Map>
struct check_map<Concept, ::boost::type_erasure::static_binding<Map> > :
check_map<Concept, Map>
{};
}
}
}
#endif