// Copyright 2008 Christophe Henry
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// henry UNDERSCORE christophe AT hotmail DOT com
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// This is an extended version of the state machine available in the boost::mpl library
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// Distributed under the same license as the original.
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// Copyright for the original version:
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// Copyright 2005 David Abrahams and Aleksey Gurtovoy. Distributed
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// under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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#ifndef BOOST_MSM_FRONT_DETAILS_COMMON_STATES_H
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#define BOOST_MSM_FRONT_DETAILS_COMMON_STATES_H
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#include <boost/mpl/int.hpp>
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#include <boost/mpl/vector.hpp>
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#include <boost/fusion/container/map.hpp>
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#include <boost/fusion/include/at_key.hpp>
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#include <boost/type_traits/add_const.hpp>
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namespace boost { namespace msm { namespace front {namespace detail
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{
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template <class Attributes= ::boost::fusion::map<> >
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struct inherit_attributes
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{
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inherit_attributes():m_attributes(){}
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inherit_attributes(Attributes const& the_attributes):m_attributes(the_attributes){}
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// on the fly attribute creation capability
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typedef Attributes attributes_type;
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template <class Index>
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typename ::boost::fusion::result_of::at_key<attributes_type,
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Index>::type
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get_attribute(Index const&)
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{
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return ::boost::fusion::at_key<Index>(m_attributes);
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}
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template <class Index>
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typename ::boost::add_const<
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typename ::boost::fusion::result_of::at_key<attributes_type,
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Index>::type>::type
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get_attribute(Index const&)const
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{
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return const_cast<
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typename ::boost::add_const<
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typename ::boost::fusion::result_of::at_key< attributes_type,
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Index >::type>::type>
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(::boost::fusion::at_key<Index>(m_attributes));
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}
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private:
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// attributes
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Attributes m_attributes;
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};
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// the interface for all states. Defines entry and exit functions. Overwrite to implement for any state needing it.
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template<class USERBASE,class Attributes= ::boost::fusion::map<> >
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struct state_base : public inherit_attributes<Attributes>, USERBASE
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{
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typedef USERBASE user_state_base;
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typedef Attributes attributes_type;
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// empty implementation for the states not wishing to define an entry condition
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// will not be called polymorphic way
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template <class Event,class FSM>
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void on_entry(Event const& ,FSM&){}
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template <class Event,class FSM>
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void on_exit(Event const&,FSM& ){}
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// default (empty) transition table;
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typedef ::boost::mpl::vector0<> internal_transition_table;
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typedef ::boost::mpl::vector0<> transition_table;
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};
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}}}}
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#endif //BOOST_MSM_FRONT_DETAILS_COMMON_STATES_H
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