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// Copyright 2008 Christophe Henry
// henry UNDERSCORE christophe AT hotmail DOT com
// This is an extended version of the state machine available in the boost::mpl library
// Distributed under the same license as the original.
// Copyright for the original version:
// Copyright 2005 David Abrahams and Aleksey Gurtovoy. 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)
#ifndef BOOST_MSM_GRAMMAR_H
#define BOOST_MSM_GRAMMAR_H
#include <boost/proto/core.hpp>
#include <boost/msm/common.hpp>
namespace boost { namespace msm
{
// base grammar for all of msm's proto-based grammars
struct basic_grammar : proto::_
{};
// Forward-declare an expression wrapper
template<typename Expr>
struct msm_terminal;
struct msm_domain
: proto::domain< proto::generator<msm_terminal>, basic_grammar >
{};
template<typename Expr>
struct msm_terminal
: proto::extends<Expr, msm_terminal<Expr>, msm_domain>
{
typedef
proto::extends<Expr, msm_terminal<Expr>, msm_domain>
base_type;
// Needs a constructor
msm_terminal(Expr const &e = Expr())
: base_type(e)
{}
};
// grammar forbidding address of for terminals
struct terminal_grammar : proto::not_<proto::address_of<proto::_> >
{};
// Forward-declare an expression wrapper
template<typename Expr>
struct euml_terminal;
struct sm_domain
: proto::domain< proto::generator<euml_terminal>, terminal_grammar, boost::msm::msm_domain >
{};
struct state_grammar :
proto::and_<
proto::not_<proto::address_of<proto::_> >,
proto::not_<proto::shift_right<proto::_,proto::_> >,
proto::not_<proto::shift_left<proto::_,proto::_> >,
proto::not_<proto::bitwise_and<proto::_,proto::_> >
>
{};
struct state_domain
: proto::domain< proto::generator<euml_terminal>, boost::msm::state_grammar,boost::msm::sm_domain >
{};
template<typename Expr>
struct euml_terminal
: proto::extends<Expr, euml_terminal<Expr>, boost::msm::sm_domain>
{
typedef
proto::extends<Expr, euml_terminal<Expr>, boost::msm::sm_domain>
base_type;
// Needs a constructor
euml_terminal(Expr const &e = Expr())
: base_type(e)
{}
// Unhide Proto's overloaded assignment operator
using base_type::operator=;
};
} } // boost::msm
#endif //BOOST_MSM_GRAMMAR_H