boost/statechart/detail/node_state.hpp
#ifndef BOOST_STATECHART_DETAIL_NODE_STATE_HPP_INCLUDED
#define BOOST_STATECHART_DETAIL_NODE_STATE_HPP_INCLUDED
//////////////////////////////////////////////////////////////////////////////
// Copyright 2002-2006 Andreas Huber Doenni
// Distributed under the Boost Software License, Version 1.0. (See accompany-
// ing file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//////////////////////////////////////////////////////////////////////////////
#include <boost/statechart/detail/state_base.hpp>
#include <boost/intrusive_ptr.hpp>
#include <boost/assert.hpp> // BOOST_ASSERT
#include <algorithm> // std::find_if
namespace boost
{
namespace statechart
{
namespace detail
{
template< class Allocator, class RttiPolicy >
class node_state_base : public state_base< Allocator, RttiPolicy >
{
typedef state_base< Allocator, RttiPolicy > base_type;
protected:
//////////////////////////////////////////////////////////////////////////
node_state_base( typename RttiPolicy::id_provider_type idProvider ) :
base_type( idProvider )
{
}
~node_state_base() {}
public:
//////////////////////////////////////////////////////////////////////////
// The following declarations should be private.
// They are only public because many compilers lack template friends.
//////////////////////////////////////////////////////////////////////////
typedef base_type state_base_type;
typedef intrusive_ptr< node_state_base > direct_state_base_ptr_type;
virtual void exit_impl(
direct_state_base_ptr_type & pSelf,
typename base_type::node_state_base_ptr_type & pOutermostUnstableState,
bool performFullExit ) = 0;
};
//////////////////////////////////////////////////////////////////////////////
template< class OrthogonalRegionCount, class Allocator, class RttiPolicy >
class node_state : public node_state_base< Allocator, RttiPolicy >
{
typedef node_state_base< Allocator, RttiPolicy > base_type;
protected:
//////////////////////////////////////////////////////////////////////////
node_state( typename RttiPolicy::id_provider_type idProvider ) :
base_type( idProvider )
{
for ( orthogonal_position_type pos = 0;
pos < OrthogonalRegionCount::value; ++pos )
{
pInnerStates[ pos ] = 0;
}
}
~node_state() {}
public:
//////////////////////////////////////////////////////////////////////////
// The following declarations should be private.
// They are only public because many compilers lack template friends.
//////////////////////////////////////////////////////////////////////////
typedef typename base_type::state_base_type state_base_type;
void add_inner_state( orthogonal_position_type position,
state_base_type * pInnerState )
{
BOOST_ASSERT( ( position < OrthogonalRegionCount::value ) &&
( pInnerStates[ position ] == 0 ) );
pInnerStates[ position ] = pInnerState;
}
void remove_inner_state( orthogonal_position_type position )
{
BOOST_ASSERT( position < OrthogonalRegionCount::value );
pInnerStates[ position ] = 0;
}
virtual void remove_from_state_list(
typename state_base_type::state_list_type::iterator & statesEnd,
typename state_base_type::node_state_base_ptr_type &
pOutermostUnstableState,
bool performFullExit )
{
state_base_type ** const pPastEnd =
&pInnerStates[ OrthogonalRegionCount::value ];
// We must not iterate past the last inner state because *this* state
// will no longer exist when the last inner state has been removed
state_base_type ** const pFirstNonNull = std::find_if(
&pInnerStates[ 0 ], pPastEnd, &node_state::is_not_null );
if ( pFirstNonNull == pPastEnd )
{
// The state does not have inner states but is still alive, this must
// be the outermost unstable state then.
BOOST_ASSERT( get_pointer( pOutermostUnstableState ) == this );
typename state_base_type::node_state_base_ptr_type pSelf =
pOutermostUnstableState;
pSelf->exit_impl( pSelf, pOutermostUnstableState, performFullExit );
}
else
{
// Destroy inner states in the reverse order of construction
for ( state_base_type ** pState = pPastEnd; pState != pFirstNonNull; )
{
--pState;
// An inner orthogonal state might have been terminated long before,
// that's why we have to check for 0 pointers
if ( *pState != 0 )
{
( *pState )->remove_from_state_list(
statesEnd, pOutermostUnstableState, performFullExit );
}
}
}
}
typedef typename base_type::direct_state_base_ptr_type
direct_state_base_ptr_type;
private:
//////////////////////////////////////////////////////////////////////////
static bool is_not_null( const state_base_type * pInner )
{
return pInner != 0;
}
state_base_type * pInnerStates[ OrthogonalRegionCount::value ];
};
} // namespace detail
} // namespace statechart
} // namespace boost
#endif