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//////////////////////////////////////////////////////////////////////////////
// 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)
//////////////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////////////
// The following example program demonstrates the use of orthogonal states and
// state_downcast to query the state of orthogonal regions.
// Moreover, the use of the state type information interface is also shown.
//////////////////////////////////////////////////////////////////////////////
// #define BOOST_STATECHART_USE_NATIVE_RTTI
#include <boost/statechart/event.hpp>
#include <boost/statechart/state_machine.hpp>
#include <boost/statechart/simple_state.hpp>
#include <boost/statechart/transition.hpp>
#include <boost/statechart/custom_reaction.hpp>
#include <boost/mpl/list.hpp>
#include <boost/config.hpp>
#include <iostream>
#include <iomanip>
#ifdef BOOST_INTEL
# pragma warning( disable: 304 ) // access control not specified
# pragma warning( disable: 981 ) // operands are evaluated in unspecified order
#endif
namespace sc = boost::statechart;
namespace mpl = boost::mpl;
//////////////////////////////////////////////////////////////////////////////
struct EvNumLockPressed : sc::event< EvNumLockPressed > {};
struct EvCapsLockPressed : sc::event< EvCapsLockPressed > {};
struct EvScrollLockPressed : sc::event< EvScrollLockPressed > {};
struct EvRequestShutdown : sc::event< EvRequestShutdown > {};
struct Active;
struct Keyboard : sc::state_machine< Keyboard, Active > {};
struct NumLockOff;
struct CapsLockOff;
struct ScrollLockOff;
struct Active: sc::simple_state<
Active, Keyboard, mpl::list< NumLockOff, CapsLockOff, ScrollLockOff > >
{
typedef sc::custom_reaction< EvRequestShutdown > reactions;
sc::result react( const EvRequestShutdown & );
};
struct NumLockOn : sc::simple_state< NumLockOn, Active::orthogonal< 0 > >
{
typedef sc::transition< EvNumLockPressed, NumLockOff > reactions;
};
struct NumLockOff : sc::simple_state< NumLockOff, Active::orthogonal< 0 > >
{
typedef sc::transition< EvNumLockPressed, NumLockOn > reactions;
};
struct CapsLockOn : sc::simple_state< CapsLockOn, Active::orthogonal< 1 > >
{
typedef sc::transition< EvCapsLockPressed, CapsLockOff > reactions;
};
struct CapsLockOff : sc::simple_state< CapsLockOff, Active::orthogonal< 1 > >
{
typedef sc::transition< EvCapsLockPressed, CapsLockOn > reactions;
};
struct ScrollLockOn : sc::simple_state< ScrollLockOn, Active::orthogonal< 2 > >
{
typedef sc::transition< EvScrollLockPressed, ScrollLockOff > reactions;
};
struct ScrollLockOff : sc::simple_state< ScrollLockOff, Active::orthogonal< 2 > >
{
typedef sc::transition< EvScrollLockPressed, ScrollLockOn > reactions;
};
sc::result Active::react( const EvRequestShutdown & )
{
if ( ( state_downcast< const NumLockOff * >() != 0 ) &&
( state_downcast< const CapsLockOff * >() != 0 ) &&
( state_downcast< const ScrollLockOff * >() != 0 ) )
{
std::cout << "Shutdown request accepted\n";
return terminate();
}
else
{
std::cout << "Ignoring shutdown request\n\n";
return discard_event();
}
}
//////////////////////////////////////////////////////////////////////////////
void DisplayStateConfiguration( const Keyboard & keyboard )
{
char orthogonalRegion = 'a';
for ( Keyboard::state_iterator pLeafState = keyboard.state_begin();
pLeafState != keyboard.state_end(); ++pLeafState )
{
std::cout << "Orthogonal region " << orthogonalRegion << ": ";
const Keyboard::state_base_type * pState = &*pLeafState;
while ( pState != 0 )
{
if ( pState != &*pLeafState )
{
std::cout << " -> ";
}
#ifdef BOOST_STATECHART_USE_NATIVE_RTTI
std::cout << std::setw( 15 ) << typeid( *pState ).name();
#else
std::cout << std::setw( 15 ) <<
pState->custom_dynamic_type_ptr< char >();
#endif
pState = pState->outer_state_ptr();
}
std::cout << "\n";
++orthogonalRegion;
}
std::cout << "\n";
}
//////////////////////////////////////////////////////////////////////////////
int main()
{
#ifndef BOOST_STATECHART_USE_NATIVE_RTTI
Active::custom_static_type_ptr( "Active" );
NumLockOn::custom_static_type_ptr( "NumLockOn" );
NumLockOff::custom_static_type_ptr( "NumLockOff" );
CapsLockOn::custom_static_type_ptr( "CapsLockOn" );
CapsLockOff::custom_static_type_ptr( "CapsLockOff" );
ScrollLockOn::custom_static_type_ptr( "ScrollLockOn" );
ScrollLockOff::custom_static_type_ptr( "ScrollLockOff" );
#endif
std::cout << "Boost.Statechart Keyboard example\n\n";
Keyboard keyboard;
keyboard.initiate();
DisplayStateConfiguration( keyboard );
keyboard.process_event( EvNumLockPressed() );
DisplayStateConfiguration( keyboard );
keyboard.process_event( EvRequestShutdown() );
keyboard.process_event( EvCapsLockPressed() );
DisplayStateConfiguration( keyboard );
keyboard.process_event( EvRequestShutdown() );
keyboard.process_event( EvScrollLockPressed() );
DisplayStateConfiguration( keyboard );
keyboard.process_event( EvRequestShutdown() );
keyboard.process_event( EvNumLockPressed() );
DisplayStateConfiguration( keyboard );
keyboard.process_event( EvRequestShutdown() );
keyboard.process_event( EvCapsLockPressed() );
DisplayStateConfiguration( keyboard );
keyboard.process_event( EvRequestShutdown() );
keyboard.process_event( EvScrollLockPressed() );
DisplayStateConfiguration( keyboard );
keyboard.process_event( EvRequestShutdown() );
return 0;
}
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