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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)
//////////////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////////////
// This is a quick-and-dirty handcrafted state machine with two states and two
// transitions employing GOF-visitation (two virtual calls per event).
// It is used to make speed comparisons with Boost.Statechart machines.
//////////////////////////////////////////////////////////////////////////////
#include <boost/config.hpp>
#include <iostream>
#include <iomanip>
#include <ctime>
#ifdef BOOST_NO_STDC_NAMESPACE
namespace std
{
using ::clock_t;
using ::clock;
}
#endif
#ifdef BOOST_INTEL
# pragma warning( disable: 304 ) // access control not specified
#endif
//////////////////////////////////////////////////////////////////////////////
class EvFlipBit;
class state_base
{
public:
virtual ~state_base() {};
virtual const state_base & react( const EvFlipBit & toEvent ) const = 0;
protected:
state_base() {}
};
template< class Derived >
class state : public state_base
{
public:
static const Derived & instance()
{
return instance_;
}
private:
static const Derived instance_;
};
template< class Derived >
const Derived state< Derived >::instance_;
//////////////////////////////////////////////////////////////////////////////
class event_base
{
public:
virtual ~event_base() {}
protected:
event_base() {}
public:
virtual const state_base & send( const state_base & toState ) const = 0;
};
template< class Derived >
class event : public event_base
{
protected:
event() {}
private:
virtual const state_base & send( const state_base & toState ) const
{
return toState.react( *static_cast< const Derived * >( this ) );
}
};
//////////////////////////////////////////////////////////////////////////////
class EvFlipBit : public event< EvFlipBit > {};
const EvFlipBit flip;
class BitMachine
{
public:
//////////////////////////////////////////////////////////////////////////
BitMachine() : pCurrentState_( &Off::instance() ) {}
void process_event( const event_base & evt )
{
pCurrentState_ = &evt.send( *pCurrentState_ );
}
private:
//////////////////////////////////////////////////////////////////////////
struct On : state< On >
{
virtual const state_base & react( const EvFlipBit & ) const
{
return Off::instance();
}
};
struct Off : state< Off >
{
virtual const state_base & react( const EvFlipBit & ) const
{
return On::instance();
}
};
const state_base * pCurrentState_;
};
//////////////////////////////////////////////////////////////////////////////
char GetKey()
{
char key;
std::cin >> key;
return key;
}
//////////////////////////////////////////////////////////////////////////////
int main()
{
// common prime factors of 2^n-1 for n in [1,8]
const unsigned int noOfEvents = 3 * 3 * 5 * 7 * 17 * 31 * 127;
unsigned long eventsSentTotal = 0;
std::cout << "Boost.Statechart Handcrafted example\n";
std::cout << "Machine configuration: " << 2 <<
" states interconnected with " << 2 << " transitions.\n\n";
std::cout << "p<CR>: Performance test\n";
std::cout << "e<CR>: Exits the program\n\n";
std::cout <<
"You may chain commands, e.g. pe<CR> performs a test and then exits the program\n\n";
BitMachine bitMachine;
char key = GetKey();
while ( key != 'e' )
{
switch ( key )
{
case 'p':
{
std::cout << "\nSending " << noOfEvents <<
" events. Please wait...\n";
const unsigned long startEvents2 = eventsSentTotal;
const std::clock_t startTime2 = std::clock();
for ( unsigned int eventNo = 0; eventNo < noOfEvents; ++eventNo )
{
bitMachine.process_event( flip );
++eventsSentTotal;
}
const std::clock_t elapsedTime2 = std::clock() - startTime2;
const unsigned int eventsSent2 = eventsSentTotal - startEvents2;
std::cout << "Time to dispatch one event and\n" <<
"perform the resulting transition: ";
std::cout << elapsedTime2 * 1000.0 / eventsSent2 << " microseconds\n\n";
}
break;
default:
{
std::cout << "Invalid key!\n";
}
}
key = GetKey();
}
return 0;
}
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