/usr/include/tjutils/tjstate.h is in libodin-dev 1.8.4-1ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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tjstate.h - description
-------------------
begin : Sun Sep 28 2003
copyright : (C) 2001 by Thies H. Jochimsen
email : jochimse@cns.mpg.de
***************************************************************************/
/***************************************************************************
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
***************************************************************************/
#ifndef TJSTATE_H
#define TJSTATE_H
#include <tjutils/tjutils.h>
#include <tjutils/tjlabel.h>
#include <tjutils/tjlog.h>
/**
* @addtogroup tjutils
* @{
*/
///////////////////////////////////////////////////////////////
class StateComponent {
public:
static const char* get_compName();
};
///////////////////////////////////////////////////////////////
template <class T> class State : public Labeled {
public:
typedef bool (T::* transition) ();
State(T* statemachine, const char* statelabel, State* prerequired_state, transition tr)
: Labeled(statelabel), machine(statemachine), pre_state(prerequired_state), trans(tr) {
Log<StateComponent> odinlog(this,"State()");
}
bool obtain_state() {
Log<StateComponent> odinlog(this,"obtain_state");
// return if we are already in the desired state
if(machine->current_state==this) return true;
// try a registered direct transition
if(machine->direct_transition(this)) return true;
if(pre_state) { // check whether a prerequisite state exists and obtain that state
if(!pre_state->obtain_state()) return false;
}
bool result=(machine->*trans)(); // perform the transition
if(result) machine->current_state=this;
return result;
}
private:
T* machine;
State* pre_state;
transition trans;
};
///////////////////////////////////////////////////////////////
template <class T>
struct DirectTransition {
DirectTransition(State<T>* init, State<T>* dest, typename State<T>::transition tr) : init_state(init), dest_state(dest), trans(tr) {
Log<StateComponent> odinlog("DirectTransition","DirectTransition()");
}
bool operator == (const DirectTransition<T>& dt) const {return init_state==dt.init_state && dest_state==dt.dest_state && trans==dt.trans;}
bool operator != (const DirectTransition<T>& dt) const {return !(*this==dt);}
bool operator < (const DirectTransition<T>& dt) const {return init_state<dt.init_state && dest_state<dt.dest_state;}
State<T>* init_state;
State<T>* dest_state;
typename State<T>::transition trans;
};
///////////////////////////////////////////////////////////////
template <class T>
class StateMachine {
protected:
StateMachine(State<T>* first_state) : current_state(first_state) {
Log<StateComponent> odinlog("StateMachine","StateMachine()");
}
const STD_string& get_current_state_label() const {return current_state->get_label();}
void register_direct_trans(State<T>* init, State<T>* dest, typename State<T>::transition tr) {
direct_trans.push_back( DirectTransition<T>(init,dest,tr) );
}
bool direct_transition(State<T>* dest) {
typename STD_list<DirectTransition<T> >::iterator it;
for(it=direct_trans.begin(); it!=direct_trans.end(); ++it) {
if( (it->init_state==current_state) && (it->dest_state==dest) ) {
typename State<T>::transition tt=it->trans;
bool result=((T*)(this)->*tt)();
if(result) current_state=dest;
return result;
}
}
return false;
}
private:
friend class State<T>;
STD_list<DirectTransition<T> > direct_trans;
State<T>* current_state;
};
/** @}
*/
#endif
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