diff options
Diffstat (limited to 'src/modules/systemlib')
-rw-r--r-- | src/modules/systemlib/state_table.h | 23 |
1 files changed, 15 insertions, 8 deletions
diff --git a/src/modules/systemlib/state_table.h b/src/modules/systemlib/state_table.h index f2709d29f..38378651b 100644 --- a/src/modules/systemlib/state_table.h +++ b/src/modules/systemlib/state_table.h @@ -1,6 +1,6 @@ /**************************************************************************** * - * Copyright (C) 2012 PX4 Development Team. All rights reserved. + * Copyright (C) 2013-2014 PX4 Development Team. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions @@ -35,6 +35,7 @@ * @file state_table.h * * Finite-State-Machine helper class for state table + * @author: Julian Oes <julian@oes.ch> */ #ifndef __SYSTEMLIB_STATE_TABLE_H @@ -43,7 +44,7 @@ class StateTable { public: - typedef void (StateTable::*Action)(); + typedef bool (StateTable::*Action)(); struct Tran { Action action; unsigned nextState; @@ -53,17 +54,23 @@ public: : myTable(table), myNsignals(nSignals), myNstates(nStates) {} #define NO_ACTION &StateTable::doNothing - #define ACTION(_target) static_cast<StateTable::Action>(_target) + #define ACTION(_target) StateTable::Action(_target) virtual ~StateTable() {} void dispatch(unsigned const sig) { - register Tran const *t = myTable + myState*myNsignals + sig; - (this->*(t->action))(); - - myState = t->nextState; + /* get transition using state table */ + Tran const *t = myTable + myState*myNsignals + sig; + /* first up change state, this allows to do further dispatchs in the state functions */ + + /* now execute state function, if it runs with success, accept new state */ + if ((this->*(t->action))()) { + myState = t->nextState; + } + } + bool doNothing() { + return true; } - void doNothing() {} protected: unsigned myState; private: |