fsm's Introduction

FSM - C++ Template-based Finite State Machine

This small header file fsm.h provides a simple state machine implementation based on C++ template programming. It supports handling incoming events and entry/exit calls for each state. It does not support hierarchical state machines, tracing, explicit start/stop states etc.

It's aim is to be usable with minimal overhead in the client code. Thus, there is no need to declare and implement hierarchies of state classes or construct tables of state transitions and functions to call. The example in lightswitch.cpp shows a simple usage example of a light switch that only receives a single kind of event.

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Visual Studio 2015 compiling error???

fsm.h was unable to compiled caused by "template" keyword error:

1>f:\projectarea\googletest\gtestharness\fsm.h(38): error C2059: syntax error: 'template'
1> f:\projectarea\googletest\gtestharness\fsm.h(124): note: see reference to function template instantiation 'int SwitchTemplate::work<StateMachine<LightSwitch,STATELIST>::CallEventNoData>(int,CONTEXT &)' being compiled
1> with
1> [
1> STATELIST=LightSwitch::StateList,
1> CONTEXT=StateMachine<LightSwitch,LightSwitch::StateList>::CallEventNoData
1> ]
1> f:\projectarea\googletest\gtestharness\fsm.h(124): note: see reference to function template instantiation 'int SwitchTemplate::work<StateMachine<LightSwitch,STATELIST>::CallEventNoData>(int,CONTEXT &)' being compiled
1> with
1> [
1> STATELIST=LightSwitch::StateList,
1> CONTEXT=StateMachine<LightSwitch,LightSwitch::StateList>::CallEventNoData
1> ]
1> f:\projectarea\googletest\gtestharness\fsm.h(122): note: while compiling class template member function 'void StateMachine<LightSwitch,LightSwitch::StateList>::work(void)'
1> f:\projectarea\googletest\gtestharness\fsm_test.cpp(34): note: see reference to function template instantiation 'void StateMachine<LightSwitch,LightSwitch::StateList>::work(void)' being compiled
1> f:\projectarea\googletest\gtestharness\fsm_test.cpp(32): note: see reference to class template instantiation 'StateMachine<LightSwitch,LightSwitch::StateList>' being compiled
1>f:\projectarea\googletest\gtestharness\fsm.h(38): error C2951: template declarations are only permitted at global, namespace, or class scope

Thanks
Lu

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fsm's Introduction

FSM - C++ Template-based Finite State Machine

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Visual Studio 2015 compiling error???

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