C++ FSM implementation

FSM.cpp

#include "FSM.h"

FSM::FSM() :
	state(0)
{
}

void FSM::Update()
{
	if(state) 
	{
		state->Update();
	}
}

void FSM::FixedUpdate()
{
	if(state)
	{
		state->FixedUpdate();
	}
}

void FSM::SetStateCommon(State* new_state)
{
	if(state)
	{
		state->Exit();
		state->fsm = 0;
	}
	state = new_state;
	if(state)
	{
		state->fsm = this;
	}
}

void FSM::SetState(State0Params* state)
{
	State* old_state = this->state;
	SetStateCommon(state);
	if(state)
		state->Enter();
	OnStatusChanged(old_state, state);
}