source/src/state-machine.cpp

/*
 * Copyright (C) 2017-2019  Christopher J. Howard
 *
 * This file is part of Antkeeper Source Code.
 *
 * Antkeeper Source Code 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 3 of the License, or
 * (at your option) any later version.
 *
 * Antkeeper Source Code is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Antkeeper Source Code.  If not, see <http://www.gnu.org/licenses/>.
 */

#include "state-machine.hpp"

StateMachine::StateMachine():
	previousState(nullptr),
	currentState(nullptr)
{}

void StateMachine::changeState(const State* nextState)
{
	// Call exit function of current state
	if (currentState && currentState->back())
	{
		currentState->back()();
	}

	// Change state
	previousState = currentState;
	currentState = nextState;

	// Call enter function of next state
	if (currentState && currentState->front())
	{
		currentState->front()();
	}
}