💿🐜 Antkeeper source code
https://antkeeper.com
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73 lines
1.8 KiB
73 lines
1.8 KiB
/*
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* Copyright (C) 2017-2019 Christopher J. Howard
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*
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* This file is part of Antkeeper Source Code.
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*
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* Antkeeper Source Code is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* Antkeeper Source Code is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with Antkeeper Source Code. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef STATE_MACHINE_HPP
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#define STATE_MACHINE_HPP
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#include <array>
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#include <functional>
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/**
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* Extremely lightweight finite-state machine.
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*/
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class StateMachine
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{
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public:
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/**
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* A state is a fixed-size array of function pointers with the first and second elements referring to the state's enter and exit functions, respectively.
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*/
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typedef std::array<std::function<void()>, 2> State;
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/**
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* Creates a state machine, setting the initial state to nullptr.
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*/
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StateMachine();
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/**
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* Changes the current state.
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*/
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void changeState(const State* nextState);
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/**
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* Returns the previous state.
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*/
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const State* getPreviousState() const;
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/**
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* Returns the current state.
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*/
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const State* getCurrentState() const;
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private:
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const State* previousState;
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const State* currentState;
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};
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inline const StateMachine::State* StateMachine::getPreviousState() const
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{
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return previousState;
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}
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inline const StateMachine::State* StateMachine::getCurrentState() const
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{
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return currentState;
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}
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#endif // STATE_MACHINE_HPP
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