logic_literal.h

由matlab开发的hybrid系统的描述语言

/*
	HYSDEL
	Copyright (C) 1999-2002  Fabio D. Torrisi

	This file is part of HYSDEL.
    
	HYSDEL 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 2 of the License, or (at your option) any later version.

	HYSDEL 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 this library; if not, write to the Free Software
	Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA

	CONTACT INFORMATION
	===================
	Fabio D. Torrisi
	ETH Zentrum
	Physikstrasse. 3 ETL,
	CH-8032 Zurich
	Switzerland
	mailto:[e-mail] (preferred)
*/

#ifndef D_LOGIC_LITERAL
#define D_LOGIC_LITERAL
#ifndef STD_NS
#define STD_NS
using namespace std;
#endif

#include "string"

class Var_symbol;

/** A possibly negated boolean variable */
class Logic_literal {
public:

	Logic_literal(bool n, const Var_symbol * s);

	Logic_literal * clone();

	/** returns true iff they refer to the same variable and both
	 * are negated or both are not negated */
	bool is_equal(const Logic_literal * equal) const;

	bool get_neg() const;

	const Var_symbol * get_variable() const;

	/** output in human-readable form, for debug only */
	string to_string() const;

	void negate() { neg = !neg; }

private:

	/** true if the variable is to be negated */
	bool neg;

	/** either Bool_var_symbol or Bool_param_symbol */
	const Var_symbol * variable;
};
#endif //D_LOGIC_LITERAL