implication_expr.h

来自「由matlab开发的hybrid系统的描述语言」· C头文件 代码 · 共 65 行

/*
	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_IMPLICATION_EXPR
#define D_IMPLICATION_EXPR
#ifndef STD_NS
#define STD_NS
using namespace std;
#endif
#include "Binary_expr.h"

/** implication: left -> right Token: -> left and right must be logic */
class Implication_expr : public Binary_expr {
public:
	Implication_expr(Expr * l, Expr * r) : Binary_expr(l, r) { }

	/** convert Implication_expr to CNF */
	CNF_clause * compute_CNF() const;

	virtual string to_matlab() const;

	bool is_number() const;

	Number * compute_number() const;

	void semantic_checks();

private:
	Expr * shallow_copy() const
		{ return new Implication_expr(left, right); }

	string symbol_str() const { return string("->"); }
};
#endif //D_IMPLICATION_EXPR