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/*
const.hh, copyright (c) 2006 by Vincent Fourmond:
The class definitions for constant values.
This program 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.
This program 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 (in the COPYING file).
*/
/* expression.hh should be included */
namespace SCalc {
/**
The class that represents a value
*/
class Const : public Expression {
protected:
double value;
public:
Const(Session * s, double v) : Expression(s) {value = v;};
virtual ~Const() {;};
virtual double evaluate(const double *, const double *) { return value;};
virtual void dump(::std::ostream & stream);
/// Const-related functions
virtual int is_null() { return value == 0;};
virtual int is_id() { return value == 1.0;};
virtual int is_const() { return 1;};
virtual Expression * copy() { return new Const(session(), value);};
virtual std::string pretty_print();
};
class Null : public Expression {
public:
Null(Session * s) : Expression(s) {;};
virtual ~Null() {;};
virtual double evaluate(const double *, const double *) { return 0.0;};
virtual void dump(::std::ostream & stream);
/// Const-related functions
virtual int is_null() { return 1;};
virtual int is_const() { return 1;};
virtual Expression * copy() { return new Null(session());};
virtual std::string pretty_print() {return std::string("0");};
};
};
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