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/*
operators.hh, copyright (c) 2006 by Vincent Fourmond:
The class definitions for the operators.
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 {
class Operator : public Expression {
protected:
// The left and rigth members of the operator:
Expression * left;
Expression * right;
virtual const char * name() = 0;
/// This function should be redefined by the children to
/// implement specific rules for simplification. It should
/// return NULL if nothing has been found, or a
/// simplified expression is case something was simplified
virtual Expression * specific_rules(Expression * l,
Expression * r) { return NULL;};
/// To be redefined by children to 'remake' operation if
/// necessary... times->op(a,b) -> "a * b"...
virtual Operator * op(Expression * l, Expression * r) = 0;
public:
Operator(Session * s, Expression *l, Expression *r) : Expression(s)
{ left = l; right = r;};
virtual ~Operator() {delete left; delete right;};
// Also pure virtual, as there is no implementation...
virtual double evaluate(const double *, const double *) = 0;
virtual void dump(::std::ostream & stream = ::std::cerr);
virtual std::set<int> used_variables();
virtual std::string pretty_print();
/// One function for all, the subclasses should better reimplement the
/// specific_rules.
virtual Expression * simplify();
};
class Plus : public Operator {
protected:
virtual const char * name() { return "+";};
virtual Operator * op(Expression * l, Expression * r)
{ return new Plus(session(), l,r);};
virtual Expression * specific_rules(Expression * l,
Expression * r);
public:
Plus(Session * s, Expression *l, Expression *r) : Operator(s,l,r) {;};
virtual ~Plus() {;} ;
virtual double evaluate(const double * vals, const double * vars)
{ return
left->evaluate(vals,vars) +
right->evaluate(vals,vars);
};
virtual Expression * derive(int id);
virtual Expression * copy()
{
return new Plus(session(),
left->copy(),
right->copy());
};
};
class Minus : public Operator {
protected:
virtual const char * name() { return "-";};
virtual Operator * op(Expression * l, Expression * r)
{ return new Minus(session(), l,r);};
virtual Expression * specific_rules(Expression * l,
Expression * r);
public:
Minus(Session * s, Expression *l, Expression *r) : Operator(s,l,r) {;};
virtual ~Minus() {;} ;
virtual double evaluate(const double *vals, const double * vars)
{ return
left->evaluate(vals,vars) -
right->evaluate(vals,vars);
};
virtual Expression * derive(int id);
virtual Expression * copy()
{
return new Minus(session(),
left->copy(),
right->copy());
};
};
class Times : public Operator {
protected:
virtual const char * name() { return "*";};
virtual Operator * op(Expression * l, Expression * r)
{ return new Times(session(), l,r);};
virtual Expression * specific_rules(Expression * l,
Expression * r);
public:
Times(Session * s, Expression *l, Expression *r) : Operator(s,l,r) {;};
virtual ~Times() {;} ;
virtual double evaluate(const double *vals, const double * vars)
{ return
left->evaluate(vals,vars) *
right->evaluate(vals,vars);
};
virtual Expression * derive(int id);
virtual Expression * copy()
{
return new Times(session(),
left->copy(),
right->copy());
};
};
class Divides : public Operator {
protected:
virtual const char * name() { return "/";};
virtual Operator * op(Expression * l, Expression * r)
{ return new Divides(session(), l,r);};
virtual Expression * specific_rules(Expression * l,
Expression * r);
public:
Divides(Session * s, Expression *l, Expression *r) : Operator(s,l,r) {;};
virtual ~Divides() {;} ;
virtual double evaluate(const double *vals, const double * vars)
{ return left->evaluate(vals,vars) /
right->evaluate(vals,vars);};
virtual Expression * derive(int id);
virtual Expression * copy()
{
return new Divides(session(),
left->copy(),
right->copy());
};
};
class Power : public Operator {
protected:
virtual const char * name() { return "^";};
virtual Operator * op(Expression * l, Expression * r)
{ return new Power(session(), l,r);};
virtual Expression * specific_rules(Expression * l,
Expression * r);
public:
Power(Session * s, Expression *l, Expression *r) : Operator(s,l,r) {;};
virtual ~Power() {;} ;
virtual double evaluate(const double *vals, const double * vars);
virtual Expression * derive(int id);
virtual Expression * copy()
{
return new Power(session(),
left->copy(),
right->copy());
};
};
};
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