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/*
neg.cc, copyright (c) 2006 by Vincent Fourmond:
The class implemenation for negation.
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).
*/
#include <calc_internals.hh>
namespace SCalc {
std::string Neg::pretty_print()
{
std::string retval = "-";
retval += neg->pretty_print();
return retval;
}
Expression * Neg::simplify()
{
Expression * sub = neg->simplify();
if(sub->is_null())
{
delete sub;
return new Null(session());
}
if(sub->is_const())
{
double val = sub->evaluate(NULL, NULL);
delete sub;
return new Const(session(), - val);
}
return new Neg(session(), sub);
}
};
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