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/*
ids.cc, copyright (c) 2006 by Vincent Fourmond:
Code for the handling of IDs...
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 <string.h>
#include <stdlib.h>
#include <calc_internals.hh>
namespace SCalc {
ID::ID(Session * s, const char * name) :
Expression(s), value(name)
{
id = -1; // not initialized yet
}
ID::~ID()
{
}
const char * ID::name()
{
return value.c_str();
}
int ID::register_id()
{
return session()->register_varname(value);
}
void ID::dump(::std::ostream & stream)
{
stream << "ID: " << id << " (" << name() << ") ";
}
std::string ID::pretty_print()
{
std::string str;
str+= "ID ";
str+= name();
return str;
}
/*******************************************************************/
/** definitions for the Var class, now */
Var::Var(Session * s, ID * newID) : Expression(s)
{
id = newID->register_id();
delete newID; // destroy after use
}
double Var::evaluate(const double * vars, const double *)
{
return vars[id];
}
void Var::dump(::std::ostream & stream)
{
stream << "Var : " << name() << " (id : "
<< id << ")";
}
std::set<int> Var::used_variables()
{
std::set<int> a;
a.insert(id);
return a;
}
Expression * Var::derive(int i)
{
if(i == id)
return new Const(session(), 1.0);
else
return new Null(session());
}
};
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