NumberNode.h

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/*
 * opencog/atoms/NumberNode.h
 *
 * Copyright (C) 2015 Linas Vepstas
 * All Rights Reserved
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License v3 as
 * published by the Free Software Foundation and including the exceptions
 * at http://opencog.org/wiki/Licenses
 *
 * 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.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program; if not, write to:
 * Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

#ifndef _OPENCOG_NUMBER_NODE_H
#define _OPENCOG_NUMBER_NODE_H

#include <opencog/atomspace/AtomSpace.h>
#include <opencog/atomspace/Node.h>

namespace opencog
{
class NumberNode : public Node
{
protected:
    double value;

public:
    NumberNode(const std::string& s,
               TruthValuePtr tv = TruthValue::DEFAULT_TV(),
               AttentionValuePtr av = AttentionValue::DEFAULT_AV())
        // Convert to number and back to string to avoid miscompares.
        : Node(NUMBER_NODE, std::to_string(std::stod(s)), tv, av),
          value(std::stod(s))
    {}

    NumberNode(double vvv,
               TruthValuePtr tv = TruthValue::DEFAULT_TV(),
               AttentionValuePtr av = AttentionValue::DEFAULT_AV())
        : Node(NUMBER_NODE, std::to_string(vvv), tv, av),
          value(vvv)
    {}

    NumberNode(Node &n)
        : Node(NUMBER_NODE, std::to_string(std::stod(n.getName())),
               n.getTruthValue()->clone(), n.getAttentionValue()->clone()),
          value(std::stod(n.getName()))
    {
        OC_ASSERT(NUMBER_NODE == n.getType(), "Bad NumberNode constructor!");
    }

    static std::string validate(const std::string& str)
    {
        return std::to_string(std::stod(str));
    }

    double get_value(void) { return value; }
};

typedef std::shared_ptr<NumberNode> NumberNodePtr;
static inline NumberNodePtr NumberNodeCast(const Handle& h)
    { AtomPtr a(h); return std::dynamic_pointer_cast<NumberNode>(a); }
static inline NumberNodePtr NumberNodeCast(AtomPtr a)
    { return std::dynamic_pointer_cast<NumberNode>(a); }

// XXX temporary hack ...
#define createNumberNode std::make_shared<NumberNode>

}

#endif // _OPENCOG_NUMBER_NODE_H