Expression.h

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/*CXXR $Id: Expression.h 1351 2013-03-08 15:12:28Z arr $
 *CXXR
 *CXXR This file is part of CXXR, a project to refactor the R interpreter
 *CXXR into C++.  It may consist in whole or in part of program code and
 *CXXR documentation taken from the R project itself, incorporated into
 *CXXR CXXR (and possibly MODIFIED) under the terms of the GNU General Public
 *CXXR Licence.
 *CXXR 
 *CXXR CXXR is Copyright (C) 2008-13 Andrew R. Runnalls, subject to such other
 *CXXR copyrights and copyright restrictions as may be stated below.
 *CXXR 
 *CXXR CXXR is not part of the R project, and bugs and other issues should
 *CXXR not be reported via r-bugs or other R project channels; instead refer
 *CXXR to the CXXR website.
 *CXXR */

/*
 *  R : A Computer Language for Statistical Data Analysis
 *  Copyright (C) 1995, 1996  Robert Gentleman and Ross Ihaka
 *  Copyright (C) 1999-2006   The R Development Core Team.
 *
 *  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 2.1 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 Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, a copy is available at
 *  http://www.r-project.org/Licenses/
 */

#ifndef EXPRESSION_H
#define EXPRESSION_H

#include "CXXR/PairList.h"

#ifdef __cplusplus

#include <boost/serialization/access.hpp>
#include <boost/serialization/nvp.hpp>

namespace CXXR {
    class Expression : public ConsCell {
    public:
        explicit Expression(RObject* cr = 0, PairList* tl = 0,
                            const RObject* tg = 0)
            : ConsCell(LANGSXP, cr, tl, tg)
        {}

        Expression(const Expression& pattern)
            : ConsCell(pattern)
        {}

        static const char* staticTypeName()
        {
            return "language";
        }

        // Virtual functions of RObject:
        Expression* clone() const;
        RObject* evaluate(Environment* env);
        const char* typeName() const;
    private:
        friend class boost::serialization::access;
        // Declared private to ensure that Expression objects are
        // allocated only using 'new':
        ~Expression() {}

        // Not implemented yet.  Declared to prevent
        // compiler-generated versions:
        Expression& operator=(const Expression&);

        template<class Archive>
        void serialize(Archive & ar, const unsigned int version) {
            ar & BOOST_SERIALIZATION_BASE_OBJECT_NVP(ConsCell);
        }
    };
} // namespace CXXR

BOOST_CLASS_EXPORT_KEY(CXXR::Expression)


    extern CXXR::GCRoot<> R_CurrentExpr;

extern "C" {
#endif

    SEXP Rf_currentExpression();

    SEXP Rf_lcons(SEXP cr, SEXP tl);

    void Rf_setCurrentExpression(SEXP e);
#ifdef __cplusplus
}
#endif

#endif /* EXPRESSION_H */