DirectAssignmentProxy.hpp

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/* 
 * DirectAssignmentProxy.hpp 
 *
 * Copyright (C) 2003 Thomas Seidel <thomas.seidel@univie.ac.at>
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library 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 Lesser General Public License
 * along with this library; see the file COPYING. If not, write to
 * the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */
 
#ifndef CDPL_MATH_DIRECTASSIGNMENTPROXY_HPP
#define CDPL_MATH_DIRECTASSIGNMENTPROXY_HPP
 
 
namespace CDPL
{
 
    namespace Math
    {
 
        template <typename C>
        class DirectAssignmentProxy
        {
 
            typedef C                       LValueType;
            typedef typename C::ClosureType ClosureType;
 
          public:
            explicit DirectAssignmentProxy(LValueType& lval):
                lvalue(lval) {}
 
            DirectAssignmentProxy(const DirectAssignmentProxy& proxy):
                lvalue(proxy.lvalue) {}
 
            template <typename E>
            ClosureType& operator=(const E& e)
            {
                lvalue.assign(e);
                return lvalue;
            }
 
            template <typename E>
            ClosureType& operator+=(const E& e)
            {
                lvalue.plusAssign(e);
                return lvalue;
            }
 
            template <typename E>
            ClosureType& operator-=(const E& e)
            {
                lvalue.minusAssign(e);
                return lvalue;
            }
 
          private:
            DirectAssignmentProxy(){};
 
            const DirectAssignmentProxy& operator=(const DirectAssignmentProxy&);
 
            ClosureType lvalue;
        };
 
        template <typename C>
        DirectAssignmentProxy<const C> direct(const C& lvalue)
        {
            return DirectAssignmentProxy<const C>(lvalue);
        }
 
        template <typename C>
        DirectAssignmentProxy<C> direct(C& lvalue)
        {
            return DirectAssignmentProxy<C>(lvalue);
        }
    } // namespace Math
} // namespace CDPL
 
#endif // CDPL_MATH_DIRECTASSIGNMENTPROXY_HPP