//
// Copyright (c) 2009 Rutger ter Borg
//
// Distributed under the Boost Software License, Version 1.0.
// (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
//

#ifndef BOOST_NUMERIC_BINDINGS_DETAIL_IF_LEFT_HPP
#define BOOST_NUMERIC_BINDINGS_DETAIL_IF_LEFT_HPP

#include <Core/Utils/numeric/bindings/tag.hpp>

namespace boost
{
    namespace numeric
    {
        namespace bindings
        {
            namespace detail
            {
                template <typename Side, typename Left, typename Right>
                struct if_left_impl
                {
                    typedef Right result_type;

                    static result_type invoke(Left, Right right)
                    {
                        return right;
                    }
                };

                template <typename Left, typename Right>
                struct if_left_impl<tag::left, Left, Right>
                {
                    typedef Left result_type;

                    static result_type invoke(Left left, Right)
                    {
                        return left;
                    }
                };

                // by-value
                template <typename Side, typename Left, typename Right>
                typename if_left_impl<Side, const Left, const Right>::result_type
                if_left(const Side, const Left left, const Right right)
                {
                    return if_left_impl<Side, const Left, const Right>::invoke(left, right);
                }
            } // namespace detail
        } // namespace bindings
    } // namespace numeric
} // namespace boost

#endif
