locals.hpp

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//  Copyright (c) 2001-2007 Joel de Guzman
//  Copyright (c) 2001-2008 Hartmut Kaiser
// 
//  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)

#if !defined(BOOST_SPIRIT_LOCALS_APR_03_2007_0506PM)
#define BOOST_SPIRIT_LOCALS_APR_03_2007_0506PM

#if defined(_MSC_VER) && (_MSC_VER >= 1020)
#pragma once      // MS compatible compilers support #pragma once
#endif

#include <boost/mpl/vector.hpp>
#include <boost/mpl/bool.hpp>

#if !defined(BOOST_SPIRIT_MAX_LOCALS_SIZE)
# define BOOST_SPIRIT_MAX_LOCALS_SIZE 10
#else
# if BOOST_SPIRIT_MAX_LOCALS_SIZE < 3
#   undef BOOST_SPIRIT_MAX_LOCALS_SIZE
#   define BOOST_SPIRIT_MAX_LOCALS_SIZE 10
# endif
#endif

namespace boost { namespace spirit 
{
    ///////////////////////////////////////////////////////////////////////////
    template <
        BOOST_PP_ENUM_PARAMS_WITH_A_DEFAULT(
            BOOST_SPIRIT_MAX_LOCALS_SIZE, typename T, mpl::na)
    >
    struct locals
      : mpl::vector<BOOST_PP_ENUM_PARAMS(BOOST_SPIRIT_MAX_LOCALS_SIZE, T)> {};

    ///////////////////////////////////////////////////////////////////////////
    namespace detail
    {
        template <typename T>
        struct is_locals
          : mpl::false_ 
        {};

        template <BOOST_PP_ENUM_PARAMS(BOOST_SPIRIT_MAX_LOCALS_SIZE, typename T)>
        struct is_locals<locals<BOOST_PP_ENUM_PARAMS(BOOST_SPIRIT_MAX_LOCALS_SIZE, T)> >
          : mpl::true_ 
        {};
    }
}}

#endif