support/nonterminal/locals.hpp

0001 /*=============================================================================
0002     Copyright (c) 2001-2011 Joel de Guzman
0003     Copyright (c) 2001-2011 Hartmut Kaiser
0004
0005     Distributed under the Boost Software License, Version 1.0. (See accompanying
0006     file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
0007 ==============================================================================*/
0008 #if !defined(BOOST_SPIRIT_LOCALS_APRIL_03_2007_0506PM)
0009 #define BOOST_SPIRIT_LOCALS_APRIL_03_2007_0506PM
0010
0011 #if defined(_MSC_VER)
0012 #pragma once
0013 #endif
0014
0015 #include <boost/preprocessor/repetition/enum_params_with_a_default.hpp>
0016 #include <boost/preprocessor/repetition/enum_params.hpp>
0017 #include <boost/mpl/vector.hpp>
0018 #include <boost/mpl/bool.hpp>
0019
0020 #if !defined(BOOST_SPIRIT_MAX_LOCALS_SIZE)
0021 # define BOOST_SPIRIT_MAX_LOCALS_SIZE 10
0022 #else
0023 # if BOOST_SPIRIT_MAX_LOCALS_SIZE < 3
0024 #   undef BOOST_SPIRIT_MAX_LOCALS_SIZE
0025 #   define BOOST_SPIRIT_MAX_LOCALS_SIZE 10
0026 # endif
0027 #endif
0028
0029 namespace boost { namespace spirit
0030 {
0031     ///////////////////////////////////////////////////////////////////////////
0032     template <
0033         BOOST_PP_ENUM_PARAMS_WITH_A_DEFAULT(
0034             BOOST_SPIRIT_MAX_LOCALS_SIZE, typename T, mpl::na)
0035     >
0036     struct locals
0037       : mpl::vector<BOOST_PP_ENUM_PARAMS(BOOST_SPIRIT_MAX_LOCALS_SIZE, T)> {};
0038
0039     ///////////////////////////////////////////////////////////////////////////
0040     namespace detail
0041     {
0042         template <typename T>
0043         struct is_locals
0044           : mpl::false_
0045         {};
0046
0047         template <BOOST_PP_ENUM_PARAMS(BOOST_SPIRIT_MAX_LOCALS_SIZE, typename T)>
0048         struct is_locals<locals<BOOST_PP_ENUM_PARAMS(BOOST_SPIRIT_MAX_LOCALS_SIZE, T)> >
0049           : mpl::true_
0050         {};
0051     }
0052 }}
0053
0054 #endif