proto/detail/or_n.hpp

0001 #if !defined(BOOST_PROTO_DONT_USE_PREPROCESSED_FILES)
0002
0003     #include <boost/proto/detail/preprocessed/or_n.hpp>
0004
0005 #elif !defined(BOOST_PP_IS_ITERATING)
0006
0007     #if defined(__WAVE__) && defined(BOOST_PROTO_CREATE_PREPROCESSED_FILES)
0008         #pragma wave option(preserve: 2, line: 0, output: "preprocessed/or_n.hpp")
0009     #endif
0010
0011     ///////////////////////////////////////////////////////////////////////////////
0012     /// \file or_n.hpp
0013     /// Definitions of or_N
0014     //
0015     //  Copyright 2008 Eric Niebler. Distributed under the Boost
0016     //  Software License, Version 1.0. (See accompanying file
0017     //  LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
0018
0019     #if defined(__WAVE__) && defined(BOOST_PROTO_CREATE_PREPROCESSED_FILES)
0020         #pragma wave option(preserve: 1)
0021     #endif
0022
0023     #define BOOST_PP_ITERATION_PARAMS_1                                                             \
0024         (3, (2, BOOST_PROTO_MAX_LOGICAL_ARITY, <boost/proto/detail/or_n.hpp>))
0025     #include BOOST_PP_ITERATE()
0026
0027     #if defined(__WAVE__) && defined(BOOST_PROTO_CREATE_PREPROCESSED_FILES)
0028         #pragma wave option(output: null)
0029     #endif
0030
0031 #else // BOOST_PP_IS_ITERATING
0032
0033     #define N BOOST_PP_ITERATION()
0034
0035     template<bool B, typename Expr, typename BasicExpr, BOOST_PP_ENUM_PARAMS(N, typename G)>
0036     struct BOOST_PP_CAT(or_, N)
0037     #if 2 == N
0038       : mpl::bool_<matches_<Expr, BasicExpr, typename G1::proto_grammar>::value>
0039     {
0040         typedef G1 which;
0041     };
0042     #else
0043       : BOOST_PP_CAT(or_, BOOST_PP_DEC(N))<
0044             matches_<Expr, BasicExpr, typename G1::proto_grammar>::value
0045           , Expr, BasicExpr, BOOST_PP_ENUM_SHIFTED_PARAMS(N, G)
0046         >
0047     {};
0048     #endif
0049
0050     template<typename Expr, typename BasicExpr BOOST_PP_ENUM_TRAILING_PARAMS(N, typename G)>
0051     struct BOOST_PP_CAT(or_, N)<true, Expr, BasicExpr, BOOST_PP_ENUM_PARAMS(N, G)>
0052       : mpl::true_
0053     {
0054         typedef G0 which;
0055     };
0056
0057     #undef N
0058
0059 #endif