127 lines
3.8 KiB
C++
Executable File
127 lines
3.8 KiB
C++
Executable File
// Copyright (c) 2001-2008 Hartmut Kaiser
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//
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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#if !defined(BOOST_SPIRIT_KARMA_META_GRAMMAR_MAY_01_2007_0313PM)
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#define BOOST_SPIRIT_KARMA_META_GRAMMAR_MAY_01_2007_0313PM
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#if defined(_MSC_VER) && (_MSC_VER >= 1020)
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#pragma once // MS compatible compilers support #pragma once
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#endif
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#include <boost/spirit/home/karma/domain.hpp>
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#include <boost/spirit/home/support/meta_grammar.hpp>
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#include <boost/utility/enable_if.hpp>
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namespace boost { namespace spirit { namespace karma
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{
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///////////////////////////////////////////////////////////////////////////
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// forwards
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///////////////////////////////////////////////////////////////////////////
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template <typename Char>
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struct any_stream;
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template <typename Char>
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struct stream_director;
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struct main_meta_grammar;
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template <typename Expr, typename Enable>
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struct is_valid_expr;
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template <typename Expr, typename Enable>
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struct expr_transform;
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///////////////////////////////////////////////////////////////////////////
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// get the director for a stream
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///////////////////////////////////////////////////////////////////////////
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template <typename Tag>
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struct extract_any_stream_director;
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template <>
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struct extract_any_stream_director<tag::stream>
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{
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typedef any_stream<char> type;
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};
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template <>
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struct extract_any_stream_director<tag::wstream>
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{
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typedef any_stream<wchar_t> type;
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};
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///////////////////////////////////////////////////////////////////////////
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template <typename Tag, typename T>
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struct extract_stream_director;
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template <typename T>
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struct extract_stream_director<tag::stream, T>
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{
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typedef stream_director<char> type;
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};
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template <typename T>
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struct extract_stream_director<tag::wstream, T>
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{
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typedef stream_director<wchar_t> type;
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};
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///////////////////////////////////////////////////////////////////////////
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// utility meta-grammar
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///////////////////////////////////////////////////////////////////////////
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struct utility_meta_grammar
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: proto::or_<
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// stream, wstream
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meta_grammar::compose_empty<
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proto::if_<
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is_stream_tag<proto::_arg, karma::domain>()
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>,
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karma::domain,
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mpl::identity<extract_any_stream_director<mpl::_> >
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>,
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// stream(T), wstream(T)
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meta_grammar::compose_function1_eval<
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proto::function<
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proto::if_<
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is_stream_tag<proto::_arg, karma::domain>()
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>,
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proto::_
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>,
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karma::domain,
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mpl::identity<extract_stream_director<mpl::_, mpl::_> >
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>
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>
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{
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};
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///////////////////////////////////////////////////////////////////////////
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// These specializations non-intrusively hook into the Karma meta-grammar.
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// (see karma/meta_grammar.hpp)
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///////////////////////////////////////////////////////////////////////////
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template <typename Expr>
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struct is_valid_expr<
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Expr,
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typename enable_if<
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proto::matches<Expr, utility_meta_grammar>
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>::type
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>
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: mpl::true_
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{
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};
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template <typename Expr>
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struct expr_transform<
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Expr,
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typename enable_if<
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proto::matches<Expr, utility_meta_grammar>
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>::type
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>
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: mpl::identity<utility_meta_grammar>
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{
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};
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}}}
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#endif
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