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91 lines
3.3 KiB
91 lines
3.3 KiB
// Copyright (c) 2001-2011 Joel de Guzman |
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// Copyright (c) 2001-2011 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_REFERENCE_APR_17_2009_1057PM) |
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#define BOOST_SPIRIT_KARMA_REFERENCE_APR_17_2009_1057PM |
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#if defined(_MSC_VER) |
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#pragma once |
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#endif |
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#include <boost/spirit/home/karma/meta_compiler.hpp> |
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#include <boost/spirit/home/karma/generator.hpp> |
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#include <boost/spirit/home/support/info.hpp> |
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#include <boost/spirit/home/support/handles_container.hpp> |
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#include <boost/type_traits/remove_const.hpp> |
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#include <boost/ref.hpp> |
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namespace boost { namespace spirit { namespace karma |
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{ |
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/////////////////////////////////////////////////////////////////////////// |
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// reference is a generator that references another generator (its Subject) |
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/////////////////////////////////////////////////////////////////////////// |
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template <typename Subject> |
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struct reference : generator<reference<Subject> > |
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{ |
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typedef mpl::int_<generator_properties::all_properties> properties; |
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typedef Subject subject_type; |
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reference(Subject& subject) |
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: ref(subject) {} |
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template <typename Context, typename Unused> |
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struct attribute : Subject::template attribute<Context, Unused> {}; |
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// Default overload, used whenever the attribute is not unused and not |
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// used from an aliased rule. |
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template <typename OutputIterator, typename Context |
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, typename Delimiter, typename Attribute> |
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bool generate(OutputIterator& sink, Context& context |
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, Delimiter const& delim, Attribute const& attr) const |
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{ |
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return ref.get().generate(sink, context, delim, attr); |
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} |
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// This overload gets called from an aliased rule only, we take the |
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// attribute from the context provided from the wrapper rule. |
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template <typename OutputIterator, typename Context |
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, typename Delimiter> |
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bool generate(OutputIterator& sink, Context& context |
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, Delimiter const& delim, unused_type) const |
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{ |
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return ref.get().generate(sink, context, delim, context.attributes); |
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} |
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// This overload is used whenever no attribute is given and it is used |
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// not from an aliased rule. |
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template <typename OutputIterator, typename Delimiter> |
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bool generate(OutputIterator& sink, unused_type |
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, Delimiter const& delim, unused_type) const |
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{ |
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return ref.get().generate(sink, unused, delim, unused); |
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} |
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template <typename Context> |
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info what(Context& context) const |
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{ |
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// the reference is transparent (does not add any info) |
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return ref.get().what(context); |
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} |
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boost::reference_wrapper<Subject> ref; |
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}; |
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}}} |
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namespace boost { namespace spirit { namespace traits |
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{ |
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/////////////////////////////////////////////////////////////////////////// |
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template <typename Subject, typename Attribute, typename Context |
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, typename Iterator> |
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struct handles_container<karma::reference<Subject>, Attribute |
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, Context, Iterator> |
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: handles_container<typename remove_const<Subject>::type, Attribute |
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, Context, Iterator> |
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{}; |
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}}} |
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#endif
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