// 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_POSITIVE_MAR_03_2007_0945PM)
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#define BOOST_SPIRIT_KARMA_POSITIVE_MAR_03_2007_0945PM
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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/domain.hpp>
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#include <boost/spirit/home/karma/generator.hpp>
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#include <boost/spirit/home/karma/meta_compiler.hpp>
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#include <boost/spirit/home/karma/detail/indirect_iterator.hpp>
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#include <boost/spirit/home/karma/detail/output_iterator.hpp>
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#include <boost/spirit/home/karma/detail/get_stricttag.hpp>
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#include <boost/spirit/home/karma/detail/pass_container.hpp>
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#include <boost/spirit/home/karma/detail/fail_function.hpp>
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#include <boost/spirit/home/support/info.hpp>
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#include <boost/spirit/home/support/unused.hpp>
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#include <boost/spirit/home/support/container.hpp>
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#include <boost/spirit/home/support/has_semantic_action.hpp>
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#include <boost/spirit/home/support/handles_container.hpp>
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#include <boost/spirit/home/karma/detail/attributes.hpp>
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#include <boost/proto/operators.hpp>
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#include <boost/proto/tags.hpp>
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#include <boost/type_traits/add_const.hpp>
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namespace boost { namespace spirit
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{
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///////////////////////////////////////////////////////////////////////////
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// Enablers
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///////////////////////////////////////////////////////////////////////////
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template <>
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struct use_operator<karma::domain, proto::tag::unary_plus> // enables +g
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: mpl::true_ {};
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}}
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///////////////////////////////////////////////////////////////////////////////
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namespace boost { namespace spirit { namespace karma
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{
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template <typename Subject, typename Strict, typename Derived>
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struct base_plus : unary_generator<Derived>
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{
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private:
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// Ignore return value in relaxed mode (failing subject generators
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// are just skipped). This allows to selectively generate items in
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// the provided attribute.
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template <typename F, typename Attribute>
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bool generate_subject(F f, Attribute const&, bool& result, mpl::false_) const
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{
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bool r = !f(subject);
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if (r)
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result = true;
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else if (!f.is_at_end())
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f.next();
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return true;
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}
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template <typename F, typename Attribute>
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bool generate_subject(F f, Attribute const&, bool& result, mpl::true_) const
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{
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bool r = !f(subject);
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if (r)
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result = true;
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return r;
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}
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// There is no way to distinguish a failed generator from a
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// generator to be skipped. We assume the user takes responsibility
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// for ending the loop if no attribute is specified.
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template <typename F>
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bool generate_subject(F f, unused_type, bool& result, mpl::false_) const
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{
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bool r = f(subject);
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if (!r)
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result = true;
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return !r;
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}
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// template <typename F>
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// bool generate_subject(F f, unused_type, bool& result, mpl::true_) const
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// {
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// bool r = f(subject);
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// if (!r)
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// result = true;
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// return !r;
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// }
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public:
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typedef Subject subject_type;
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typedef typename subject_type::properties properties;
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// Build a std::vector from the subjects attribute. Note
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// that build_std_vector may return unused_type if the
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// subject's attribute is an unused_type.
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template <typename Context, typename Iterator>
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struct attribute
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: traits::build_std_vector<
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typename traits::attribute_of<subject_type, Context, Iterator>::type
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>
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{};
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base_plus(Subject const& subject)
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: subject(subject) {}
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template <
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typename OutputIterator, typename Context, typename Delimiter
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, typename Attribute>
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bool generate(OutputIterator& sink, Context& ctx
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, Delimiter const& d, Attribute const& attr) const
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{
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typedef detail::fail_function<
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OutputIterator, Context, Delimiter> fail_function;
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typedef typename traits::container_iterator<
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typename add_const<Attribute>::type
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>::type iterator_type;
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typedef
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typename traits::make_indirect_iterator<iterator_type>::type
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indirect_iterator_type;
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typedef detail::pass_container<
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fail_function, Attribute, indirect_iterator_type, mpl::false_>
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pass_container;
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iterator_type it = traits::begin(attr);
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iterator_type end = traits::end(attr);
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// plus fails if the parameter is empty
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if (traits::compare(it, end))
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return false;
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pass_container pass(fail_function(sink, ctx, d),
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indirect_iterator_type(it), indirect_iterator_type(end));
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// from now on plus fails if the underlying output fails or overall
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// no subject generators succeeded
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bool result = false;
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while (!pass.is_at_end())
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{
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if (!generate_subject(pass, attr, result, Strict()))
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break;
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}
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return result && detail::sink_is_good(sink);
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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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return info("plus", subject.what(context));
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}
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Subject subject;
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};
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template <typename Subject>
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struct plus
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: base_plus<Subject, mpl::false_, plus<Subject> >
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{
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typedef base_plus<Subject, mpl::false_, plus> base_plus_;
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plus(Subject const& subject)
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: base_plus_(subject) {}
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};
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template <typename Subject>
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struct strict_plus
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: base_plus<Subject, mpl::true_, strict_plus<Subject> >
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{
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typedef base_plus<Subject, mpl::true_, strict_plus> base_plus_;
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strict_plus(Subject const& subject)
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: base_plus_(subject) {}
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};
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///////////////////////////////////////////////////////////////////////////
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// Generator generators: make_xxx function (objects)
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///////////////////////////////////////////////////////////////////////////
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namespace detail
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{
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template <typename Elements, bool strict_mode = false>
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struct make_plus
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: make_unary_composite<Elements, plus>
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{};
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template <typename Elements>
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struct make_plus<Elements, true>
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: make_unary_composite<Elements, strict_plus>
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{};
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}
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template <typename Elements, typename Modifiers>
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struct make_composite<proto::tag::unary_plus, Elements, Modifiers>
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: detail::make_plus<Elements, detail::get_stricttag<Modifiers>::value>
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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>
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struct has_semantic_action<karma::plus<Subject> >
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: unary_has_semantic_action<Subject> {};
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template <typename Subject>
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struct has_semantic_action<karma::strict_plus<Subject> >
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: unary_has_semantic_action<Subject> {};
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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::plus<Subject>, Attribute
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, Context, Iterator>
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: mpl::true_ {};
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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::strict_plus<Subject>, Attribute
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, Context, Iterator>
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: mpl::true_ {};
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}}}
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#endif
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