/*=============================================================================
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Copyright (c) 2001-2014 Joel de Guzman
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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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==============================================================================*/
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#if !defined(BOOST_SPIRIT_X3_RULE_JAN_08_2012_0326PM)
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#define BOOST_SPIRIT_X3_RULE_JAN_08_2012_0326PM
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#include <boost/spirit/home/x3/nonterminal/detail/rule.hpp>
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#include <boost/type_traits/is_same.hpp>
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#include <boost/spirit/home/x3/support/context.hpp>
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#include <boost/preprocessor/variadic/to_seq.hpp>
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#include <boost/preprocessor/variadic/elem.hpp>
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#include <boost/preprocessor/seq/for_each.hpp>
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#include <type_traits>
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#if !defined(BOOST_SPIRIT_X3_NO_RTTI)
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#include <typeinfo>
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#endif
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namespace boost { namespace spirit { namespace x3
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{
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// default parse_rule implementation
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template <typename ID, typename Attribute, typename Iterator
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, typename Context, typename ActualAttribute>
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inline detail::default_parse_rule_result
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parse_rule(
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rule<ID, Attribute> /* rule_ */
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, Iterator& first, Iterator const& last
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, Context const& context, ActualAttribute& attr)
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{
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static_assert(!is_same<decltype(get<ID>(context)), unused_type>::value,
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"BOOST_SPIRIT_DEFINE undefined for this rule.");
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return get<ID>(context).parse(first, last, context, unused, attr);
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}
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template <typename ID, typename RHS, typename Attribute, bool force_attribute_>
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struct rule_definition : parser<rule_definition<ID, RHS, Attribute, force_attribute_>>
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{
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typedef rule_definition<ID, RHS, Attribute, force_attribute_> this_type;
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typedef ID id;
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typedef RHS rhs_type;
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typedef rule<ID, Attribute> lhs_type;
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typedef Attribute attribute_type;
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static bool const has_attribute =
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!is_same<Attribute, unused_type>::value;
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static bool const handles_container =
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traits::is_container<Attribute>::value;
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static bool const force_attribute =
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force_attribute_;
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constexpr rule_definition(RHS const& rhs, char const* name)
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: rhs(rhs), name(name) {}
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template <typename Iterator, typename Context, typename Attribute_>
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bool parse(Iterator& first, Iterator const& last
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, Context const& context, unused_type, Attribute_& attr) const
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{
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return detail::rule_parser<attribute_type, ID>
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::call_rule_definition(
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rhs, name, first, last
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, context
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, attr
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, mpl::bool_<force_attribute>());
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}
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RHS rhs;
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char const* name;
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};
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template <typename ID, typename Attribute, bool force_attribute_>
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struct rule : parser<rule<ID, Attribute>>
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{
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static_assert(!std::is_reference<Attribute>::value,
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"Reference qualifier on rule attribute type is meaningless");
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typedef ID id;
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typedef Attribute attribute_type;
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static bool const has_attribute =
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!std::is_same<std::remove_const_t<Attribute>, unused_type>::value;
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static bool const handles_container =
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traits::is_container<Attribute>::value;
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static bool const force_attribute = force_attribute_;
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#if !defined(BOOST_SPIRIT_X3_NO_RTTI)
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rule() : name(typeid(rule).name()) {}
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#else
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constexpr rule() : name("unnamed") {}
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#endif
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constexpr rule(char const* name)
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: name(name) {}
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constexpr rule(rule const& r)
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: name(r.name)
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{
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// Assert that we are not copying an unitialized static rule. If
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// the static is in another TU, it may be initialized after we copy
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// it. If so, its name member will be nullptr.
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BOOST_ASSERT_MSG(r.name, "uninitialized rule"); // static initialization order fiasco
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}
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template <typename RHS>
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constexpr rule_definition<
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ID, typename extension::as_parser<RHS>::value_type, Attribute, force_attribute_>
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operator=(RHS const& rhs) const
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{
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return { as_parser(rhs), name };
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}
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template <typename RHS>
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constexpr rule_definition<
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ID, typename extension::as_parser<RHS>::value_type, Attribute, true>
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operator%=(RHS const& rhs) const
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{
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return { as_parser(rhs), name };
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}
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template <typename Iterator, typename Context, typename Attribute_>
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bool parse(Iterator& first, Iterator const& last
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, Context const& context, unused_type, Attribute_& attr) const
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{
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static_assert(has_attribute,
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"The rule does not have an attribute. Check your parser.");
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using transform = traits::transform_attribute<
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Attribute_, attribute_type, parser_id>;
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using transform_attr = typename transform::type;
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transform_attr attr_ = transform::pre(attr);
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if (parse_rule(*this, first, last, context, attr_)) {
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transform::post(attr, std::forward<transform_attr>(attr_));
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return true;
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}
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return false;
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}
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template <typename Iterator, typename Context>
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bool parse(Iterator& first, Iterator const& last
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, Context const& context, unused_type, unused_type) const
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{
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// make sure we pass exactly the rule attribute type
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attribute_type no_attr{};
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return parse_rule(*this, first, last, context, no_attr);
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}
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char const* name;
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};
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namespace traits
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{
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template <typename T, typename Enable = void>
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struct is_rule : mpl::false_ {};
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template <typename ID, typename Attribute>
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struct is_rule<rule<ID, Attribute>> : mpl::true_ {};
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template <typename ID, typename Attribute, typename RHS, bool force_attribute>
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struct is_rule<rule_definition<ID, RHS, Attribute, force_attribute>> : mpl::true_ {};
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}
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template <typename T>
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struct get_info<T, typename enable_if<traits::is_rule<T>>::type>
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{
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typedef std::string result_type;
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std::string operator()(T const& r) const
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{
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BOOST_ASSERT_MSG(r.name, "uninitialized rule"); // static initialization order fiasco
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return r.name? r.name : "uninitialized";
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}
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};
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#define BOOST_SPIRIT_DECLARE_(r, data, rule_type) \
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template <typename Iterator, typename Context> \
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bool parse_rule( \
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rule_type rule_ \
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, Iterator& first, Iterator const& last \
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, Context const& context, rule_type::attribute_type& attr); \
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/***/
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#define BOOST_SPIRIT_DECLARE(...) BOOST_PP_SEQ_FOR_EACH( \
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BOOST_SPIRIT_DECLARE_, _, BOOST_PP_VARIADIC_TO_SEQ(__VA_ARGS__)) \
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/***/
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#if BOOST_WORKAROUND(BOOST_MSVC, < 1910)
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#define BOOST_SPIRIT_DEFINE_(r, data, rule_name) \
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using BOOST_PP_CAT(rule_name, _synonym) = decltype(rule_name); \
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template <typename Iterator, typename Context> \
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inline bool parse_rule( \
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BOOST_PP_CAT(rule_name, _synonym) /* rule_ */ \
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, Iterator& first, Iterator const& last \
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, Context const& context, BOOST_PP_CAT(rule_name, _synonym)::attribute_type& attr) \
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{ \
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using boost::spirit::x3::unused; \
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static auto const def_ = (rule_name = BOOST_PP_CAT(rule_name, _def)); \
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return def_.parse(first, last, context, unused, attr); \
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} \
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/***/
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#else
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#define BOOST_SPIRIT_DEFINE_(r, data, rule_name) \
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template <typename Iterator, typename Context> \
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inline bool parse_rule( \
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decltype(rule_name) /* rule_ */ \
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, Iterator& first, Iterator const& last \
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, Context const& context, decltype(rule_name)::attribute_type& attr) \
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{ \
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using boost::spirit::x3::unused; \
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static auto const def_ = (rule_name = BOOST_PP_CAT(rule_name, _def)); \
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return def_.parse(first, last, context, unused, attr); \
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} \
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/***/
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#endif
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#define BOOST_SPIRIT_DEFINE(...) BOOST_PP_SEQ_FOR_EACH( \
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BOOST_SPIRIT_DEFINE_, _, BOOST_PP_VARIADIC_TO_SEQ(__VA_ARGS__)) \
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/***/
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#define BOOST_SPIRIT_INSTANTIATE(rule_type, Iterator, Context) \
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template bool parse_rule<Iterator, Context>( \
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rule_type rule_ \
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, Iterator& first, Iterator const& last \
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, Context const& context, rule_type::attribute_type&); \
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/***/
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}}}
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#endif
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