122 lines
3.6 KiB
C++
122 lines
3.6 KiB
C++
/*=============================================================================
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Copyright (c) 1998-2003 Joel de Guzman
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http://spirit.sourceforge.net/
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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_STORED_RULE_HPP)
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#define BOOST_SPIRIT_STORED_RULE_HPP
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///////////////////////////////////////////////////////////////////////////////
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#include <boost/spirit/home/classic/namespace.hpp>
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#include <boost/spirit/home/classic/core/non_terminal/impl/rule.ipp>
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#include <boost/spirit/home/classic/dynamic/rule_alias.hpp>
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#include <boost/shared_ptr.hpp>
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#include <boost/spirit/home/classic/dynamic/stored_rule_fwd.hpp>
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///////////////////////////////////////////////////////////////////////////////
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namespace boost { namespace spirit {
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BOOST_SPIRIT_CLASSIC_NAMESPACE_BEGIN
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///////////////////////////////////////////////////////////////////////////
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//
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// stored_rule class
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//
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///////////////////////////////////////////////////////////////////////////
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template <
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typename T0
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, typename T1
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, typename T2
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, bool EmbedByValue
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>
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class stored_rule
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: public impl::rule_base<
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stored_rule<T0, T1, T2, EmbedByValue>
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, typename mpl::if_c<
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EmbedByValue
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, stored_rule<T0, T1, T2, true>
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, stored_rule<T0, T1, T2> const&>::type
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, T0, T1, T2>
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{
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public:
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typedef stored_rule<T0, T1, T2, EmbedByValue> self_t;
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typedef impl::rule_base<
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self_t
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, typename mpl::if_c<
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EmbedByValue
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, stored_rule<T0, T1, T2, true>
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, self_t const&>::type
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, T0, T1, T2>
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base_t;
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typedef typename base_t::scanner_t scanner_t;
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typedef typename base_t::attr_t attr_t;
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typedef impl::abstract_parser<scanner_t, attr_t> abstract_parser_t;
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typedef rule_alias<self_t> alias_t;
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stored_rule() : ptr() {}
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~stored_rule() {}
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stored_rule(stored_rule const& r)
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: ptr(r.ptr) {}
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template <typename ParserT>
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stored_rule(ParserT const& p)
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: ptr(new impl::concrete_parser<ParserT, scanner_t, attr_t>(p)) {}
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template <typename ParserT>
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stored_rule& operator=(ParserT const& p)
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{
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ptr.reset(new impl::concrete_parser<ParserT, scanner_t, attr_t>(p));
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return *this;
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}
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stored_rule& operator=(stored_rule const& r)
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{
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// If this is placed above the templatized assignment
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// operator, VC6 incorrectly complains ambiguity with
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// r1 = r2, where r1 and r2 are both rules.
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ptr = r.ptr;
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return *this;
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}
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stored_rule<T0, T1, T2, true>
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copy() const
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{
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return stored_rule<T0, T1, T2, true>(ptr);
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}
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alias_t
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alias() const
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{
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return alias_t(*this);
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}
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private:
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friend class impl::rule_base_access;
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friend class stored_rule<T0, T1, T2, !EmbedByValue>;
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abstract_parser_t*
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get() const
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{
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return ptr.get();
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}
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stored_rule(shared_ptr<abstract_parser_t> const& ptr)
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: ptr(ptr) {}
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shared_ptr<abstract_parser_t> ptr;
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};
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///////////////////////////////////////////////////////////////////////////////
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BOOST_SPIRIT_CLASSIC_NAMESPACE_END
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}} // namespace BOOST_SPIRIT_CLASSIC_NS
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#endif
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