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- /*=============================================================================
- Copyright (c) 1998-2003 Joel de Guzman
- http://spirit.sourceforge.net/
- Distributed under the Boost Software License, Version 1.0. (See accompanying
- file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
- =============================================================================*/
- #if !defined(BOOST_SPIRIT_STORED_RULE_HPP)
- #define BOOST_SPIRIT_STORED_RULE_HPP
- ///////////////////////////////////////////////////////////////////////////////
- #include <boost/spirit/home/classic/namespace.hpp>
- #include <boost/spirit/home/classic/core/non_terminal/impl/rule.ipp>
- #include <boost/spirit/home/classic/dynamic/rule_alias.hpp>
- #include <boost/shared_ptr.hpp>
- #include <boost/spirit/home/classic/dynamic/stored_rule_fwd.hpp>
- ///////////////////////////////////////////////////////////////////////////////
- namespace boost { namespace spirit {
- BOOST_SPIRIT_CLASSIC_NAMESPACE_BEGIN
- ///////////////////////////////////////////////////////////////////////////
- //
- // stored_rule class
- //
- ///////////////////////////////////////////////////////////////////////////
- template <
- typename T0
- , typename T1
- , typename T2
- , bool EmbedByValue
- >
- class stored_rule
- : public impl::rule_base<
- stored_rule<T0, T1, T2, EmbedByValue>
- , typename mpl::if_c<
- EmbedByValue
- , stored_rule<T0, T1, T2, true>
- , stored_rule<T0, T1, T2> const&>::type
- , T0, T1, T2>
- {
- public:
- typedef stored_rule<T0, T1, T2, EmbedByValue> self_t;
- typedef impl::rule_base<
- self_t
- , typename mpl::if_c<
- EmbedByValue
- , stored_rule<T0, T1, T2, true>
- , self_t const&>::type
- , T0, T1, T2>
- base_t;
- typedef typename base_t::scanner_t scanner_t;
- typedef typename base_t::attr_t attr_t;
- typedef impl::abstract_parser<scanner_t, attr_t> abstract_parser_t;
- typedef rule_alias<self_t> alias_t;
- stored_rule() : ptr() {}
- ~stored_rule() {}
- stored_rule(stored_rule const& r)
- : ptr(r.ptr) {}
- template <typename ParserT>
- stored_rule(ParserT const& p)
- : ptr(new impl::concrete_parser<ParserT, scanner_t, attr_t>(p)) {}
- template <typename ParserT>
- stored_rule& operator=(ParserT const& p)
- {
- ptr.reset(new impl::concrete_parser<ParserT, scanner_t, attr_t>(p));
- return *this;
- }
- stored_rule& operator=(stored_rule const& r)
- {
- // If this is placed above the templatized assignment
- // operator, VC6 incorrectly complains ambiguity with
- // r1 = r2, where r1 and r2 are both rules.
- ptr = r.ptr;
- return *this;
- }
- stored_rule<T0, T1, T2, true>
- copy() const
- {
- return stored_rule<T0, T1, T2, true>(ptr);
- }
- alias_t
- alias() const
- {
- return alias_t(*this);
- }
- private:
- friend class impl::rule_base_access;
- friend class stored_rule<T0, T1, T2, !EmbedByValue>;
- abstract_parser_t*
- get() const
- {
- return ptr.get();
- }
- stored_rule(shared_ptr<abstract_parser_t> const& ptr)
- : ptr(ptr) {}
- shared_ptr<abstract_parser_t> ptr;
- };
- ///////////////////////////////////////////////////////////////////////////////
- BOOST_SPIRIT_CLASSIC_NAMESPACE_END
- }} // namespace BOOST_SPIRIT_CLASSIC_NS
- #endif
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