[857] | 1 | /*=============================================================================
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| 2 | Copyright (c) 1998-2003 Joel de Guzman
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| 3 | http://spirit.sourceforge.net/
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| 4 |
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| 5 | Use, modification and distribution is subject to the Boost Software
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| 6 | License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
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| 7 | http://www.boost.org/LICENSE_1_0.txt)
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| 8 | =============================================================================*/
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| 9 | #if !defined(BOOST_SPIRIT_STORED_RULE_HPP)
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| 10 | #define BOOST_SPIRIT_STORED_RULE_HPP
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| 11 |
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| 12 | ///////////////////////////////////////////////////////////////////////////////
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| 13 | #include <boost/spirit/core/non_terminal/impl/rule.ipp>
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| 14 | #include <boost/spirit/dynamic/rule_alias.hpp>
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| 15 | #include <boost/shared_ptr.hpp>
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| 16 |
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| 17 | ///////////////////////////////////////////////////////////////////////////////
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| 18 | namespace boost { namespace spirit {
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| 19 |
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| 20 | ///////////////////////////////////////////////////////////////////////////
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| 21 | //
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| 22 | // stored_rule class
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| 23 | //
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| 24 | ///////////////////////////////////////////////////////////////////////////
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| 25 | template <
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| 26 | typename T0 = nil_t
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| 27 | , typename T1 = nil_t
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| 28 | , typename T2 = nil_t
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| 29 | , bool EmbedByValue = false
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| 30 | >
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| 31 | class stored_rule
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| 32 | : public impl::rule_base<
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| 33 | stored_rule<T0, T1, T2, EmbedByValue>
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| 34 | , typename mpl::if_c<
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| 35 | EmbedByValue
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| 36 | , stored_rule<T0, T1, T2, true>
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| 37 | , stored_rule<T0, T1, T2> const&>::type
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| 38 | , T0, T1, T2>
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| 39 | {
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| 40 | public:
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| 41 |
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| 42 | typedef stored_rule<T0, T1, T2, EmbedByValue> self_t;
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| 43 | typedef impl::rule_base<
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| 44 | self_t
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| 45 | , typename mpl::if_c<
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| 46 | EmbedByValue
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| 47 | , stored_rule<T0, T1, T2, true>
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| 48 | , self_t const&>::type
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| 49 | , T0, T1, T2>
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| 50 | base_t;
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| 51 |
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| 52 | typedef typename base_t::scanner_t scanner_t;
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| 53 | typedef typename base_t::attr_t attr_t;
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| 54 | typedef impl::abstract_parser<scanner_t, attr_t> abstract_parser_t;
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| 55 | typedef rule_alias<self_t> alias_t;
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| 56 |
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| 57 | stored_rule() : ptr() {}
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| 58 | ~stored_rule() {}
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| 59 |
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| 60 | stored_rule(stored_rule const& r)
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| 61 | : ptr(r.ptr) {}
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| 62 |
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| 63 | template <typename ParserT>
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| 64 | stored_rule(ParserT const& p)
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| 65 | : ptr(new impl::concrete_parser<ParserT, scanner_t, attr_t>(p)) {}
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| 66 |
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| 67 | template <typename ParserT>
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| 68 | stored_rule& operator=(ParserT const& p)
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| 69 | {
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| 70 | ptr.reset(new impl::concrete_parser<ParserT, scanner_t, attr_t>(p));
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| 71 | return *this;
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| 72 | }
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| 73 |
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| 74 | stored_rule& operator=(stored_rule const& r)
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| 75 | {
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| 76 | // If this is placed above the templatized assignment
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| 77 | // operator, VC6 incorrectly complains ambiguity with
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| 78 | // r1 = r2, where r1 and r2 are both rules.
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| 79 | ptr = r.ptr;
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| 80 | return *this;
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| 81 | }
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| 82 |
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| 83 | stored_rule<T0, T1, T2, true>
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| 84 | copy() const
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| 85 | {
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| 86 | return stored_rule<T0, T1, T2, true>(ptr);
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| 87 | }
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| 88 |
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| 89 | alias_t
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| 90 | alias() const
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| 91 | {
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| 92 | return alias_t(*this);
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| 93 | }
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| 94 |
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| 95 | private:
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| 96 |
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| 97 | friend class impl::rule_base_access;
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| 98 | friend class stored_rule<T0, T1, T2, !EmbedByValue>;
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| 99 |
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| 100 | #if defined(__GNUC__) && (__GNUC__ < 3)
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| 101 | public:
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| 102 | #endif
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| 103 | abstract_parser_t*
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| 104 | get() const
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| 105 | {
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| 106 | return ptr.get();
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| 107 | }
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| 108 | #if defined(__GNUC__) && (__GNUC__ < 3)
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| 109 | private:
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| 110 | #endif
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| 111 |
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| 112 | stored_rule(shared_ptr<abstract_parser_t> const& ptr)
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| 113 | : ptr(ptr) {}
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| 114 |
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| 115 | shared_ptr<abstract_parser_t> ptr;
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| 116 | };
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| 117 |
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| 118 | ///////////////////////////////////////////////////////////////////////////////
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| 119 | }} // namespace boost::spirit
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| 120 |
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| 121 | #endif
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