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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