1 /////////////////////////////////////////////////////////////////////////////// 2 /// \file as_expr.hpp 3 /// Contains definition of the as_expr\<\> and as_child\<\> helper class 4 /// templates used to implement proto::domain's as_expr\<\> and as_child\<\> 5 /// member templates. 6 // 7 // Copyright 2010 Eric Niebler. Distributed under the Boost 8 // Software License, Version 1.0. (See accompanying file 9 // LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) 10 11 #ifndef BOOST_PROTO_DETAIL_AS_EXPR_HPP_EAN_06_09_2010 12 #define BOOST_PROTO_DETAIL_AS_EXPR_HPP_EAN_06_09_2010 13 14 #include <boost/config.hpp> 15 #include <boost/detail/workaround.hpp> 16 #include <boost/type_traits/remove_const.hpp> 17 #include <boost/proto/proto_fwd.hpp> 18 #include <boost/proto/args.hpp> 19 20 #if defined(_MSC_VER) 21 # pragma warning(push) 22 # pragma warning(disable : 4714) // function 'xxx' marked as __forceinline not inlined 23 #endif 24 25 namespace boost { namespace proto { namespace detail 26 { 27 28 //////////////////////////////////////////////////////////////////////////////////////////////// 29 template<typename Generator> 30 struct base_generator 31 { 32 typedef Generator type; 33 }; 34 35 template<typename Generator> 36 struct base_generator<use_basic_expr<Generator> > 37 { 38 typedef Generator type; 39 }; 40 41 //////////////////////////////////////////////////////////////////////////////////////////////// 42 template<typename T, typename Generator, bool WantsBasicExpr> 43 struct as_expr; 44 45 //////////////////////////////////////////////////////////////////////////////////////////////// 46 template<typename T, typename Generator> 47 struct as_expr<T, Generator, false> 48 { 49 typedef typename term_traits<T &>::value_type value_type; 50 typedef proto::expr<proto::tag::terminal, term<value_type>, 0> expr_type; 51 typedef typename Generator::template result<Generator(expr_type)>::type result_type; 52 53 BOOST_FORCEINLINE operator ()boost::proto::detail::as_expr54 result_type operator()(T &t) const 55 { 56 return Generator()(expr_type::make(t)); 57 } 58 }; 59 60 //////////////////////////////////////////////////////////////////////////////////////////////// 61 template<typename T, typename Generator> 62 struct as_expr<T, Generator, true> 63 { 64 typedef typename term_traits<T &>::value_type value_type; 65 typedef proto::basic_expr<proto::tag::terminal, term<value_type>, 0> expr_type; 66 typedef typename Generator::template result<Generator(expr_type)>::type result_type; 67 68 BOOST_FORCEINLINE operator ()boost::proto::detail::as_expr69 result_type operator()(T &t) const 70 { 71 return Generator()(expr_type::make(t)); 72 } 73 }; 74 75 //////////////////////////////////////////////////////////////////////////////////////////////// 76 template<typename T> 77 struct as_expr<T, proto::default_generator, false> 78 { 79 typedef typename term_traits<T &>::value_type value_type; 80 typedef proto::expr<proto::tag::terminal, term<value_type>, 0> result_type; 81 82 BOOST_FORCEINLINE operator ()boost::proto::detail::as_expr83 result_type operator()(T &t) const 84 { 85 return result_type::make(t); 86 } 87 }; 88 89 //////////////////////////////////////////////////////////////////////////////////////////////// 90 template<typename T> 91 struct as_expr<T, proto::default_generator, true> 92 { 93 typedef typename term_traits<T &>::value_type value_type; 94 typedef proto::basic_expr<proto::tag::terminal, term<value_type>, 0> result_type; 95 96 BOOST_FORCEINLINE operator ()boost::proto::detail::as_expr97 result_type operator()(T &t) const 98 { 99 return result_type::make(t); 100 } 101 }; 102 103 //////////////////////////////////////////////////////////////////////////////////////////////// 104 template<typename T, typename Generator, bool WantsBasicExpr> 105 struct as_child; 106 107 //////////////////////////////////////////////////////////////////////////////////////////////// 108 template<typename T, typename Generator> 109 struct as_child<T, Generator, false> 110 { 111 #if BOOST_WORKAROUND(BOOST_MSVC, == 1310) 112 typedef typename term_traits<T &>::reference reference; 113 #else 114 typedef T &reference; 115 #endif 116 typedef proto::expr<proto::tag::terminal, term<reference>, 0> expr_type; 117 typedef typename Generator::template result<Generator(expr_type)>::type result_type; 118 119 BOOST_FORCEINLINE operator ()boost::proto::detail::as_child120 result_type operator()(T &t) const 121 { 122 return Generator()(expr_type::make(t)); 123 } 124 }; 125 126 //////////////////////////////////////////////////////////////////////////////////////////////// 127 template<typename T, typename Generator> 128 struct as_child<T, Generator, true> 129 { 130 #if BOOST_WORKAROUND(BOOST_MSVC, == 1310) 131 typedef typename term_traits<T &>::reference reference; 132 #else 133 typedef T &reference; 134 #endif 135 typedef proto::basic_expr<proto::tag::terminal, term<reference>, 0> expr_type; 136 typedef typename Generator::template result<Generator(expr_type)>::type result_type; 137 138 BOOST_FORCEINLINE operator ()boost::proto::detail::as_child139 result_type operator()(T &t) const 140 { 141 return Generator()(expr_type::make(t)); 142 } 143 }; 144 145 //////////////////////////////////////////////////////////////////////////////////////////////// 146 template<typename T> 147 struct as_child<T, proto::default_generator, false> 148 { 149 #if BOOST_WORKAROUND(BOOST_MSVC, == 1310) 150 typedef typename term_traits<T &>::reference reference; 151 #else 152 typedef T &reference; 153 #endif 154 typedef proto::expr<proto::tag::terminal, term<reference>, 0> result_type; 155 156 BOOST_FORCEINLINE operator ()boost::proto::detail::as_child157 result_type operator()(T &t) const 158 { 159 return result_type::make(t); 160 } 161 }; 162 163 //////////////////////////////////////////////////////////////////////////////////////////////// 164 template<typename T> 165 struct as_child<T, proto::default_generator, true> 166 { 167 #if BOOST_WORKAROUND(BOOST_MSVC, == 1310) 168 typedef typename term_traits<T &>::reference reference; 169 #else 170 typedef T &reference; 171 #endif 172 typedef proto::basic_expr<proto::tag::terminal, term<reference>, 0> result_type; 173 174 BOOST_FORCEINLINE operator ()boost::proto::detail::as_child175 result_type operator()(T &t) const 176 { 177 return result_type::make(t); 178 } 179 }; 180 181 }}} 182 183 #if defined(_MSC_VER) 184 # pragma warning(pop) 185 #endif 186 187 #endif 188