result_of_iterate.hpp 8.3 KB

123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221
  1. // Boost result_of library
  2. // Copyright Douglas Gregor 2004. Use, modification and
  3. // distribution is subject to the Boost Software License, Version
  4. // 1.0. (See accompanying file LICENSE_1_0.txt or copy at
  5. // http://www.boost.org/LICENSE_1_0.txt)
  6. // Copyright Daniel Walker, Eric Niebler, Michel Morin 2008-2012.
  7. // Use, modification and distribution is subject to the Boost Software
  8. // License, Version 1.0. (See accompanying file LICENSE_1_0.txt or
  9. // copy at http://www.boost.org/LICENSE_1_0.txt)
  10. // For more information, see http://www.boost.org/libs/utility
  11. #if !defined(BOOST_PP_IS_ITERATING)
  12. # error Boost result_of - do not include this file!
  13. #endif
  14. // CWPro8 requires an argument in a function type specialization
  15. #if BOOST_WORKAROUND(__MWERKS__, BOOST_TESTED_AT(0x3002)) && BOOST_PP_ITERATION() == 0
  16. # define BOOST_RESULT_OF_ARGS void
  17. #else
  18. # define BOOST_RESULT_OF_ARGS BOOST_PP_ENUM_PARAMS(BOOST_PP_ITERATION(),T)
  19. #endif
  20. #if !BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x551))
  21. template<typename F BOOST_PP_ENUM_TRAILING_PARAMS(BOOST_PP_ITERATION(),typename T)>
  22. struct tr1_result_of<F(BOOST_RESULT_OF_ARGS)>
  23. : mpl::if_<
  24. mpl::or_< is_pointer<F>, is_member_function_pointer<F> >
  25. , boost::detail::tr1_result_of_impl<
  26. typename remove_cv<F>::type,
  27. typename remove_cv<F>::type(BOOST_RESULT_OF_ARGS),
  28. (boost::detail::has_result_type<F>::value)>
  29. , boost::detail::tr1_result_of_impl<
  30. F,
  31. F(BOOST_RESULT_OF_ARGS),
  32. (boost::detail::has_result_type<F>::value)> >::type { };
  33. #endif
  34. #ifdef BOOST_RESULT_OF_USE_DECLTYPE
  35. template<typename F BOOST_PP_ENUM_TRAILING_PARAMS(BOOST_PP_ITERATION(),typename T)>
  36. struct result_of<F(BOOST_RESULT_OF_ARGS)>
  37. : detail::cpp0x_result_of<F(BOOST_RESULT_OF_ARGS)> { };
  38. #endif // BOOST_RESULT_OF_USE_DECLTYPE
  39. #ifdef BOOST_RESULT_OF_USE_TR1_WITH_DECLTYPE_FALLBACK
  40. template<typename F BOOST_PP_ENUM_TRAILING_PARAMS(BOOST_PP_ITERATION(),typename T)>
  41. struct result_of<F(BOOST_RESULT_OF_ARGS)>
  42. : mpl::if_<mpl::or_<detail::has_result_type<F>, detail::has_result<F> >,
  43. tr1_result_of<F(BOOST_RESULT_OF_ARGS)>,
  44. detail::cpp0x_result_of<F(BOOST_RESULT_OF_ARGS)> >::type { };
  45. #endif // BOOST_RESULT_OF_USE_TR1_WITH_DECLTYPE_FALLBACK
  46. #if defined(BOOST_RESULT_OF_USE_DECLTYPE) || defined(BOOST_RESULT_OF_USE_TR1_WITH_DECLTYPE_FALLBACK)
  47. namespace detail {
  48. template<typename F BOOST_PP_ENUM_TRAILING_PARAMS(BOOST_PP_ITERATION(),typename T)>
  49. struct cpp0x_result_of<F(BOOST_PP_ENUM_PARAMS(BOOST_PP_ITERATION(),T))>
  50. : mpl::if_<
  51. is_member_function_pointer<F>
  52. , detail::tr1_result_of_impl<
  53. typename remove_cv<F>::type,
  54. typename remove_cv<F>::type(BOOST_PP_ENUM_PARAMS(BOOST_PP_ITERATION(),T)), false
  55. >
  56. , detail::cpp0x_result_of_impl<
  57. F(BOOST_PP_ENUM_PARAMS(BOOST_PP_ITERATION(),T))
  58. >
  59. >::type
  60. {};
  61. #ifdef BOOST_NO_SFINAE_EXPR
  62. template<typename F>
  63. struct BOOST_PP_CAT(result_of_callable_fun_2_, BOOST_PP_ITERATION());
  64. template<typename R BOOST_PP_ENUM_TRAILING_PARAMS(BOOST_PP_ITERATION(), typename T)>
  65. struct BOOST_PP_CAT(result_of_callable_fun_2_, BOOST_PP_ITERATION())<R(BOOST_PP_ENUM_PARAMS(BOOST_PP_ITERATION(), T))> {
  66. R operator()(BOOST_PP_ENUM_PARAMS(BOOST_PP_ITERATION(), T)) const;
  67. typedef result_of_private_type const &(*pfn_t)(...);
  68. operator pfn_t() const volatile;
  69. };
  70. template<typename F>
  71. struct BOOST_PP_CAT(result_of_callable_fun_, BOOST_PP_ITERATION());
  72. template<typename F>
  73. struct BOOST_PP_CAT(result_of_callable_fun_, BOOST_PP_ITERATION())<F *>
  74. : BOOST_PP_CAT(result_of_callable_fun_2_, BOOST_PP_ITERATION())<F>
  75. {};
  76. template<typename F>
  77. struct BOOST_PP_CAT(result_of_callable_fun_, BOOST_PP_ITERATION())<F &>
  78. : BOOST_PP_CAT(result_of_callable_fun_2_, BOOST_PP_ITERATION())<F>
  79. {};
  80. template<typename F>
  81. struct BOOST_PP_CAT(result_of_select_call_wrapper_type_, BOOST_PP_ITERATION())
  82. : mpl::eval_if<
  83. is_class<typename remove_reference<F>::type>,
  84. result_of_wrap_callable_class<F>,
  85. mpl::identity<BOOST_PP_CAT(result_of_callable_fun_, BOOST_PP_ITERATION())<typename remove_cv<F>::type> >
  86. >
  87. {};
  88. template<typename F BOOST_PP_ENUM_TRAILING_PARAMS(BOOST_PP_ITERATION(), typename T)>
  89. struct BOOST_PP_CAT(result_of_is_callable_, BOOST_PP_ITERATION()) {
  90. typedef typename BOOST_PP_CAT(result_of_select_call_wrapper_type_, BOOST_PP_ITERATION())<F>::type wrapper_t;
  91. static const bool value = (
  92. sizeof(result_of_no_type) == sizeof(detail::result_of_is_private_type(
  93. (boost::declval<wrapper_t>()(BOOST_PP_ENUM_BINARY_PARAMS(BOOST_PP_ITERATION(), boost::declval<T, >() BOOST_PP_INTERCEPT)), result_of_weird_type())
  94. ))
  95. );
  96. typedef mpl::bool_<value> type;
  97. };
  98. template<typename F BOOST_PP_ENUM_TRAILING_PARAMS(BOOST_PP_ITERATION(),typename T)>
  99. struct cpp0x_result_of_impl<F(BOOST_PP_ENUM_PARAMS(BOOST_PP_ITERATION(),T)), true>
  100. : lazy_enable_if<
  101. BOOST_PP_CAT(result_of_is_callable_, BOOST_PP_ITERATION())<F BOOST_PP_ENUM_TRAILING_PARAMS(BOOST_PP_ITERATION(), T)>
  102. , cpp0x_result_of_impl<F(BOOST_PP_ENUM_PARAMS(BOOST_PP_ITERATION(),T)), false>
  103. >
  104. {};
  105. template<typename F BOOST_PP_ENUM_TRAILING_PARAMS(BOOST_PP_ITERATION(),typename T)>
  106. struct cpp0x_result_of_impl<F(BOOST_PP_ENUM_PARAMS(BOOST_PP_ITERATION(),T)), false>
  107. {
  108. typedef decltype(
  109. boost::declval<F>()(
  110. BOOST_PP_ENUM_BINARY_PARAMS(BOOST_PP_ITERATION(), boost::declval<T, >() BOOST_PP_INTERCEPT)
  111. )
  112. ) type;
  113. };
  114. #else // BOOST_NO_SFINAE_EXPR
  115. template<typename F BOOST_PP_ENUM_TRAILING_PARAMS(BOOST_PP_ITERATION(),typename T)>
  116. struct cpp0x_result_of_impl<F(BOOST_PP_ENUM_PARAMS(BOOST_PP_ITERATION(),T)),
  117. typename result_of_always_void<decltype(
  118. boost::declval<F>()(
  119. BOOST_PP_ENUM_BINARY_PARAMS(BOOST_PP_ITERATION(), boost::declval<T, >() BOOST_PP_INTERCEPT)
  120. )
  121. )>::type> {
  122. typedef decltype(
  123. boost::declval<F>()(
  124. BOOST_PP_ENUM_BINARY_PARAMS(BOOST_PP_ITERATION(), boost::declval<T, >() BOOST_PP_INTERCEPT)
  125. )
  126. ) type;
  127. };
  128. #endif // BOOST_NO_SFINAE_EXPR
  129. } // namespace detail
  130. #else // defined(BOOST_RESULT_OF_USE_DECLTYPE) || defined(BOOST_RESULT_OF_USE_TR1_WITH_DECLTYPE_FALLBACK)
  131. #if !BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x551))
  132. template<typename F BOOST_PP_ENUM_TRAILING_PARAMS(BOOST_PP_ITERATION(),typename T)>
  133. struct result_of<F(BOOST_RESULT_OF_ARGS)>
  134. : tr1_result_of<F(BOOST_RESULT_OF_ARGS)> { };
  135. #endif
  136. #endif // defined(BOOST_RESULT_OF_USE_DECLTYPE)
  137. #undef BOOST_RESULT_OF_ARGS
  138. #if BOOST_PP_ITERATION() >= 1
  139. namespace detail {
  140. template<typename R, typename FArgs BOOST_PP_ENUM_TRAILING_PARAMS(BOOST_PP_ITERATION(),typename T)>
  141. struct tr1_result_of_impl<R (*)(BOOST_PP_ENUM_PARAMS(BOOST_PP_ITERATION(),T)), FArgs, false>
  142. {
  143. typedef R type;
  144. };
  145. template<typename R, typename FArgs BOOST_PP_ENUM_TRAILING_PARAMS(BOOST_PP_ITERATION(),typename T)>
  146. struct tr1_result_of_impl<R (&)(BOOST_PP_ENUM_PARAMS(BOOST_PP_ITERATION(),T)), FArgs, false>
  147. {
  148. typedef R type;
  149. };
  150. #if !BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x551))
  151. template<typename R, typename FArgs BOOST_PP_ENUM_TRAILING_PARAMS(BOOST_PP_ITERATION(),typename T)>
  152. struct tr1_result_of_impl<R (T0::*)
  153. (BOOST_PP_ENUM_SHIFTED_PARAMS(BOOST_PP_ITERATION(),T)),
  154. FArgs, false>
  155. {
  156. typedef R type;
  157. };
  158. template<typename R, typename FArgs BOOST_PP_ENUM_TRAILING_PARAMS(BOOST_PP_ITERATION(),typename T)>
  159. struct tr1_result_of_impl<R (T0::*)
  160. (BOOST_PP_ENUM_SHIFTED_PARAMS(BOOST_PP_ITERATION(),T))
  161. const,
  162. FArgs, false>
  163. {
  164. typedef R type;
  165. };
  166. template<typename R, typename FArgs BOOST_PP_ENUM_TRAILING_PARAMS(BOOST_PP_ITERATION(),typename T)>
  167. struct tr1_result_of_impl<R (T0::*)
  168. (BOOST_PP_ENUM_SHIFTED_PARAMS(BOOST_PP_ITERATION(),T))
  169. volatile,
  170. FArgs, false>
  171. {
  172. typedef R type;
  173. };
  174. template<typename R, typename FArgs BOOST_PP_ENUM_TRAILING_PARAMS(BOOST_PP_ITERATION(),typename T)>
  175. struct tr1_result_of_impl<R (T0::*)
  176. (BOOST_PP_ENUM_SHIFTED_PARAMS(BOOST_PP_ITERATION(),T))
  177. const volatile,
  178. FArgs, false>
  179. {
  180. typedef R type;
  181. };
  182. #endif
  183. }
  184. #endif