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  1.  
  2. #if !defined(BOOST_PP_IS_ITERATING)
  3.  
  4. ///// header body
  5.  
  6. #ifndef BOOST_MPL_AUX_TEMPLATE_ARITY_HPP_INCLUDED
  7. #define BOOST_MPL_AUX_TEMPLATE_ARITY_HPP_INCLUDED
  8.  
  9. // Copyright Aleksey Gurtovoy 2001-2004
  10. //
  11. // Distributed under the Boost Software License, Version 1.0.
  12. // (See accompanying file LICENSE_1_0.txt or copy at
  13. // http://www.boost.org/LICENSE_1_0.txt)
  14. //
  15. // See http://www.boost.org/libs/mpl for documentation.
  16.  
  17. // $Id$
  18. // $Date$
  19. // $Revision$
  20.  
  21. #include <boost/mpl/aux_/config/ttp.hpp>
  22. #include <boost/mpl/aux_/config/lambda.hpp>
  23.  
  24. #if !defined(BOOST_MPL_PREPROCESSING_MODE)
  25. #   include <boost/mpl/aux_/template_arity_fwd.hpp>
  26. #   include <boost/mpl/int.hpp>
  27. #   if !defined(BOOST_MPL_CFG_NO_FULL_LAMBDA_SUPPORT)
  28. #   if defined(BOOST_MPL_CFG_EXTENDED_TEMPLATE_PARAMETERS_MATCHING)
  29. #       include <boost/mpl/aux_/type_wrapper.hpp>
  30. #   endif
  31. #   else
  32. #       include <boost/mpl/aux_/has_rebind.hpp>
  33. #   endif
  34. #endif
  35.  
  36. #include <boost/mpl/aux_/config/static_constant.hpp>
  37. #include <boost/mpl/aux_/config/use_preprocessed.hpp>
  38.  
  39. #if !defined(BOOST_MPL_CFG_NO_PREPROCESSED_HEADERS) \
  40.     && !defined(BOOST_MPL_PREPROCESSING_MODE)
  41.  
  42. #   define BOOST_MPL_PREPROCESSED_HEADER template_arity.hpp
  43. #   include <boost/mpl/aux_/include_preprocessed.hpp>
  44.  
  45. #else
  46.  
  47. #   if !defined(BOOST_MPL_CFG_NO_FULL_LAMBDA_SUPPORT)
  48. #   if defined(BOOST_MPL_CFG_EXTENDED_TEMPLATE_PARAMETERS_MATCHING)
  49.  
  50. #   include <boost/mpl/limits/arity.hpp>
  51. #   include <boost/mpl/aux_/preprocessor/range.hpp>
  52. #   include <boost/mpl/aux_/preprocessor/repeat.hpp>
  53. #   include <boost/mpl/aux_/preprocessor/params.hpp>
  54. #   include <boost/mpl/aux_/nttp_decl.hpp>
  55.  
  56. #   include <boost/preprocessor/seq/fold_left.hpp>
  57. #   include <boost/preprocessor/comma_if.hpp>
  58. #   include <boost/preprocessor/iterate.hpp>
  59. #   include <boost/preprocessor/inc.hpp>
  60. #   include <boost/preprocessor/cat.hpp>
  61.  
  62. #   define AUX778076_ARITY BOOST_PP_INC(BOOST_MPL_LIMIT_METAFUNCTION_ARITY)
  63.  
  64. namespace mars_boost {} namespace boost = mars_boost; namespace mars_boost { namespace mpl { namespace aux {
  65.  
  66. template< BOOST_MPL_AUX_NTTP_DECL(int, N) > struct arity_tag
  67. {
  68.     typedef char (&type)[N + 1];
  69. };
  70.  
  71. #   define AUX778076_MAX_ARITY_OP(unused, state, i_) \
  72.     ( BOOST_PP_CAT(C,i_) > 0 ? BOOST_PP_CAT(C,i_) : state ) \
  73. /**/
  74.  
  75. template<
  76.       BOOST_MPL_PP_PARAMS(AUX778076_ARITY, BOOST_MPL_AUX_NTTP_DECL(int, C))
  77.     >
  78. struct max_arity
  79. {
  80.     BOOST_STATIC_CONSTANT(int, value =
  81.           BOOST_PP_SEQ_FOLD_LEFT(
  82.               AUX778076_MAX_ARITY_OP
  83.             , -1
  84.             , BOOST_MPL_PP_RANGE(1, AUX778076_ARITY)
  85.             )
  86.         );
  87. };
  88.  
  89. #   undef AUX778076_MAX_ARITY_OP
  90.  
  91. arity_tag<0>::type arity_helper(...);
  92.  
  93. #   define BOOST_PP_ITERATION_LIMITS (1, AUX778076_ARITY)
  94. #   define BOOST_PP_FILENAME_1 <boost/mpl/aux_/template_arity.hpp>
  95. #   include BOOST_PP_ITERATE()
  96.  
  97. template< typename F, BOOST_MPL_AUX_NTTP_DECL(int, N) >
  98. struct template_arity_impl
  99. {
  100.     BOOST_STATIC_CONSTANT(int, value =
  101.           sizeof(::mars_boost::mpl::aux::arity_helper(type_wrapper<F>(),arity_tag<N>())) - 1
  102.         );
  103. };
  104.  
  105. #   define AUX778076_TEMPLATE_ARITY_IMPL_INVOCATION(unused, i_, F) \
  106.     BOOST_PP_COMMA_IF(i_) template_arity_impl<F,BOOST_PP_INC(i_)>::value \
  107. /**/
  108.  
  109. template< typename F >
  110. struct template_arity
  111. {
  112.     BOOST_STATIC_CONSTANT(int, value = (
  113.           max_arity< BOOST_MPL_PP_REPEAT(
  114.               AUX778076_ARITY
  115.             , AUX778076_TEMPLATE_ARITY_IMPL_INVOCATION
  116.             , F
  117.             ) >::value
  118.         ));
  119.        
  120.     typedef mpl::int_<value> type;
  121. };
  122.  
  123. #   undef AUX778076_TEMPLATE_ARITY_IMPL_INVOCATION
  124.  
  125. #   undef AUX778076_ARITY
  126.  
  127. }}}
  128.  
  129. #   endif // BOOST_MPL_CFG_EXTENDED_TEMPLATE_PARAMETERS_MATCHING
  130. #   else // BOOST_MPL_CFG_NO_FULL_LAMBDA_SUPPORT
  131.  
  132. #   include <boost/mpl/aux_/config/eti.hpp>
  133.  
  134. namespace mars_boost {} namespace boost = mars_boost; namespace mars_boost { namespace mpl { namespace aux {
  135.  
  136. template< bool >
  137. struct template_arity_impl
  138. {
  139.     template< typename F > struct result_
  140.         : mpl::int_<-1>
  141.     {
  142.     };
  143. };
  144.  
  145. template<>
  146. struct template_arity_impl<true>
  147. {
  148.     template< typename F > struct result_
  149.         : F::arity
  150.     {
  151.     };
  152. };
  153.  
  154. template< typename F >
  155. struct template_arity
  156.     : template_arity_impl< ::mars_boost::mpl::aux::has_rebind<F>::value >
  157.         ::template result_<F>
  158. {
  159. };
  160.  
  161. #if defined(BOOST_MPL_CFG_MSVC_ETI_BUG)
  162. template<>
  163. struct template_arity<int>
  164.     : mpl::int_<-1>
  165. {
  166. };
  167. #endif
  168.  
  169. }}}
  170.  
  171. #   endif // BOOST_MPL_CFG_NO_FULL_LAMBDA_SUPPORT
  172.  
  173. #endif // BOOST_MPL_CFG_NO_PREPROCESSED_HEADERS
  174. #endif // BOOST_MPL_AUX_TEMPLATE_ARITY_HPP_INCLUDED
  175.  
  176. ///// iteration
  177.  
  178. #else
  179. #define i_ BOOST_PP_FRAME_ITERATION(1)
  180.  
  181. template<
  182.       template< BOOST_MPL_PP_PARAMS(i_, typename P) > class F
  183.     , BOOST_MPL_PP_PARAMS(i_, typename T)
  184.     >
  185. typename arity_tag<i_>::type
  186. arity_helper(type_wrapper< F<BOOST_MPL_PP_PARAMS(i_, T)> >, arity_tag<i_>);
  187.  
  188. #undef i_
  189. #endif // BOOST_PP_IS_ITERATING
  190.  
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