boost/mpl/aux_/count_args.hpp

   1
   2 // NO INCLUDE GUARDS, THE HEADER IS INTENDED FOR MULTIPLE INCLUSION
   3
   4 // Copyright Aleksey Gurtovoy 2000-2004
   5 //
   6 // Distributed under the Boost Software License, Version 1.0.
   7 // (See accompanying file LICENSE_1_0.txt or copy at
   8 // http://www.boost.org/LICENSE_1_0.txt)
   9 //
  10 // See http://www.boost.org/libs/mpl for documentation.
  11
  12 // $Id: count_args.hpp 49267 2008-10-11 06:19:02Z agurtovoy $
  13 // $Date: 2008-10-11 02:19:02 -0400 (Sat, 11 Oct 2008) $
  14 // $Revision: 49267 $
  15
  16 #include <boost/preprocessor/expr_if.hpp>
  17 #include <boost/preprocessor/inc.hpp>
  18 #include <boost/preprocessor/cat.hpp>
  19
  20 #if !defined(AUX778076_COUNT_ARGS_PARAM_NAME)
  21 #   define AUX778076_COUNT_ARGS_PARAM_NAME T
  22 #endif
  23
  24 #if !defined(AUX778076_COUNT_ARGS_TEMPLATE_PARAM)
  25 #   define AUX778076_COUNT_ARGS_TEMPLATE_PARAM typename AUX778076_COUNT_ARGS_PARAM_NAME
  26 #endif
  27
  28 // local macros, #undef-ined at the end of the header
  29
  30 #if !defined(AUX778076_COUNT_ARGS_USE_STANDARD_PP_PRIMITIVES)
  31
  32 #   include <boost/mpl/aux_/preprocessor/repeat.hpp>
  33 #   include <boost/mpl/aux_/preprocessor/params.hpp>
  34
  35 #   define AUX778076_COUNT_ARGS_REPEAT BOOST_MPL_PP_REPEAT
  36 #   define AUX778076_COUNT_ARGS_PARAMS(param) \
  37     BOOST_MPL_PP_PARAMS( \
  38           AUX778076_COUNT_ARGS_ARITY \
  39         , param \
  40         ) \
  41     /**/
  42
  43 #else
  44
  45 #   include <boost/preprocessor/enum_shifted_params.hpp>
  46 #   include <boost/preprocessor/repeat.hpp>
  47 #   include <boost/preprocessor/inc.hpp>
  48
  49 #   define AUX778076_COUNT_ARGS_REPEAT BOOST_PP_REPEAT
  50 #   define AUX778076_COUNT_ARGS_PARAMS(param) \
  51     BOOST_PP_ENUM_SHIFTED_PARAMS( \
  52           BOOST_PP_INC(AUX778076_COUNT_ARGS_ARITY) \
  53         , param \
  54         ) \
  55     /**/
  56
  57 #endif // AUX778076_COUNT_ARGS_USE_STANDARD_PP_PRIMITIVES
  58
  59
  60 #define AUX778076_IS_ARG_TEMPLATE_NAME \
  61     BOOST_PP_CAT(is_,BOOST_PP_CAT(AUX778076_COUNT_ARGS_PREFIX,_arg)) \
  62 /**/
  63
  64 #define AUX778076_COUNT_ARGS_FUNC(unused, i, param) \
  65     BOOST_PP_EXPR_IF(i, +) \
  66     AUX778076_IS_ARG_TEMPLATE_NAME<BOOST_PP_CAT(param,BOOST_PP_INC(i))>::value \
  67 /**/
  68
  69 // is_<xxx>_arg
  70 template< AUX778076_COUNT_ARGS_TEMPLATE_PARAM >
  71 struct AUX778076_IS_ARG_TEMPLATE_NAME
  72 {
  73     BOOST_STATIC_CONSTANT(bool, value = true);
  74 };
  75
  76 template<>
  77 struct AUX778076_IS_ARG_TEMPLATE_NAME<AUX778076_COUNT_ARGS_DEFAULT>
  78 {
  79     BOOST_STATIC_CONSTANT(bool, value = false);
  80 };
  81
  82 // <xxx>_count_args
  83 template<
  84       AUX778076_COUNT_ARGS_PARAMS(AUX778076_COUNT_ARGS_TEMPLATE_PARAM)
  85     >
  86 struct BOOST_PP_CAT(AUX778076_COUNT_ARGS_PREFIX,_count_args)
  87 {
  88     BOOST_STATIC_CONSTANT(int, value = AUX778076_COUNT_ARGS_REPEAT(
  89           AUX778076_COUNT_ARGS_ARITY
  90         , AUX778076_COUNT_ARGS_FUNC
  91         , AUX778076_COUNT_ARGS_PARAM_NAME
  92         ));
  93 };
  94
  95 #undef AUX778076_COUNT_ARGS_FUNC
  96 #undef AUX778076_IS_ARG_TEMPLATE_NAME
  97 #undef AUX778076_COUNT_ARGS_PARAMS
  98 #undef AUX778076_COUNT_ARGS_REPEAT
  99
 100 #undef AUX778076_COUNT_ARGS_ARITY
 101 #undef AUX778076_COUNT_ARGS_DEFAULT
 102 #undef AUX778076_COUNT_ARGS_PREFIX
 103 #undef AUX778076_COUNT_ARGS_USE_STANDARD_PP_PRIMITIVES
 104 #undef AUX778076_COUNT_ARGS_TEMPLATE_PARAM
 105 #undef AUX778076_COUNT_ARGS_PARAM_NAME