3rdparty/boost/boost/parameter/macros.hpp

   1 // Copyright David Abrahams, Daniel Wallin 2003. Use, modification and
   2 // distribution is subject to the Boost Software License, Version 1.0.
   3 // (See accompanying file LICENSE_1_0.txt or copy at
   4 // http://www.boost.org/LICENSE_1_0.txt)
   5
   6 #ifndef BOOST_PARAMETER_MACROS_050412_HPP
   7 #define BOOST_PARAMETER_MACROS_050412_HPP
   8
   9 #include <boost/preprocessor/tuple/elem.hpp>
  10 #include <boost/preprocessor/repetition/repeat_from_to.hpp>
  11 #include <boost/preprocessor/arithmetic/inc.hpp>
  12 #include <boost/preprocessor/logical/bool.hpp>
  13 #include <boost/preprocessor/punctuation/comma_if.hpp>
  14 #include <boost/preprocessor/control/expr_if.hpp>
  15 #include <boost/preprocessor/repetition/enum_params.hpp>
  16 #include <boost/preprocessor/repetition/enum_binary_params.hpp>
  17 #include <boost/preprocessor/cat.hpp>
  18 #include <boost/detail/workaround.hpp>
  19
  20 #define BOOST_PARAMETER_FUN_TEMPLATE_HEAD1(n) \
  21     template<BOOST_PP_ENUM_PARAMS(n, class T)>
  22
  23 #define BOOST_PARAMETER_FUN_TEMPLATE_HEAD0(n)
  24
  25 #if ! defined(BOOST_NO_SFINAE) && ! BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x592))
  26
  27 # define BOOST_PARAMETER_MATCH_TYPE(n, param)           \
  28             BOOST_PP_EXPR_IF(n, typename) param::match  \
  29             <                                           \
  30                 BOOST_PP_ENUM_PARAMS(n, T)              \
  31             >::type
  32
  33 #else
  34
  35 # define BOOST_PARAMETER_MATCH_TYPE(n, param) param
  36
  37 #endif
  38
  39 #define BOOST_PARAMETER_FUN_DECL(z, n, params)                                      \
  40                                                                                     \
  41     BOOST_PP_CAT(BOOST_PARAMETER_FUN_TEMPLATE_HEAD, BOOST_PP_BOOL(n))(n)            \
  42                                                                                     \
  43     BOOST_PP_TUPLE_ELEM(3, 0, params)                                               \
  44         BOOST_PP_TUPLE_ELEM(3, 1, params)(                                          \
  45             BOOST_PP_ENUM_BINARY_PARAMS(n, T, const& p)                             \
  46             BOOST_PP_COMMA_IF(n)                                                    \
  47             BOOST_PARAMETER_MATCH_TYPE(n,BOOST_PP_TUPLE_ELEM(3, 2, params))         \
  48             kw = BOOST_PP_TUPLE_ELEM(3, 2, params)()                                \
  49         )                                                                           \
  50     {                                                                               \
  51         return BOOST_PP_CAT(BOOST_PP_TUPLE_ELEM(3, 1, params), _with_named_params)( \
  52             kw(BOOST_PP_ENUM_PARAMS(n, p))                                          \
  53         );                                                                          \
  54     }
  55
  56 // Generates:
  57 //
  58 // template<class Params>
  59 // ret name ## _with_named_params(Params const&);
  60 //
  61 // template<class T0>
  62 // ret name(T0 const& p0, typename parameters::match<T0>::type kw = parameters())
  63 // {
  64 //     return name ## _with_named_params(kw(p0));
  65 // }
  66 //
  67 // template<class T0, ..., class TN>
  68 // ret name(T0 const& p0, ..., TN const& PN
  69 //    , typename parameters::match<T0, ..., TN>::type kw = parameters())
  70 // {
  71 //     return name ## _with_named_params(kw(p0, ..., pN));
  72 // }
  73 //
  74 // template<class Params>
  75 // ret name ## _with_named_params(Params const&)
  76 //
  77 // lo and hi determines the min and max arity of the generated functions.
  78
  79 #define BOOST_PARAMETER_FUN(ret, name, lo, hi, parameters)                          \
  80                                                                                     \
  81     template<class Params>                                                          \
  82     ret BOOST_PP_CAT(name, _with_named_params)(Params const& p);                    \
  83                                                                                     \
  84     BOOST_PP_REPEAT_FROM_TO(                                                        \
  85         lo, BOOST_PP_INC(hi), BOOST_PARAMETER_FUN_DECL, (ret, name, parameters))    \
  86                                                                                     \
  87     template<class Params>                                                          \
  88     ret BOOST_PP_CAT(name, _with_named_params)(Params const& p)
  89
  90 #define BOOST_PARAMETER_MEMFUN(ret, name, lo, hi, parameters)                       \
  91                                                                                     \
  92     BOOST_PP_REPEAT_FROM_TO(                                                        \
  93         lo, BOOST_PP_INC(hi), BOOST_PARAMETER_FUN_DECL, (ret, name, parameters))    \
  94                                                                                     \
  95     template<class Params>                                                          \
  96     ret BOOST_PP_CAT(name, _with_named_params)(Params const& p)
  97
  98 #endif // BOOST_PARAMETER_MACROS_050412_HPP
  99