stc/exp/ml_stc_linux_make_v1.0/include/boost/detail/is_xxx.hpp

   1 // Copyright David Abrahams 2005. Distributed under the Boost\r
   2 // Software License, Version 1.0. (See accompanying\r
   3 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)\r
   4 #ifndef BOOST_DETAIL_IS_XXX_DWA20051011_HPP\r
   5 # define BOOST_DETAIL_IS_XXX_DWA20051011_HPP\r
   6 \r
   7 # include <boost/config.hpp>\r
   8 # include <boost/mpl/bool.hpp>\r
   9 # include <boost/preprocessor/enum_params.hpp>\r
  10 \r
  11 # if defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION)\r
  12 # include <boost/type_traits/is_reference.hpp>\r
  13 # include <boost/type_traits/add_reference.hpp>\r
  14 \r
  15 #  define BOOST_DETAIL_IS_XXX_DEF(name, qualified_name, nargs)          \\r
  16 template <class X_>                                                     \\r
  17 struct is_##name                                                        \\r
  18 {                                                                       \\r
  19     typedef char yes;                                                   \\r
  20     typedef char (&no)[2];                                              \\r
  21                                                                         \\r
  22     static typename add_reference<X_>::type dummy;                      \\r
  23                                                                         \\r
  24     struct helpers                                                      \\r
  25     {                                                                   \\r
  26         template < BOOST_PP_ENUM_PARAMS_Z(1, nargs, class U) >          \\r
  27         static yes test(                                                \\r
  28            qualified_name< BOOST_PP_ENUM_PARAMS_Z(1, nargs, U) >&, int  \\r
  29         );                                                              \\r
  30                                                                         \\r
  31         template <class U>                                              \\r
  32         static no test(U&, ...);                                        \\r
  33     };                                                                  \\r
  34                                                                         \\r
  35     BOOST_STATIC_CONSTANT(                                              \\r
  36         bool, value                                                     \\r
  37         = !is_reference<X_>::value                                      \\r
  38         & (sizeof(helpers::test(dummy, 0)) == sizeof(yes)));            \\r
  39                                                                         \\r
  40     typedef mpl::bool_<value> type;                                     \\r
  41 };\r
  42 \r
  43 # else\r
  44 \r
  45 #  define BOOST_DETAIL_IS_XXX_DEF(name, qualified_name, nargs)  \\r
  46 template <class T>                                              \\r
  47 struct is_##name : mpl::false_                                  \\r
  48 {                                                               \\r
  49 };                                                              \\r
  50                                                                 \\r
  51 template < BOOST_PP_ENUM_PARAMS_Z(1, nargs, class T) >          \\r
  52 struct is_##name<                                               \\r
  53    qualified_name< BOOST_PP_ENUM_PARAMS_Z(1, nargs, T) >        \\r
  54 >                                                               \\r
  55    : mpl::true_                                                 \\r
  56 {                                                               \\r
  57 };\r
  58 \r
  59 # endif\r
  60 \r
  61 #endif // BOOST_DETAIL_IS_XXX_DWA20051011_HPP\r