ceph/src/boost/boost/type_erasure/detail/null.hpp

   1 // Boost.TypeErasure library
   2 //
   3 // Copyright 2012 Steven Watanabe
   4 //
   5 // Distributed under the Boost Software License Version 1.0. (See
   6 // accompanying file LICENSE_1_0.txt or copy at
   7 // http://www.boost.org/LICENSE_1_0.txt)
   8 //
   9 // $Id$
  10
  11 #if !defined(BOOST_PP_IS_ITERATING)
  12
  13 #ifndef BOOST_TYPE_ERASURE_DETAIL_NULL_HPP_INCLUDED
  14 #define BOOST_TYPE_ERASURE_DETAIL_NULL_HPP_INCLUDED
  15
  16 #include <boost/config.hpp>
  17 #include <boost/throw_exception.hpp>
  18 #include <boost/type_traits/remove_pointer.hpp>
  19 #include <boost/preprocessor/iteration/iterate.hpp>
  20 #include <boost/preprocessor/repetition/enum_params.hpp>
  21 #include <boost/preprocessor/repetition/enum_trailing_params.hpp>
  22 #include <boost/type_erasure/config.hpp>
  23 #include <boost/type_erasure/exception.hpp>
  24
  25 namespace boost {
  26 namespace type_erasure {
  27 namespace detail {
  28
  29 template<class Sig>
  30 struct null_throw;
  31
  32 template<class Concept>
  33 struct get_null_vtable_entry {
  34     typedef ::boost::type_erasure::detail::null_throw<
  35         typename ::boost::remove_pointer<typename Concept::type>::type> type;
  36 };
  37
  38 #ifdef BOOST_NO_CXX11_VARIADIC_TEMPLATES
  39
  40 #define BOOST_PP_FILENAME_1 <boost/type_erasure/detail/null.hpp>
  41 #define BOOST_PP_ITERATION_LIMITS (0, BOOST_TYPE_ERASURE_MAX_ARITY)
  42 #include BOOST_PP_ITERATE()
  43
  44 #else
  45
  46 template<class R, class... T>
  47 struct null_throw<R(T...)> {
  48     static R value(T...) {
  49         BOOST_THROW_EXCEPTION(::boost::type_erasure::bad_function_call());
  50     }
  51 };
  52
  53 #endif
  54
  55 }
  56 }
  57 }
  58
  59 #endif
  60
  61 #else
  62
  63 #define N BOOST_PP_ITERATION()
  64
  65 template<class R BOOST_PP_ENUM_TRAILING_PARAMS(N, class T)>
  66 struct null_throw<R(BOOST_PP_ENUM_PARAMS(N, T))> {
  67     static R value(BOOST_PP_ENUM_PARAMS(N, T)) {
  68         BOOST_THROW_EXCEPTION(::boost::type_erasure::bad_function_call());
  69     }
  70 };
  71
  72 #undef N
  73
  74 #endif