ceph/src/boost/libs/signals2/include/boost/signals2/detail/variadic_arg_type.hpp

   1 // Copyright Frank Mori Hess 2009
   2 //
   3 // Use, modification and
   4 // distribution is subject to the Boost Software License, Version
   5 // 1.0. (See accompanying file LICENSE_1_0.txt or copy at
   6 // http://www.boost.org/LICENSE_1_0.txt)
   7
   8 // For more information, see http://www.boost.org
   9
  10 #ifndef BOOST_SIGNALS2_DETAIL_VARIADIC_ARG_TYPE_HPP
  11 #define BOOST_SIGNALS2_DETAIL_VARIADIC_ARG_TYPE_HPP
  12
  13 #include <functional>
  14
  15 namespace boost
  16 {
  17   namespace signals2
  18   {
  19     namespace detail
  20     {
  21       template<unsigned, typename ... Args> class variadic_arg_type;
  22
  23       template<typename T, typename ... Args> class variadic_arg_type<0, T, Args...>
  24       {
  25       public:
  26         typedef T type;
  27       };
  28
  29       template<unsigned n, typename T, typename ... Args> class variadic_arg_type<n, T, Args...>
  30       {
  31       public:
  32         typedef typename variadic_arg_type<n - 1, Args...>::type type;
  33       };
  34
  35       template <typename R, typename ... Args>
  36         struct std_functional_base
  37       {};
  38       template <typename R, typename T1>
  39         struct std_functional_base<R, T1>: public std::unary_function<T1, R>
  40       {};
  41       template <typename R, typename T1, typename T2>
  42         struct std_functional_base<R, T1, T2>: public std::binary_function<T1, T2, R>
  43       {};
  44     } // namespace detail
  45   } // namespace signals2
  46 } // namespace boost
  47
  48
  49 #endif // BOOST_SIGNALS2_DETAIL_VARIADIC_ARG_TYPE_HPP