ceph/src/boost/libs/python/include/boost/python/detail/nullary_function_adaptor.hpp

   1 // Copyright David Abrahams 2003.
   2 // Distributed under the Boost Software License, Version 1.0. (See
   3 // accompanying file LICENSE_1_0.txt or copy at
   4 // http://www.boost.org/LICENSE_1_0.txt)
   5 #ifndef NULLARY_FUNCTION_ADAPTOR_DWA2003824_HPP
   6 # define NULLARY_FUNCTION_ADAPTOR_DWA2003824_HPP
   7
   8 # include <boost/python/detail/prefix.hpp>
   9 # include <boost/preprocessor/iteration/local.hpp>
  10 # include <boost/preprocessor/facilities/intercept.hpp>
  11 # include <boost/preprocessor/repetition/enum_params.hpp>
  12 # include <boost/preprocessor/repetition/enum_binary_params.hpp>
  13
  14 namespace boost { namespace python { namespace detail {
  15
  16 // nullary_function_adaptor -- a class template which ignores its
  17 // arguments and calls a nullary function instead.  Used for building
  18 // error-reporting functions, c.f. pure_virtual
  19 template <class NullaryFunction>
  20 struct nullary_function_adaptor
  21 {
  22     nullary_function_adaptor(NullaryFunction fn)
  23       : m_fn(fn)
  24     {}
  25
  26     void operator()() const { m_fn(); }
  27
  28 # define BOOST_PP_LOCAL_MACRO(i)                                            \
  29     template <BOOST_PP_ENUM_PARAMS_Z(1, i, class A)>                        \
  30     void operator()(                                                        \
  31         BOOST_PP_ENUM_BINARY_PARAMS_Z(1, i, A, const& BOOST_PP_INTERCEPT)   \
  32     ) const                                                                 \
  33     {                                                                       \
  34         m_fn();                                                             \
  35     }
  36
  37 # define BOOST_PP_LOCAL_LIMITS (1, BOOST_PYTHON_MAX_ARITY)
  38 # include BOOST_PP_LOCAL_ITERATE()
  39
  40  private:
  41     NullaryFunction m_fn;
  42 };
  43
  44 }}} // namespace boost::python::detail
  45
  46 #endif // NULLARY_FUNCTION_ADAPTOR_DWA2003824_HPP