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 {
nullary_function_adaptorboost::python::detail::nullary_function_adaptor22     nullary_function_adaptor(NullaryFunction fn)
23       : m_fn(fn)
24     {}
25 
operator ()boost::python::detail::nullary_function_adaptor26     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
47