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