Chris@16: // Copyright David Abrahams 2002.
Chris@16: // Distributed under the Boost Software License, Version 1.0. (See
Chris@16: // accompanying file LICENSE_1_0.txt or copy at
Chris@16: // http://www.boost.org/LICENSE_1_0.txt)
Chris@16: #ifndef KEYWORDS_DWA2002323_HPP
Chris@16: # define KEYWORDS_DWA2002323_HPP
Chris@16: 
Chris@16: # include <boost/python/detail/prefix.hpp>
Chris@16: 
Chris@16: # include <boost/python/args_fwd.hpp>
Chris@16: # include <boost/config.hpp>
Chris@16: # include <boost/python/detail/preprocessor.hpp>
Chris@16: # include <boost/python/detail/type_list.hpp>
Chris@16: 
Chris@16: # include <boost/type_traits/is_reference.hpp>
Chris@16: # include <boost/type_traits/remove_reference.hpp>
Chris@16: # include <boost/type_traits/remove_cv.hpp>
Chris@16: 
Chris@16: # include <boost/preprocessor/enum_params.hpp>
Chris@16: # include <boost/preprocessor/repeat.hpp>
Chris@16: # include <boost/preprocessor/facilities/intercept.hpp>
Chris@16: # include <boost/preprocessor/iteration/local.hpp>
Chris@16: 
Chris@16: # include <boost/python/detail/mpl_lambda.hpp>
Chris@16: # include <boost/python/object_core.hpp>
Chris@16: 
Chris@16: # include <boost/mpl/bool.hpp>
Chris@16: 
Chris@16: # include <cstddef>
Chris@16: # include <algorithm>
Chris@16: 
Chris@16: namespace boost { namespace python {
Chris@16: 
Chris@16: typedef detail::keywords<1> arg;
Chris@16: typedef arg arg_; // gcc 2.96 workaround
Chris@16: 
Chris@16: namespace detail
Chris@16: {
Chris@16:   template <std::size_t nkeywords>
Chris@16:   struct keywords_base
Chris@16:   {
Chris@16:       BOOST_STATIC_CONSTANT(std::size_t, size = nkeywords);
Chris@16:       
Chris@16:       keyword_range range() const
Chris@16:       {
Chris@16:           return keyword_range(elements, elements + nkeywords);
Chris@16:       }
Chris@16: 
Chris@16:       keyword elements[nkeywords];
Chris@16: 
Chris@16:       keywords<nkeywords+1>
Chris@16:       operator,(python::arg const &k) const;
Chris@16: 
Chris@16:       keywords<nkeywords + 1>
Chris@16:       operator,(char const *name) const;
Chris@16:   };
Chris@16:   
Chris@16:   template <std::size_t nkeywords>
Chris@16:   struct keywords : keywords_base<nkeywords>
Chris@16:   {
Chris@16:   };
Chris@16: 
Chris@16:   template <>
Chris@16:   struct keywords<1> : keywords_base<1>
Chris@16:   {
Chris@16:       explicit keywords(char const *name)
Chris@16:       {
Chris@16:           elements[0].name = name;
Chris@16:       }
Chris@16:     
Chris@16:       template <class T>
Chris@16:       python::arg& operator=(T const& value)
Chris@16:       {
Chris@16:           object z(value);
Chris@16:           elements[0].default_value = handle<>(python::borrowed(object(value).ptr()));
Chris@16:           return *this;
Chris@16:       }
Chris@16:     
Chris@16:       operator detail::keyword const&() const
Chris@16:       {
Chris@16:           return elements[0];
Chris@16:       }
Chris@16:   };
Chris@16: 
Chris@16:   template <std::size_t nkeywords>
Chris@16:   inline
Chris@16:   keywords<nkeywords+1>
Chris@16:   keywords_base<nkeywords>::operator,(python::arg const &k) const
Chris@16:   {
Chris@16:       keywords<nkeywords> const& l = *static_cast<keywords<nkeywords> const*>(this);
Chris@16:       python::detail::keywords<nkeywords+1> res;
Chris@16:       std::copy(l.elements, l.elements+nkeywords, res.elements);
Chris@16:       res.elements[nkeywords] = k.elements[0];
Chris@16:       return res;
Chris@16:   }
Chris@16: 
Chris@16:   template <std::size_t nkeywords>
Chris@16:   inline
Chris@16:   keywords<nkeywords + 1>
Chris@16:   keywords_base<nkeywords>::operator,(char const *name) const
Chris@16:   {
Chris@16:       return this->operator,(python::arg(name));
Chris@16:   }
Chris@16: 
Chris@16: # ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
Chris@16:   template<typename T>
Chris@16:   struct is_keywords
Chris@16:   {
Chris@16:       BOOST_STATIC_CONSTANT(bool, value = false); 
Chris@16:   };
Chris@16: 
Chris@16:   template<std::size_t nkeywords>
Chris@16:   struct is_keywords<keywords<nkeywords> >
Chris@16:   {
Chris@16:       BOOST_STATIC_CONSTANT(bool, value = true);
Chris@16:   };
Chris@16:   template <class T>
Chris@16:   struct is_reference_to_keywords
Chris@16:   {
Chris@16:       BOOST_STATIC_CONSTANT(bool, is_ref = is_reference<T>::value);
Chris@16:       typedef typename remove_reference<T>::type deref;
Chris@16:       typedef typename remove_cv<deref>::type key_t;
Chris@16:       BOOST_STATIC_CONSTANT(bool, is_key = is_keywords<key_t>::value);
Chris@16:       BOOST_STATIC_CONSTANT(bool, value = (is_ref & is_key));
Chris@16:       
Chris@16:       typedef mpl::bool_<value> type;
Chris@16:       BOOST_PYTHON_MPL_LAMBDA_SUPPORT(1,is_reference_to_keywords,(T))
Chris@16:   };
Chris@16: # else 
Chris@16:   typedef char (&yes_keywords_t)[1];
Chris@16:   typedef char (&no_keywords_t)[2];
Chris@16:       
Chris@16:   no_keywords_t is_keywords_test(...);
Chris@16: 
Chris@16:   template<std::size_t nkeywords>
Chris@16:   yes_keywords_t is_keywords_test(void (*)(keywords<nkeywords>&));
Chris@16: 
Chris@16:   template<std::size_t nkeywords>
Chris@16:   yes_keywords_t is_keywords_test(void (*)(keywords<nkeywords> const&));
Chris@16: 
Chris@16:   template<typename T>
Chris@16:   class is_reference_to_keywords
Chris@16:   {
Chris@16:    public:
Chris@16:       BOOST_STATIC_CONSTANT(
Chris@16:           bool, value = (
Chris@16:               sizeof(detail::is_keywords_test( (void (*)(T))0 ))
Chris@16:               == sizeof(detail::yes_keywords_t)));
Chris@16: 
Chris@16:       typedef mpl::bool_<value> type;
Chris@16:       BOOST_PYTHON_MPL_LAMBDA_SUPPORT(1,is_reference_to_keywords,(T))
Chris@16:   };
Chris@16: # endif 
Chris@16: }
Chris@16: 
Chris@16: inline detail::keywords<1> args(char const* name)
Chris@16: { 
Chris@16:     return detail::keywords<1>(name);
Chris@16: }
Chris@16: 
Chris@16: #  define BOOST_PYTHON_ASSIGN_NAME(z, n, _) result.elements[n].name = name##n;
Chris@16: #  define BOOST_PP_LOCAL_MACRO(n)                                               \
Chris@16: inline detail::keywords<n> args(BOOST_PP_ENUM_PARAMS_Z(1, n, char const* name)) \
Chris@16: {                                                                               \
Chris@16:     detail::keywords<n> result;                                                 \
Chris@16:     BOOST_PP_REPEAT_1(n, BOOST_PYTHON_ASSIGN_NAME, _)                           \
Chris@16:     return result;                                                              \
Chris@16: }
Chris@16: #  define BOOST_PP_LOCAL_LIMITS (2, BOOST_PYTHON_MAX_ARITY)
Chris@16: #  include BOOST_PP_LOCAL_ITERATE()
Chris@16: 
Chris@16: }} // namespace boost::python
Chris@16: 
Chris@16: 
Chris@16: # endif // KEYWORDS_DWA2002323_HPP