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