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Copy pathargs.hpp
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146 lines (119 loc) · 4.1 KB
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// Copyright David Abrahams 2002.
// Distributed under the Boost Software License, Version 1.0. (See
// accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
#ifndef KEYWORDS_DWA2002323_HPP
# define KEYWORDS_DWA2002323_HPP
# include <boost/python/detail/prefix.hpp>
# include <boost/python/args_fwd.hpp>
# include <boost/config.hpp>
# include <boost/python/detail/preprocessor.hpp>
# include <boost/python/detail/type_list.hpp>
# include <boost/python/detail/type_traits.hpp>
# include <boost/preprocessor/enum_params.hpp>
# include <boost/preprocessor/repeat.hpp>
# include <boost/preprocessor/facilities/intercept.hpp>
# include <boost/preprocessor/iteration/local.hpp>
# include <boost/python/detail/mpl_lambda.hpp>
# include <boost/python/object_core.hpp>
# include <boost/mpl/bool.hpp>
# include <cstddef>
# include <algorithm>
namespace boost { namespace python {
typedef detail::keywords<1> arg;
typedef arg arg_; // gcc 2.96 workaround
namespace detail
{
template <std::size_t nkeywords>
struct keywords_base
{
BOOST_STATIC_CONSTANT(std::size_t, size = nkeywords);
keyword_range range() const
{
return keyword_range(elements, elements + nkeywords);
}
keyword elements[nkeywords];
keywords<nkeywords+1>
operator,(python::arg const &k) const;
keywords<nkeywords + 1>
operator,(char const *name) const;
};
template <std::size_t nkeywords>
struct keywords : keywords_base<nkeywords>
{
};
template <>
struct keywords<1> : keywords_base<1>
{
explicit keywords(char const *name)
{
elements[0].name = name;
}
template <class T>
python::arg& operator=(T const& value)
{
object z(value);
elements[0].default_value = handle<>(python::borrowed(object(value).ptr()));
return *this;
}
operator detail::keyword const&() const
{
return elements[0];
}
};
template <std::size_t nkeywords>
inline
keywords<nkeywords+1>
keywords_base<nkeywords>::operator,(python::arg const &k) const
{
keywords<nkeywords> const& l = *static_cast<keywords<nkeywords> const*>(this);
python::detail::keywords<nkeywords+1> res;
std::copy(l.elements, l.elements+nkeywords, res.elements);
res.elements[nkeywords] = k.elements[0];
return res;
}
template <std::size_t nkeywords>
inline
keywords<nkeywords + 1>
keywords_base<nkeywords>::operator,(char const *name) const
{
return this->operator,(python::arg(name));
}
template<typename T>
struct is_keywords
{
BOOST_STATIC_CONSTANT(bool, value = false);
};
template<std::size_t nkeywords>
struct is_keywords<keywords<nkeywords> >
{
BOOST_STATIC_CONSTANT(bool, value = true);
};
template <class T>
struct is_reference_to_keywords
{
BOOST_STATIC_CONSTANT(bool, is_ref = detail::is_reference<T>::value);
typedef typename detail::remove_reference<T>::type deref;
typedef typename detail::remove_cv<deref>::type key_t;
BOOST_STATIC_CONSTANT(bool, is_key = is_keywords<key_t>::value);
BOOST_STATIC_CONSTANT(bool, value = (is_ref & is_key));
typedef mpl::bool_<value> type;
BOOST_PYTHON_MPL_LAMBDA_SUPPORT(1,is_reference_to_keywords,(T))
};
}
inline detail::keywords<1> args(char const* name)
{
return detail::keywords<1>(name);
}
# define BOOST_PYTHON_ASSIGN_NAME(z, n, _) result.elements[n].name = name##n;
# define BOOST_PP_LOCAL_MACRO(n) \
inline detail::keywords<n> args(BOOST_PP_ENUM_PARAMS_Z(1, n, char const* name)) \
{ \
detail::keywords<n> result; \
BOOST_PP_REPEAT_1(n, BOOST_PYTHON_ASSIGN_NAME, _) \
return result; \
}
# define BOOST_PP_LOCAL_LIMITS (2, BOOST_PYTHON_MAX_ARITY)
# include BOOST_PP_LOCAL_ITERATE()
}} // namespace boost::python
# endif // KEYWORDS_DWA2002323_HPP