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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 PY_FUNCTION_DWA200286_HPP
# define PY_FUNCTION_DWA200286_HPP
# include <boost/python/detail/signature.hpp>
# include <boost/detail/workaround.hpp>
# include <boost/mpl/size.hpp>
# include <memory>
namespace boost { namespace python { namespace objects {
// This type is used as a "generalized Python callback", wrapping the
// function signature:
//
// PyObject* (PyObject* args, PyObject* keywords)
struct BOOST_PYTHON_DECL py_function_impl_base
{
virtual ~py_function_impl_base();
virtual PyObject* operator()(PyObject*, PyObject*) = 0;
virtual unsigned min_arity() const = 0;
virtual unsigned max_arity() const;
virtual python::detail::py_func_sig_info signature() const = 0;
};
template <class Caller>
struct caller_py_function_impl : py_function_impl_base
{
caller_py_function_impl(Caller const& caller)
: m_caller(caller)
{}
PyObject* operator()(PyObject* args, PyObject* kw)
{
return m_caller(args, kw);
}
virtual unsigned min_arity() const
{
return m_caller.min_arity();
}
virtual python::detail::py_func_sig_info signature() const
{
return m_caller.signature();
}
private:
Caller m_caller;
};
template <class Caller, class Sig>
struct signature_py_function_impl : py_function_impl_base
{
signature_py_function_impl(Caller const& caller)
: m_caller(caller)
{}
PyObject* operator()(PyObject* args, PyObject* kw)
{
return m_caller(args, kw);
}
virtual unsigned min_arity() const
{
return mpl::size<Sig>::value - 1;
}
virtual python::detail::py_func_sig_info signature() const
{
python::detail::signature_element const* sig = python::detail::signature<Sig>::elements();
python::detail::py_func_sig_info res = {sig, sig};
return res;
}
private:
Caller m_caller;
};
template <class Caller, class Sig>
struct full_py_function_impl : py_function_impl_base
{
full_py_function_impl(Caller const& caller, unsigned min_arity, unsigned max_arity)
: m_caller(caller)
, m_min_arity(min_arity)
, m_max_arity(max_arity > min_arity ? max_arity : min_arity)
{}
PyObject* operator()(PyObject* args, PyObject* kw)
{
return m_caller(args, kw);
}
virtual unsigned min_arity() const
{
return m_min_arity;
}
virtual unsigned max_arity() const
{
return m_max_arity;
}
virtual python::detail::py_func_sig_info signature() const
{
python::detail::signature_element const* sig = python::detail::signature<Sig>::elements();
python::detail::py_func_sig_info res = {sig, sig};
return res;
}
private:
Caller m_caller;
unsigned m_min_arity;
unsigned m_max_arity;
};
struct py_function
{
template <class Caller>
py_function(Caller const& caller)
: m_impl(new caller_py_function_impl<Caller>(caller))
{}
template <class Caller, class Sig>
py_function(Caller const& caller, Sig)
: m_impl(new signature_py_function_impl<Caller, Sig>(caller))
{}
template <class Caller, class Sig>
py_function(Caller const& caller, Sig, int min_arity, int max_arity = 0)
: m_impl(new full_py_function_impl<Caller, Sig>(caller, min_arity, max_arity))
{}
py_function(py_function const& rhs)
: m_impl(rhs.m_impl)
{}
PyObject* operator()(PyObject* args, PyObject* kw) const
{
return (*m_impl)(args, kw);
}
unsigned min_arity() const
{
return m_impl->min_arity();
}
unsigned max_arity() const
{
return m_impl->max_arity();
}
python::detail::signature_element const* signature() const
{
return m_impl->signature().signature;
}
python::detail::signature_element const& get_return_type() const
{
return *m_impl->signature().ret;
}
private:
mutable std::auto_ptr<py_function_impl_base> m_impl;
};
}}} // namespace boost::python::objects
#endif // PY_FUNCTION_DWA200286_HPP
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