// 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 |