| // 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 |