181 lines
4.6 KiB
Plaintext
181 lines
4.6 KiB
Plaintext
// 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 PY_FUNCTION_DWA200286_HPP
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# define PY_FUNCTION_DWA200286_HPP
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# include <boost/python/detail/signature.hpp>
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# include <boost/detail/workaround.hpp>
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# include <boost/mpl/size.hpp>
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# include <memory>
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namespace boost { namespace python { namespace objects {
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// This type is used as a "generalized Python callback", wrapping the
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// function signature:
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//
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// PyObject* (PyObject* args, PyObject* keywords)
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struct BOOST_PYTHON_DECL py_function_impl_base
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{
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virtual ~py_function_impl_base();
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virtual PyObject* operator()(PyObject*, PyObject*) = 0;
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virtual unsigned min_arity() const = 0;
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virtual unsigned max_arity() const;
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virtual python::detail::py_func_sig_info signature() const = 0;
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};
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template <class Caller>
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struct caller_py_function_impl : py_function_impl_base
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{
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caller_py_function_impl(Caller const& caller)
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: m_caller(caller)
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{}
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PyObject* operator()(PyObject* args, PyObject* kw)
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{
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return m_caller(args, kw);
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}
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virtual unsigned min_arity() const
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{
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return m_caller.min_arity();
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}
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virtual python::detail::py_func_sig_info signature() const
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{
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return m_caller.signature();
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}
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private:
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Caller m_caller;
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};
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template <class Caller, class Sig>
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struct signature_py_function_impl : py_function_impl_base
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{
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signature_py_function_impl(Caller const& caller)
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: m_caller(caller)
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{}
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PyObject* operator()(PyObject* args, PyObject* kw)
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{
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return m_caller(args, kw);
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}
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virtual unsigned min_arity() const
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{
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return mpl::size<Sig>::value - 1;
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}
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virtual python::detail::py_func_sig_info signature() const
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{
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python::detail::signature_element const* sig = python::detail::signature<Sig>::elements();
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python::detail::py_func_sig_info res = {sig, sig};
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return res;
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}
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private:
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Caller m_caller;
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};
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template <class Caller, class Sig>
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struct full_py_function_impl : py_function_impl_base
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{
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full_py_function_impl(Caller const& caller, unsigned min_arity, unsigned max_arity)
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: m_caller(caller)
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, m_min_arity(min_arity)
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, m_max_arity(max_arity > min_arity ? max_arity : min_arity)
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{}
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PyObject* operator()(PyObject* args, PyObject* kw)
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{
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return m_caller(args, kw);
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}
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virtual unsigned min_arity() const
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{
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return m_min_arity;
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}
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virtual unsigned max_arity() const
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{
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return m_max_arity;
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}
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virtual python::detail::py_func_sig_info signature() const
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{
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python::detail::signature_element const* sig = python::detail::signature<Sig>::elements();
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python::detail::py_func_sig_info res = {sig, sig};
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return res;
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}
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private:
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Caller m_caller;
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unsigned m_min_arity;
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unsigned m_max_arity;
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};
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struct py_function
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{
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template <class Caller>
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py_function(Caller const& caller)
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: m_impl(new caller_py_function_impl<Caller>(caller))
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{}
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template <class Caller, class Sig>
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py_function(Caller const& caller, Sig)
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: m_impl(new signature_py_function_impl<Caller, Sig>(caller))
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{}
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template <class Caller, class Sig>
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py_function(Caller const& caller, Sig, int min_arity, int max_arity = 0)
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: m_impl(new full_py_function_impl<Caller, Sig>(caller, min_arity, max_arity))
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{}
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py_function(py_function const& rhs)
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#if __cplusplus < 201103L
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: m_impl(rhs.m_impl)
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#else
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: m_impl(std::move(rhs.m_impl))
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#endif
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{}
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PyObject* operator()(PyObject* args, PyObject* kw) const
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{
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return (*m_impl)(args, kw);
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}
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unsigned min_arity() const
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{
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return m_impl->min_arity();
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}
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unsigned max_arity() const
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{
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return m_impl->max_arity();
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}
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python::detail::signature_element const* signature() const
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{
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return m_impl->signature().signature;
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}
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python::detail::signature_element const& get_return_type() const
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{
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return *m_impl->signature().ret;
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}
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private:
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#if __cplusplus < 201103L
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mutable std::auto_ptr<py_function_impl_base> m_impl;
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#else
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mutable std::unique_ptr<py_function_impl_base> m_impl;
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#endif
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};
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}}} // namespace boost::python::objects
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#endif // PY_FUNCTION_DWA200286_HPP
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