python/include/boost/python/object/py_function.hpp at develop · boostorg/python · GitHub

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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)

#if defined(BOOST_NO_CXX11_SMART_PTR)

: m_impl(rhs.m_impl)

#else

: m_impl(std::move(rhs.m_impl))

#endif

{}

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:

#if defined(BOOST_NO_CXX11_SMART_PTR)

mutable std::auto_ptr<py_function_impl_base> m_impl;

#else

mutable std::unique_ptr<py_function_impl_base> m_impl;

#endif

};

}}} // namespace boost::python::objects

#endif // PY_FUNCTION_DWA200286_HPP

python/include/boost/python/object/py_function.hpp at develop · boostorg/python · GitHub

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