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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 HANDLE_DWA200269_HPP
# define HANDLE_DWA200269_HPP
# include <boost/python/detail/prefix.hpp>
# include <boost/python/cast.hpp>
# include <boost/python/errors.hpp>
# include <boost/python/borrowed.hpp>
# include <boost/python/handle_fwd.hpp>
# include <boost/python/refcount.hpp>
# include <boost/python/tag.hpp>
# include <boost/python/detail/raw_pyobject.hpp>
namespace boost { namespace python {
template <class T> struct null_ok;
template <class T>
inline null_ok<T>* allow_null(T* p)
{
return (null_ok<T>*)p;
}
namespace detail
{
template <class T>
inline T* manage_ptr(detail::borrowed<null_ok<T> >* p, int)
{
return python::xincref((T*)p);
}
template <class T>
inline T* manage_ptr(null_ok<detail::borrowed<T> >* p, int)
{
return python::xincref((T*)p);
}
template <class T>
inline T* manage_ptr(detail::borrowed<T>* p, long)
{
return python::incref(expect_non_null((T*)p));
}
template <class T>
inline T* manage_ptr(null_ok<T>* p, long)
{
return (T*)p;
}
template <class T>
inline T* manage_ptr(T* p, ...)
{
return expect_non_null(p);
}
}
template <class T>
class handle
{
typedef T* (handle::* bool_type )() const;
public: // types
typedef T element_type;
public: // member functions
handle();
~handle();
template <class Y>
explicit handle(Y* p)
: m_p(
python::upcast<T>(
detail::manage_ptr(p, 0)
)
)
{
}
handle& operator=(handle const& r)
{
python::xdecref(m_p);
m_p = python::xincref(r.m_p);
return *this;
}
template<typename Y>
handle& operator=(handle<Y> const & r) // never throws
{
python::xdecref(m_p);
m_p = python::xincref(python::upcast<T>(r.get()));
return *this;
}
template <typename Y>
handle(handle<Y> const& r)
: m_p(python::xincref(python::upcast<T>(r.get())))
{
}
handle(handle const& r)
: m_p(python::xincref(r.m_p))
{
}
T* operator-> () const;
T& operator* () const;
T* get() const;
T* release();
void reset();
operator bool_type() const // never throws
{
return m_p ? &handle<T>::get : 0;
}
bool operator! () const; // never throws
public: // implementation details -- do not touch
// Defining this in the class body suppresses a VC7 link failure
inline handle(detail::borrowed_reference x)
: m_p(
python::incref(
downcast<T>((PyObject*)x)
))
{
}
private: // data members
T* m_p;
};
#ifdef BOOST_NO_ARGUMENT_DEPENDENT_LOOKUP
} // namespace python
#endif
template<class T> inline T * get_pointer(python::handle<T> const & p)
{
return p.get();
}
#ifdef BOOST_NO_ARGUMENT_DEPENDENT_LOOKUP
namespace python {
#else
// We don't want get_pointer above to hide the others
using boost::get_pointer;
#endif
typedef handle<PyTypeObject> type_handle;
//
// Compile-time introspection
//
template<typename T>
class is_handle
{
public:
BOOST_STATIC_CONSTANT(bool, value = false);
};
template<typename T>
class is_handle<handle<T> >
{
public:
BOOST_STATIC_CONSTANT(bool, value = true);
};
//
// implementations
//
template <class T>
inline handle<T>::handle()
: m_p(0)
{
}
template <class T>
inline handle<T>::~handle()
{
python::xdecref(m_p);
}
template <class T>
inline T* handle<T>::operator->() const
{
return m_p;
}
template <class T>
inline T& handle<T>::operator*() const
{
return *m_p;
}
template <class T>
inline T* handle<T>::get() const
{
return m_p;
}
template <class T>
inline bool handle<T>::operator!() const
{
return m_p == 0;
}
template <class T>
inline T* handle<T>::release()
{
T* result = m_p;
m_p = 0;
return result;
}
template <class T>
inline void handle<T>::reset()
{
python::xdecref(m_p);
m_p = 0;
}
// Because get_managed_object must return a non-null PyObject*, we
// return Py_None if the handle is null.
template <class T>
inline PyObject* get_managed_object(handle<T> const& h, tag_t)
{
return h.get() ? python::upcast<PyObject>(h.get()) : Py_None;
}
}} // namespace boost::python
#endif // HANDLE_DWA200269_HPP
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