handle Class Reference

#include <pytypes.h>

Inheritance diagram for handle:

Public Member Functions
template<typename T >
T	cast () const
template<>
void	cast () const
bool	check () const
const handle &	dec_ref () const &
	handle ()=default
	The default constructor creates a handle with a nullptr-valued pointer. More...
template<typename T , detail::enable_if_t< detail::all_of< detail::none_of< std::is_base_of< handle, T >, detail::is_pyobj_ptr_or_nullptr_t< T >>, std::is_convertible< T, PyObject * >>::value, int > = 0>
	handle (T &obj)
	Enable implicit conversion through T::operator PyObject *(). More...
template<typename T , detail::enable_if_t< detail::is_pyobj_ptr_or_nullptr_t< T >::value, int > = 0>
	handle (T ptr)
const handle &	inc_ref () const &
	operator bool () const
	Return true when the handle wraps a valid Python object. More...
bool	operator!= (const handle &h) const
bool	operator== (const handle &h) const
PyObject *&	ptr ()
PyObject *	ptr () const
	Return the underlying PyObject * pointer. More...

Static Public Member Functions
static std::size_t	inc_ref_counter ()

Protected Attributes
PyObject *	m_ptr = nullptr

Private Member Functions
void	throw_gilstate_error (const std::string &function_name) const

Static Private Member Functions
static std::size_t	inc_ref_counter (std::size_t add)

Detailed Description

\rst Holds a reference to a Python object (no reference counting)

The handle class is a thin wrapper around an arbitrary Python object (i.e. a PyObject * in Python's C API). It does not perform any automatic reference counting and merely provides a basic C++ interface to various Python API functions.

.. seealso:: The object class inherits from handle and adds automatic reference counting features. \endrst

Definition at line 226 of file pytypes.h.

Constructor & Destructor Documentation

handle() [1/3]

handle::handle ( )

default

The default constructor creates a handle with a nullptr-valued pointer.

handle() [2/3]

template<typename T , detail::enable_if_t< detail::is_pyobj_ptr_or_nullptr_t< T >::value, int > = 0>

handle::handle ( T  ptr )

inline

Enable implicit conversion from PyObject * and nullptr. Not using handle(PyObject *ptr) to avoid implicit conversion from 0.

Definition at line 236 of file pytypes.h.

handle() [3/3]

template<typename T , detail::enable_if_t< detail::all_of< detail::none_of< std::is_base_of< handle, T >, detail::is_pyobj_ptr_or_nullptr_t< T >>, std::is_convertible< T, PyObject * >>::value, int > = 0>

handle::handle ( T &  obj )

inline

Enable implicit conversion through T::operator PyObject *().

Definition at line 247 of file pytypes.h.

Member Function Documentation

cast() [1/2]

template<typename T >

T handle::cast

\rst Attempt to cast the Python object into the given C++ type. A cast_error will be throw upon failure. \endrst

Definition at line 1234 of file cast.h.

cast() [2/2]

template<>

void handle::cast ( ) const

inline

Definition at line 1238 of file cast.h.

check()

bool handle::check ( ) const

inline

Definition at line 303 of file pytypes.h.

dec_ref()

const handle& handle::dec_ref ( ) const &

inline

\rst Manually decrease the reference count of the Python object. Usually, it is preferable to use the object class which derives from handle and calls this function automatically. Returns a reference to itself. \endrst

Definition at line 276 of file pytypes.h.

inc_ref()

const handle& handle::inc_ref ( ) const &

inline

\rst Manually increase the reference count of the Python object. Usually, it is preferable to use the object class which derives from handle and calls this function automatically. Returns a reference to itself. \endrst

Definition at line 258 of file pytypes.h.

inc_ref_counter() [1/2]

static std::size_t handle::inc_ref_counter ( )

inlinestatic

Definition at line 342 of file pytypes.h.

inc_ref_counter() [2/2]

static std::size_t handle::inc_ref_counter ( std::size_t  add )

inlinestaticprivate

Definition at line 335 of file pytypes.h.

operator bool()

handle::operator bool ( ) const

inlineexplicit

Return true when the handle wraps a valid Python object.

Definition at line 293 of file pytypes.h.

operator!=()

bool handle::operator!= ( const handle &  h ) const

inline

Definition at line 301 of file pytypes.h.

operator==()

bool handle::operator== ( const handle &  h ) const

inline

\rst Deprecated: Check that the underlying pointers are the same. Equivalent to obj1 is obj2 in Python. \endrst

Definition at line 299 of file pytypes.h.

ptr() [1/2]

PyObject*& handle::ptr ( )

inline

Definition at line 251 of file pytypes.h.

ptr() [2/2]

PyObject* handle::ptr ( ) const

inline

Return the underlying PyObject * pointer.

Definition at line 250 of file pytypes.h.

throw_gilstate_error()

void handle::throw_gilstate_error ( const std::string &  function_name ) const

inlineprivate

Definition at line 310 of file pytypes.h.

Member Data Documentation

m_ptr

PyObject* handle::m_ptr = nullptr

protected

Definition at line 306 of file pytypes.h.

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The documentation for this class was generated from the following files:

• pytypes.h
• cast.h