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-\chapter{Reference Counting \label{countingRefs}}
-
-
-The macros in this section are used for managing reference counts
-of Python objects.
-
-
-\begin{cfuncdesc}{void}{Py_INCREF}{PyObject *o}
-  Increment the reference count for object \var{o}.  The object must
-  not be \NULL; if you aren't sure that it isn't \NULL, use
-  \cfunction{Py_XINCREF()}.
-\end{cfuncdesc}
-
-\begin{cfuncdesc}{void}{Py_XINCREF}{PyObject *o}
-  Increment the reference count for object \var{o}.  The object may be
-  \NULL, in which case the macro has no effect.
-\end{cfuncdesc}
-
-\begin{cfuncdesc}{void}{Py_DECREF}{PyObject *o}
-  Decrement the reference count for object \var{o}.  The object must
-  not be \NULL; if you aren't sure that it isn't \NULL, use
-  \cfunction{Py_XDECREF()}.  If the reference count reaches zero, the
-  object's type's deallocation function (which must not be \NULL) is
-  invoked.
-
-  \warning{The deallocation function can cause arbitrary Python code
-  to be invoked (e.g. when a class instance with a \method{__del__()}
-  method is deallocated).  While exceptions in such code are not
-  propagated, the executed code has free access to all Python global
-  variables.  This means that any object that is reachable from a
-  global variable should be in a consistent state before
-  \cfunction{Py_DECREF()} is invoked.  For example, code to delete an
-  object from a list should copy a reference to the deleted object in
-  a temporary variable, update the list data structure, and then call
-  \cfunction{Py_DECREF()} for the temporary variable.}
-\end{cfuncdesc}
-
-\begin{cfuncdesc}{void}{Py_XDECREF}{PyObject *o}
-  Decrement the reference count for object \var{o}.  The object may be
-  \NULL, in which case the macro has no effect; otherwise the effect
-  is the same as for \cfunction{Py_DECREF()}, and the same warning
-  applies.
-\end{cfuncdesc}
-
-\begin{cfuncdesc}{void}{Py_CLEAR}{PyObject *o}
-  Decrement the reference count for object \var{o}.  The object may be
-  \NULL, in which case the macro has no effect; otherwise the effect
-  is the same as for \cfunction{Py_DECREF()}, except that the argument
-  is also set to \NULL.  The warning for \cfunction{Py_DECREF()} does
-  not apply with respect to the object passed because the macro
-  carefully uses a temporary variable and sets the argument to \NULL
-  before decrementing its reference count.
-
-  It is a good idea to use this macro whenever decrementing the value
-  of a variable that might be traversed during garbage collection.
-
-\versionadded{2.4}
-\end{cfuncdesc}
-
-
-The following functions are for runtime dynamic embedding of Python:
-\cfunction{Py_IncRef(PyObject *o)}, \cfunction{Py_DecRef(PyObject *o)}.
-They are simply exported function versions of \cfunction{Py_XINCREF()} and 
-\cfunction{Py_XDECREF()}, respectively.
-
-The following functions or macros are only for use within the
-interpreter core: \cfunction{_Py_Dealloc()},
-\cfunction{_Py_ForgetReference()}, \cfunction{_Py_NewReference()}, as
-well as the global variable \cdata{_Py_RefTotal}.