mirror of https://github.com/sgoudham/Enso-Bot.git
You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
39 lines
1.3 KiB
Python
39 lines
1.3 KiB
Python
from ctypes import c_void_p
|
|
|
|
|
|
class CPointerBase:
|
|
"""
|
|
Base class for objects that have a pointer access property
|
|
that controls access to the underlying C pointer.
|
|
"""
|
|
_ptr = None # Initially the pointer is NULL.
|
|
ptr_type = c_void_p
|
|
destructor = None
|
|
null_ptr_exception_class = AttributeError
|
|
|
|
@property
|
|
def ptr(self):
|
|
# Raise an exception if the pointer isn't valid so that NULL pointers
|
|
# aren't passed to routines -- that's very bad.
|
|
if self._ptr:
|
|
return self._ptr
|
|
raise self.null_ptr_exception_class('NULL %s pointer encountered.' % self.__class__.__name__)
|
|
|
|
@ptr.setter
|
|
def ptr(self, ptr):
|
|
# Only allow the pointer to be set with pointers of the compatible
|
|
# type or None (NULL).
|
|
if not (ptr is None or isinstance(ptr, self.ptr_type)):
|
|
raise TypeError('Incompatible pointer type: %s.' % type(ptr))
|
|
self._ptr = ptr
|
|
|
|
def __del__(self):
|
|
"""
|
|
Free the memory used by the C++ object.
|
|
"""
|
|
if self.destructor and self._ptr:
|
|
try:
|
|
self.destructor(self.ptr)
|
|
except (AttributeError, ImportError, TypeError):
|
|
pass # Some part might already have been garbage collected
|