mirror of
https://github.com/PiBrewing/craftbeerpi4.git
synced 2024-11-10 09:17:48 +01:00
35 lines
1 KiB
Cython
35 lines
1 KiB
Cython
cdef class reify:
|
|
"""Use as a class method decorator. It operates almost exactly like
|
|
the Python `@property` decorator, but it puts the result of the
|
|
method it decorates into the instance dict after the first call,
|
|
effectively replacing the function it decorates with an instance
|
|
variable. It is, in Python parlance, a data descriptor.
|
|
|
|
"""
|
|
|
|
cdef object wrapped
|
|
cdef object name
|
|
|
|
def __init__(self, wrapped):
|
|
self.wrapped = wrapped
|
|
self.name = wrapped.__name__
|
|
|
|
@property
|
|
def __doc__(self):
|
|
return self.wrapped.__doc__
|
|
|
|
def __get__(self, inst, owner):
|
|
try:
|
|
try:
|
|
return inst._cache[self.name]
|
|
except KeyError:
|
|
val = self.wrapped(inst)
|
|
inst._cache[self.name] = val
|
|
return val
|
|
except AttributeError:
|
|
if inst is None:
|
|
return self
|
|
raise
|
|
|
|
def __set__(self, inst, value):
|
|
raise AttributeError("reified property is read-only")
|