Hi!
Since quite a long time, #11115 is in need of a review. I think that
it provides quite useful stuff and should thus soon be added to Sage.
Currently, cached_method is implemented in Python, and can be so
frustratingly slow that it is faster to not cache simple routines, or
to implement a cache manually.
With #11115, cached_method is rewritten in Cython and is so fast that
it beats any Python method.
Examples: A Python method
def is_exact(self):
return True
needs 690 ns on my machine, and
def prec(self):
return self._prec
even takes about 2.1 µs. Prepending @cached_method to these methods
makes them use not more than 375 ns on the same machine
So, cached_method is both comfortable and fast.
Currently, a cached_method (that may be inherited from the category
framework) does not work on instances that do not allow attribute
access (the cache would break). #11115 makes it work on all parents.
Currently, cached_method can not be used at all in Cython code. Now,
it can (with some rough edges), even though a hand-written cache in
Cython is still faster (but less comfortable).
Currently, there is a class ClearCacheOnPickle, that avoids to store
the cached function values when pickling an instance. However, that
class had no example and did actually not work. #11115 provides a
working implementation.
Also, #11115 is currently the only dependency that prevents #11068
from being merged, that adds basic support for one- and two-sided
ideals in non-commutative rings to Sage.
Hence, I'd appreciate a review!
Best regards,
Simon
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