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Inherit __richcmp__ and __cmp__ in subclasses of Element #18329

Closed jdemeyer closed 9 years ago

jdemeyer commented 9 years ago

Use the __typeinit__ mechanism introduced by #18330 to inherit __cmp__ and __richcmp__ even if those would not be inherited by default.

Upstream patch added: https://github.com/cython/cython/pull/383

Upstream: Fixed upstream, but not in a stable release.

CC: @jpflori

Component: coercion

Author: Jeroen Demeyer

Branch: f6058e7

Reviewer: Jean-Pierre Flori

Issue created by migration from https://trac.sagemath.org/ticket/18329

jdemeyer commented 9 years ago

Branch: u/jdemeyer/inherit_richcompare

jdemeyer commented 9 years ago

Dependencies: #17890, #18321, #18322, #18330

jdemeyer commented 9 years ago

Commit: 3bb7361

jdemeyer commented 9 years ago

Last 10 new commits:

1ad339bImplement _rich_to_bool as inline function instead of member function
17bd067Merge tag '6.7.beta2' into t/17890/ticket/17890
313a400Optimize rich_to_bool_sgn
629f6a5Improve comparisons for permutation groups
0d1e049Improve _richcmp and documentation
39273f1Fix doctest formatting
04570b3Fix bad doctest in etaproducts
3976f2cAdd pointers for special uses of __richcmp__
d977150Merge remote-tracking branch 'origin/u/jdemeyer/ticket/17890' into u/jdemeyer/don_t_cimport_type
3bb7361Add hook for PyType_Ready
jdemeyer commented 9 years ago

Changed branch from u/jdemeyer/inherit_richcompare to none

jdemeyer commented 9 years ago

Changed dependencies from #17890, #18321, #18322, #18330 to #18321, #18322, #18330

jdemeyer commented 9 years ago

Description changed:

--- 
+++ 
@@ -1 +1 @@
-
+Use the `__typeinit__` mechanism introduced by #18330 to inherit `__cmp__` and `__richcmp__` even if those would not be inherited by default.
jdemeyer commented 9 years ago

Changed commit from 3bb7361 to none

jdemeyer commented 9 years ago

Branch: u/jdemeyer/ticket/18329

jdemeyer commented 9 years ago

New commits:

5d4b11eDon't cimport "type"
bb98fd0_cmp should try `_richcmp_` if `_cmp_` failed
30fe462Cython metaclass support
d4ba872Add check for tp_basicsize
3ec2842Revert changes to coerce_dict
2698d89Merge commit '5d4b11e4ed2b4053290386b87f666c88bb606782'; commit 'bb98fd07ee04b18a4ec329aeb2bf061dab4f7d6d'; commit '3ec2842529f4aa7763b2db0a7c6556c5bb437c14' into ticket/18329
db60d48Meteclass for inheriting comparison functions
jdemeyer commented 9 years ago

Commit: db60d48

jdemeyer commented 9 years ago

Changed dependencies from #18321, #18322, #18330 to #18321, #18322, #18330, #18380

7ed8c4ca-6d56-4ae9-953a-41e42b4ed313 commented 9 years ago

Branch pushed to git repo; I updated commit sha1. This was a forced push. New commits:

4073a17Meteclass for inheriting comparison functions
7ed8c4ca-6d56-4ae9-953a-41e42b4ed313 commented 9 years ago

Changed commit from db60d48 to 4073a17

7ed8c4ca-6d56-4ae9-953a-41e42b4ed313 commented 9 years ago

Branch pushed to git repo; I updated commit sha1. This was a forced push. New commits:

8f60acbAdd class CombinatorialElement
d826520Use LazyFormat for `_cmp_` exception
ac9ca1cUpdate comment
6e6870bAdd some needed casts
bc4d957Remove TypeInitMetaclass, add some documentation
70908cbComment
19f3337Merge commit '5d4b11e4ed2b4053290386b87f666c88bb606782'; commit 'ac9ca1c83737253b380a79cde33b4908a51d0ead'; commit '70908cbbaa5b4ec6c6f5dc7332d0f7c1379b511e' into HEAD
3481133Metaclass for inheriting comparison functions
7ed8c4ca-6d56-4ae9-953a-41e42b4ed313 commented 9 years ago

Changed commit from 4073a17 to 3481133

7ed8c4ca-6d56-4ae9-953a-41e42b4ed313 commented 9 years ago

Changed commit from 3481133 to 6c712ef

7ed8c4ca-6d56-4ae9-953a-41e42b4ed313 commented 9 years ago

Branch pushed to git repo; I updated commit sha1. This was a forced push. New commits:

6c712efMetaclass for inheriting comparison functions
jdemeyer commented 9 years ago

Changed dependencies from #18321, #18322, #18330, #18380 to #18321, #18322, #18330, #18380, #18387

jdemeyer commented 9 years ago
comment:10

Almost there :-)

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----------------------------------------------------------------------
7ed8c4ca-6d56-4ae9-953a-41e42b4ed313 commented 9 years ago

Changed commit from 6c712ef to 1ba4030

7ed8c4ca-6d56-4ae9-953a-41e42b4ed313 commented 9 years ago

Branch pushed to git repo; I updated commit sha1. This was a forced push. New commits:

1ba4030Metaclass for inheriting comparison functions
7ed8c4ca-6d56-4ae9-953a-41e42b4ed313 commented 9 years ago

Branch pushed to git repo; I updated commit sha1. This was a forced push. New commits:

96886e9Metaclass for inheriting comparison functions
7ed8c4ca-6d56-4ae9-953a-41e42b4ed313 commented 9 years ago

Changed commit from 1ba4030 to 96886e9

jdemeyer commented 9 years ago

Changed dependencies from #18321, #18322, #18330, #18380, #18387 to #18321, #18322, #18330, #18380, #18387, #18388

jdemeyer commented 9 years ago

Changed dependencies from #18321, #18322, #18330, #18380, #18387, #18388 to #18321, #18322, #18330, #18380, #18387, #18388, #18389

7ed8c4ca-6d56-4ae9-953a-41e42b4ed313 commented 9 years ago

Changed commit from 96886e9 to 9c8c73f

7ed8c4ca-6d56-4ae9-953a-41e42b4ed313 commented 9 years ago

Branch pushed to git repo; I updated commit sha1. This was a forced push. New commits:

9c8c73fMetaclass for inheriting comparison functions
7ed8c4ca-6d56-4ae9-953a-41e42b4ed313 commented 9 years ago

Changed commit from 9c8c73f to 381b844

7ed8c4ca-6d56-4ae9-953a-41e42b4ed313 commented 9 years ago

Branch pushed to git repo; I updated commit sha1. This was a forced push. New commits:

381b844Metaclass for inheriting comparison functions
7ed8c4ca-6d56-4ae9-953a-41e42b4ed313 commented 9 years ago

Changed commit from 381b844 to c27cb6b

7ed8c4ca-6d56-4ae9-953a-41e42b4ed313 commented 9 years ago

Branch pushed to git repo; I updated commit sha1. This was a forced push. New commits:

c27cb6bMetaclass for inheriting comparison functions
7ed8c4ca-6d56-4ae9-953a-41e42b4ed313 commented 9 years ago

Changed commit from c27cb6b to 0bfb7e1

7ed8c4ca-6d56-4ae9-953a-41e42b4ed313 commented 9 years ago

Branch pushed to git repo; I updated commit sha1. This was a forced push. New commits:

c448299Fix comparison for MPComplexField
39a25b9Merge tag '6.7' into HEAD
0bfb7e1Metaclass for inheriting comparison functions
7ed8c4ca-6d56-4ae9-953a-41e42b4ed313 commented 9 years ago

Branch pushed to git repo; I updated commit sha1. This was a forced push. New commits:

36900faMetaclass for inheriting comparison functions
7ed8c4ca-6d56-4ae9-953a-41e42b4ed313 commented 9 years ago

Changed commit from 0bfb7e1 to 36900fa

jdemeyer commented 9 years ago
comment:20

This now passes all doctests. All it needs now is some more documentation and testing.

jdemeyer commented 9 years ago

Changed dependencies from #18321, #18322, #18330, #18380, #18387, #18388, #18389 to #18389

7ed8c4ca-6d56-4ae9-953a-41e42b4ed313 commented 9 years ago

Branch pushed to git repo; I updated commit sha1. This was a forced push. New commits:

69f0325Metaclass for inheriting comparison functions
7ed8c4ca-6d56-4ae9-953a-41e42b4ed313 commented 9 years ago

Changed commit from 36900fa to 69f0325

7ed8c4ca-6d56-4ae9-953a-41e42b4ed313 commented 9 years ago

Branch pushed to git repo; I updated commit sha1. This was a forced push. New commits:

ce032bdMetaclass for inheriting comparison functions
7ed8c4ca-6d56-4ae9-953a-41e42b4ed313 commented 9 years ago

Changed commit from 69f0325 to ce032bd

jdemeyer commented 9 years ago

Changed dependencies from #18389 to none

7ed8c4ca-6d56-4ae9-953a-41e42b4ed313 commented 9 years ago

Branch pushed to git repo; I updated commit sha1. This was a forced push. New commits:

4b08519Metaclass for inheriting comparison functions
7ed8c4ca-6d56-4ae9-953a-41e42b4ed313 commented 9 years ago

Changed commit from ce032bd to 4b08519

simon-king-jena commented 9 years ago
comment:27

Can you tell how it actually works?

Background of my question: I was about to open a ticket for "using Cython and the coercion model on combinatorial free modules". When I searched "cython combinatorial free module" on trac, your ticket was among the first hits. And of course, when cythoning the elements of a combinatorial free module, __cmp__ and __richcmp__ would still be copied rather than inherited from sage.structure.element.

jdemeyer commented 9 years ago
comment:28

Replying to @simon-king-jena:

Can you tell how it actually works?

There are two things you need to know:

  1. The Cython "metaclass" mechanism implemented in #18330. This is similar to but not the same as a Python metaclass. It is a mechanism to change the type() of a Cython extension type and call the __init__ method (but not __new__!) of the metaclass. Using the C preprocessor, a hook to implement this is added which is called whenever a Cython extension type is created.

  2. This ticket uses that mechanism to manually inherit the tp_compare and tp_richcompare slots of extension types, see the code in src/sage/misc/inherit_comparison.pyx in the branch.

And of course, when cythoning the elements of a combinatorial free module, __cmp__ and __richcmp__ would still be copied rather than inherited from sage.structure.element.

What do you mean with "would still be copied"? I don't understand what you're trying to say.

simon-king-jena commented 9 years ago
comment:29

Replying to @jdemeyer:

Replying to @simon-king-jena:

Can you tell how it actually works?

There are two things you need to know:

  1. The Cython "metaclass" mechanism implemented in #18330. This is similar to but not the same as a Python metaclass. It is a mechanism to change the type() of a Cython extension type and call the __init__ method (but not __new__!) of the metaclass. Using the C preprocessor, a hook to implement this is added which is called whenever a Cython extension type is created.

OK, I should have a look at that.

  1. This ticket uses that mechanism to manually inherit the tp_compare and tp_richcompare slots of extension types, see the code in src/sage/misc/inherit_comparison.pyx in the branch.

I still don't understand what it is supposed to mean. What do you mean by "manually inherit"?

And of course, when cythoning the elements of a combinatorial free module, __cmp__ and __richcmp__ would still be copied rather than inherited from sage.structure.element.

What do you mean with "would still be copied"? I don't understand what you're trying to say.

See the comments in sage.structure.element:

    ####################################################################
    # For a derived Cython class, you **must** put the __richcmp__
    # method below in your subclasses, in order for it to take
    # advantage of the above generic comparison code.
    #
    # You must also define either _cmp_ (if your subclass is totally
    # ordered), _richcmp_ (if your subclass is partially ordered), or
    # both (if your class has both a total order and a partial order,
    # or if that gives better performance).
    #
    # Rich comparisons (like a < b) will default to using _richcmp_,
    # three-way comparisons (like cmp(a,b)) will default to using
    # _cmp_. But if you define just one of _richcmp_ and _cmp_, it will
    # be used for all kinds of comparisons.
    #
    # In the _cmp_ and _richcmp_ methods, you can assume that both
    # arguments have identical parents.
    ####################################################################

My understanding was that with the ticket here it would in future NOT be needed to copy the __cmp__ and __richcmp__ methods.

jdemeyer commented 9 years ago
comment:30

Replying to @simon-king-jena:

  1. This ticket uses that mechanism to manually inherit the tp_compare and tp_richcompare slots of extension types, see the code in src/sage/misc/inherit_comparison.pyx in the branch.

I still don't understand what it is supposed to mean. What do you mean by "manually inherit"?

An extension type with the InheritComparisonMetaclass "metaclass" will inherit __cmp__ and __richcmp__ from its base class if neither __cmp__ nor __richcmp__ is defined.

In practice, it means that we no longer need the boilerplate code

def __richcmp__(left, right, int op):
    return (<Element>left)._richcmp(right, op)

def __cmp__(left, right):
    return (<Element>left)._cmp(right)

in subclasses of Element since those will be inherited from Element.

jdemeyer commented 9 years ago
comment:31

Replying to @simon-king-jena:

My understanding was that with the ticket here it would in future NOT be needed to copy the __cmp__ and __richcmp__ methods.

Exactly.