RESOLVED FIXED 229148
[webkitcorepy] Add CallByNeed object 
https://bugs.webkit.org/show_bug.cgi?id=229148
Summary [webkitcorepy] Add CallByNeed object
Jonathan Bedard
Reported 2021-08-16 09:31:52 PDT
It's often the case that we want to defer the computation of an object until we actually need that object. We should add a small wrapper object that allows us to do this in webkitcorepy.
Attachments
Patch (8.36 KB, patch)
2021-08-16 09:43 PDT, Jonathan Bedard 		no flags
DetailsFormatted DiffDiff
Patch (8.31 KB, patch)
2021-08-18 08:24 PDT, Jonathan Bedard 		no flags
DetailsFormatted DiffDiff
Show Obsolete (1) View All Add attachment proposed patch, testcase, etc.
Jonathan Bedard
Comment 1 2021-08-16 09:33:27 PDT
<rdar://problem/81817705>
Jonathan Bedard
Comment 2 2021-08-16 09:43:09 PDT
Created attachment 435612 [details] Patch
dewei_zhu
Comment 3 2021-08-17 16:34:08 PDT
Comment on attachment 435612 [details] Patch View in context: https://bugs.webkit.org/attachment.cgi?id=435612&action=review > Tools/Scripts/libraries/webkitcorepy/webkitcorepy/defer.py:24 > +class Defer(object): It might cause confusion with "Deferred" in twisted module, which is more about async operation. For this one, we want to defer the evaluation of 'callback', this is more like lazily evaluated. This also limits the callback to be a callable that takes no argument, would that work for what it's designed for? > Tools/Scripts/libraries/webkitcorepy/webkitcorepy/tests/defer_unittest.py:34 > + Maybe we also want to have a test case that the evaluation is actually deferred. value = [] d = Defer(lambda: value.append('foo')) self.assertEqual(len(value), 0) d.value self.assertEqual(len(value), 1) self.assertEqual(value[0], 'foo').
Jonathan Bedard
Comment 4 2021-08-18 08:24:17 PDT
Created attachment 435768 [details] Patch
Jonathan Bedard
Comment 5 2021-08-18 09:34:09 PDT
Committed r281191 (240635@main): <https://commits.webkit.org/240635@main>
Note You need to log in before you can comment on or make changes to this bug.