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rianhunter opened this issue Nov 13, 2023 · 3 comments · Fixed by #112018
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Provide ctypes.memoryview_at() #112015

rianhunter opened this issue Nov 13, 2023 · 3 comments · Fixed by #112018
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stdlib Python modules in the Lib dir topic-ctypes type-feature A feature request or enhancement

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@rianhunter
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rianhunter commented Nov 13, 2023 •
edited by bedevere-app bot
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Feature or enhancement

Proposal:

It should be possible to easily make memoryview objects from pointer-able ctypes objects with an arbitrary length. In the same way we can currently use ctypes.string_at() to create bytes objects. The advantage of using memoryview objects is that we can elide a buffer copy.

import ctypes
a = (ctypes.c_ubyte * 10)()
ctypes.buffer_at(a, 10, True)[0] = 1
assert a[0] == 1
a[0] = 2
assert ctypes.buffer_at(a, 10, True)[0] == 2

Has this already been discussed elsewhere?

This is a minor feature, which does not need previous discussion elsewhere

Links to previous discussion of this feature:

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@rianhunter rianhunter added the type-feature A feature request or enhancement label Nov 13, 2023
This was referenced Nov 13, 2023
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@iritkatriel iritkatriel added the stdlib Python modules in the Lib dir label Nov 27, 2023
@rianhunter
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Abandoned

@ncoghlan
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@encukou is taking up work on the associated PR. Thanks for taking it this far @rianhunter!

@ncoghlan ncoghlan reopened this Sep 26, 2024
@ncoghlan ncoghlan changed the title Provide ctypes.buffer_at() Provide ctypes.memoryview_at() Sep 26, 2024
encukou added a commit that referenced this issue Jan 3, 2025
@rianhunter @serhiy-storchaka
@encukou @picnixz
gh-112015: Implement ctypes.memoryview_at() (GH-112018)
b4f799b 
Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>
Co-authored-by: Petr Viktorin <encukou@gmail.com>
Co-authored-by: Bénédikt Tran <10796600+picnixz@users.noreply.github.com>
@encukou
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encukou commented Jan 3, 2025

And it's in!
Thank you @rianhunter for the proposal and implementation, and all the reviewers for their insights.

WolframAlph pushed a commit to WolframAlph/cpython that referenced this issue Jan 4, 2025
@rianhunter @serhiy-storchaka
@encukou @picnixz @WolframAlph
pythongh-112015: Implement ctypes.memoryview_at() (pythonGH-112018)
b3d84e3 
Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>
Co-authored-by: Petr Viktorin <encukou@gmail.com>
Co-authored-by: Bénédikt Tran <10796600+picnixz@users.noreply.github.com>
srinivasreddy pushed a commit to srinivasreddy/cpython that referenced this issue Jan 8, 2025
@rianhunter @serhiy-storchaka
@encukou @picnixz @srinivasreddy
pythongh-112015: Implement ctypes.memoryview_at() (pythonGH-112018)
8f2cce6 
Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>
Co-authored-by: Petr Viktorin <encukou@gmail.com>
Co-authored-by: Bénédikt Tran <10796600+picnixz@users.noreply.github.com>
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gh-112015: Implement ctypes.memoryview_at() rianhunter/cpython
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@rianhunter @encukou @ncoghlan @iritkatriel @serhiy-storchaka