* Make function_record type subinterpreter safe
* Get rid of static state in implicit conversion
* style: pre-commit fixes
* Fix lambda
* Bump ABI because we added an internals member
* Set __module__ on the type instance to get rid of DepricationWarning
* Work around internal compiler error in CUDA by not using typedef
hopefully
* Make clang-tidy happy
* Use the same __module__ as pybind11_static_property
* style: pre-commit fixes
* Oops, find-replace error
* style: pre-commit fixes
* Move the once initialization to happen more behind the scenes
* Oops, need those casts...
* Undo implicit conversion change, will do a separate PR
* Use local_internals for function_record pointer to avoid ABI bump
* style: pre-commit fixes
* Get rid of this auto for readability
* Change back to using unqualified tp_name, set __module__ attribute, explicitly add Py_TPFLAGS_HEAPTYPE → does not resolve DeprecationWarning :-(
* Revert "Change back to using unqualified tp_name, set __module__ attribute, explicitly add Py_TPFLAGS_HEAPTYPE → does not resolve DeprecationWarning :-("
This reverts commit 9ccd6de9b7.
* Add Py_TPFLAGS_HEAPTYPE to be explicit (more readable).
* Remove obsolete PYBIND11_WARNING_DISABLE_...
* Make tp_plainname_impl, tp_qualname_impl more DRY
* Change PYBIND11_INTERNAL_MODULE_NAME → PYBIND11_DUMMY_MODULE_NAME
* Add a long comment to explain the tp_qualname_impl workaround.
* Rename local_internals::function_record → function_record_py_type
---------
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* Failing unit test
* Potential fix for the issue of re-importing a multi-phase module
- When a module is successfully imported and exec'd, save its handle in a dict in the interpreter state
- Use a special Py_mod_create slot to look in the cache and return the cached handle if it is in the cache
- Don't re-run the user exec function if the module is in the interpreter's cache (implying it was already successfully imported)
* Oops, need to inline these.
* Clang-Tidy fixes
* Oops, debug code
* Add xfail for this GraalPy bug
* Remove static from these function defs, it was a cut-and-paste error in the first place.
* Fix test comment
* Proper error handling
* Oops
* Split up this line, but still just ignore failure .. if the module doesn't have the right properties to check the cache then just allow exec to run.
* Clean up - already looked up the name, just use that.
* Some compilers complain if the pointer isn't taken here, weird.
* Allow attribute errors to be thrown here, will be converted to import errors by the exception handler.
* Remove bogus incref, unconditionally expect a __spec__.name on the module
* Add PR to test comment
* style: pre-commit fixes
---------
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* Replace static bool with thread-specific-storage to make this code sub-interpreter and free-threading safe.
* Make sure there is only one tss value in existence for this.
The previous code had multiple (one for every type pair, as this is a template function), which may have posed a problem for some platforms.
* Make set_flag in implicitly_convertible() non-copyable/movable
set_flag is an RAII guard for a thread-specific reentrancy flag.
Copying or moving it would risk double-resetting or rearming the flag,
breaking the protection. Disable copy/move constructors and assignment
operators to make this explicit.
* Minor cleanup to avoid venturing into UB territory.
* Experiment: Disable `~thread_specific_storage()` body when using GraalPy.
* Try the suggestion to only call TSS_free if the python interpreter is still active.
* Add IsFinalizing check
* Put this back to having a per-template-instance static
---------
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* Seems like 3.12 has concurrency issues when creating a subinterpreter, easiest workaround is just to lock during it.
* Only need this for PER_INTERPRETER_GIL
C++20 can be enabled while the C++ runtime is still much older so use the feature macro to check for it.
For example, we are using the latest clang with c++23 on SLES, while the gcc version is 7.
When compiling an application using pybind11 3.0.0, GCC 13.3.0 and
python 3.11.13 the following warning is emitted [1]:
In function 'PyObject* PyCFunction_GET_SELF(PyObject*)',
inlined from 'void pybind11::cpp_function::initialize_generic(unique_function_record&&, const char*, const std::type_info* const*, pybind11::size_t)' at /opt/conda/lib/python3.11/site-packages/pybind11/include/pybind11/pybind11.h:605:30:
/opt/conda/include/python3.11/cpython/methodobject.h:50:16: error: potential null pointer dereference [-Werror=null-dereference]
50 | return _Py_NULL;
| ^~~~~~~~
It stems form the fact that PyCFunction_GET_SELF can return a nullptr.
Let's fail in this case.
[1]: https://gitlab.com/tango-controls/pytango/-/jobs/10671972312#L570
* Update docs/changelog.md and change version to v3.0.0 (final)
* [skip ci] Add `|SPEC 4 — Using and Creating Nightly Wheels|` badge in main README.rst
* Add overload to enable `.def(py::init(&rtrn_shcp))`. Also uncomment `.def(py::init(&rtrn_uqcp))` and `.def(py::init(&rtrn_udcp))`, which happen to work already (not sure what change in the past made those work).
* Introduce `construct_from_shared_ptr()` helper for DRY-ness.
* Revert PR #5700 production code change (pybind11/detail/struct_smart_holder.h).
```
git checkout b19489145b2c7a117138632d624809dfb3b380bb~1 include/pybind11/detail/struct_smart_holder.h
```
* Introduce `get_internals().get_memory_guarded_delete()`
* [skip ci] Only pass around `memory::get_guarded_delete` function pointer.
* [skip ci] Change a variable name for internal consistency. Add 3 x NOTE: PYBIND11_INTERNALS_VERSION needs to be bumped if changes are made to this struct.
* Add comment: get_internals().get_memory_guarded_delete does not need with_internals()
* Traverse all DSOs to find memory::guarded_delete with matching RTTI.
* Add nullptr check to dynamic_cast overload.
Suggested by ChatGPT for these reasons:
* Prevents runtime RTTI lookups on nullptr.
* Helps avoid undefined behavior if users pass in nulls from failed casts or optional paths.
* Ensures consistent return value semantics and no accidental access to vtable.
* Improve smart_holder unique_ptr deleter compatibility checks across DSOs:
* Replace RTTI-based detection of std::default_delete<T> with a constexpr check to avoid RTTI reliance
* Add type_info_equal_across_dso_boundaries() fallback using type_info::name() for RTTI equality across macOS DSOs
* Rename related flags and functions for clarity (e.g., builtin → std_default)
* Improves ABI robustness and clarity of ownership checks in smart_holder
* Trivial renaming for internal consistency: builtin_delete → std_default_delete
* Add get_trampoline_self_life_support to detail::type_info (passes local testing).
* Polish previous commit slightly.
* [skip ci] Store memory::get_guarded_delete in `detail::type_info` instead of `detail::internals` (no searching across DSOs required).
* Revert change suggested by ChatGPT. After double-checking, ChatGPT agrees this isn't needed.
* Minor polishing.
* add support for const pointers in smart pointers
* use c++11 compatible code
* add template parameter in test
* Make the const-removal clearly visible. This simplifies the production code changes significantly.
For background see: https://claude.ai/share/4085d9ab-a859-44cc-bb56-450e472f817a
* test without leaks
* add namespace for test
* rename test
* fix test compilation
* using namespace test_const_only_smart_ptr;
* fix smartptr in test
* smaller test body
* move test
* style: pre-commit fixes
---------
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* chore: handle null for `py::scoped_critical_section`
* test: add tests for `py::scoped_critical_section`
* test: use assert instead of REQUIRE
* feat: enable faulthandler for pytest
* chore: use `__has_include(<barrier>)`
* fix: fix segmentation fault in test
* fix: test critical_section for no-gil only
* test: run new tests only
* test: ensure non-empty test selection
* fix: fix test critical_section
* fix: change Python 3.14.0b1/2 xfail tests to non-strict
* test: trigger gc manually
* test: mark xfail to `DynamicClass`
* Use `namespace test_scoped_critical_section_ns` (standard approach to guard against name clashes).
* Simplify changes in pybind11/critical_section.h and add test_nullptr_combinations()
* test: disable Python devmode in pytest
* test: add comprehensive comments for the tests
* test: add a summary comment for tests
* refactor: simpler impl
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---------
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* Refactor internals to use a holder that manages the PP
* Refactor internals to use a holder that manages the PP
* Fix cleanup/destruction issues.
* Fix one more destruction issue
Should now just be able to delete the internals PP on destruction
* Make clang-tidy happy
* Try to fix exception translators issue on certain platforms
Also fix a couple more pedantic warings
* Fix test, after internals is free'd it can come back at the same address
So instead, just make sure it was zero'd and don't try to compare the addresses.
Also a little code cleanup
* Comment tweak [skip ci]
* Switch to ifdef instead of if
* Re-enable subinterpreters in iOS
* style: pre-commit fixes
* Oops, this snuck in on merge
* fix: bump ABI version to 10
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---------
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* test: Added test case for visibility of common symbols across shared libraries
* style: pre-commit fixes
* tests: cmake target name fix
* tests: Added visibility test to ci
* tests: set the default visibility to hidden
* prototype/proof-of-concept fix: PYBIND11_EXPORT_GUARDED_DELETE
* Fix silly oversight: actually use PYBIND11_EXPORT_GUARDED_DELETE
* Update struct_smart_holder.h
* style: pre-commit fixes
* Update include/pybind11/detail/struct_smart_holder.h
* Update struct_smart_holder.h
* ci: fix addition to reusable-standard.yml
* Update CMakeLists.txt
* refactor: rename tests to test_cross_module_rtti
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---------
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* fix future type hints
Signed-off-by: Michael Carlstrom <rmc@carlstrom.com>
* style: pre-commit fixes
* remove unused var
Signed-off-by: Michael Carlstrom <rmc@carlstrom.com>
* remove union_helper
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* fix speelling error
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* base case for union_concat
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* style: pre-commit fixes
* add case for one descr
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* weakref and final test
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* Add acrpss_version_type_hint_checker
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* cleanup
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* style: pre-commit fixes
* remove test.pyi
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* use new unions and add fixture
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* timohl suggested cleanup
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* style: pre-commit fixes
* add missing auto
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* style: pre-commit fixes
* move operator| def
---------
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* feat: scoped_critical_section
Signed-off-by: Henry Schreiner <henryschreineriii@gmail.com>
* refactor: pull out to file
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* style: pre-commit fixes
* fix: GIL code in some compilers
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* fix: move to correct spot
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---------
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* refactor: use CPython macros to construct `PYBIND11_VERSION_HEX`
* docs: update release guide
* tests: add test to keep version values in sync
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* style: pre-commit fixes
* test: update version test
* test: update version test
* test: update version test
* chore: update code comments
* Update docs/release.rst
---------
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* First draft a subinterpreter embedding API
* Move subinterpreter tests to their own file
* Migrate subinterpreter tests to use the new embedded class.
* Add a test for moving subinterpreters across threads for destruction
And find a better way to make that work.
* Code organization
* Add a test which shows demostrates how gil_scoped interacts with sub-interpreters
* Add documentation for embeded sub-interpreters
* Some additional docs work
* Add some convenience accessors
* Add some docs cross references
* Sync some things that were split out into #5665
* Update subinterpreter docs example to not use the CPython api
* Fix pip test
* style: pre-commit fixes
* Fix MSVC warnings
I am surprised other compilers allowed this code with a deleted move ctor.
* Add some sub-headings to the docs
* Oops, make_unique is C++14 so remove it from the tests.
* I think this fixes the EndInterpreter issues on all versions.
It just has to be ifdef'd because it is slightly broken on 3.12, working well on 3.13, and kind of crashy on 3.14beta. These two verion ifdefs solve all the issues.
* Add a note about exceptions.
They contain Python object references and acquire the GIL, that means they are a danger with subinterpreters!
* style: pre-commit fixes
* Add try/catch to docs examples to match the tips
* Python 3.12 is very picky about this first PyThreadState
Try special casing the destruction on the same thread.
* style: pre-commit fixes
* Missed a rename in a ifdef block
* I think this test is causing problems in 3.12, so try ifdefing it to see if the problems go away.
* style: pre-commit fixes
* Document the 3.12 constraints with a warning
* Apply suggestions from code review
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* ci: add cpptest to the clang-tidy job
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* noexcept move operations
* Update include/pybind11/subinterpreter.h
std::memset
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---------
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* Move common code from PYBIND11_MODULE and PYBIND11_EMBEDDED_MODULE into one macro
The difference between the two is really small, almost all of the code was the same.
* Use a macro to make the forward decl correct and reduce code duplication
* Oops, extra semicolon
* Split up the macro into two so we can avoid the redundant decl
* Fix Python 3.8 type hints and add module prefix
These type hints are invalid in Python 3.8.
Add `typing.` prefix to remove ambiguity.
* style: pre-commit fixes
* Add module prefix to Union
* Rename macros
* Improve comment
* Comment out 3.8 type hint macros
Fixing this issue in Python 3.8 will require updating lots of tests. This can be added in a further pull request.
* Add Iterable module prefix
* Add module prefix to Iterator
* Add module prefix to Callable
* Re-add accidentally deleted brackets
* Add module prefix to Optional
* Add module prefix to Final
* Add module prefix to ClassVar
* Add module prefix to TypeGuard
* Add module prefix to TypeIs
* Add module prefix to NoReturn
* Add module prefix to Never
* Add module prefix to Literal
* Add module prefix to Callable
* Add module prefix to Sequence
* Add module prefix to Iterator
* style: pre-commit fixes
* Remove type hint macros
* style: pre-commit fixes
---------
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* Squashed prepv300/manuscript — 30b9c268aeb98308ea42aaccfd5fe454e173c6fc — 2025-03-30 14:56:03 -0700 [skip ci]
[Browse prepv300/manuscript tree](30b9c268ae)
[Browse prepv300/manuscript commits](30b9c268ae/)
* docs: update changelog
Signed-off-by: Henry Schreiner <henryschreineriii@gmail.com>
* docs: upgrade guide CMake suggestions
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* Explain type_caster_enum_type_enabled, copyable_holder_caster_shared_ptr_with_smart_holder_support_enabled, move_only_holder_caster_unique_ptr_with_smart_holder_support_enabled in Upgrade guide.
* Add a small section for py::bind_vector, py::bind_map & py::smart_holder
* Fix tiny oversight: Reference back to the current release v2.13 (not v2.12)
* Remove sentence: Using self._pybind11_conduit_v1_() ... should keep extension compatibility.
This isn't true, because we also modernized `PYBIND11_PLATFORM_ABI_ID`
(which I believe was absolutely necessary). I think it'll be too complicated
to explain that here, and there is a mention in the Upgrade guide.
* Changelog: combine #4953 and #5439
* Trivial whitespace/formatting fixes/enhancements.
* chore: add more to deprecation page
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* docs: update for recent additions
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* docs: fixes and set rc1 version
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* fix: support rc versions
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* Undo erroneous copilot change: We need to use `detail::enable_if_t`, for compatibility with C++11 and C++14.
* Empty lines cleanup.
* Rewording of "CMake support now defaults to ..." paragraph.
* Add missing backticks in upgrade guide.
* Try :ref:deprecated instead of :doc:deprecated
* docs: last bit of polish
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* Piggy-back trivial whitespace cleanup that was missed in PR #5669
---------
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* Move embedded modules to multiphase init
So that they too can support multi-interpreter and nogil tags
* Update the multiple interpreter test for embedded module changes
* Add a note to embedded module docs about the new tags
* Oops, missed a warning pop
* Remove unused variable
* Update ci.yml
* Fix this embedded GIL test for free-threading
* Oops, need to use ptr() here
* This test created a subinterpreter when PYBIND11_SUBINTERPRETER_SUPPORT was off
So the fix is really this test should not be run in these older versions at all.
The hang was a GIL issue between the subinterpreters during pybind11::exception::what().
* fix: standard mutex for 3.13t
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---------
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* ci: support Python 3.14
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* fix: Python 3.14 name change
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* tests: fix expected output to handle Python 3.14
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* fix: tighten CLI and add color on 3.14+
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* tests: ignore failure on 3.14.0b1
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* fix: support Python 3.14.0b1 with interperters
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* Update test_multiple_interpreters.py
* Update test_multiple_interpreters.py
* fix: new breakage for 3.14 fixed
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* fix: handle empty annotations 3.14
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* fix: Python 3.14 may not create the annotations dict
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* fix: use PyUnstable_IsImmortal
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* fix: use sys._is_immortal
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* tests: ignore large values for refcount too
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* style: pre-commit fixes
* ci: enable all free-threaded builds
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* fix: patch for embed
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* Revert "fix: patch for embed"
This reverts commit c4226a0671.
* ci: drop new 3.xt additions
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* fix: logic issue, also add some comments
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* Update include/pybind11/pytypes.h
---------
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* Fix Buffer type hint
collections.abc.Buffer was added in Python 3.12.
The previous behaviour should be used prior to this version.
* Fix comment
* Fix indentation
* style: pre-commit fixes
* Fix test
* Add missing import
* style: pre-commit fixes
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* Allow per-interpreter internals/local_internals
* Significant rewrite to avoid using thread_locals as much as possible.
Since we can avoid them by checking this atomic, the cmake config conditional shouldn't be necessary.
The slower path (with thread_locals and extra checks) only comes in when a second interpreter is actually instanciated.
* Add a test for per-interpreter GIL
Uses two extra threads to demonstrate that neither shares a GIL.
* Fix for nonconforming std::atomic constructors on some compilers
* style: pre-commit fixes
* Fix initializer to make MSVC happy.
* Switch to gil_scoped_acquire_simple, get rid of old copy of it from internals.h
* Use the PyThreadState's interp member rather than the thread state itself.
* Be more explicit about the type of the internalspp
* Suggested renamings and rewordings
* Rename find_internals_pp and change it to take in the state dict reference
* Use the old raise_from instead of pybind11_fail
* Move most of the internals initialization into its constructor.
* Move round_up_to_next_pow2 function upwards
* Remove redundant forward decl
* Add a python-driven subinterpreter test
* Disable the python subinterpreter test on emscripten
Can't load the native-built cpp modules.
* Switch the internals pointer pointer to a unique_ptr pointer
* Spelling
* Fix clang-tidy warning, compare pointer to nullptr
* Rename get_interpreter_counter to get_num_interpreters_seen
* Try simplifying the test's cmake set_target_properties
* Replace mod_* tags with a single tag w/enum
Update tests accordingly
* Add a test for shared-GIL (legacy) subinterpreters
* Update test to work around differences in the various versions of interpreters modules
* Fix unused parameter
* Rename tests and associated test modules.
* Switch get_internals_pp to a template function
* Rename curtstate to cur_tstate
* refactor: use simpler names
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* style: pre-commit fixes
* fix: return class, not enum
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* Have to join these threads to make sure they are totally done before the test returns.
* Wrap module_def initialization in a static so it only happens once.
If it happens concurrently in multiple threads, badness ensues....
* style: pre-commit fixes
---------
Signed-off-by: Henry Schreiner <henryschreineriii@gmail.com>
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Co-authored-by: Henry Schreiner <henryschreineriii@gmail.com>
Co-authored-by: Ralf W. Grosse-Kunstleve <rwgkio@gmail.com>
* Added weak_ptr test (currently failing)
* Cleanup
* [skip ci] Simplify test case.
* Add test_class_sp_trampoline_weak_ptr.cpp,py (using std::shared_ptr as holder). Tweak test_class_sh_trampoline_weak_ptr.py to pass, with `# THIS NEEDS FIXING` comment.
* Resolve clang-tidy errors
```
/__w/pybind11/pybind11/tests/test_class_sh_trampoline_weak_ptr.cpp:23:43: error: the parameter 'sp' is copied for each invocation but only used as a const reference; consider making it a const reference [performance-unnecessary-value-param,-warnings-as-errors]
23 | void set_wp(std::shared_ptr<VirtBase> sp) { wp = sp; }
| ^
| const &
4443 warnings generated.
```
```
/__w/pybind11/pybind11/tests/test_class_sp_trampoline_weak_ptr.cpp:23:43: error: the parameter 'sp' is copied for each invocation but only used as a const reference; consider making it a const reference [performance-unnecessary-value-param,-warnings-as-errors]
23 | void set_wp(std::shared_ptr<VirtBase> sp) { wp = sp; }
| ^
| const &
4430 warnings generated.
```
* PYPY, GRAALPY: skip last part of test_weak_ptr_base
* Rename test_weak_ptr_base → test_weak_ptr_owner
* Add SpOwner, test_with_sp_owner, test_with_sp_and_wp_owners
* Modify py::trampoline_self_life_support semantics: if trampoline class does not inherit from this class, preserve established Inheritance Slicing behavior.
rwgk reached this point with the help of ChatGPT:
* https://chatgpt.com/share/68056498-7d94-8008-8ff0-232e2aba451c
The only production code change in this commit is:
```
diff --git a/include/pybind11/detail/type_caster_base.h b/include/pybind11/detail/type_caster_base.h
index d4f9a41e..f3d45301 100644
--- a/include/pybind11/detail/type_caster_base.h
+++ b/include/pybind11/detail/type_caster_base.h
@@ -776,6 +776,14 @@ struct load_helper : value_and_holder_helper {
if (released_ptr) {
return std::shared_ptr<T>(released_ptr, type_raw_ptr);
}
+ auto *self_life_support
+ = dynamic_raw_ptr_cast_if_possible<trampoline_self_life_support>(type_raw_ptr);
+ if (self_life_support == nullptr) {
+ std::shared_ptr<void> void_shd_ptr = hld.template as_shared_ptr<void>();
+ std::shared_ptr<T> to_be_released(void_shd_ptr, type_raw_ptr);
+ vptr_gd_ptr->released_ptr = to_be_released;
+ return to_be_released;
+ }
std::shared_ptr<T> to_be_released(
type_raw_ptr, shared_ptr_trampoline_self_life_support(loaded_v_h.inst));
vptr_gd_ptr->released_ptr = to_be_released;
```
* Remove debug printf in include/pybind11/pybind11.h
* Resolve MSVC error
```
11>D:\a\pybind11\pybind11\tests\test_class_sp_trampoline_weak_ptr.cpp(44,50): error C2220: the following warning is treated as an error [D:\a\pybind11\pybind11\build\tests\pybind11_tests.vcxproj]
11>D:\a\pybind11\pybind11\tests\test_class_sp_trampoline_weak_ptr.cpp(44,50): warning C4458: declaration of 'sp' hides class member [D:\a\pybind11\pybind11\build\tests\pybind11_tests.vcxproj]
D:\a\pybind11\pybind11\tests\test_class_sp_trampoline_weak_ptr.cpp(54,31):
see declaration of 'pybind11_tests::class_sp_trampoline_weak_ptr::SpOwner::sp'
```
* [skip ci] Undo the production code change under 4638e017b6
Also undo the corresponding test change in test_class_sh_trampoline_weak_ptr.py
But keep all extra debugging code for now.
* [skip ci] Introduce lambda in `WpOwner::set_wp` bindings, but simply cast to `std::shared_ptr<VirtBase>` for now.
* Add `py::potentially_slicing_shared_ptr()`
* Add `type_id<T>()` to `py::potentially_slicing_shared_ptr()` error message and add test.
* test_potentially_slicing_shared_ptr.cpp,py (for smart_holder only)
* Generalize test_potentially_slicing_shared_ptr.cpp,py for testing with smart_holder and std::shared_ptr as holder.
* Add back test_potentially_slicing_shared_ptr_not_convertible_error(), it got lost accidentally in commit 56d23dc478
* Add simple trampoline state assertions.
* Resolve clang-tidy errors.
```
/__w/pybind11/pybind11/tests/test_potentially_slicing_shared_ptr.cpp:30:9: error: 'magic_token' should be initialized in a member initializer of the constructor [cppcoreguidelines-prefer-member-initializer,-warnings-as-errors]
29 | trampoline_is_alive_simple(const trampoline_is_alive_simple &other) {
| : magic_token(other.magic_token)
30 | magic_token = other.magic_token;
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/__w/pybind11/pybind11/tests/test_potentially_slicing_shared_ptr.cpp:33:9: error: 'magic_token' should be initialized in a member initializer of the constructor [cppcoreguidelines-prefer-member-initializer,-warnings-as-errors]
32 | trampoline_is_alive_simple(trampoline_is_alive_simple &&other) noexcept {
| : magic_token(other.magic_token)
33 | magic_token = other.magic_token;
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
```
* Add a (long) C++ comment for py::potentially_slicing_shared_ptr<>()
* [skip ci] Add new "Avoiding Inheritance Slicing and ``std::weak_ptr`` surprises" section in advanced/classes.rst
* [skip ci] Add introductory comment to test_potentially_slicing_shared_ptr.py
* Minimal (!) changes to have py::potentially_slicing_weak_ptr<T>(handle) as the public API. For CI testing, before changing the names around more widely, and the documentation.
* Rename test_potentially_slicing_shared_ptr.cpp,py → test_potentially_slicing_weak_ptr.cpp,py
* Update docs/advanced/classes.rst and C++ comments → potentially_slicing_weak_ptr
* Write "shared_ptr" instead of just "pointer" in a couple places in docs/advanced/classes.rst
* Add comment for force_potentially_slicing_shared_ptr in type_caster_base.h, to make a direct connection py::potentially_slicing_weak_ptr
---------
Co-authored-by: Ralf W. Grosse-Kunstleve <rgrossekunst@nvidia.com>
