[DEMO] Add .get_capsule_for_scipy_LowLevelCallable() method in function_record_pyobject.h
#5585
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…ch")`
macos-13 • brew install llvm
```
/Users/runner/work/pybind11/pybind11/include/pybind11/detail/function_record_pyobject.h:40:26: error: cast from 'PyObject *(*)(PyObject *, PyObject *, PyObject *)' (aka '_object *(*)(_object *, _object *, _object *)') to 'PyCFunction' (aka '_object *(*)(_object *, _object *)') converts to incompatible function type [-Werror,-Wcast-function-type-mismatch]
40 | = {{"__reduce_ex__", (PyCFunction) reduce_ex_impl, METH_VARARGS | METH_KEYWORDS, nullptr},
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
```
This reverts commit 0da8312.
```
/__w/pybind11/pybind11/include/pybind11/detail/function_record_pyobject.h:215:10: error: implicit conversion 'int' -> 'bool' [readability-implicit-bool-conversion,-warnings-as-errors]
215 | if (!PyArg_ParseTupleAndKeywords(args, kwargs, "s", const_cast<char **>(kwlist), &signature)) {
| ~^
| == 0
/__w/pybind11/pybind11/include/pybind11/detail/function_record_pyobject.h:230:5: error: 'auto cap' can be declared as 'auto *cap' [readability-qualified-auto,-warnings-as-errors]
230 | auto cap = reinterpret_cast<capture *>(&rec->data);
| ^~~~
| auto *
```
…ethod' object has no attribute '__self__'
…he function pointer. Also make the function a bit more unique (square → square21) for easier pin-pointing. Related ChatGPT conversation regarding `extern "C"`: https://chatgpt.com/share/67e6481e-0994-8008-a64a-a07ce2b781ea
…_LowLevelCallable_NO_TYPE_SAFETY. Make the reinterpret_cast from function pointer to void pointer explicit for clarity.
…d11/functional.h, pybind11/detail/function_record_pyobject.h Also `static_assert(std::is_standard_layout<capture>::value, "")` in all three places. ChatGPT conversation guiding gh-rwgk through the subtle changes: https://chatgpt.com/share/67e66f74-cc80-8008-8b19-1d02e86acf71
…_capsule_for_scipy_LowLevelCallable_NO_ABI_OR_TYPE_SAFETY`)
…PTIMIZATIONS macro, for readability/maintainability.
…D11_DETAIL_FUNCTION_RECORD_ABI_ID, PYBIND11_INTERNALS_ID
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Description
This was an experiment/demo:
This works for any pybind11-wrapped function that is "stateless", but ABI safety and type safety are missing completely.
Slightly safer alternatives are easy to implement. See e.g.
Suggested changelog entry: