Tiny Proof Of Concept: type_fingerprint() to support safely passing C++ pointers between Python extensions.

[rwgk]

Description

This PR is only to have a public record of the simple idea.

High-level idea: Pass C++ pointers via Python capsules between any wrapping system (SWIG, pybind11, nanobind, ..., manually written).

All those systems would have to standardize on

• the same "finger print",

• names for methods to request a Python capsule (e.g. __cpp_raw_ptr__, __cpp_unique_ptr__, __cpp_shared_ptr__).

Suggested changelog entry:

[rwgk]

Quick overview, mostly just because it was easy.

Input was logs_28611.zip

$ grep SKIPPED.*SHOW *.txt | sed 's/^[1-9][0-9]*_*//' | sed 's/\.txt:.*SHOW: /@/' | python3 ~/get_type_fingerprint_summary.py

NSt3__112basic_stringIcNS_11char_traitsIcEENS_9allocatorIcEEEE _clang_libcpp_cxxabi1002
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NSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEE _clang_libstdcpp_cxxabi1002
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Ss _gcc_libstdcpp_cxxabi1002
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class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > _msvc_debug
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