Ed Catmur 68a0b2dfd8 Add anyset & frozenset, enable copying (cast) to std::set (#3901) ... * Add frozenset, and allow it cast to std::set For the reverse direction, std::set still casts to set. This is in concordance with the behavior for sequence containers, where e.g. tuple casts to std::vector but std::vector casts to list. Extracted from #3886. * Rename set_base to any_set to match Python C API since this will be part of pybind11 public API * PR: static_cast, anyset * Add tests for frozenset and rename anyset methods * Remove frozenset default ctor, add tests Making frozenset non-default constructible means that we need to adjust pyobject_caster to not require that its value is default constructible, by initializing value to a nil handle. This also allows writing C++ functions taking anyset, and is arguably a performance improvement, since there is no need to allocate an object that will just be replaced by load. Add some more tests, including anyset::empty, anyset::size, set::add and set::clear. * [pre-commit.ci] auto fixes from pre-commit.com hooks for more information, see https://pre-commit.ci * Add rationale to `pyobject_caster` default ctor * Remove ineffectual protected: access control Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>		2022-05-05 12:09:56 -07:00
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pybind11	Add anyset & frozenset, enable copying (cast) to std::set (#3901)	2022-05-05 12:09:56 -07:00