tree 9e7cbb3c997385c133a9e1fd136fb175807de824
parent 9a16e55ad226b5e387c1f3cf65f8d82e9b62e3c4
author Ed Catmur <ed@catmur.uk> 1651777796 +0100
committer GitHub <noreply@github.com> 1651777796 -0700
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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>