Add example showing how to bind virtual classes, passing to overrides by reference, registering shared_ptr, and overriding factories and data classes from Python

+ unittest: make bind_optional and test_optional.py into template files
+ cmake: instantiate boost and std optional tests using configure_file

+ default is boost::optional<T>
+ add test for boost::optional

+ create struct with fixed-size members, expose with setter

* [pre-commit.ci] pre-commit autoupdate

updates:
- [github.com/psf/black: 22.12.0 → 23.1.0](https://github.com/psf/black/compare/22.12.0...23.1.0)

* [pre-commit.ci] auto fixes from pre-commit.com hooks

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---------

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

& update its docstring

* fix includes
* comment out edge cases

unittest/eigen_ref.cpp: asConstRef should take input as Ref<const T>

eigen-allocator: try a fix for mutable Eigen::Ref from Python array with "wrong" layout

* trick transposes pyArray to get the right layout :)

std-map/std-vector: add mention to file heading

* bp::extract will construct an Eigen::Ref on the fly as an rvalue using the registered converter
* move overload_base_get_item_for_std_vector from pinocchio to here -- changes behaviour of __getitem__
* redef exposeStdVectorEigenSpecificType to overload the boost vector_indexing_suite __getitem__
* move exposeStdVectorEigenSpecificType to std-vector.hpp header

pre-commit-ci[bot] authored 2 years ago and Wilson Jallet committed 2 years ago

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* does not work properly

* tests we can expose std::vector<Matrix3d>
* test input and returning std::vector<Matrix> objects
* test specific functions for specific dims

* add test_std_vector.py
* fix copyable.hpp's include guards & namespace
* same for pickle-vector
* expose std::vector for VectorXd, MatrixXd, VectorXi, MatrixXi

* Fix flake8 errors

* flake8: ignore E203

* flake8: 119 cols for now

* black

* fix comment style

* exclude cmake.py

* clang-format: sort include

Co-authored-by: Guilhem Saurel <guilhem.saurel@laas.fr>

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* stride reversed also in this case
* add test for (1,n) and (n,1) blocks

* show correct return_value_policy to use

isolates problem with conversion