Bruce Merry b3573ac961 feat: add .keys and .values to bind_map (#3310) ... * Add `.keys` and `.values` to bind_map Both of these implement views (rather than just iterators), and `.items` is also upgraded to a view. In practical terms, this allows a view to be iterated multiple times and have its size taken, neither of which works with an iterator. The views implement `__len__`, `__iter__`, and the keys view implements `__contains__`. Testing membership also works in item and value views because Python falls back to iteration. This won't be optimal for item values since it's linear rather than O(log n) or O(1), but I didn't fancy trying to get all the corner cases to match Python behaviour (tuple of wrong types, wrong length tuple, not a tuple etc). Missing relative to Python dictionary views is `__reversed__` (only added to Python in 3.8). Implementing that could break code that binds custom map classes which don't provide `rbegin`/`rend` (at least without doing clever things with SFINAE), so I've not tried. The size increase on my system is 131072 bytes, which is rather large (5%) but also suspiciously round (2^17) and makes me suspect some quantisation effect. * bind_map: support any object in __contains__ Add extra overload of `__contains__` (for both the map itself and KeysView) which takes an arbitrary object and returns false. * Take py::object by const reference in __contains__ To keep clang-tidy happy. * Removing stray `py::` (detected via interactive testing in Google environment). Co-authored-by: Ralf W. Grosse-Kunstleve <rwgk@google.com>		2021-10-01 09:24:36 -04:00
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pybind11	feat: add .keys and .values to bind_map (#3310)	2021-10-01 09:24:36 -04:00