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Yibo CaiAntoine Pitrou
b7f6aa1ba22
Yibo Cai authored and Antoine Pitrou committed 8f9f0f81642
ARROW-8974: [C++] Simplify TransferBitmap

This patch removes "restore_trailing_bits" template parameter of
TransferBitmap class. Trailing bits are now always not clobbered,
which is no harm. It also refines trailing bits processing to keep
the performance influence trivial. Besides, this patch replaces
"invert_bits" boolean parameter with enum to allow explicit naming.

Closes #7373 from cyb70289/bitmap-transfer

Authored-by: Yibo Cai <yibo.cai@arm.com>
Signed-off-by: Antoine Pitrou <antoine@python.org>