Pavel Emelyanov 6ef27c9fa1 btree: Make iterators not modify the tree itself ...

The const_iterator cannot modify anything, but the plain
iterator has public methods to remove the key from the tree.
To control how the tree is modified this method must be
marked private and modification by iterator should come
from somewhere else.

This somewhere else is the existing key_grabber that's
already used to move keys between trees. Generalize this
ability to move a key out of a tree (i.e. -- erase).

Once done -- mark the iterator::erase_and_dispose private.

Signed-off-by: Pavel Emelyanov <xemul@scylladb.com>

2021-07-27 20:06:53 +03:00

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