Well, that depends on how you set up your map. You could instead make the
key a pointer to the protobuf field, and define your comparator so that it
dereferences the pointer. Of course you need to make sure that the pointer
is actually valid: if you mutate the field you may invalidate the pointer.
I try to use the pb to store a group of record with the same schema.
I wonder to know whether the key of the properties would be copied for
every record like map.
if like this, it seems to a waste of memory.
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