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specifically, use boost::hash_combine to combine values in hash functions, except for a couple of places where I use the small-prime-number strategy popular in the Java world, to avoid including boost in header files that are widely shared. Change-Id: I0e184c9ec8803bf09fc6e84fe20131b203e1652a Reviewed-on: https://gerrit.libreoffice.org/70384 Tested-by: Jenkins Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>