Long live qHashMulti(Commutative)

Add a helper function so that we have a shortcut.
Instead of writing:

  QHashCombine hash;
  seed = hash(seed, fieldA);
  seed = hash(seed, fieldB);
  // etc.
  return seed;

one can now simply write:

  return qHashMulti(seed, fieldA, fieldB, fieldC);

Port a few usages inside qtbase as a demonstration.

[ChangeLog][QtCore][QHash] Added the qHashMulti and
qHashMultiCommutative functions as convenience helpers
to calculate a hash from multiple variables (typically,
data members of a class).

Change-Id: I881a9ad41168df20ceecc6588a94abe7ddc6a532
Reviewed-by: Lars Knoll <lars.knoll@qt.io>
Reviewed-by: Marc Mutz <marc.mutz@kdab.com>

0 files changed, 0 insertions, 0 deletions