diff options
| author | Giuseppe D'Angelo <giuseppe.dangelo@kdab.com> | 2020-02-14 16:16:56 +0100 |
|---|---|---|
| committer | Giuseppe D'Angelo <giuseppe.dangelo@kdab.com> | 2020-05-12 01:51:20 +0200 |
| commit | 707129fd5a7c6390fbdf4270119226df2a427fcd (patch) | |
| tree | 3394b456eae374078330684d0523b7874ac630de /src/corelib/doc/snippets/code | |
| parent | 2844631aa977fb1619ec3910090d1bdd4c7459c2 (diff) | |
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>
Diffstat (limited to 'src/corelib/doc/snippets/code')
| -rw-r--r-- | src/corelib/doc/snippets/code/src_corelib_tools_qhash.cpp | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/src/corelib/doc/snippets/code/src_corelib_tools_qhash.cpp b/src/corelib/doc/snippets/code/src_corelib_tools_qhash.cpp index 1f2c505a02..344fbb241d 100644 --- a/src/corelib/doc/snippets/code/src_corelib_tools_qhash.cpp +++ b/src/corelib/doc/snippets/code/src_corelib_tools_qhash.cpp @@ -151,7 +151,7 @@ inline bool operator==(const Employee &e1, const Employee &e2) inline size_t qHash(const Employee &key, size_t seed) { - return qHash(key.name(), seed) ^ key.dateOfBirth().day(); + return qHashMulti(seed, key.name(), key.dateOfBirth()); } #endif // EMPLOYEE_H |