diff options
| author | Marc Mutz <marc.mutz@kdab.com> | 2014-02-12 14:10:35 +0100 |
|---|---|---|
| committer | The Qt Project <gerrit-noreply@qt-project.org> | 2014-02-28 21:27:41 +0100 |
| commit | 12372960f8ab3c50231c4f5c21aa6a87c69e9915 (patch) | |
| tree | d4aec4dbfb80f621e2f48c83dfa5a76e2ea7caf4 /src/corelib/doc/snippets | |
| parent | f4ffe2a2439928992c3f44085e81686d4f911417 (diff) | |
Add qHashBits(), a hash function for a memory block
The function arguments have been chosen to avoid caller-side casting of
argument types, when passing object addresses and type sizeof()s.
[ChangeLog][QtCore] Added qHashBits() to aid implementing qHash() overloads
for custom types.
Change-Id: I983a8560769bb27e489f23ebb6db51850ddd65f2
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Diffstat (limited to 'src/corelib/doc/snippets')
| -rw-r--r-- | src/corelib/doc/snippets/code/src_corelib_tools_qhash.cpp | 10 |
1 files changed, 10 insertions, 0 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 8c21083976..aa0473964c 100644 --- a/src/corelib/doc/snippets/code/src_corelib_tools_qhash.cpp +++ b/src/corelib/doc/snippets/code/src_corelib_tools_qhash.cpp @@ -297,3 +297,13 @@ while (i != hash.end() && i.key() == "plenty") { ++i; } //! [26] + +//! [qhashbits] +inline uint qHash(const std::vector<int> &key, uint seed = 0) +{ + if (key.empty()) + return seed; + else + return qHashBits(&key.front(), key.size() * sizeof(int), seed); +} +//! [qhashbits] |