diff options
Diffstat (limited to 'src/corelib/tools/qhash.cpp')
-rw-r--r-- | src/corelib/tools/qhash.cpp | 25 |
1 files changed, 16 insertions, 9 deletions
diff --git a/src/corelib/tools/qhash.cpp b/src/corelib/tools/qhash.cpp index 4c62f6b160..97dda58748 100644 --- a/src/corelib/tools/qhash.cpp +++ b/src/corelib/tools/qhash.cpp @@ -769,17 +769,12 @@ uint qt_hash(QStringView key, uint chained) noexcept Returns the hash value for the \a key, using \a seed to seed the calculation. */ -/*! \relates QHash +/*! \fn size_t qHash(float key, size_t seed) noexcept + \relates QHash \since 5.3 Returns the hash value for the \a key, using \a seed to seed the calculation. */ -size_t qHash(float key, size_t seed) noexcept -{ - // ensure -0 gets mapped to 0 - key += 0.0f; - return murmurhash(&key, sizeof(key), seed); -} /*! \relates QHash \since 5.3 @@ -790,7 +785,13 @@ size_t qHash(double key, size_t seed) noexcept { // ensure -0 gets mapped to 0 key += 0.0; - return murmurhash(&key, sizeof(key), seed); + if constexpr (sizeof(double) == sizeof(size_t)) { + size_t k; + memcpy(&k, &key, sizeof(double)); + return QHashPrivate::hash(k, seed); + } else { + return murmurhash(&key, sizeof(key), seed); + } } #if !defined(Q_OS_DARWIN) || defined(Q_CLANG_QDOC) @@ -803,7 +804,13 @@ size_t qHash(long double key, size_t seed) noexcept { // ensure -0 gets mapped to 0 key += static_cast<long double>(0.0); - return murmurhash(&key, sizeof(key), seed); + if constexpr (sizeof(long double) == sizeof(size_t)) { + size_t k; + memcpy(&k, &key, sizeof(long double)); + return QHashPrivate::hash(k, seed); + } else { + return murmurhash(&key, sizeof(key), seed); + } } #endif |