class QHashSeed#

New in version 6.2.



Static functions#


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Detailed Description#


d – int

Constructs a new QHashSeed object using data as the seed.

static globalSeed()#
Return type:


Returns the current global QHash seed. The value returned by this function will be zero if setDeterministicGlobalSeed() has been called or if the QT_HASH_SEED environment variable is set to zero.

static resetRandomGlobalSeed()#

Reseeds the Qt hashing seed to a new, random value. Calling this function is not necessary, but long-running applications may want to do so after a long period of time in which information about its hash may have been exposed to potential attackers.

If the environment variable QT_HASH_SEED is set to zero, calling this function will result in a no-op.

Qt never calls this function during the execution of the application, but unless the QT_HASH_SEED variable is set to 0, the hash seed returned by globalSeed() will be a random value as if this function had been called.

static setDeterministicGlobalSeed()#

Forces the Qt hash seed to a deterministic value (zero) and asks the qHash() functions to use a pre-determined hashing function. This mode is only useful for debugging and should not be used in production code.

Regular operation can be restored by calling resetRandomGlobalSeed() .