On Tuesday, 6 February 2024 22:02:11 PST Marc Mutz via Development wrote:
> As someone who argues that qHash("Hello"_L1) be restored to
> qHash(u"Hello"_s) after this relation was broken somewhere in Qt 5, how
> could I argue against it? :)
It was commit ea8e48a6799cf742ea23f4a30dcfc38a4988fe56
On 05.02.24 23:42, Thiago Macieira wrote:
> On Monday, 5 February 2024 01:36:39 PST Marc Mutz via Development wrote:
>> I've always understood it such that we as Qt must preserve the property
>> that the hash for equal elements is equal within _one_ run of _one_
>> process. This means you can use
On 05.02.24 19:07, apoenitz wrote:
> On Mon, Feb 05, 2024 at 09:36:39AM +, Marc Mutz via Development wrote:
>> Hi,
>>
>> I've always understood it such that we as Qt must preserve the property
>> that the hash for equal elements is equal within _one_ run of _one_
>> process.
>
> This would
On Monday, 5 February 2024 01:36:39 PST Marc Mutz via Development wrote:
> I've always understood it such that we as Qt must preserve the property
> that the hash for equal elements is equal within _one_ run of _one_
> process. This means you can use the hash in I/O in any way. That's why
> we
Hi,
I've always understood it such that we as Qt must preserve the property
that the hash for equal elements is equal within _one_ run of _one_
process. This means you can use the hash in I/O in any way. That's why
we have qt_hash, which you _can_ (and do) use in I/O (but is private
API,
On Sunday, 4 February 2024 06:12:18 PST Giuseppe D'Angelo via Development
wrote:
> Il 03/02/24 22:08, Thiago Macieira ha scritto:
> > But what about a zero seed? It's what we call a "deterministic hashing".
> > We
> > have changed the algorithms on .0 releases (in both 5.0 and 6.0 for
> >
Il 03/02/24 22:08, Thiago Macieira ha scritto:
But what about a zero seed? It's what we call a "deterministic hashing". We
have changed the algorithms on .0 releases (in both 5.0 and 6.0 for QString).
I don't think it means "deterministic" in the sense that the output will
never change across
Requirement: the qHash function in question is and has always been out-of-
line. We obviously can't change the hashing function of inline code, because
it may have been inlined.
When the seed is non-zero, we make no guarantees on what the result will be.
The result is allowed to change between
