[Interest] QVector / std::vector and memory alignment

[Philippe]

> How is it ia win for std::vector to achieve next year what QVector has done 
> for the past 7 or 8?

Not to mention we are likely far away from the time C++17 becomes a
requirement to use or build Qt.

Philippe
 
On Thu, 29 Dec 2016 10:03:03 -0200
Thiago Macieira <thiago.macieira at intel.com> wrote:

> Em quinta-feira, 29 de dezembro de 2016, às 09:32:19 BRST, Giuseppe D'Angelo 
> escreveu:
> > Il 29/12/2016 06:56, Philippe ha scritto:
> > > Sometimes there are discussions about what is best QVector vs
> > > std::vector, and here we have a good "plus" for QVector.
> > 
> > In C++17 std::vector (well, std::allocator) must honour overly-aligned
> > 
> > types:
> > > http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0035r4.html
> > 
> > GCC 7 and Clang 4 already implement it.
> > 
> > Before C++17 you could've used an aligned allocator like Boost.Align.
> > QVector doesn't allow custom allocators, so here we have a win for
> > std::vector.
> 
> How is it ia win for std::vector to achieve next year what QVector has done 
> for the past 7 or 8?
> 
> -- 
> Thiago Macieira - thiago.macieira (AT) intel.com
>   Software Architect - Intel Open Source Technology Center
> 
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