[Development] std::format support for Qt string types

[Thiago Macieira]

On Thursday 6 June 2024 08:07:31 GMT-7 Giuseppe D'Angelo via Development 
wrote:
> Again, I'm not really sure of entangling consoles with this.
> If you go for this approach and std::print a QString on Windows, what
> kind of output do you get?

Garbage.

Terminal-printing on Windows is fatally broken unless the Windows application 
opts in to UTF-8 support. That's the application, not a library.

The problem with terminals on Windows is that they use the even older DOS 
codepage, not the legacy Windows 8-bit CP_ACP codepage. We do not support the 
DOS codepage in Qt at all.

  qDebug() << u"\u00e4";
  printf("\xe4\n");

On a standard Windows, the first line will print the same as the second: byte 
0xE4. But instead of the LATIN SMALL LETTER A WITH DIAERESIS, you'll see a 
sigma symbol.

Therefore, please ignore terminal printing on Windows until UTF-8 is deployed 
there. Which means we can assume terminals are always UTF-8 too.

-- 
Thiago Macieira - thiago.macieira (AT) intel.com
  Principal Engineer - Intel DCAI Fleet Engineering and Quality
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