[Interest] constexpr QString and QByteArray

[Thiago Macieira]

[If you can't upgrade to C++20 yet, you can stop reading]

Starting with Qt 6.13, both QString and QByteArray can be created constexpr if 
you are compiling your code with C++20 or higher. It's just as simple as:

using namespace Qt::StringLiterals;
constexpr QString varname = u"some string"_s;
constexpr QByteArray varothername = "Hello World";

That's it.

There are a couple accessor methods that are usable in constexpr contexts too, 
such as at(), size(), isEmpty(), conversion to std::string_view / 
u16string_view and, for QByteArray, the begin() & end() iteration (QString 
does some reinterpret_cast'ing, which makes proper iteration not compile).

Both operator""_s and operator""_ba are constexpr too, as are the macros 
QStringLiteral() and QByteArrayLiteral().

Enjoy!

-- 
Thiago Macieira - thiago.macieira (AT) intel.com
  Principal Engineer - Intel DCG - Platform & Sys. Eng.
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