[Development] Changing qreal to a float

Thiago Macieira thiago.macieira at intel.com
Wed Feb 15 13:01:12 CET 2012

On quarta-feira, 15 de fevereiro de 2012 12.11.27, Olivier Goffart wrote:
> Then I tought about Qt has its own typedef for quintptr and quint64 and what
> not, so we could as well keep qreal.
> (But i'm far from being opposed, but then we can also deprecate all the
> other ones)

Those have other reasons for being.

qint64 exists because it's "long long" on most platforms and compilers, except 
for MSVC. On that case, it's __int64. The standard type "long long" is 
available only on C++11.

quintptr has no standard type to match. qptrdiff has one: ptrdiff_t. The closest 
to quintptr is size_t. That one has a different problem though: it's not 
exactly the same type as our quint64, since GCC defines it to "unsigned long", 
not "unsigned long long", on 64-bit platforms. We have avoided using "long" in 
Qt 4, so this type would suffer from even more template issues.

Also, both size_t and ptrdiff_t require an #include.

PS:  $ gcc -fsyntax-only -xc++ - <<<'long long long x;'
<stdin>:1:1: error: ‘long long long’ is too long for GCC

Thiago Macieira - thiago.macieira (AT) intel.com
  Software Architect - Intel Open Source Technology Center
     Intel Sweden AB - Registration Number: 556189-6027
     Knarrarnäsgatan 15, 164 40 Kista, Stockholm, Sweden
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