On segunda-feira, 19 de agosto de 2013 16:29:40, Dmitrii Volosnykh wrote:
> QFile file("test.json");
> bool ok = file.open(QFile::WriteOnly | QFile::Truncate);
> Q_ASSUME(ok);
Hmm... are you sure you know what the Q_ASSUME macro does?
You're using it where I would expect to see Q_ASSERT. For example, file
creation is something that may fail at runtime. If it does, in the case above,
your program goes into undefined behaviour after that Q_ASSUME.
You're only supposed to use it when you're *sure* it is always true.
>From the docs:
This macro could be considered a "lighter" version of \l{Q_ASSERT}. While
Q_ASSERT will abort the program's execution if the condition is false,
Q_ASSUME will tell the compiler not to generate code for those conditions.
Therefore, it is important that the assumptions always hold, otherwise
undefined behaviour may occur.
--
Thiago Macieira - thiago.macieira (AT) intel.com
Software Architect - Intel Open Source Technology Center
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