[Development] QOptional

[Иван Комиссаров]

Иван Комиссаров

21 авг. 2014 г., в 2:10, Thiago Macieira <thiago.macieira at intel.com> написал(а):

> The optional-cast-to-boolean is a source of problems for the current 
> std::optional. That hasn't been solved.
> 
> QOptional<bool> opt1 = false;
> QOptional<int> opt2 = 0;
> if (opt1)
> 	// this is true!
> if (opt2)
> 	// this is false!

Hm, what? QOptional has no operator T and can't be converted to any value (bool or not) directly.

QOptional<bool> opt1 = false;
QOptional<int> opt2 = 0;
if (opt1)
	// this is true!
if (*opt1)
	// this is false!
if (opt2)
	// this is true!
if (*opt2)
	// this is false!

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