[Development] QOptional

[Marc Mutz]

On Wednesday 20 August 2014 21:03:21 Иван Комиссаров wrote:
> So, we construct null QOptional from invalid QVariant and  non-null
> QOptional from valid?

In current terms, yes. I like Thiago's implicit suggestion (in the change 
comments) to use isEmpty(), though (instead of isNull()).

  QOptional<T> QVariant::toOptionalValue()
  { return isValid() ? value<T>() : QOptional<T>() ; }

  QVariant QVariant::fromOptionalValue(const QOptional<T> &opt)
  { return opt ? fromValue(opt.value()) : QVariant() ; }



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