Qt has its own boost :: an additional alternative?

Question

Does Qt have its own boost :: optional, or should I just use boost :: optional?

Answer 1

There is a qt-maybe template implemented on top of the Qt QVariant container, but not in the standard qt lib.

Answer 2

Qt is of type "variant", but not the "optional" type. I think that boost::optionalis a reasonable choice.

Answer 3

, QVariant , boost::optional. :

bool QVariant::isNull() const
bool QVariant::isValid() const
Type QVariant::type() 
static QVariant QVariant::fromValue(const T & value)
T QVariant::value()

So, you can wrap any type, check if the option is null or valid, or even get the type that will be used with the if or switch statement.

Answer 4

There is no alternative for boost :: optional at present. You can also refer to this topic: boost :: an additional alternative in the C ++ standard library