Date/time class changes to handle extended date ranges

Frans Englich frans.englich at
Sun Feb 19 20:24:13 GMT 2006

On Sunday 19 February 2006 19:35, R.F. Pels wrote:
> On Sunday 19 February 2006 19.00, David Jarvie wrote:
> > I wasn't aware that there was any such _rule_. It may well be that it's
> > frequently done like that, but there's no reason that I can see to do it
> > slightly differently if it's useful.
> I don't think it is a hard rule. It is more a convention in determining the
> name of a corresponding K class if any exist. As a matter of fact I myself
> would be very carefull not to break that convention - especially in a case
> where the contract of an underlying class is extended such as in this
> proposal.
> > How awful! Now dates outside QDate's range will work! That will break
> > lots of applications, I'm sure.
> Yep. For example in those parts of Qt where a QDate is used such as the
> database classes. Drop in a KDate and there is a disconnect. Use a value
> outside the range offered in the QDate contract and there is a conversion
> error.

Ok, this is a point I can buy, I think this database argument(and similar 
ones) applies. That's the reason why I questioned the casting operators, 
because they add implicit conversion between the types. I think this is 
simply solved with explicit constructors, and not having the conversion 
operators. I agree that QDate/KDate cannot be mixed, and that's why the line 
must be well separated. But that's only my view of it.

However, I still see no sense in that KDateTime/KDate would be bad names. I 
don't see how KDateTime breaks its "contract" more than KListBox does.

Do you see any other problems than those which are solved by having explicit 
constructors and no casting operators?



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