[KUnitConversion] Question about overloading operators

[Ander Pijoan]

Hi Aleix,

I think at least the most desirable basic feature would be to have the
math operators overloaded to be able to operate with Values. Something like
:

Value operator +(const Value &other)
{
      Q_ASSERT( unit() == other.unit() );
      return Value(  number() + other.number() , unit()  );
}

At least to be able to operate with same Unit Values.
I have an application where I was calculating several routes. This week I
started using KUnitConversion
Values for the length, max speed and price of each of each road segment, in
order to explicitly
have the units "stored" within the value. But suddenly found I can't even
sum two lengths because the
+ operator is not overloaded.

If further operations involving different units conversions want to be
supported, probably some sort of
equivalence structures would need to be created, but I havent think much of
it. I was just asking about single
Unit operations.

Cheers.

2016-11-20 13:45 GMT+01:00 Aleix Pol <aleixpol at kde.org>:

> On Fri, Nov 18, 2016 at 1:21 PM, Ander Pijoan <ander.pijoan at deusto.es>
> wrote:
> > Hi all,
> >
> > First of all sorry if this email should be in another list.
> >
> > I have a small question about summing, subtracting, multiplying...
> Values.
> > I see that the operators have not been overloaded. Should we extend the
> > Value class and overload them or there is a more straightforward way of
> > operating with Values?
> >
> > Thanks in advance.
>
> Hi Ander,
> It's certainly tempting, I'm not sure how good it would work. Do you
> have some kind of proof of concept?
> It's something that sounds obviously good, but we need to make sure
> doesn't become a mess. Knowing what's the problems we'd find could be
> a good first approach.
> Also what's your use-case? :)
>
> Aleix
>



-- 

Ander Pijoan

Research Assistant / DeustoTech Energía

Universidad de Deusto / Deustuko Unibertsitatea

Avda. Universidades 24. 48007 Bilbao

Tel. 94 413 90 03/ 2052
ander.pijoan at deusto.es
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