PRE-PROPOSAL: Simple operator overloading.
j16sdiz at gmail.com
Wed Mar 25 18:08:11 PDT 2009
On Wed, Mar 25, 2009 at 8:03 PM, Vilya Harvey <vilya.harvey at gmail.com> wrote:
> I would love to see this, but I'd prefer it to be based on special
> interfaces rather than annotations. This would adhere to the
> principle, mentioned on this list a few times, that annotations
> shouldn't modify the results of the compiler.
> For example, if you implement the Addable (say) interface then your
> class can be used the '+' operator; or the Subtractable interface for
We can't specify the return type if we use an interface.
We may want to do something like this:
BigInteger + BigInteger = BigInteger
BigInteger + BigDecimal = BigDecimal
BigDecimal + BigInteger = BigDecimal
BigDecimal + BigDecimal = BigDecimal
There is no way to implement this using interface.
> the '-' operator. I'd imagine you would also want some grouping
> interfaces, to reduce the number of interface declarations required
> when overloading multiple operators (e.g. interface Artihmetic extends
> Addable, Subtractable etc.).
> Whatever form it takes though, it would be great to have this
> capability in Java!
> 2009/3/25 <rssh at gradsoft.com.ua>:
>> Permanent URL: http://docs.google.com/Doc?id=dhhvggr8_18djp85shk
>> Probably too big, but anyway.
>> As I remember, alternative proposal (made  and = syntax sugar on
>> well-known interfaces, as with for-each loop) still not submitted. If
>> anybody want submit such proposal, then it is possible to reuse
>> JLS-changed for 15.26.1 from there.
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