There is no operator overloading in Java. It is implemented in other JVM
languages like Scala, but this is a bit off-topic here.
BTW, I did not say it was impossible, just that it will probably never happen
in AspectJ. ;) What you show is normal method interception, not operator
interception. Smthe example is not really relevant. Besides, you never know
what a compiler might do with arithmetic operations optimisation-wise.
Multiplication by powers of 2 might get replaced by left-shift operations (just
making up an example). I do not even say that what you suggest might not be
useful in so e rare and special cases, I just think it is way to fine-granular
for AOP purposes. I think your example is rather academic than useful in daily
work.
Alexander Kriegisch
Am 07.01.2013 um 10:34 schrieb "M. P." <free...@abv.bg>:
>>> For example I'd like to be able to select integer subtraction:
>
>
>>> Integer i = 5;
>
>>> Integer j = 2;
>
>>> Integer r = i - j;
>
>
>>> Maybe if Java supported operator overloading that would be fairly easy.
>
>
>>> 1. So is something like this possible now? I'm pretty sure it is not.
>
>
>> You are right, it is not possible.
>
>
>>> 2. Would this be possible to implement? How? Effort?
>
>>> 3. Is something like this planned for future AspectJ versions?
>
>
>> I cannot speak for the developers, but I do not think you will ever see this
>> feature in AspectJ.
>
>
>
>
>> Regards
>
>
> I'm not sure I see why not. Please consider the following example:
>
> public aspect StringConcat {
> public pointcut concat() : call(* java.lang.StringBuffer.append(..));
>
> before() : concat() {
> System.out.println("About to concatenate!");
> }
> }
>
> public class Tester {
>
> public static void main(String[] args) {
> String a = "a";
> String b = "b";
> System.out.println(a + b);
> }
> }
>
> When main() is executed the result is:
> =======================
> About to concatenate!
> ab
> =======================
>
> So we actually have a real example where the + operator is overloaded and the
> resulting code is directly in the client byte code.
> Now I'm not too familiar with the Java byte code spec but I don't see why the
> same cannot be done for e.g. Integer or event the primitive types?
>
> Thank you.
>
> MP
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