Re: User defined operators

Thaks for the tip Daniel.

Cheers, Marian


Daniel Bonniot escribi=F3:

>> I'm new to Nice I like the language (I think it is far better than=20
>> Java).
>
>
> Welcome ;-)
>
>> =BFIs it possible to define new (maybe oveloaded) operators at the use=
r=20
>> level?
>
>
> Yes, for those operators that are recognized by the parser, that is=20
> all logical and arithmetic operators.
>
>> I mean, suppose I have two objects such that I can write:
>>
>> objA.equals(objB.plus(objC));
>>
>> Is it possible to define the operators '+' and '=3D' such that the=20
>> following is valid?
>>
>> objA =3D objB + objC;
>
>
> =3D is special, it always denotes assignment, so it's not possible to=20
> overload it. I'm not sure if it would be a good idea to allow that, as=20
> it's nice to have some certitude about what =3D means in any context.=20
> But you can overload +. Suppose your objects are of class A:
>
> A `+`(A a1, A s2) ... // normal method declaration
>
> All operators are as normal methods, they just have special names,=20
> which requires that you use ``. The standard operators are actually=20
> defined like this in nice.lang (although many have a special body that=20
> generates bytecode directly).
>
>> What's more, I may want to add an operator '<<' such that I can write:
>>
>> mycol << objA;
>>
>> instead of:
>>
>> mycol.add(objA);
>
>
> Same thing, you should be able to define a method with name `<<`.
>
> Cheers,
>
> Daniel
>
>
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