byKey and byValue: properties or methods?

Andrei Alexandrescu SeeWebsiteForEmail at erdani.org
Thu Jan 19 09:26:50 PST 2012


On 1/19/12 11:19 AM, torhu wrote:
> On 17.01.2012 07:48, Andrei Alexandrescu wrote:
>> I hate I must ask this:
>>
>> int[string] aa;
>> foreach (k; aa.byKey) { ... }
>>
>> or
>>
>> int[string] aa;
>> foreach (k; aa.byKey()) { ... }
>>
>
> For it to be a property, I think you should be able to simplify this
> example:
>
> ---
> auto k = aa.byKey;
> writeln(k.front);
> k.popFront();
> writeln(k.front);
> ---
>
> to this:
>
> ---
> writeln(k.byKey.front);
> k.byKey.popFront();
> writeln(k.byKey.front);
> ---
>
> and get the same result. But my understanding is that you wouldn't, in
> which case byKey doesn't sense to me as a property. It creates and
> returns a new range object each time you call it, right?

Yah, this is the lvalue vs. rvalue part. I think you are making a good 
argument.

Andrei


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