Hi dlang community,

Just started to learn D using Visual Studio 2007, latest VisualD (VisualD-v0.51.0-dmd-2.090.0-ldc2-1.19.0) and "The D Programming Language" by Andrei Alexandrescu.

I am trying to run most of the examples and had a surprise at chapter 1.6.1 "More Statistics. Inheritance" with the following code:

interface Stat {
    void accumulate(double x);
    ...
}

class IncrementalStat : Stat {
    ...
    abstract void accumulate(double x);
    ...
}

class Min : IncrementalStat {
    ...
    void accumulate(double x) { ... }
    ...
}

In class "Min" definition I am receiving this error: "cannot implicitly override base class method `IncrementalStat.accumulate` with  `Min.accumulate`; add `override` attribute"

After I update "Min" class to << override void accumulate(double x) >> everything works fine.
Can anybody clarify where is the problem.

Thanks in advance,
Claudiu

On 2/5/20 8:49 AM, Claudiu wrote:

> In class "Min" definition I am receiving this error: "cannot implicitly override base class method `IncrementalStat.accumulate` with  `Min.accumulate`; add `override` attribute"

Andrei's book is a little dated. Here is the errata:

  http://erdani.com/index.php?cID=109

Ali

On Wednesday, 5 February 2020 at 16:55:42 UTC, Ali Çehreli wrote:
> On 2/5/20 8:49 AM, Claudiu wrote:
>
>> In class "Min" definition I am receiving this error: "cannot implicitly override base class method `IncrementalStat.accumulate` with  `Min.accumulate`; add `override` attribute"
>
> Andrei's book is a little dated. Here is the errata:
>
>   http://erdani.com/index.php?cID=109
>
> Ali

Thanks a lot, I'll need to keep this errata close for future "surprises". I'm trying to learn idiomatic D. I think that this book is still relevant, but are there other recommended books?

On Wednesday, 5 February 2020 at 17:11:28 UTC, Claudiu wrote:
>
> Thanks a lot, I'll need to keep this errata close for future "surprises". I'm trying to learn idiomatic D. I think that this book is still relevant, but are there other recommended books?

https://p0nce.github.io/d-idioms/#Which-book-should-I-read?