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http://www.reddit.com/r/programming/comments/1jtzez/component_programming_with_ranges/ 


Andrei

Andrei Alexandrescu:

> http://www.reddit.com/r/programming/comments/1jtzez/component_programming_with_ranges/

It's an interesting article, but I wrote some comments. Not even some answers before posting that to Reddit?

http://forum.dlang.org/thread/20130802052432.GA495@quickfur.ath.cx#post-ibbicmqochwtirxdbmud:40forum.dlang.org

Bye,
bearophile

On 08/06/2013 12:56 PM, Andrei Alexandrescu wrote:
> Vote up!
>
> http://www.reddit.com/r/programming/comments/1jtzez/component_programming_with_ranges/
>
>
> Andrei
>
>

This article is excellent.

Some notes:

1) More recent versions of std.datetime makes it possible to write 1.days instead of dur!"days"(1)

From:

        .recurrence!((a,n) => a[n-1] + dur!"days"(1))

To:
        .recurrence!((a,n) => a[n-1] + 1.days)

2) It is mildly annoying that sometimes it is more convenient to do non-trivial processings in .front rather than .popFront. The problem of doing so is that the user of the code may call .front multiple times assuming that the result is a reference to an already processed data when in fact each call consumes CPU cycles.

3) I haven't compiled the code but it looks like some of the signature constraints can be simplified by taking advantage of isDateRange() more.

Ali

On 6-8-2013 21:56, Andrei Alexandrescu wrote:
> Vote up!
>
> http://www.reddit.com/r/programming/comments/1jtzez/component_programming_with_ranges/
>
> Andrei
>
>

If I understand it correctly "chunkBy" cannot accept a string lambda, due to the
template constraint. Therefore the line

   alias attr = unaryFun!attrFun;

seems unnecessary to me.

By the way, when I try the code from github, it only prints the first 3 months.
DMD32 D Compiler v2.063 (win7 64)

On Tue, 6 Aug 2013 12:56:48 -0700
Andrei Alexandrescu <SeeWebsiteForEmail@erdani.org> wrote:

> Vote up!
> 
> http://www.reddit.com/r/programming/comments/1jtzez/component_programming_with_ranges/
> 

Great article. Even as an experienced D user, it really gave me a lot to think about.