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digitalmars.D - Iterator and algorithm example

reply Sean Kelly <sean f4.ca> writes:
A long time ago I suggested a way that iterators might work but then I never
posted an example.  In light of some of the issues that have arisen today, I
thought it might be worthwhile to get some code up that folks could look at.  I
wrote this on the train on my way to work today so please forgive any
oversights, but the code does work as provided.

This example contains a basic list class (declaration is kind of odd to
workaround what seems to be a scoping issue with private member data), some
utility templates, and a very basic algorithm.  The only real annoyance is the
lack of implicit type deduction as it makes doing this stuff a lot more verbose.

http://home.f4.ca/sean/d/iterator.d


Sean
Jul 29 2004
parent reply "Matthew" <admin stlsoft.dot.dot.dot.dot.org> writes:
"Sean Kelly" <sean f4.ca> wrote in message
news:cebheo$1lsd$1 digitaldaemon.com...

 A long time ago I suggested a way that iterators might work but then I never
 posted an example.  In light of some of the issues that have arisen today, I
 thought it might be worthwhile to get some code up that folks could look at.  I
 wrote this on the train on my way to work today so please forgive any
 oversights, but the code does work as provided.

 This example contains a basic list class (declaration is kind of odd to
 workaround what seems to be a scoping issue with private member data), some
 utility templates, and a very basic algorithm.  The only real annoyance is the
 lack of implicit type deduction as it makes doing this stuff a lot more
verbose.

 http://home.f4.ca/sean/d/iterator.d


 Sean


I think your code perfectly exemplifies why, without implicit instantiation,
iterators are pretty worthless in D. I hope
that was your intent. :)

btw, there are a lot of things similar in that code to dtl/list.d. ;)

(I do have some issues with some of the things you've done, but since it's
merely an exemplifying piece, and I've not
posted any DTL yet, it'd be churlish of me to carp on. Hopefully we can
participate in a free exchange of ideas very
soon. <g>)
Jul 29 2004
parent reply Sean Kelly <sean f4.ca> writes:
In article <cec1ml$1tlt$1 digitaldaemon.com>, Matthew says...

I think your code perfectly exemplifies why, without implicit instantiation,
iterators are pretty worthless in D. I hope
that was your intent. :)


Pretty much :)  Just to show it's possible but irritating.


(I do have some issues with some of the things you've done, but since it's
merely an exemplifying piece, and I've not
posted any DTL yet, it'd be churlish of me to carp on. Hopefully we can
participate in a free exchange of ideas very
soon. <g>)


Yup.  Don't take what I wrote to heart.  I cranked 90% of that out in the hour I
had on my way to work.  It wasn't meant to be a stunning example of coding
elegance :)


Sean
Jul 29 2004
parent "Matthew" <admin stlsoft.dot.dot.dot.dot.org> writes:
"Sean Kelly" <sean f4.ca> wrote in message
news:cec34p$1uar$1 digitaldaemon.com...

 In article <cec1ml$1tlt$1 digitaldaemon.com>, Matthew says...

I think your code perfectly exemplifies why, without implicit instantiation,
iterators are pretty worthless in D. I




hope

that was your intent. :)


 Pretty much :)  Just to show it's possible but irritating.


Good. As long as I've at least one person that agrees with me, I know I'm not
completely barking.


(I do have some issues with some of the things you've done, but since it's
merely an exemplifying piece, and I've not
posted any DTL yet, it'd be churlish of me to carp on. Hopefully we can
participate in a free exchange of ideas very
soon. <g>)


 Yup.  Don't take what I wrote to heart.  I cranked 90% of that out in the hour
I
 had on my way to work.  It wasn't meant to be a stunning example of coding
 elegance :)


Cool, mate. No worries. :)
Jul 29 2004