Re: Boston D Language Meetup in Back Bay
On 11/17/16 12:42 PM, John Colvin wrote:
On Thursday, 17 November 2016 at 16:28:08 UTC, Steven Schveighoffer wrote:
On 11/17/16 10:38 AM, John Colvin wrote:
On Thursday, 17 November 2016 at 13:59:25 UTC, Steven Schveighoffer
wrote:
[...]
Can't you use a template lambda alias argument to pushTo instead, so
then you can instantiate it inside pushTo?
something like
nullStream!char
.bufferedInput
.pushTo!(_ => _
.arrayCastPipe!ubyte
.outputFile("output.txt")
);
maybe?
I could do that. But I don't like it ;)
I don't think it's so bad, but fair enough
I can say the part I don't like is the _ => _ thing. Ugly. Other than
that, it's actually quite nice syntax-wise.
I'm also concerned that using a lambda is going to confuse or prevent
optimization.
Why would you think that? If we can't trust the optimiser (dmd aside) to
inline a template lambda argument then phobos is totally screwed!
I admit this isn't a rational fear ;) I just have had experience with
lambdas where this does happen. The fear part of my brain is warning me,
but the memory part can't remember the specifics of when this happened...
What happens when you use a local variable in your lambda expression?
-Steve
Re: Boston D Language Meetup in Back Bay
On Thursday, 17 November 2016 at 16:28:08 UTC, Steven
Schveighoffer wrote:
On 11/17/16 10:38 AM, John Colvin wrote:
On Thursday, 17 November 2016 at 13:59:25 UTC, Steven
Schveighoffer wrote:
[...]
Can't you use a template lambda alias argument to pushTo
instead, so
then you can instantiate it inside pushTo?
something like
nullStream!char
.bufferedInput
.pushTo!(_ => _
.arrayCastPipe!ubyte
.outputFile("output.txt")
);
maybe?
I could do that. But I don't like it ;)
I don't think it's so bad, but fair enough
I will note that Adrian Matoga's flod library has a different
solution that I think is similar to this, but I don't
understand it very well.
I'm also concerned that using a lambda is going to confuse or
prevent optimization.
Why would you think that? If we can't trust the optimiser (dmd
aside) to inline a template lambda argument then phobos is
totally screwed!
I think with some better naming, the push feature will look
better.
-Steve
I look forward to it.
Re: Boston D Language Meetup in Back Bay
On 11/17/16 10:38 AM, John Colvin wrote:
On Thursday, 17 November 2016 at 13:59:25 UTC, Steven Schveighoffer wrote:
nullStream!char
.bufferedInput
.pushTo(
arrayCastPipe!ubyte
.outputFile("output.txt")
);
But then the parameters to the "pushTo" hypothetical function don't
know what the source type is before calling. By inserting valves, I
get the equivalent thing, but the types all are passed down the chain
properly.
Can't you use a template lambda alias argument to pushTo instead, so
then you can instantiate it inside pushTo?
something like
nullStream!char
.bufferedInput
.pushTo!(_ => _
.arrayCastPipe!ubyte
.outputFile("output.txt")
);
maybe?
I could do that. But I don't like it ;)
I will note that Adrian Matoga's flod library has a different solution
that I think is similar to this, but I don't understand it very well.
I'm also concerned that using a lambda is going to confuse or prevent
optimization.
I think with some better naming, the push feature will look better.
-Steve
Re: Boston D Language Meetup in Back Bay
On Thursday, 17 November 2016 at 13:59:25 UTC, Steven
Schveighoffer wrote:
nullStream!char
.bufferedInput
.pushTo(
arrayCastPipe!ubyte
.outputFile("output.txt")
);
But then the parameters to the "pushTo" hypothetical function
don't know what the source type is before calling. By inserting
valves, I get the equivalent thing, but the types all are
passed down the chain properly.
Can't you use a template lambda alias argument to pushTo instead,
so then you can instantiate it inside pushTo?
something like
nullStream!char
.bufferedInput
.pushTo!(_ => _
.arrayCastPipe!ubyte
.outputFile("output.txt")
);
maybe?
Re: Boston D Language Meetup in Back Bay
On 11/17/16 7:32 AM, qznc wrote:
On Thursday, 17 November 2016 at 02:55:46 UTC, Meta wrote:
Thanks for recording the presentation, your IOPipe library is pretty
interesting.
+1
Especially for any parser, this looks like a great solution!
Thanks! I agree, I hope to prove that with some example implementations.
The output (valves) looks meh, though. I hope, you discover something
more elegant.
Explaining valves is more complex then actually using them. The neat
thing about them is that I do not have to implement a push mechanism or
rewrite any existing transform iopipes. And in general, valves don't
have to really be involved with pushing. They are simply control points
along the pipeline (but doing output by simulating push via a pull was
the impetus for valves).
I will note that an obvious different solution (and one that I
considered) is to encapsulate the entire output pipe into one call,
something like:
nullStream!char
.bufferedInput
.pushTo(
arrayCastPipe!ubyte
.outputFile("output.txt")
);
But then the parameters to the "pushTo" hypothetical function don't know
what the source type is before calling. By inserting valves, I get the
equivalent thing, but the types all are passed down the chain properly.
I'm thinking I will rename the holdingValve and holdingLoop functions,
so that it's more clear that this results in a push mechanism. I'm still
playing with the naming.
Eventually, the valve concept I think will be more justified when I have
more building blocks available that can be used any way you wish.
-Steve
Re: Boston D Language Meetup in Back Bay
On Thursday, 17 November 2016 at 02:55:46 UTC, Meta wrote: Thanks for recording the presentation, your IOPipe library is pretty interesting. +1 Especially for any parser, this looks like a great solution! The output (valves) looks meh, though. I hope, you discover something more elegant.
Re: Boston D Language Meetup in Back Bay
On Thursday, 17 November 2016 at 01:20:58 UTC, Steven Schveighoffer wrote: I had one job... Forgot to post the link BEFORE the live stream. In any case, it was recorded and is here: https://www.youtube.com/watch?v=dVuPgbRIljA Sorry, please accept my shameful apology. -Steve I was wondering about that. Thanks for recording the presentation, your IOPipe library is pretty interesting.
Re: Boston D Language Meetup in Back Bay
On 11/16/16 6:34 PM, Steven Schveighoffer wrote: On 11/13/16 6:51 PM, Steven Schveighoffer wrote: On 11/4/16 12:02 PM, Steven Schveighoffer wrote: Just announced: https://www.meetup.com/Boston-area-D-Programming-Language-Meetup/events/235353279/ We are going to try a freely available conference room to have a presentation. No details on the presentation yet (I will figure that out soon), and probably no streaming this time. I got streaming to work. Will post a link later, in case anyone is interested. I had one job... Forgot to post the link BEFORE the live stream. In any case, it was recorded and is here: https://www.youtube.com/watch?v=dVuPgbRIljA Sorry, please accept my shameful apology. -Steve
Re: Boston D Language Meetup in Back Bay
On 11/16/16 6:34 PM, Steven Schveighoffer wrote: On 11/13/16 6:51 PM, Steven Schveighoffer wrote: On 11/4/16 12:02 PM, Steven Schveighoffer wrote: Just announced: https://www.meetup.com/Boston-area-D-Programming-Language-Meetup/events/235353279/ We are going to try a freely available conference room to have a presentation. No details on the presentation yet (I will figure that out soon), and probably no streaming this time. I got streaming to work. Will post a link later, in case anyone is interested. We should be online in some 23 minutes - the quality during the tests is great! -- Andrei
Re: Boston D Language Meetup in Back Bay
On 11/13/16 6:51 PM, Steven Schveighoffer wrote: On 11/4/16 12:02 PM, Steven Schveighoffer wrote: Just announced: https://www.meetup.com/Boston-area-D-Programming-Language-Meetup/events/235353279/ We are going to try a freely available conference room to have a presentation. No details on the presentation yet (I will figure that out soon), and probably no streaming this time. I got streaming to work. Will post a link later, in case anyone is interested. -Steve
Re: Boston D Language Meetup in Back Bay
On 11/4/16 12:02 PM, Steven Schveighoffer wrote: Just announced: https://www.meetup.com/Boston-area-D-Programming-Language-Meetup/events/235353279/ We are going to try a freely available conference room to have a presentation. No details on the presentation yet (I will figure that out soon), and probably no streaming this time. UPDATE: This Wednesday (the 16th), we will have a meetup at the Capital One Cafe conference room in the Back Bay. I'll present a short overview of my iopipe library. Hope you can join us! If everyone's up to it, we can go out after for drinks and/or food. -Steve
Re: Boston D Language Meetup in Back Bay
On 11/4/16 12:02 PM, Steven Schveighoffer wrote: Just announced: https://www.meetup.com/Boston-area-D-Programming-Language-Meetup/events/235353279/ We are going to try a freely available conference room to have a presentation. No details on the presentation yet (I will figure that out soon), and probably no streaming this time. Due to a scheduling conflict, I had to move this to Wednesday the 16th. -Steve
Boston D Language Meetup in Back Bay
Just announced: https://www.meetup.com/Boston-area-D-Programming-Language-Meetup/events/235353279/ We are going to try a freely available conference room to have a presentation. No details on the presentation yet (I will figure that out soon), and probably no streaming this time. -Steve
