Re: D idioms list
For optimal AA lookup, this idiom is also nice if you only need the result for one line: if (auto found = key in AA) do_stuff (found); http://idioms.in/
Re: D idioms list
For optimal AA lookup, this idiom is also nice if you only need the result for one line: if (auto found = key in AA) do_stuff (found);
Re: D idioms list
On Sat, 2015-01-10 at 14:13 -0800, Walter Bright via Digitalmars-d-announce wrote: On 1/10/2015 1:28 PM, weaselcat wrote: Sorry for the off-topic noise, but where will you be publishing your articles since Dr.Dobbs has closed? Sorry if you have answered this elsewhere. It's a good question. Dr. Dobb's has graciously given me permission to republish them, and I'll post them on http://digitalmars.com/articles. As you can see, I've already done a few of them. Lots more to go. Feel free to send stuff to ACCU's CVu or Overload. http://accu.org/index.php/journal -- Russel. = Dr Russel Winder t: +44 20 7585 2200 voip: sip:russel.win...@ekiga.net 41 Buckmaster Roadm: +44 7770 465 077 xmpp: rus...@winder.org.uk London SW11 1EN, UK w: www.russel.org.uk skype: russel_winder
Re: D idioms list
On 1/11/2015 4:24 AM, Russel Winder via Digitalmars-d-announce wrote: Feel free to send stuff to ACCU's CVu or Overload. http://accu.org/index.php/journal Good idea!
Re: D idioms list
On 1/10/2015 1:28 PM, weaselcat wrote: Sorry for the off-topic noise, but where will you be publishing your articles since Dr.Dobbs has closed? Sorry if you have answered this elsewhere. It's a good question. Dr. Dobb's has graciously given me permission to republish them, and I'll post them on http://digitalmars.com/articles. As you can see, I've already done a few of them. Lots more to go.
Re: D idioms list
On Saturday, 10 January 2015 at 20:37:04 UTC, Walter Bright wrote: On 1/8/2015 2:21 AM, ponce wrote: I've started a list of curated D tips and tricks here: http://p0nce.github.io/d-idioms/ Anything that you wished you learned earlier at one point in the D world is welcome to be added or suggested. My contribution: http://digitalmars.com/articles/b68.html (Member function pointers in D) Sorry for the off-topic noise, but where will you be publishing your articles since Dr.Dobbs has closed? Sorry if you have answered this elsewhere.
Re: D idioms list
On 1/8/2015 2:21 AM, ponce wrote: I've started a list of curated D tips and tricks here: http://p0nce.github.io/d-idioms/ Anything that you wished you learned earlier at one point in the D world is welcome to be added or suggested. My contribution: http://digitalmars.com/articles/b68.html (Member function pointers in D)
Re: D idioms list
On Friday, 9 January 2015 at 05:58:09 UTC, ketmar via Digitalmars-d-announce wrote: p.p.s. maybe it's worth adding Artur's code sample[1] too, to show that extended structure can be passed to functions which requires original one? it's not obvious, at least for me. ;-) [1] http://forum.dlang.org/post/mailman.4332.1420752329.9932.digitalmars-d-annou...@puremagic.com I didn't knew alias this does object slicing. Will add it.
Re: D idioms list
I saw recently (at last in this thread:
http://forum.dlang.org/thread/tdfydchrairigdlgt...@forum.dlang.org#post-qakiogaqvmiwlneimhgu:40forum.dlang.org)
that many users use
key in aa ? aa[key] : ValueType.init;
instead of
auto ptr = key in aa;
ptr ? *ptr : ValueType.init;
which is more economic.
Maybe you can add it to your list:
import std.stdio;
void main() {
immutable string key = foo;
immutable string[string] arr = [key : bar];
if (auto ptr = key in arr)
writeln(*ptr);
}
Re: D idioms list
On Thu, 08 Jan 2015 21:22:30 + ponce via Digitalmars-d-announce digitalmars-d-announce@puremagic.com wrote: On Thursday, 8 January 2015 at 20:23:11 UTC, ketmar via Digitalmars-d-announce wrote: i'm not sure, but maybe it worth renaming struct inheritance to extending a struct? or even something completely different. what it does is actually extending/augmenting the struct, but not OO-inheritance, as one cannot pass augmented struct to the function which expects original struct. at least without hackery. Renamed, thanks! we actually can pass extended struct as original one, as Artur shown, but i believe that extending is still better. p.s. you forgot to fix TOC, which still reads struct inheritance. signature.asc Description: PGP signature
Re: D idioms list
On Thu, 08 Jan 2015 22:25:11 +0100
Artur Skawina via Digitalmars-d-announce
digitalmars-d-announce@puremagic.com wrote:
On 01/08/15 21:23, ketmar via Digitalmars-d-announce wrote:
i'm not sure, but maybe it worth renaming struct inheritance to
extending a struct? or even something completely different. what it
does is actually extending/augmenting the struct, but not
OO-inheritance, as one cannot pass augmented struct to the function
which expects original struct. at least without hackery.
'alias this' is just the D syntax for implicit conversions.
The feature /is/ crippled, but there's no need for hackery;
at least not for simple things like that.
struct A { int a; }
struct B { A a; alias a this; string b; }
int f(A a) { return a.a+1; }
int g(ref A a) { return a.a+1; }
ref A h(ref A a) { return a; }
int main() {
B b;
return f(b)+g(b)+h(b).a;
}
artur
mea culpa. i completely forgot about that feature of `alias this`, and
was pretty sure that the code above is invalid. i never bothered to
really check it. sorry.
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Description: PGP signature
Re: D idioms list
On Thu, 08 Jan 2015 21:22:30 + ponce via Digitalmars-d-announce digitalmars-d-announce@puremagic.com wrote: On Thursday, 8 January 2015 at 20:23:11 UTC, ketmar via Digitalmars-d-announce wrote: i'm not sure, but maybe it worth renaming struct inheritance to extending a struct? or even something completely different. what it does is actually extending/augmenting the struct, but not OO-inheritance, as one cannot pass augmented struct to the function which expects original struct. at least without hackery. Renamed, thanks! p.p.s. maybe it's worth adding Artur's code sample[1] too, to show that extended structure can be passed to functions which requires original one? it's not obvious, at least for me. ;-) [1] http://forum.dlang.org/post/mailman.4332.1420752329.9932.digitalmars-d-annou...@puremagic.com signature.asc Description: PGP signature
Re: D idioms list
On Thursday, 8 January 2015 at 10:21:26 UTC, ponce wrote: I've started a list of curated D tips and tricks here: http://p0nce.github.io/d-idioms/ Anything that you wished you learned earlier at one point in the D world is welcome to be added or suggested. I think the focus should be on stuff that could make you more productive, or is just funky but that is up to debate. Of course the D Cookbook still stays irreplaceable for a consistent, in-depth discussion of being D-enabled. Thoughts? Not much to add but I enjoy reading 'idiomatic' D content - coming from C++, I feel like I'm often not writing my D code like I should be. Thanks for the extra resource.
Re: D idioms list
On Thursday, 8 January 2015 at 10:21:26 UTC, ponce wrote: I've started a list of curated D tips and tricks here: http://p0nce.github.io/d-idioms/ Anything that you wished you learned earlier at one point in the D world is welcome to be added or suggested. I think the focus should be on stuff that could make you more productive, or is just funky but that is up to debate. Of course the D Cookbook still stays irreplaceable for a consistent, in-depth discussion of being D-enabled. Thoughts? They are really cool, thanks :) Question: Where did this syntax came from? It is not documented for 'import' keyword.(first time I see that D has built-in resource compiler): ubyte[] sdlBytes = cast(ubyte[]) import(SDL2.dll);
Re: D idioms list
On Thu, 08 Jan 2015 11:24:34 + Szymon Gatner via Digitalmars-d-announce digitalmars-d-announce@puremagic.com wrote: On Thursday, 8 January 2015 at 10:21:26 UTC, ponce wrote: I've started a list of curated D tips and tricks here: http://p0nce.github.io/d-idioms/ Anything that you wished you learned earlier at one point in the D world is welcome to be added or suggested. I think the focus should be on stuff that could make you more productive, or is just funky but that is up to debate. Of course the D Cookbook still stays irreplaceable for a consistent, in-depth discussion of being D-enabled. Thoughts? They are really cool, thanks :) Question: Where did this syntax came from? It is not documented for 'import' keyword.(first time I see that D has built-in resource compiler): ubyte[] sdlBytes = cast(ubyte[]) import(SDL2.dll); it is documented: http://dlang.org/expression.html#ImportExpression it's a nice D habit of overloading keywords. signature.asc Description: PGP signature
Re: D idioms list
On Thursday, 8 January 2015 at 10:56:00 UTC, bearophile wrote: ponce: I'm not familiar with the terse, range-heavy, UFCS style that has emerged from Phobos In Rosettacode I have inserted tons of examples of that coding style. An example, given a tuple of arbitrary length, with items all of the same type, how do you compute the total of its items? The last way I've invented is: myTuple[].only.sum It's also @nogc. But it causes a little of template bloat. Bye, bearophile Cool. I will link to the Rosettacode D pages since I've used them in the past when time-constrained, especially all things regarding text files.
Re: D idioms list
On Thursday, 8 January 2015 at 11:31:14 UTC, ketmar via Digitalmars-d-announce wrote: On Thu, 08 Jan 2015 11:24:34 + Szymon Gatner via Digitalmars-d-announce digitalmars-d-announce@puremagic.com wrote: On Thursday, 8 January 2015 at 10:21:26 UTC, ponce wrote: I've started a list of curated D tips and tricks here: http://p0nce.github.io/d-idioms/ Anything that you wished you learned earlier at one point in the D world is welcome to be added or suggested. I think the focus should be on stuff that could make you more productive, or is just funky but that is up to debate. Of course the D Cookbook still stays irreplaceable for a consistent, in-depth discussion of being D-enabled. Thoughts? They are really cool, thanks :) Question: Where did this syntax came from? It is not documented for 'import' keyword.(first time I see that D has built-in resource compiler): ubyte[] sdlBytes = cast(ubyte[]) import(SDL2.dll); it is documented: http://dlang.org/expression.html#ImportExpression it's a nice D habit of overloading keywords. Ah, thanks. Follow up then: can such imported string be used for mixin?
Re: D idioms list
On Thursday, 8 January 2015 at 11:41:43 UTC, Szymon Gatner wrote: Question: Where did this syntax came from? It is not documented for 'import' keyword.(first time I see that D has built-in resource compiler): ubyte[] sdlBytes = cast(ubyte[]) import(SDL2.dll); it is documented: http://dlang.org/expression.html#ImportExpression it's a nice D habit of overloading keywords. Ah, thanks. Follow up then: can such imported string be used for mixin? Yes.
Re: D idioms list
On Thursday, 8 January 2015 at 11:43:30 UTC, ponce wrote: On Thursday, 8 January 2015 at 11:41:43 UTC, Szymon Gatner wrote: Question: Where did this syntax came from? It is not documented for 'import' keyword.(first time I see that D has built-in resource compiler): ubyte[] sdlBytes = cast(ubyte[]) import(SDL2.dll); it is documented: http://dlang.org/expression.html#ImportExpression it's a nice D habit of overloading keywords. Ah, thanks. Follow up then: can such imported string be used for mixin? Yes. That is pretty damn cool then.
Re: D idioms list
On Thu, 08 Jan 2015 11:41:42 + Szymon Gatner via Digitalmars-d-announce digitalmars-d-announce@puremagic.com wrote: On Thursday, 8 January 2015 at 11:31:14 UTC, ketmar via Digitalmars-d-announce wrote: On Thu, 08 Jan 2015 11:24:34 + Szymon Gatner via Digitalmars-d-announce digitalmars-d-announce@puremagic.com wrote: On Thursday, 8 January 2015 at 10:21:26 UTC, ponce wrote: I've started a list of curated D tips and tricks here: http://p0nce.github.io/d-idioms/ Anything that you wished you learned earlier at one point in the D world is welcome to be added or suggested. I think the focus should be on stuff that could make you more productive, or is just funky but that is up to debate. Of course the D Cookbook still stays irreplaceable for a consistent, in-depth discussion of being D-enabled. Thoughts? They are really cool, thanks :) Question: Where did this syntax came from? It is not documented for 'import' keyword.(first time I see that D has built-in resource compiler): ubyte[] sdlBytes = cast(ubyte[]) import(SDL2.dll); it is documented: http://dlang.org/expression.html#ImportExpression it's a nice D habit of overloading keywords. Ah, thanks. Follow up then: can such imported string be used for mixin? sure. either directly, or you can use CTFE to parse imported data and generate code. for now it's somewhat limited, 'cause CTFE parsing eats alot of memory, but when we'll have 128GB of RAM at bare minimum... i don't think that i'll be using external preprocessors to generate D code from various text and binary files. signature.asc Description: PGP signature
Re: D idioms list
On Thursday, 8 January 2015 at 10:30:38 UTC, uri wrote: This is great, thanks. Something I personally would find useful is a comparison between the C++ way and idiomatic D with Phobos. I finding coming from C/C++ to D very easy but I'm always wondering if I'm doing things the D way. Cheers, uri I'm not familiar with the terse, range-heavy, UFCS style that has emerged from Phobos so I'm not sure if I can write that. What could help is a list of tasks for which you asked yourself what the D way was. Is there one?
D idioms list
I've started a list of curated D tips and tricks here: http://p0nce.github.io/d-idioms/ Anything that you wished you learned earlier at one point in the D world is welcome to be added or suggested. I think the focus should be on stuff that could make you more productive, or is just funky but that is up to debate. Of course the D Cookbook still stays irreplaceable for a consistent, in-depth discussion of being D-enabled. Thoughts?
Re: D idioms list
On Thursday, 8 January 2015 at 10:21:26 UTC, ponce wrote: I've started a list of curated D tips and tricks here: http://p0nce.github.io/d-idioms/ Anything that you wished you learned earlier at one point in the D world is welcome to be added or suggested. I think the focus should be on stuff that could make you more productive, or is just funky but that is up to debate. Of course the D Cookbook still stays irreplaceable for a consistent, in-depth discussion of being D-enabled. Thoughts? This is great, thanks. Something I personally would find useful is a comparison between the C++ way and idiomatic D with Phobos. I finding coming from C/C++ to D very easy but I'm always wondering if I'm doing things the D way. Cheers, uri
Re: D idioms list
On Thursday, 8 January 2015 at 10:35:07 UTC, ponce wrote: On Thursday, 8 January 2015 at 10:30:38 UTC, uri wrote: This is great, thanks. Something I personally would find useful is a comparison between the C++ way and idiomatic D with Phobos. I finding coming from C/C++ to D very easy but I'm always wondering if I'm doing things the D way. Cheers, uri I'm not familiar with the terse, range-heavy, UFCS style that has emerged from Phobos so I'm not sure if I can write that. What could help is a list of tasks for which you asked yourself what the D way was. Is there one? No I admit I don't have any real list. It's always an in the moment sort of thing and I then just choose a D-ish/C++ style and promptly forget the exact details. I'll start to compile a list each time this comes up. And if I find any good D idioms in the process I'll include them in the list as well. Thanks, uri
Re: D idioms list
ponce: I'm not familiar with the terse, range-heavy, UFCS style that has emerged from Phobos In Rosettacode I have inserted tons of examples of that coding style. An example, given a tuple of arbitrary length, with items all of the same type, how do you compute the total of its items? The last way I've invented is: myTuple[].only.sum It's also @nogc. But it causes a little of template bloat. Bye, bearophile
Re: D idioms list
that a really nice idea, thanks. substring position, std.string.(last)indexOf(|Any|Neither) may be better btw. this should move to the dlang wiki. Any takers?
Re: D idioms list
On Thursday, 8 January 2015 at 20:00:11 UTC, Foo wrote: On Thursday, 8 January 2015 at 10:21:26 UTC, ponce wrote: I've started a list of curated D tips and tricks here: http://p0nce.github.io/d-idioms/ Anything that you wished you learned earlier at one point in the D world is welcome to be added or suggested. I think the focus should be on stuff that could make you more productive, or is just funky but that is up to debate. Of course the D Cookbook still stays irreplaceable for a consistent, in-depth discussion of being D-enabled. Thoughts? Struct inheritance with alias this You are using a class ;) And the public label is redundant.
Re: D idioms list
On 01/08/15 21:23, ketmar via Digitalmars-d-announce wrote:
i'm not sure, but maybe it worth renaming struct inheritance to
extending a struct? or even something completely different. what it
does is actually extending/augmenting the struct, but not
OO-inheritance, as one cannot pass augmented struct to the function
which expects original struct. at least without hackery.
'alias this' is just the D syntax for implicit conversions.
The feature /is/ crippled, but there's no need for hackery;
at least not for simple things like that.
struct A { int a; }
struct B { A a; alias a this; string b; }
int f(A a) { return a.a+1; }
int g(ref A a) { return a.a+1; }
ref A h(ref A a) { return a; }
int main() {
B b;
return f(b)+g(b)+h(b).a;
}
artur
