Re: DConf 2017 Day 3 Livestream
It's over. The video has already been take down. They will chop it into individual lectures and repost them on Monday or thereabouts, I think. Ahh I see, thanks.
Re: DConf 2017 Day 3 Livestream
On Saturday, 6 May 2017 at 08:03:11 UTC, Mike Parker wrote: https://www.youtube.com/watch?v=XTtruC3D2Ag Is anyone else having issues viewing the livestream?
Re: Performance of std.json
On Monday, 2 June 2014 at 00:18:19 UTC, David Soria Parra wrote: Would it make sense to start thinking about using ujson4c as an external library, or maybe come up with a better implementation. I know Orvid has something and might add some analysis as to why std.json is slow. Any ideas or pointers as to how to start with that? std.json is underpowered and in need of an overhaul. In the mean time have you tried vibe.d's json? http://vibed.org/api/vibe.data.json/
To deadalnix
watching your talk was like witnessing Fermats last theorem being proven... the scheduler solution was brilliant and the semantic analysis of a mixin statement that resulted in a comprehensible error message blew my mind. Here is a belated applause that should have happened during those slides. Well done. josh
idup class
trying to follow:
http://ddili.org/ders/d.en/class.html
//--- OSX 10.9 DMD 2.065
module test;
class Foo {
int num;
this(int num) {
this.num = num;
}
Foo dup() const {
return new Foo(this.num);
}
immutable(Foo) idup() const {
return new immutable(Foo)(this.num);
}
}
void main() {
auto foo = new Foo(1);
auto mfoo = foo.dup();
auto ifoo = foo.idup();
}
* test.d(15): Error: mutable method test.Foo.this is not callable
using a immutable object
* test.d(15): Error: no constructor for Foo
* Failed: [dmd, -v, -o-, test.d, -I.]
//---
What am i missing?
Re: idup class
On Friday, 16 May 2014 at 20:36:37 UTC, Ali Çehreli wrote:
My apologies. The code was written for an older version of dmd.
The simplest fix is to define the constructor as pure:
pure this(int num) {
this.num = num;
}
Ali
Ahh great thanks guys.
No worries Ali, great book, i refer to it all the time :)
Re: [OT] DConf - How to survive without a car?
On Wednesday, 14 May 2014 at 21:31:08 UTC, Jeremy Powers via Digitalmars-d wrote: Excellent. I need a lift if possible? Of so please tell me when I should be in the aloft lobby? This seems to still be an open question - what time to gather? I'll be there between 8am and 8:15am and will have 3 seats available (want to get there in time for breakfast)
Re: [OT] DConf - How to survive without a car?
I live in the area and will be driving by Aloft on my way to FB. I can fit 3 other people (sliver Rav4). Ill just pull up with a clever D theme sign on my car and pick up any stragglers if needed.
Re: core.sync.rwmutex example
Hi Charles,
would the following work (just a shot in the dark) ?
//---
module test;
import std.stdio;
import std.concurrency;
void spawnedFuncFoo(Tid tid, Tid tidBar) {
receive(
(int i) {
writeln(Foo Received the number , i);
send(tidBar, i, thisTid);
auto barSuccessful = receiveOnly!(string);
writeln(Bar got my (Foo) message);
}
);
send(tid, true);
}
void spawnedFuncBar(Tid tid) {
receive(
(int i, Tid tidFoo) {
writeln(Foo passed me (Bar) the number , i);
send(tidFoo, done);
}
);
receive(
(string sig) {
writeln(Main says I'm (Bar) done.);
send(tid, 42);
}
);
}
void main() {
auto tidBar = spawn(spawnedFuncBar, thisTid);
auto tidFoo = spawn(spawnedFuncFoo, thisTid, tidBar);
send(tidFoo, 42);
auto fooWasSuccessful = receiveOnly!(bool);
assert(fooWasSuccessful);
send(tidBar, your done);
auto barWasSuccessful = receiveOnly!(int);
assert(barWasSuccessful == 42);
writeln(Successfully had two separate threads communicate
with each other);
}
//---
Atom text editor
FYI: If anyone is using GitHub's text editor Atom and would like basic D syntax highlighting: apm init --package ~/.atom/packages/language-d --convert https://github.com/textmate/d.tmbundle https://atom.io/docs/v0.94.0/converting-a-text-mate-bundle
Re: OT: Your accomplishments in 2013 and plans for 2014
On Wednesday, 11 December 2013 at 19:45:25 UTC, Andrej Mitrovic wrote: As for my future plans, I'm hoping to land myself a nice programming-related job next year. I hear facebook and sociomantic are hiring ;)
Re: Lambda syntax for methods and functions
On Saturday, 7 December 2013 at 17:29:43 UTC, bearophile wrote: Even Ada2012 has a similar syntax. I think it's worth having in D. The ER: https://d.puremagic.com/issues/show_bug.cgi?id=7176 Bye, bearophile similar to dart, my 2nd favorite lang :) https://www.dartlang.org/articles/idiomatic-dart/
Re: No household is perfect
On Tuesday, 3 December 2013 at 22:28:26 UTC, H. S. Teoh wrote: [snip] Then you can write: Set a, b, c; auto d = mixin(SetExpr!a ∪ (b ∩ c)); // The above line gets turned into: // auto d = a.union(b.intersection(c)); // at compile-time. So you can write your set expressions the natural way, *and* [snip] This would make for a good blog post/wiki article. Does one already exist?
Re: Building druntime on MAC OS X
On Thursday, 21 November 2013 at 13:56:07 UTC, Jacob Carlborg wrote: BTW, if you're able to figure out how to build the Mac OS X installer on Linux Walter would appreciate it. I failed to do that. this might help: https://github.com/hogliux/bomutils
Re: dmd 2.064.2
On Tuesday, 5 November 2013 at 22:10:53 UTC, Joshua Niehus wrote: On Tuesday, 5 November 2013 at 22:08:48 UTC, Walter Bright wrote: Ok, this is it: http://ftp.digitalmars.com/dmd.2.064.2.dmg Not found :( nvm, just started working... apologies
Re: dmd 2.064.2
On Tuesday, 5 November 2013 at 22:08:48 UTC, Walter Bright wrote: Ok, this is it: http://ftp.digitalmars.com/dmd.2.064.2.dmg Not found :( http://d.puremagic.com/issues/show_bug.cgi?id=2 still open :(
Re: Anyone used LLVM-D with Dub?
On Wednesday, 2 October 2013 at 02:22:42 UTC, Alan wrote: Hello! I'm working on a project and I was going to use LLVM ... [...snip..] I want to know if anyone here has any experience witht his by any chance? The source of the problem? Is it a bug? Thanks for any suggestions. Sorry, I haven't tried it, but you're more likely to get positive responses on the vibe.d forum: http://forum.rejectedsoftware.com/
fedora libcurl-gnutls issue
http://d.puremagic.com/issues/show_bug.cgi?id=10710 Does anyone know if there is there a workaround for this issue? Unfortunately Im stuck with fedora and cant jump to another OS... Thanks
Re: fedora libcurl-gnutls issue
On Friday, 27 September 2013 at 16:52:49 UTC, Dicebot wrote: Simply building dmd/phobos from git tag should result in proper linkage. Nothing is ever simple with me :) Thanks Dejan and Dicebot
Re: Improved Phobos dox
On Sunday, 15 September 2013 at 18:38:54 UTC, Sönke Ludwig wrote: Just as a reminder, this is the current version: http://vibed.org/temp/d-programming-language.org/phobos/std/array.html This is way better +1
Re: dub: should we make it the de jure package manager for D?
On Tuesday, 10 September 2013 at 20:48:58 UTC, Andrei Alexandrescu wrote: We're considering making dub the official package manager for D. What do you all think? This would be awesome. +1
Re: The definitive guide to Trolls (was Move VisualD to github).
-- sycophant (wishes he was an Ent)
Re: Programming in D book is about 88% translated
On Saturday, 29 June 2013 at 02:02:26 UTC, Ali Çehreli wrote: I have continued with the translation of the book [snip] excellent. Keep up the good work Ali!
Re: DMD 2.063.2 now up
On Tuesday, 18 June 2013 at 13:52:25 UTC, Gary Willoughby wrote: Thanks, but Mac OS has a broken download link. time to open a More Mac Love? thread...
Re: Path as an object in std.path
On Wednesday, 5 June 2013 at 06:27:46 UTC, Dylan Knutson wrote: which exposes a much more palatable interface to path string manipulation. [...snip...] I'd like some feedback on what others think about this; personally, I prefer the current implementation and found it easy to use for the multitudes of tiny scripts I've written. I wouldn't like to create an object just to call isAbsolute. That being said, I don't see why having the struct would hurt. Nice work by the way
Re: The stately := operator feature proposal
On Thursday, 30 May 2013 at 13:13:02 UTC, MrzlganeE wrote: I hate you all, and with this, I exit the D community ooo, a sensitive troll... There was a time when D didn't have the sugary lambda syntax: = I think that turned out nicely. (maybe someone already mentioned this in the thread, didn't see it) I'm also in favor of :=
Re: D's limited template specialization abilities compared to C++
On Saturday, 25 May 2013 at 16:27:59 UTC, deadalnix wrote: Hi, I obviously don't know D that much, but I assume I do. [..snip..] chuckle +1
Re: Vote for std.uni
On Monday, 20 May 2013 at 06:18:15 UTC, Jesse Phillips wrote: Sunday April 26 PST will be the last day of voting. 2014? vote: yes
Re: Low-Lock Singletons In D
On Monday, 6 May 2013 at 02:35:33 UTC, dsimcha wrote: Article: http://davesdprogramming.wordpress.com/2013/05/06/low-lock-singletons/ Reddit: http://www.reddit.com/r/programming/comments/1droaa/lowlock_singletons_in_d_the_singleton_pattern/ Excellent talk at the conf, solid blog: +1 and 1
Re: Reducing the inter-dependencies (in Phobos and at large)
On Wednesday, 24 April 2013 at 12:03:52 UTC, Dmitry Olshansky wrote: E.g. std.regex would import std.concept.random to get isUniformRNG and rely on duck typing thusly described to use it correctly. Thoughts? Other ideas? how would this be different then limited imports such as: import std.random: isUniformRNG; ?
Re: Vote for std.process
yes
Re: OSX users out there? Serious bug (I think)
On Sunday, 31 March 2013 at 20:02:40 UTC, monarch_dodra wrote: This is a two part post. First, I wanted to pol how many users out there were developing under OSX? The threads seem to indicated users under windows or Linux, but I've never heard of anybody under OSX. So who has or is developing under OSX? Anybody? [snip] I use osx as well. most of the things i do are small toy programs. Though i do play around with vibe a bit and never had any major issue.
Re: T-shirt design
ill be wearing the losers TShirt: https://www.dropbox.com/s/vr5cmklgjpiomgk/dconfTShirt.png
Re: T-shirt design
On Tuesday, 19 March 2013 at 05:02:36 UTC, deadalnix wrote: I like it as well. Did you printed it already ? not yet, i was mocking up the design (after some feedback*) on a custom t-shirt website. I'll probably order it next week or so; wear it around for humor's sake. * can't believe people were so put-off by brown, its very fashionable!
Re: T-shirt design
On Wednesday, 6 March 2013 at 20:58:35 UTC, Andrei Alexandrescu wrote: Hi everyone, Time to design the DConf 2013 T-shirts! Please reply to this with any ideas you may have. I have some ideas, but I'm sure they're not the best one. Destroy! Thanks, Andrei Here is my design: https://docs.google.com/file/d/0B6Ql34B0g27ZZ3JRMFVEQ3VIbGc/edit
Re: DIP27 available for destruction
On Tuesday, 26 February 2013 at 18:27:13 UTC, Andrej Mitrovic wrote: Where's the link? I don't see it listed: http://wiki.dlang.org/DIPs just added: http://wiki.dlang.org/DIP27 Transitional measure to mitigate breakage // Transitional behavior. static assert(is(typeof(foo) == void function()); // Error (foo has no address). Final behavior static assert(is(typeof(foo) == void function()); are these supposed to be different?
Re: What happened to the alias this = identifier syntax in 2.062?
On Friday, 22 February 2013 at 21:23:04 UTC, Timon Gehr wrote: [snip].. or the alias this syntax should be deprecated in favour of a specially named member function. pseudonym foo;
Re: What happened to the alias this = identifier syntax in 2.062?
On Friday, 22 February 2013 at 23:20:55 UTC, Timon Gehr wrote:
auto opPseudonym() { ... }
alias opPseudonym=foo;
Isn't that creating multiple functions for the same thing?
shamelessly copies Ali's example
struct Fraction
{
long numerator;
long denominator;
double value() const @property
{
return cast(double)numerator / denominator;
}
alias this = value;
}
as opposed to:
struct Fraction
{
long numerator;
long denominator;
double value() const @property
{
return cast(double)numerator / denominator;
}
@pseudonym value;
// in the year 2000...
@pseudonym value, value2, value3;
}
Re: What happened to the alias this = identifier syntax in 2.062?
didn't fully formulate that thought:
above examples vs. the following
struct Fraction
{
long numerator;
long denominator;
double value() const @property
{
return cast(double)numerator / denominator;
}
auto opPseudonym() { /* points to value() ? */ }
alias opPsuedonym=value; // ??
}
Re: D 2.062 release
On Monday, 18 February 2013 at 07:31:53 UTC, Walter Bright wrote: As long as it isn't written in Ruby :-) But more seriously, a D tool to do it might be interesting. Here is a simpleton hack: ### RUBY require nokogiri require open-uri # provided the urls are given changes_new_features_url = http://...blah blah... d_runtime_fixes_url = http://...blah blah... phobos_fixes_url = http://...blah blah... def get_summaries(url) summaries = [] page = Nokogiri::HTML(open(url)) table = page.css(.bz_buglist) rows = table.css(tr) rows.each do |row| summary = row.css(td:last-child).text.strip summaries summary if !summary.empty? end summaries end puts \nChanges and New Features: puts get_summaries(changes_new_features_url) puts \nD Runtime Fixes: puts get_summaries(d_runtime_fixes_url) puts \nPhobos Fixes: puts get_summaries(phobos_fixes_url) ### END I guess the correct approach is to use Bugzilla's REST api, but its 1am... and this might be good enough?
A Mathematician looks at D
http://www.reddit.com/r/programming/comments/18r7zk/a_mathematician_looks_at_d/ No REPL, I guess we are rubbish?
Re: A Mathematician looks at D
Personally I find REPLs super annoying, especially when you need
to import or require something or like to use multiple lines.
Serious how hard is it to just do:
### Ruby
#!/usr/bin/ruby
require pp
puts do stuff
// D
#!/usr/bin/rdmd
import std.stdio;
void main() {
writeln(do stuff);
}
then press Command+b (Sublime text) and watch it work/fail?
Re: D for scientific computing
On Wednesday, 23 January 2013 at 22:39:04 UTC, Alan wrote: to know if D can compete with C or Fortran for numerical work. https://github.com/kyllingstad/scid You dont need to compete, you can take established good and fast FORTRAN/C code and use it within your own D program.
Re: D for scientific computing
On Thursday, 24 January 2013 at 00:29:15 UTC, Joshua Niehus wrote: You dont need to compete, you can take established good and fast FORTRAN/C code and use it within your own D program. I forgot to add: If you doing new stuff then D can be as fast as anything eles, provided the algorithm is sound, optimizers turned on, sprinkle in a lil asembly, etc...
shared std.signals
Is it possible to create a shared signal class?
I would like to create a shared signal class so some other
process that knows certain things can come along emit its info to
any observer:
import std.stdio, std.signals;
class Observer {
void watch(string msg) {
writeln(msg);
}
}
class Foo {
string value() {
return _value;
}
string value(string v) {
if (v != _value) {
_value = v;
emit(_value);
}
return v;
}
mixin Signal!(string);
private:
string _value;
}
shared Foo a;
void main() {
a = new shared Foo();
Observer o1 = new Observer();
a.connect(o1.watch);
}
Re: shared std.signals
On Wednesday, 23 January 2013 at 07:11:59 UTC, Joshua Niehus wrote: Is it possible to create a shared signal class? oh god... dont tell me __gshared ! Think i answered my own question, it got me to the next step. going to have to read through those giant shared threads again
Re: D rawkz! -- custom writefln formats
On Wednesday, 16 January 2013 at 19:49:55 UTC, Philippe Sigaud wrote: What about creating a new page on the Wiki (D Rawks) and putting small articles in them? That way, we can all do it without having a website and newcomers can be shown its content. http://wiki.dlang.org/D_Rocks
Re: Mac OS installer
On Tuesday, 8 January 2013 at 04:00:25 UTC, Elias Zamaria wrote: Can anyone help me with this? Do you have Xcode installed? If so, do you have Command Line Tools installed? Otherwise, you'll need to install Xcode (free from app store), then: Open Xcode - Preferences - Downloads - Components - Command Line Tools related thread: http://forum.dlang.org/thread/nxawipcegdmbkqkal...@forum.dlang.org
Re: Help me write saveAll
On Friday, 21 December 2012 at 17:01:14 UTC, monarch_dodra wrote:
There are a lot of algorithms in std.algorithm that operate on
foo(Range, Needles...)(Range range, Needles needles).
Needles can be anything, in particular, either an element or
a range.
The thing is that every now and then, you want to save the
entirety of (the ranges) inside needles. EG, I want to be able
to write:
foo(range, needles.saveAll);
[...snip...]
Any thought on how do get this working?
size_t r = startsWith!pred(haystack, needles.saveAll);
Sorry if im misunderstanding, but doesn't filter do this?
Example:
import std.stdio, std.algorithm, std.range;
void main() {
auto x = [
[1, 2, 3],
[4, 5, 6],
[7, 8, 9],
[10, 11, 12]
];
//haystack // needle //
needle
auto y = x.filter!(a = (a == [4, 5, 6] || a == [7, 8,
9])).array;
y.writeln;
}
Re: [OT] Three Optimization Tips for C++
On Thursday, 20 December 2012 at 05:29:46 UTC, Andrei Alexandrescu wrote: Vote up! http://www.reddit.com/r/programming/comments/155ivw/three_optimization_tips_for_c_video/ Andrei Almost 2 years ago, I stumbled across your book at a BarnesNobel and began my journey with D. It turns out its an unsigned copy. Any chance you'll sign it at the DConf?
Re: Invalid trainling code unit
On Saturday, 15 December 2012 at 06:07:10 UTC, rumbu wrote: I'm trying to understand how strings are working in D. I got the following error when declaring a simple string variable: Invalid trailing code unit: wstring needle = `Être sans la verité`; Considering that the line obove is copied exactl from the site examples, what I'm doing wrong? works for me and on the DPaste site: http://dpaste.dzfl.pl/00b66ba8 what platform are you on and what version of D are you using? are you passing any compiler flags or just running plain ol' $rdmd test.d ?
Dr. Dobbs
in case anyone missed it: http://www.drdobbs.com/cpp/porting-the-d-compiler-to-win64/240144208
Re: Experimental Phobos modules?
On Wednesday, 5 December 2012 at 21:05:30 UTC, Jonathan M Davis wrote: But I think that that's completely inappropriate for putting into Phobos. I'd love to try out the new stuff if its convient enough... I dont want to go jumping around github, pick up the staging material, put it into my current dev system and then play. It would be *much* nicer if its part of Phobos
Re: Deprecated Library Functions / Methods
On Sunday, 2 December 2012 at 23:56:29 UTC, Jonathan M Davis wrote: [... breath snip /breath ...] I don't like leaving clutter in code, and in this case, I think that it's safe and reasonable to clean up that clutter. - Jonathan M Davis +1
Re: prune with dirEntries
On Friday, 30 November 2012 at 12:02:51 UTC, Dan wrote: Good idea, thanks. I could not get original to compile as is - but the concept is just what was needed. I got an error on line 8: Error: not a property dirEntries(path, cast(SpanMode)0, true).filter!(__lambda2) I'm using a quite recent version of dmd and phobos. hmm strange... I'm using 2.060 (on a mac), But, I pulled the lamda out into a function and it works great. I assume the parallel is for performance, and it actually runs significantly slower than without on my test case - but no work is being done other than build the list of files, so that is probably normal. For my case the breakdown is: No Pruning: 11 sec Pruning Parallel: 4.78 sec Pruning Serial: 0.377 sec Thats cool. Yea I thought parallel would make a big difference (in the positive sense) for large directories, but I guess if we are recursively spawning parallel tasks, the overhead involved starts accumulating, resulting in worse performance (my best guess anyway).
Re: prune with dirEntries
On Friday, 30 November 2012 at 01:57:21 UTC, Dan wrote:
That will do the filtering correctly - but what I was hoping
was to actually prune at the directory level and not drill down
to the files in of an unwanted directory (e.g. .git). The
problem with this and what I'm trying to overcome is accessing
lots of files and directories recursively all of which I want
to skip. Much like there is a *followSymlink* it would be nice
if a predicate were accepted to *followDirectory* in general or
some way to cause that.
what about the following?
import std.algorithm, std.array, std.regex;
import std.stdio, std.file;
void main()
{
auto exclude = regex(r\.git, g);
dirEntries(/path/GIT, SpanMode.breadth)
.filter!(a = match(a.name, exclude).empty)
.writeln();
}
I think if you go breadth first, you can filter out the unwanted
directories before it delves into them
Re: prune with dirEntries
On Friday, 30 November 2012 at 06:29:01 UTC, Joshua Niehus wrote:
I think if you go breadth first, you can filter out the
unwanted directories before it delves into them
oh wait... it probably still looks through all those dir's.
What about this?
import std.algorithm, std.regex, std.stdio, std.file;
import std.parallelism;
DirEntry[] prune(string path, ref DirEntry[] files)
{
auto exclude = regex(r\.git|\.DS_Store, g);
foreach(_path; taskPool.parallel(dirEntries(path,
SpanMode.shallow)
.filter!(a = match(a.name, exclude).empty)))
{
files ~= _path;
if (isDir(_path.name)) { prune(_path.name, files); }
}
return files;
}
void main()
{
DirEntry[] files;
prune(/path, files);
foreach(file;files) { writeln(file.name); }
}
Re: path matching problem
On Tuesday, 27 November 2012 at 19:40:56 UTC, Charles Hixson
wrote:
Is there a better way to do this? (I want to find files that
match any of some extensions and don't match any of several
other strings, or are not in some directories.):
import std.file;
...
string exts = *.{txt,utf8,utf-8,TXT,UTF8,UTF-8};
string[] exclude = [/template/, biblio.txt,
categories.txt,
subjects.txt, /toCDROM/]
int limit = 1
// Iterate a directory in depth
foreach (string name; dirEntries(sDir, exts,
SpanMode.depth))
{ bool excl = false;
foreach (string part; exclude)
{ if (part in name)
{ excl = true;
break;
}
}
if (excl) break;
etc.
maybe this:?
import std.algorithm, std.array, std.regex;
import std.stdio, std.file;
void main()
{
enum string[] exts = [`.txt`, `.utf8`, `.utf-8`,
`.TXT`, `.UTF8`, `.UTF-8`];
enum string exclude =
`r/template/|biblio\.txt|categories\.txt|subjects\.txt|/toCDROM/`;
auto x = dirEntries(/path, SpanMode.depth)
.filter!(`endsWith(a.name,` ~ exts.join(,) ~ `)`)
.filter!(`std.regex.match(a.name,` ~ exclude ~
`).empty`);;
writeln(x);
}
Re: path matching problem
On Tuesday, 27 November 2012 at 23:43:43 UTC, Charles Hixson
wrote:
But why the chained filters, rather than using the option
provided by dirEntries for one of them? Is it faster? Just
the way you usually do things? (Which I accept as a legitimate
answer. I can see that that approach would be more flexible.)
Ignorance...
Your right, I didn't realize that dirEntries had that filter
option, you should use that. I doubt the double .filter would
effect performance at all (might even slow it down for all i know
:)
//update:
import std.algorithm, std.array, std.regex;
import std.stdio, std.file;
void main()
{
string exts = *.{txt,utf8,utf-8,TXT,UTF8,UTF-8};
enum string exclude =
`r/template/|biblio\.txt|categories\.txt|subjects\.txt|/toCDROM/`;
dirEntries(/path, exts, SpanMode.depth)
.filter!(` std.regex.match(a.name,` ~ exclude ~ `).empty `)
.writeln();
}
Re: Converting a number to complex
On Saturday, 24 November 2012 at 07:27:18 UTC, Philippe Sigaud wrote: It's an is() expression (you cited my tutorial, there is an appendix on it). It recently became even more powerful, so the tutorial is not accurate any more. its time for another read through:) Template constraints might make for a good talk at the conf...
Re: Converting a number to complex
On Friday, 23 November 2012 at 12:39:59 UTC, Frederik Vagner
wrote:
Now do it for complex number please ^^
touche!
import std.stdio, std.conv, std.traits, std.complex;
template isComplexNumeric(T)
{
static if(is(NumericTypeOf!T)) {
enum bool isComplexNumeric = is(NumericTypeOf!T);
}
else static if (is(T == Complex!double))
{
enum bool isComplexNumeric = is(Complex!double);
}
// fillin real and float here... (e.g. is(Complex!real);
etc...
}
class Example(T) if (isComplexNumeric!T)
{
T k = to!T(1);
}
void main()
{
auto x = new Example!(Complex!double)();
writeln(x.k);
auto y = new Example!double();
writeln(y.k);
auto z = new Example!string(); // fail
writeln(z.k);
}
A bit messy, but im sure there is some room for cleanup
somewhere...
Re: Converting a number to complex
On Friday, 23 November 2012 at 16:11:25 UTC, Joshua Niehus wrote:
A bit messy, but im sure there is some room for cleanup
somewhere...
Errata... (what i get for copy/pasting)
import std.stdio, std.conv, std.traits, std.complex;
template isComplexNumeric(T)
{
static if(isNumeric!T) {
enum bool isComplexNumeric = true;
}
else static if (is(T == Complex!double))
{
enum bool isComplexNumeric = true;
}
else {
enum bool isComplexNumeric = false;
}
}
class Example(T) if (isComplexNumeric!T)
{
T k = to!T(1);
}
void main()
{
auto x = new Example!(Complex!double)();
writeln(x.k);
auto y = new Example!double();
writeln(y.k);
auto z = new Example!string();
writeln(z.k);
}
i did have to reference Philippe Sigaud's excellent book on
Templates several times:
https://github.com/PhilippeSigaud/D-templates-tutorial/blob/master/dtemplates.pdf
Re: Converting a number to complex
meh, couldn't resist:
import std.stdio, std.conv, std.traits, std.complex;
template isComplex(T)
{
static if (is(T == Complex!double))
{
enum bool isComplex = true;
}
else static if (is(T == Complex!float))
{
enum bool isComplex = true;
}
else static if (is(T == Complex!real))
{
enum bool isComplex = true;
}
else {
enum bool isComplex = false;
}
}
template isComplexOrNumeric(T)
{
enum bool isComplexOrNumeric = (isComplex!T || isNumeric!T);
}
class Example(T) if (isComplexOrNumeric!T)
{
T k = to!T(1);
}
Re: Converting a number to complex
On Friday, 23 November 2012 at 18:45:53 UTC, Artur Skawina wrote:
template isComplex(T) {
static if (is(T _ == Complex!CT, CT))
enum isComplex = true;
else
enum isComplex = false;
}
artur
oh wow didnt know u could do that. much nicer.
Re: Converting a number to complex
On Thursday, 22 November 2012 at 15:47:11 UTC, Frederik Vagner
wrote:
I am trying to make a templated class to accept any numeric
type:
class example(Type) if (isNumeric(Type))
{
Type k = to!Type(1);
}
however I always get a compiler erro stating I cannot make that
conversion. How do I fix it?
// phobos
import std.stdio, std.conv, std.traits;
class Example(T) if (isNumeric!T)
{
T k = to!T(1);
}
void main()
{
auto x = new Example!double();
writeln(x.k);
}
Re: Talk proposal (kinda): D Programming in D (Or: Writing idiomatic D code)
On Wednesday, 21 November 2012 at 18:42:55 UTC, Leandro Motta Barros wrote: Well, this is actually a talk proposal for someone else. I'd be the audience, not the speaker. TITLE: D Programming in D (Or: Writing idiomatic D code) +1 I'd like to add, maybe put some focus on Range oriented coding seeing as Phobos is full or ranges etc...
Re: DConf 2013 on kickstarter.com: we made it!
On Tuesday, 20 November 2012 at 20:23:56 UTC, Iain Buclaw wrote: I got tired of the suspense, so I pledged the remainder $550 to push you over the finish line. http://www.kickstarter.com/projects/2083649206/the-d-programming-language-conference-2013-0 Lets hold a big congrats to Andrei and Walter. Look forward to seeing you all in April/May. Awesome :)
Re: OSX Installer
On Thursday, 1 November 2012 at 07:30:58 UTC, Jacob Carlborg wrote: It's not just the installer that depends on having Xcode installed, D depends on it. DMD uses GCC as the linker. I see, thanks Jacob. I'll stick with the Xcode-cmd line tools instructions then and sprinkle in a little more detail about why.
OSX Installer
I'm trying to write up a tutorial for D+vibed and have stumbled on a pretty basic issue. The DMD installer for OSX fails out of the box on Lion and Mountain Lion because Apple got rid of their developer command line tools stuff: http://robots.thoughtbot.com/post/27985816073/the-hitchhikers-guide-to-riding-a-mountain-lion So basically the install process for new mac users is: 1. Get Xcode 2. Install Command Line tools via Xcode preferences 3. Run DMD mac installer Obvious first question: D needs Xcode to run? sigh Is this going to be fixed in the next release or should I just point to the .zip package instead? Thanks, Josh
std.concurrency msg passing
Is the following snippet a bug?
---
import core.thread;
import std.stdio, std.concurrency;
void foo(Tid tid) {
send(tid, true);
}
void main() {
auto fooTid = spawn(foo, thisTid);
auto receiveInt = receiveTimeout(dur!seconds(10), (int
isInt) {
writeln(I should not be here);
});
}
// output: I should not be here
---
If not, is there some way I could achieve
receiveOnlyTimeout!(int)(dur, fun); ?
Thanks,
Josh
Re: std.concurrency msg passing
On Thursday, 18 October 2012 at 17:33:04 UTC, cal wrote:
I can't see the bug? The receiver accepts a bool as an int,
same way a normal function does. The timeout is long enough
that foo gets a chance to send. If you want to stop the int
receiver getting a bool, you could add another receiver with
(bool) { // do nothing } or whatever before the (int) one,
which will be a better match for the send.
I got myself into a situation where I dont know which will be
called first, the int or the bool and when the call happens
matters.
It was my assumption that receiveTimeout(dur, (type){}); would
distinguish between a bool and an int like it does for float and
int. But I can see why it would treat true/false as 0/1, so not
a bug.
Anyway my current workaround is to define a few Signal structs
and use those instead:
struct SignalReady { blah }
struct SignalXDone { blah }
struct SignalYDone { blah }
Thanks for the reply.
Re: clear() and UFCS
I take it back, dispose is no good. That should be the name of the deterministic destructor in the object. Now I don't have a good name. Finalize isn't right, and neither is dispose... -Steve disembowel?
Re: Mono-D 0.3.5
On Monday, 26 March 2012 at 23:57:27 UTC, alex wrote: Couple of bug fixes + new refactoring feature: [snip] Got it up and running on my Mac. Awesome job, thanks josh
Re: Three Unlikely Successful Features of D
On Tuesday, 20 March 2012 at 19:02:16 UTC, Andrei Alexandrescu wrote: What are your faves? I have a few in mind, but wouldn't want to influence answers. Thanks, Andrei 1) inferred types (auto) 2) slices 3) whole sum(mixin, opDispatch, static if)
Re: regex issue
On Friday, 16 March 2012 at 08:34:18 UTC, Dmitry Olshansky wrote: Ehm, because they have different engines that _should_ give identical results. And the default one apparently has a bug, that I'm looking into. Fill the bug report plz. Ok, submitted: id 7718 Thanks, Josh
Re: Compiling DMD on MAC OS X
On Monday, 20 February 2012 at 11:18:34 UTC, Tyro[a.c.edwards] wrote: ... and I doubt you want me to put all of what dmd -v spits out for this little script. Thanks, Andrew Hi Andrew, I ran into this problem as well and here is how I fixed/hacked it: OSX Lion, and soon to be Mountain Lion, no longer come with GCC installed for the Command Line (/usr/bin/gcc) What you need to do is Install Xcode from the app store, which is free, and then: * Launch your Xcode 4.1 * Go to preferences Downloads * Click on the install button near the Command line tools This will put gcc in your /usr/bin directory. Then try to recompile your code. -- the new mac installer on the website should probably come with gcc or check for dependencies Josh
Reflection
Hello,
I dont understand the following snippet's output:
import std.stdio, std.traits;
void main() {
writeln(isSomeFunction!(writeln));
writeln(isCallable!(writeln));
writeln(Yes I am...);
}
/* OUTPUT */
false
false
Yes I am...
If 'writeln' isn't a method/function and it's not callable, then
what is it?
Thanks,
Josh
Re: Reflection
On Tuesday, 28 February 2012 at 06:10:11 UTC, Jesse Phillips wrote: It is a template. I see, thanks. And I bet its not possible to figure out if a template is a function template or a class template etc...
Syntax highlighting for CodeRunner
In the off chance that some of you are running a Mac and using CodeRunner to play around with D, I cooked up the files you need for CodeRunner to highlight D's syntax: https://github.com/jniehus/Dlang-for-CodeRunner
Re: [your code here]
On Saturday, 18 February 2012 at 08:18:32 UTC, Denis Shelomovskij
wrote:
Some remarks:
0. `string[] args` isn't needed;
1. `delegate` is not needed;
2. `isSomeString!(T)` can be replaced by `isSomeString!T`;
3. `static if` can be replaced by `auto m =
mixin(isSomeString!T ? n ~ i : n + i);`;
4. With nnew `=` syntax function body can be replaced by
`return (T i) = mixin(isSomeString!T ? n ~ i : n + i);`
or
`return (T i) = mixin(n ~ (isSomeString!T ? '~' : '+') ~
'i');`
So your code can looks like this:
---
import std.stdio, std.traits;
void main() {
auto foo(T)(T n) {
return (T i) = mixin(n ~ (isSomeString!T ? '~' :
'+') ~ 'i');
}
writeln(foo(Hello)( World!));
writeln(foo(18)(24));
}
IMHO, all these three versions should be on the site grouped
somehow (i.e. one can navigate between analogous).
Ahhh, thats much cleaner, thanks.
[your code here]
Not as fancy as the other submits, but it might be worthy of the
front page:
import std.stdio, std.traits;
void main(string[] args) {
auto foo(T)(T n) {
return delegate(T i) {
static if (isSomeString!(T))
auto m = mixin(n ~ i);
else
auto m = mixin(n + i);
return m;
};
}
writeln(foo(Hello)( World!));
writeln(foo(18)(24)); }
Re: [your code here]
import std.stdio, std.stream, std.string, std.range,
std.algorithm;
void main() {
int countPalindromes;
auto infile = new BufferedFile(ukacd17.txt);
foreach (char[] line; infile) {
if (line.walkLength(2) 1) {
line.toLowerInPlace;
if (equal(line, retro(line)))
countPalindromes++;
}
}
writeln(palindromes found: , countPalindromes);
}
I ran this code on Mac OSX Lion using the /usr/share/dict/words
file and got 235834 words out of 235886. I think something is
wrong.
Re: [your code here]
I ran this code on Mac OSX Lion using the /usr/share/dict/words file and got 235834 words out of 235886. I think something is wrong. found the problem: PEBKAC (problem exists between keyboard and chair) sorry:)
Re: D for the web?
On Monday, 23 January 2012 at 16:43:06 UTC, F i L wrote: There are better languages for large client-side web apps like Coffeescript... CoffeeScript is a little language that compiles into JavaScript
Waiting around
Hello,
I need to connect to a network location and read a file but I also need
some way of waiting around until the connection is established. Currently
I use the following snippet to do this:
while (!std.file.exists(/Volumes/mountedDir/myfile.txt) timeout 30)
{
core.thread.Thread.sleep(10_000_000); // core.thread.Thread
conflicts with std.regex.Thread, hence the full path reference
timeout++;
}
with the recent changes to std.regex it stopped compiling due to the
Thread conflict. Is there a more obvious way to do what I'm doing that
avoids importing core.thread?
Thanks,
Josh
Java Scala - new thread: GUI for D
On 12/1/11 2:59 AM, Walter Bright wrote: On 12/1/2011 2:42 AM, Gour wrote: I'd like to help with GUI bindings if D community would come more close together here with some people ready to lead the herd... Why not you lead the effort? I just went to the Qt DevDays 2011 and it looks like a lot of work is being done to get QML ready for desktop applications. Its Qt's next gen UI framework and its JavaScript based (it looks pretty good). It might be worth while to investigate using QML as a UI frontend and use D code to do the backend heavy lifting as opposed to C++. I know there was a Qt port to D a while back, but it seems to have died out or was buggy. This might be much easier (im new to development so forgive my naivety :)
File append limit?
Hello,
I am running a script that creates a file which lists all the folders in a
directory:
foreach (string name; dirEntries(/Users/josh/, SpanMode.shallow)) {
append(/Users/dirList.txt, name ~ \n);
}
But it seems to stop appending after 255 lines (this particular folder has
350 folders in all).
When trying to read the created file:
auto f = File(/Users/dirList.txt, r);
foreach (string line; lines(f)) {
writeln(line);
}
f.close();
It writes out the lines, but after the last one I get Bus error: 10
Any thoughts on what im missing or doing wrong?
I am currently using D 2.054 on Mac OSX Lion
The script was working with D 2.053 on Mac OSX Snow Leopard
Thanks,
Josh
Re: File append Limit
@Kagamin
What if
foreach(i;0..512) {
append(/Users/dirList.txt, text(line ,i,'\n'));
}
That works, but I misrepresented the problem and found that the following
may be the issue (this looks more like the code im using):
import std.conv, std.stdio;
void main()
{
string[] strArr;
foreach(int i; 0 .. 257) {
strArr ~= text(Line: ~ to!string(i));
}
foreach(string e; strArr) {
writeln(e);
}
}
// OUTPUT for first 87 lines
Line: 2
?O
?O
`O
@O
O
?N
?N
...
ect
...
?@
?@
`@
0@
Line: 88
/* rest of output is as expected */
Changing 257 to 256 gives you what you would expect.
Josh
Interfacing to C
Hello,
I was trying to run the example on the Interfacing to C page (
http://www.d-programming-language.org/interfaceToC.html) and ran into few
issues. To get it to work as is i was .dup(ing) strings into new chars
with defined size and passing those with .ptr. Anyway it seemed like quite a
bit of work for something simple so I added const in the signatures and
things worked much more smoothly:
import std.stdio, std.string;
extern (C) int strcmp(const char* string1, const char* string2);
void main()
{
writeln(myDfunction(foo));
}
int myDfunction(const char[] s) {
return strcmp(std.string.toStringz(s), foo);
}
Was there a reason why the consts were left out?
if this is a typo I'd be happy to update the web page, would be good
experience for a noob like me. (never used GIT before and first time
participating in a community)
Thanks,
Josh
RE: dmdscript osx.mak
Hi Robert and Dmitry, Thanks for your replies and the heads up on the current status of DMDScript! Josh
dmdscript osx.mak
Hello, I apologize if this is the wrong forum to post this question, but I couldn't find a corresponding learn mailing list for DMDScript. I wanted to play around with DMDScript but cant seem to get started. I downloaded the source and attempted to make it via: $ make -f osx.mak But I get the following error: textgen.d(132): Error: cannot implicitly convert expression ~ some string ~ of type string to char[] Am I doing the right thing? Or how do I go about getting building 'ds' so I can run simpleton scripts? Josh
Re: dmd vs rdmd
Thanks Jonathan, that cleared things up for me.
Josh
On Sat, Jun 11, 2011 at 12:00 PM, digitalmars-d-learn-requ...@puremagic.com
wrote:
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than Re: Contents of Digitalmars-d-learn digest...
Today's Topics:
1. dmd vs rdmd (Joshua Niehus)
2. Re: dmd vs rdmd (Jonathan M Davis)
3. Re: dmd vs rdmd (Andrej Mitrovic)
4. char[] to string (Jonathan Sternberg)
5. Re: char[] to string (Jonathan M Davis)
6. Re: DMD Backend: Deciding instructions to use/avoid?
(Nick Sabalausky)
7. Re: char[] to string (bearophile)
--
Message: 1
Date: Fri, 10 Jun 2011 14:28:41 -0700
From: Joshua Niehus jm.nie...@gmail.com
To: digitalmars-d-learn@puremagic.com
Subject: dmd vs rdmd
Message-ID: BANLkTi=TYnN+UuxCr8wj8UwFRjS=ivz...@mail.gmail.com
Content-Type: text/plain; charset=iso-8859-1
Hello,
I am trying to compile code which is composed of two modules (in the same
directory):
main.d
foo.d
foo.d just declares a class Foo which has a string variable bar which i
set to hello and main.d just prints bar's value to the console:
// - main.d ---
import std.stdio, foo;
void main() {
Foo f = new Foo;
writeln(f.bar);
}
When i attempt to compile main.d via:
$dmd main.d
I get undefined symbol errors.
But when I run:
$rdmd main.d
it works as expected.
The only way I could get main.d to compile with just dmd was to compile foo
as a lib first and then compile main.d and passing the foo.a file as an
argument:
$dmd -lib foo.d
$dmd main.d foo.a
Is this normal?
I got the impression from TDPL (Alexandrescu) that the dmd compiler would
automatically search the root directory, find foo.d, work its magic, and
create all the symbols that were defined in foo.d for main.d to compile...
Thanks,
Josh
-- next part --
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--
Message: 2
Date: Fri, 10 Jun 2011 21:50:37 +
From: Jonathan M Davis jmdavisp...@gmx.com
To: digitalmars.D.learn digitalmars-d-learn@puremagic.com
Subject: Re: dmd vs rdmd
Message-ID: 20110610215037.56...@gmx.com
Content-Type: text/plain; charset=utf-8
On 2011-06-10 14:28, Joshua Niehus wrote:
Hello,
I am trying to compile code which is composed of two modules (in the same
directory):
main.d
foo.d
foo.d just declares a class Foo which has a string variable bar which i
set to hello and main.d just prints bar's value to the console:
// - main.d ---
import std.stdio, foo;
void main() {
Foo f = new Foo;
writeln(f.bar);
}
When i attempt to compile main.d via:
$dmd main.d
I get undefined symbol errors.
But when I run:
$rdmd main.d
it works as expected.
The only way I could get main.d to compile with just dmd was to compile
foo
as a lib first and then compile main.d and passing the foo.a file as an
argument:
$dmd -lib foo.d
$dmd main.d foo.a
Is this normal?
I got the impression from TDPL (Alexandrescu) that the dmd compiler would
automatically search the root directory, find foo.d, work its magic, and
create all the symbols that were defined in foo.d for main.d to
compile...
With dmd, you must list every file that you're compiling. The only
exceptions
are that when dealing with libraries, dmd to have the root directory where
the
source is passed to -I, and it needs to have the root directory where the
library is given with -L and -l with the library name (or just the library
directly if you don't want it to search for the library). It's like gcc and
dmc in that respect. It does nothing extra to track down files to compile
for
you. It'll find the source for importing thanks to -I, but it won't compile
it. You must still compile it. You don't normally need -I or -L however,
because dmd.conf (or sc.ini on Windows) already adds the appropriate flags
for
Phobos for you. You only need too specify them yourself when using other
libraries.
rdmd does extra magic to automatically track down all of the files that
main.d
imports and compile them. dmd doesn't do that.
- Jonathan M Davis
--
Message: 3
Date: Sat, 11 Jun 2011 01:08:50 +0200
From: Andrej Mitrovic andrej.mitrov...@gmail.com
To: digitalmars.D.learn digitalmars-d-learn
Re: simple syntax issue with template
I'm trying to create 2 extra method for arrays (range would be
better, though I don't quite understand what is a range)
Although I have some indecipherable (to me) compiler error...
What's wrong with the code below?
==
import std.algorithm;
public:
void remove(T)(ref T[] array, T element)
{
auto index = array.countUntil!(a == b, T[], T)(array, element);
removeAt(index);
}
void removeAt(T)(ref T[] array, sizediff_t index)
{
if(index 0 || index = array.length)
return;
array.replaceInPlace(index, index + 1, []);
}
unittest
{
auto a = [1, 3, 4];
a.remove(3);
assert(a == [1, 4]);
}
==
Hi Lloyd,
why not just use the built in functionality of arrays?
//--
import std.stdio;
void main() {
auto a = [1, 2, 3, 4, 5, 6, 7, 8];
remove(a, 3);
foreach (i; a) {
write(i, );
}
writeln();
}
void remove(T) (ref T[] myarray, int element) {
auto front = myarray[0 .. (element -1)];
auto back = myarray[element .. $];
myarray = front ~ back;
// or simply: myarray = myarray[0 .. (element - 1)] ~ myarray[element ..
$];
}
//--
Josh
dmd vs rdmd
Hello,
I am trying to compile code which is composed of two modules (in the same
directory):
main.d
foo.d
foo.d just declares a class Foo which has a string variable bar which i
set to hello and main.d just prints bar's value to the console:
// - main.d ---
import std.stdio, foo;
void main() {
Foo f = new Foo;
writeln(f.bar);
}
When i attempt to compile main.d via:
$dmd main.d
I get undefined symbol errors.
But when I run:
$rdmd main.d
it works as expected.
The only way I could get main.d to compile with just dmd was to compile foo
as a lib first and then compile main.d and passing the foo.a file as an
argument:
$dmd -lib foo.d
$dmd main.d foo.a
Is this normal?
I got the impression from TDPL (Alexandrescu) that the dmd compiler would
automatically search the root directory, find foo.d, work its magic, and
create all the symbols that were defined in foo.d for main.d to compile...
Thanks,
Josh
