Re: Using core/sys/posix/mqueue.d on FreeBSD

[Arjan via Digitalmars-d-learn]

On Saturday, 6 April 2024 at 12:05:56 UTC, Jonathan M Davis wrote:
Actually, since I'm usually the one who does the FreeBSD ones 
anyway, here you go:


https://github.com/dlang/dmd/pull/16359

The declarations compile, and they should match the ones in C, 
since I copied them over and then tweaked them, but I haven't 
actually tested them.


All that being said, even if they're merged immediately, they 
won't be available as part of druntime until dmd 2.109.0 is 
released (and 2.108.0 was released less than a week ago), so 
you'll probably need to copy them into your own install or use 
the development version of dmd to get the updated bindings if 
you want to use them now.


- Jonathan M Davis


This is awesome, Jonathan! Thanks a lot for your elaboration on 
the issue, no wonder I got confused, and of course the PR! Really 
appreciated.

Thanks!

Re: Ali introduced D at Northeastern University

[Arjan via Digitalmars-d-announce]

On Tuesday, 4 October 2022 at 05:26:53 UTC, Ali Çehreli wrote:
DConf 2022 speaker Mike Shah[1] had invited me to give a 
presentation for the computer science students at Northeastern 
University.


I was there this past Friday having a great time not only 
presenting but also meeting with the students, drinking 
non-virtual beer bought by Steven Schveighoffer. :)


Mike has just posted the video on his YouTube channel:

  https://www.youtube.com/watch?v=0JL9uT_XGZE

Ali

[1] https://dconf.org/2022/#mikes


Really a great presentation!

Re: Serial communication library

[Arjan via Digitalmars-d-learn]

On Saturday, 24 September 2022 at 08:52:42 UTC, Imperatorn wrote:
On Thursday, 22 September 2022 at 12:05:00 UTC, Imperatorn 
wrote:

Hi guys!

What's the best/preferred library to use for serial 
communication (RS)?


Thanks 


I will give onyx-serial a try


Also on code.dlang.org:

https://github.com/NCrashed/serial-port

Depending on you specific needs, using the platform/os api is 
also an option.

Re: What are (were) the most difficult parts of D?

[Arjan via Digitalmars-d-learn]

On Thursday, 12 May 2022 at 11:05:08 UTC, Basile B. wrote:

On Wednesday, 11 May 2022 at 05:41:35 UTC, Ali Çehreli wrote:
What are you stuck at? What was the most difficult features to 
understand? etc.


To make it more meaningful, what is your experience with other 
languages?


Ali


Overhall I think that D was not hard to learn because well 
designed (i.e intuitive).


 I concur..


A few specific points however that I remember

- Certain variant forms of the `is` Expression are not obvious 
(not intuitive), I'm pretty sure I still cant use them without 
a quick look to the specs.


Yes indeed, had to read through the then excellent 
pdf()https://github.com/PhilippeSigaud/D-templates-tutorial by 
Philippe Sigaud (of PEG) to grasp the whole idea first, and still 
have to look it up when the need to use it arises...




- Operator overloading in certain cases was confusing, I 
remember that for one particular form once I had to use your 
book instead of the official specs (when opSlice and opIndex 
are combined)


Indeed same experience. Also opCmp and opEquals caused some 
confusion.


D's [][] !== C's [][],

Range peculiarities w.r.t some algo's (algo want's fwdRange but 
got inputRange but did not have the constraint ea)


lazy vs eager algorithms (the need to call .array)


The main difficulty I had is actually not specific to D. It was 
to accept that a GC is OK.


Nice one.

I recon I have to think much harder sometimes to know where the 
data is and 'who' has access: stack heap tls mutexed or not 
whatever, but find myself almost never asking this question 
anymore in D, which I use(d) to do almost all the time in c++ 
land. The need for it is almost removed by D.

Re: error connecting to mongodb atlas with vibe.d

[Arjan via Digitalmars-d-learn]

On Saturday, 30 April 2022 at 14:29:56 UTC, notsteve wrote:

Hi,

I am trying to setup a simple webserver in D using vibe.d 
(0.9.4) and want to use mongoDB as a database. To achieve this, 
I've set up a mongoDB atlas instance with the following command 
inside the standard app.d file created by vibe.d


```
 string MongoURL = 
"mongodb://username:@cluster0-shard-00-01.gaetq.mongodb.net:27017";


auto client = connectMongoDB(MongoURL);

```

but am getting error [1] below.

Alternatively if I use the following path to the instance

```
string MongoURL =   
"mongodb://username:passw...@cluster0-shard-00-01.gaetq.mongodb.net:27017/myFirstDatabase?ssl=true=false";


```

I get error [2].

I have tried accessing this instance using other programming 
languages and am not having any issues so am sure it is not an 
issue with the database instance. Does anyone have experience 
with this?




Error 1:
```
object.Exception@../../../.dub/packages/vibe-core-1.22.3/vibe-core/source/vibe/core/net.d(777):
 Reached end of stream while reading data.

```


https://github.com/vibe-d/vibe-core/blob/v1.22.3/source/vibe/core/net.d#L777

Apparently, no data is received anymore within the remaining time 
duration.






Error 2:
```
object.Exception@../../../.dub/packages/vibe-d-0.9.4/vibe-d/data/vibe/data/bson.d(813):
 BSON value is type 'int_', expected to be one of [double_]
```


https://github.com/vibe-d/vibe.d/blob/v0.9.4/data/vibe/data/bson.d#L813

There is clearly something wrong with the type expected and 
provided. Check the schemes/layouts.

Re: Our New Pull-Request and Issue Manager

[Arjan via Digitalmars-d-announce]

On Thursday, 24 February 2022 at 13:05:33 UTC, Mike Parker wrote:


Everyone, please congratulate Dennis Korpel on his new job!


Goed bezig! Veel plezier en succes Dennis.

Re: stripping binaries from LDC2

[Arjan via Digitalmars-d-learn]

On Monday, 7 February 2022 at 13:14:19 UTC, max haughton wrote:

On Monday, 7 February 2022 at 12:16:53 UTC, Arjan wrote:
In c++ our release builds are build `-O2 -g` and the resulting 
binaries are stripped with GNU/strip.

Is this also possible with LDC2 generated binaries for D code?
So build D code with `-O2 -g` and then strip the resulting 
binary?


Why build with debug info if you're going to strip it anyway?


The stripped release binaries are going to the client, when a 
problem occurs get a core dump, using the core dump + the 
original binary / symbol gives full debug info off site.


It is common practice.

stripping binaries from LDC2

[Arjan via Digitalmars-d-learn]

In c++ our release builds are build `-O2 -g` and the resulting 
binaries are stripped with GNU/strip.

Is this also possible with LDC2 generated binaries for D code?
So build D code with `-O2 -g` and then strip the resulting binary?

Re: Visual D 1.2.0 supports Visual Studio 2022

[Arjan via Digitalmars-d-announce]

On Saturday, 15 January 2022 at 09:06:23 UTC, Rainer Schuetze 
wrote:

Hi,

Visual D 1.2.0 has just been released.

Major new features:

 * added support for Visual Studio 2022



Thank you very much, Rainer. Much appreciated!

Re: Why I Like D

[Arjan via Digitalmars-d-announce]

On Wednesday, 12 January 2022 at 16:14:54 UTC, Steven 
Schveighoffer wrote:

On 1/12/22 10:41 AM, Adam D Ruppe wrote:
On Wednesday, 12 January 2022 at 15:25:37 UTC, H. S. Teoh 
wrote:
However it turns out that unless you are writing a 
computer

game, a high frequency trading system, a web server


Most computer games and web servers use GC too.

idk about hf trading.


I know for sure that one was written in JAVA, using Azul C4 and 
other tech to maximize performance...




Yeah, I had trouble agreeing with that statement too.


Just wait for Paulo Pinto to join the conversation, he will 
happily refer a lot of tech and products using GC which are high 
performant and very successful ;-)




I wonder if there is just so much fear of the GC vs people who 
actually tried to use the GC and it failed to suit their needs. 
I've never been afraid of the GC in my projects, and it hasn't 
hurt me at all.


I think it stems from experience from long ago when JAVA was HOT 
and sold as the solution of all world problems, but failed to 
meet expectations and was dismissed because they found is was the 
GC what made it fail..


A lot of engineers just repeat the opinion of some guru they 
admire without fact checking.


Although I've seen various serious performance issues with JAVA 
and python software, only once it was related to the GC..

Re: How to loop through characters of a string in D language?

[Arjan via Digitalmars-d-learn]

On Friday, 10 December 2021 at 06:24:27 UTC, Rumbu wrote:

On Wednesday, 8 December 2021 at 11:23:45 UTC, BoQsc wrote:

Let's say I want to skip characters and build a new string.
The character I want to skip: `;`

Expected result:
```
abcdefab
```


Since it seems there is a contest here:

```d
"abc;def;ghi".split(';').join();
```

:)

```d
"abc;def;ghi".tr(";", "", "d" );
```

Re: KQueue and Fibers

[Arjan via Digitalmars-d-learn]

On Friday, 9 April 2021 at 09:00:17 UTC, rashir wrote:

Goodmorning everyone,
I'm trying to understand both Kqueue and Fiber's operation on 
Mac. Why don't I get the correct data as long as I read from 
the socket?
It seems to be reading too early, but Kquue tells me that the 
socket is readable.


...


yield for readibility
kqueue waiting for readibilty
resuming fiber as it's readable 131858
read bytesRead: -1readableAmount:131858 errno:35


35 == EAGAIN This informs the operation (recv) could not complete 
without blocking and should be retried. This does not mean the 
socket is not readable, but the operation would block (for 
whatever reason).

Re: Vibe.d diet template help

[Arjan via Digitalmars-d-learn]

On Sunday, 7 February 2021 at 00:05:51 UTC, Tim wrote:

Hi all,

I'm trying to render a diet template out to a WebSocket as a 
string to be inserted into a specific portion of the currently 
served page. Does anyone know how to go about this?


Is the websocket really needed? Otherwise a plain XHR would be 
advised which would Just implie another handler.

Re: Using a betterC dub package in ordinary D

[Arjan via Digitalmars-d-learn]

On Friday, 8 January 2021 at 20:19:59 UTC, Bastiaan Veelo wrote:


Off topick, the original js implementation is documented to not 
generate results that are guaranteed to be correct. I could not 
find information on what the conditions are that cause 
deviations, and how large these then can be. Do you have an 
idea about this or experience with accuracy of the algorithm? I 
am looking into whether earcutd can replace GLU tesselation. We 
use the result for engineering purposes (not only 
visualisation) and correctness is important to us.


I've used documentation and implementations from David Eberly at 
https://www.geometrictools.com/ and also on github nowadays to 
get 'correct' or at least 'predictable' behavior for various 
geometric challenges.


Using this library solved various issues for us. The 
documentation is great!

Re: Nasty supprise when using c 'anonymous struct and union' in D with 'static struct'

[Arjan via Digitalmars-d-learn]

On Tuesday, 29 December 2020 at 17:49:20 UTC, Steven 
Schveighoffer wrote:

On 12/29/20 12:13 PM, Arjan wrote:
On Tuesday, 29 December 2020 at 14:42:07 UTC, Steven 
Schveighoffer wrote:

On 12/29/20 7:38 AM, Arjan wrote:

see https://en.cppreference.com/w/c/language/struct


structs only add context pointers if nested in functions (and 
even then, only if it's not POD). If nested in structs, 
classes, or unions (or anything else), then no context pointer 
is added.


So the answer is, don't use static.


That is what I discovered indeed. Thanks both for answering and 
the additional information. This could however be made more 
explicit and clear in the documentation.

Re: Nasty supprise when using c 'anonymous struct and union' in D with 'static struct'

[Arjan via Digitalmars-d-learn]

On Tuesday, 29 December 2020 at 14:42:07 UTC, Steven 
Schveighoffer wrote:

On 12/29/20 7:38 AM, Arjan wrote:

see https://en.cppreference.com/w/c/language/struct


I added in some printouts of the addresses of the variables.

It appears that if you add static to the struct, it now becomes 
a static member of the union, which means it's not an instance 
variable, and is now a thread-local variable. Its address 
doesn't even coincide remotely with the address of v1.


What is the equivalent behavior for C that you are expecting? 
The usage of "static struct" doesn't appear in that page you 
linked to.


On the C/C++ side there is no static. I added those on the D side 
to to make sure there is no context pointer being added, since 
that will change the layout and size of struct. (in the c/c++ 
code those unions and structs are nested several levels deep)


Based on this: https://dlang.org/spec/struct.html#nested
I expected to have the equivalent of C behavior in D by using the 
static keyword, which in this case just caused havoc. So the 
other way around.

Nasty supprise when using c 'anonymous struct and union' in D with 'static struct'

[Arjan via Digitalmars-d-learn]

see https://en.cppreference.com/w/c/language/struct

It seems the 'static' must NOT be used here to get the equivalent 
behavior of c, when left in the assertions will fail.


Is this expected?

```
unittest
{

struct W
{
align(1):
long k;
long l;
}

struct V
{
align(1):
union // anonymous union
{
/*static*/ struct // anonymous structure
{
long i;
long j;
}
W w;
   }
   int m;
}

V v1;

v1.i = 2;
assert( 2 == v1.w.k );
v1.w.l = 5;
assert( 5 == v1.j );
}
```

name enum vs static named enum

[Arjan via Digitalmars-d-learn]

What is the usage of `static` in this? :
```
static enum Status
{
NONE,
BUSY,
...
}
```

Dub cmdline overrides?

[Arjan via Digitalmars-d-learn]

Is there a cmdline switch to DUB to override certain dub.sdl 
settings for a dependency? Like the addition or override to lib 
dirs or link-libs?


For example once and a while I run into linking issues with 
symbols not found due to the `soname` being different on my 
system than specified in some dependency dub.sdl. Or the lib path 
to the shared lib is different.

Re: How to use bootstrap with vibe.d.

[Arjan via Digitalmars-d-learn]

On Thursday, 5 November 2020 at 16:22:11 UTC, Alaindevos wrote:
This is from the bootstrap documentation. I think you must 
adapt this to .dt files.


dt files are basically pugjs https://pugjs.org/ files.

When you use vscode with this extension: 
https://marketplace.visualstudio.com/items?itemName=ditto.convert-html-to-pug


It becomes easy to convert from html to pug/dt.

Re: How to use bootstrap with vibe.d.

[Arjan via Digitalmars-d-learn]

On Thursday, 5 November 2020 at 16:22:11 UTC, Alaindevos wrote:
This is from the bootstrap documentation. I think you must 
adapt this to .dt files.

```
...
...
html( lang='nl' )
  head
title #{pageTitle}
meta( charset="utf-8")
meta( name="viewport"
  content="width=device-width, initial-scale=1, 
shrink-to-fit=no" )
link( rel="stylesheet" 
href="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css;
  
integrity="sha384-ggOyR0iXCbMQv3Xipma34MD+dH/1fQ784/j6cY/iJTQUOhcWr7x9JvoRxT2MZw1T" crossorigin="anonymous")

//- fontawesome icons from localhost
link( rel="stylesheet" href="/css/fontawesome.css" )
link( rel="stylesheet" href="/css/brands.css" )
link( rel="stylesheet" href="/css/solid.css" )

  body
//- main page0
div.d-flex.flex-column.h-100
  //- nav bar
  nav.navbar.navbar-expand-sm.sticky-top
...
```

Like this.

Re: Symmetry Investments and the D Language Foundation are Hiring

[Arjan via Digitalmars-d-announce]

On Sunday, 30 August 2020 at 14:13:36 UTC, Mike Parker wrote:
Looking for a full-time or part-time gig? Not only is Symmetry 
Investments hiring D programmers, they are also generously 
funding two positions for ecosystem work under the D Language 
Foundation. And they've put up a bounty for a new DUB feature. 
Read all about it here:


https://dlang.org/blog/2020/08/30/symmetry-investments-and-the-d-language-foundation-are-hiring/


Fantastic! Thanks Symmetry!

Re: D binary io functions

[Arjan via Digitalmars-d-learn]

On Sunday, 30 August 2020 at 06:00:20 UTC, Andy Balba wrote:
going nuts trying to figure out which D functions will 
read/write binary files


see this blog:
http://nomad.uk.net/articles/working-with-files-in-the-d-programming-language.html

Re: Visual D 1.0.0 released

[Arjan via Digitalmars-d-announce]

On Sunday, 5 July 2020 at 19:02:23 UTC, Rainer Schuetze wrote:



I have added some documentation and screenshots here: 
https://rainers.github.io/visuald/visuald/Debugging.html#customization


Thank you very much, Rainer. Your efforts on this and the gc are 
really appreciated.

Re: scope guard question

[Arjan via Digitalmars-d-learn]

On Tuesday, 30 June 2020 at 12:18:14 UTC, Steven Schveighoffer 
wrote:

On 6/30/20 2:56 AM, Arjan wrote:
On Monday, 29 June 2020 at 22:47:16 UTC, Steven Schveighoffer 
wrote:

[...]


Thanks for the assurance. The spec does state it like this:
```
The ScopeGuardStatement executes NonEmptyOrScopeBlockStatement 
at the close of the current scope, rather than at the point 
where the ScopeGuardStatement appears.

```
Which is correct, but there is no single example with a return 
where the ScopeBlockStatement interferes with the return.


I started wondering about this since I hit a bug in a piece of 
code.


I can see where it would be confusing, and it could probably 
contain an example and clarification.


-steve


That would certainly be helpfull.

Re: scope guard question

[Arjan via Digitalmars-d-learn]

On Monday, 29 June 2020 at 22:47:16 UTC, Steven Schveighoffer 
wrote:
Yes. The return statement is inside the scope of the function, 
so it runs before the scope is exited. Are you saying the spec 
doesn't say that?


Thanks for the assurance. The spec does state it like this:
```
The ScopeGuardStatement executes NonEmptyOrScopeBlockStatement at 
the close of the current scope, rather than at the point where 
the ScopeGuardStatement appears.

```
Which is correct, but there is no single example with a return 
where the ScopeBlockStatement interferes with the return.


I started wondering about this since I hit a bug in a piece of 
code.

scope guard question

[Arjan via Digitalmars-d-learn]

```
void main()
{
  import std.stdio;
  auto f = (){
string[] t;
{ // inner scope
  t ~= "hello";
  scope( exit ) t ~= "world";
} // inner scope exit
return t;
  };

  f().writeln; // ["hello", "world"]
}
```
removing the inner scope in f() gives ["hello"]

So when no inner scope is present, the scope exit 'runs' after 
the return? Is that indeed expected behavior according to the 
specification?

Re: On the D Blog: Lomuto's Comeback

[Arjan via Digitalmars-d-announce]

On Thursday, 14 May 2020 at 13:26:23 UTC, Mike Parker wrote:
After reading a paper that grabbed his curiosity and wouldn't 
let go, Andrei set out to determine if Lomuto partitioning 
should still be considered inferior to Hoare for quicksort on 
modern hardware. This blog post details his results.


Blog:
https://dlang.org/blog/2020/05/14/lomutos-comeback/

Reddit:
https://www.reddit.com/r/programming/comments/gjm6yp/lomutos_comeback_quicksort_partitioning/

HN:
https://news.ycombinator.com/item?id=23179160


A follow up article on this:

https://news.ycombinator.com/item?id=23363165
https://blog.reverberate.org/2020/05/29/hoares-rebuttal-bubble-sorts-comeback.html

Vibed unix socket

[Arjan via Digitalmars-d-learn]

I noticed vibe has gained support for unix sockets. What is 
unclear (at least from API docs) how to create a raw unix stream 
socket.

should `listenTCP` and `connectTCP` be used?
Seems weird because those require a 'port'..

Re: Visual D debugger tuple _expand_field

[Arjan via Digitalmars-d-debugger]

On Sunday, 23 February 2020 at 17:22:13 UTC, Rainer Schuetze 
wrote:



On 20/02/2020 23:03, BetaDamnit wrote:

_expand_field

takes up a huge amount of space for no reason. I think tuple 
scan be safely listed like arrays. We know they are tuples, no 
need to display _expand_field=, it just takes up a lot of 
space in the display for no reason, specially if there are 
several elements in the tuple.




This is the result of the compiler lowering the tuple to a 
number of variables ___field_. No info is 
generated about this being a structure-like compound.


I have added support to the debugger to recombine these 
variables to an expandable array, but it wasn't actually 
trivial: 
https://github.com/rainers/mago/commit/451f856fd70a311460af1153ce1a1647059b5d89


It will be in the next release.


Rainer, you worth more money! Thank you for your relentless 
effort and support, it is highly appreciated, at least by me.

Thanks!
Arjan

Re: Program exited with code -11

[Arjan via Digitalmars-d-learn]

On Wednesday, 18 September 2019 at 13:22:03 UTC, Danny Arends 
wrote:

Hey all,

"Program exited with code -11"


Not signal 11? On unix/linux I assume?

Re: Recommendations for best JSON lib?

[Arjan via Digitalmars-d-learn]

On Sunday, 21 April 2019 at 02:09:29 UTC, evilrat wrote:
On Saturday, 20 April 2019 at 20:44:22 UTC, Guillaume Piolat 
wrote:

On Saturday, 20 April 2019 at 18:49:07 UTC, Nick Sabalausky


I also tried experimental std json, asdf and vibe.d.
The only one that worked for me is vibe.d JSON subpackage, and


What was the problem with asdf? I've succesfully used it in the 
past.

Re: Half-baked thought: Out-of-process asserts

[Arjan via Digitalmars-d]

On Tuesday, 4 September 2018 at 03:39:04 UTC, Nick Sabalausky 
(Abscissa) wrote:

It seems pretty well established around here that:

1. Doing anything after a process has entered an unknown state 
is dangerous, and the more activity, the more danger (Note 
also, the transition to an unknown state actually occurs 
*before* any assert which is intended to detect it.)


[...]


Reminds me of google breakpad: 
https://chromium.googlesource.com/breakpad/breakpad/+/master/docs/

install.sh gives Invalid signature error

[Arjan via Digitalmars-d]

Trying to execute the install.sh on a centos7.5 system gives an 
error:
Invalid signature 
http://downloads.dlang.org/releases/2.x/2.080.1/dmd.2.080.1.linux.tar.xz.sig


For each version I tried.

Whats wrong?

Re: Remember the Vasa! by Bjarne Stroustrup

[Arjan via Digitalmars-d]

On Tuesday, 29 May 2018 at 01:46:47 UTC, Walter Bright wrote:

A cautionary tale we should all keep in mind.

http://open-std.org/JTC1/SC22/WG21/docs/papers/2018/p0977r0.pdf

https://www.reddit.com/r/programming/comments/8mq10v/bjarne_stroustroup_remeber_the_vasa_critique_of/

https://news.ycombinator.com/item?id=17172057


Hmm reminds me of this Scott Meyers talk:
https://www.youtube.com/watch?v=ltCgzYcpFUI=youtu.be

Re: Favorite GUI library?

[Arjan via Digitalmars-d]

On Tuesday, 24 April 2018 at 18:43:54 UTC, H. S. Teoh wrote:

This reminds me of Nick Sabalausky's rant once that back in the 
80's we used to run programs on 64KB RAM and 8kHz CPUs, and 
lived with the slow performance, and nowadays we have GB's of 
RAM and multicore GHz CPUs, and we are finally able to write 
web apps that do basically the same things with about the same 
slow performance as in the 80's (but with many orders of 
magnitude greater resource consumption).  Software has come a 
long ways indeed. :-D



T


https://www.artima.com/cppsource/how_to_go_slow.html

dub default settings

[Arjan via Digitalmars-d-learn]

I find myself typing over and over again the same things like '-a 
x86_64'. Is it somehow possible to set those defaults?

Re: D beyond the specs

[Arjan via Digitalmars-d]

On Friday, 16 March 2018 at 19:27:40 UTC, Walter Bright wrote:

On 3/16/2018 4:44 AM, Chris wrote:
Would it be possible to find out at DConf in Munich why 
exactly D is so popular in Germany (my impression) and in 
other countries of Europe (and that general post code) like 
France, Italy, GB, Romania and Russia etc.?


My old company's product, Zortech C++, was also very popular in 
Germany, England, and Japan. I don't know why.


And a certain spot in the Netherlands, because at the time it 
outperformed all the others like Borland Watcom IBM/visual-age 
ms-visual-c++ and others at compilation speed and most of the 
time in execution speed as well. Besides since we used multiple 
compiler on our code base symantec/digitalmars often reported 
violations were the other happily accepted the code (and produced 
wrong code) And the incident response time from you was just 
marvelous, reported an issue, next morning a fixed compiler 
version in the emailbox!


Beside that, I really appreciated the so called IDDE and 
accompanied srcs of libs. It was imo much much better than VC++ 
at the time. Have used it for a very long time even after 
Symantec ditched it. (borland f* up theirs by forcing the C++ 
builder upone us)

Re: howto run unittest of a single module in dub driven project?

[Arjan via Digitalmars-d-learn]

On Monday, 5 March 2018 at 11:26:37 UTC, Atila Neves wrote:

On Sunday, 4 March 2018 at 10:43:06 UTC, Arjan wrote:
Is it somehow possible to only run the unittests of a single d 
file within a dub project? Of course without resorting to 
typing the complete commandline with all versions includes 
switches etc.


You could use unit-threaded:

http://code.dlang.org/packages/unit-threaded

You'd still need to build everything, but `dub test` would take 
care of that. I started working on, and need to get back to, a 
way of only building one module and needed dependencies.


Atila


Thanx will take a look at it and yes that would be exactly what I 
was after!

Re: howto run unittest of a single module in dub driven project?

[Arjan via Digitalmars-d-learn]

On Sunday, 4 March 2018 at 16:51:06 UTC, Basile B. wrote:
[1] 
https://github.com/BBasile/Coedit/commit/f8c5e686c8c6aaa7dc2c770121767e3e59806a0e


Thanks for givin me the idea original poster.


Guess I will have to give coedit another try then.. ;-)

So you do use dub behind the scenes so it seems? Care to 
elaborate a little on how you achieved this?

howto run unittest of a single module in dub driven project?

[Arjan via Digitalmars-d-learn]

Is it somehow possible to only run the unittests of a single d 
file within a dub project? Of course without resorting to typing 
the complete commandline with all versions includes switches etc.

Re: Debugging bad requests with vibe

[Arjan via Digitalmars-d-learn]

On Friday, 9 February 2018 at 11:46:31 UTC, Nicholas Wilson wrote:

On Friday, 9 February 2018 at 08:06:53 UTC, Seb wrote:
On Thursday, 8 February 2018 at 17:09:44 UTC, Nicholas Wilson 
wrote:
Is there a way I can see/log what requests are being made? I 
can change both the client and server.


-v and -vv


All that gives me is a bunch of
[FAC3BFF6:FAC451F6 dia] Actively closing TCP connection

is there a way to get the JSON being sent?


Wireshark?

Re: Vibe.d rest & web service?

[Arjan via Digitalmars-d-learn]

On Wednesday, 7 February 2018 at 20:23:10 UTC, Nicholas Wilson 
wrote:
On Wednesday, 7 February 2018 at 19:50:31 UTC, Jacob Carlborg 
wrote:

Have you tried this?


No. But apart from the fact that I forgot to make the class 
inherit from an interface to that the rest interface would 
actually compile, the web interface is routed before the rest 
interface and so the rest interface would never be reached 
since the methods are all the same and the REST's are shadowed 
by the web's .


Makes me wonder whether or not vibe does honor the http request 
Accept headers?

e.g.: application/json or application/javascript or text/html etc.

Re: Release D 2.078.1

[Arjan via Digitalmars-d-announce]

On Wednesday, 31 January 2018 at 15:58:02 UTC, Atila Neves wrote:
On Thursday, 25 January 2018 at 20:11:54 UTC, Rainer Schuetze 
wrote:



On 25.01.2018 14:54, Atila Neves wrote:

[...]


Visual Studio is supposed to be detected by dmd now, either 
from the environment or from the registry.


What errors do you get? Try running with -v to show the linker 
command line.


$ dub init
$ dub build --arch=x86_64
Performing "debug" build using C:\D\dmd2\windows\bin\dmd.exe 
for x86_64.

example ~master: building configuration "application"...
Linking...
LINK : fatal error LNK1104: cannot open file 'shell32.lib'

-v shows that it's linking like so:

C:\D\dmd2\windows\bin\dmd.exe 
-of.dub\build\application-debug-windows-x86_64-dmd_2078-70A25404824ECE07D24A9F4D03E746CD\example.exe .dub\build\application-debug-windows-x86_64-dmd_2078-70A25404824ECE07D24A9F4D03E746CD\example.obj -m64 -g


Should I file a bug for dmd or the installer? Are 64-bit dub 
builds not done by CI on Windows? This is pretty embarassing.


Atila


By any chance, is this on a corperate machine? I've hit the same 
issue seems to do with enforced windows group-policy which 
disables registry access for certain type of applications at my 
place.

Re: Adding Markdown to Ddoc

[Arjan via Digitalmars-d]

On Thursday, 7 December 2017 at 10:21:21 UTC, Jacob Carlborg 
wrote:

On 2017-12-06 05:11, Walter Bright wrote:

https://help.github.com/articles/basic-writing-and-formatting-syntax/

Anyone interested in picking up the flag?

(I know this has come up before, and I've been opposed to it, 
but I've changed my mind.)


Finally :), this is awesome. Should we implement standard 
markdown, GitHub markdown or some other extension?


Dang! And there you have it: endless complains and issues about 
the choosen flavour comming ahead of us now... :-(


I would suggest: AsciiDoc! Why? 
see:http://ericholscher.com/blog/2016/mar/15/dont-use-markdown-for-technical-docs/

Re: R.filter!(..).sort!(..)

[Arjan via Digitalmars-d-learn]

On Tuesday, 28 November 2017 at 13:24:09 UTC, Steven 
Schveighoffer wrote:

On 11/28/17 8:10 AM, Arjan wrote:

[...]


The library is correctly telling you that your filtered range 
is not random access. It can't be, because it lazily applies 
the filter (that is, it filters on each element as you popFront 
them). So how can it know what the e.g. 3rd element is, if you 
haven't run any filters yet?


The array version works because you are applying the filter 
completely and storing the results elsewhere in one step.


-Steve


Well I would have liked an error msg something like: 
isRandomAccessRange!Range for Range=.. failed! Or unable to 
sort!() a lazy Range.

R.filter!(..).sort!(..)

[Arjan via Digitalmars-d-learn]

When applying a sort!() on a filtered range I get this compiler 
error:


Error: template std.algorithm.sorting.sort cannot deduce function 
from argument types !((a, b) => a.name < 
b.name)(FilterResult!(__lambda3, RangeT!(Array!(IssueType, 
candidates are:

C:\D\dmd2\windows\bin\..\..\src\phobos\std\algorithm\sorting.d(1851,1):std.algorithm.sorting.sort(alias less = "a < 
b", SwapStrategy ss = SwapStrategy.unstable, Range)(Range r) if ((ss == SwapStrategy.unstable && 
(hasSwappableElements!Range || hasAssignableElements!Range) || ss != SwapStrategy.unstable && hasAssignableElements!Range) 
&& isRandomAccessRange!Range && hasSlicing!Range && hasLength!Range)

But it seems the problem is with the filter!() result not being a 
isRandomAccessRange!Range because:
R.filter!(..).array.sort!(..) just works (by copying the filter 
results in a array).


Iaw is the compiler error msg wrong? Or i'm I wrong?

Re: [OT] Windows dying

[Arjan via Digitalmars-d]

On Tuesday, 7 November 2017 at 13:59:26 UTC, codephantom wrote:

But I think what really made it take off so fast and 
unexpectadly, was the convergence of mobile devices, mobile 
communication technology (i.e wifi, gps and stuff), and of 
course the internet... as well as the ability to find cheap 
labour overseas to build the produces on mass.


The thing is apple combined (at the right time) the various 
things which made it very succesfull.
- they learned from napstar, people are interessted in (buying) a 
single song => iPod + iTunes

- they 'copied' that concept over to the iPhone with appstore

For both they enabled not only business for themselfes but 
created platforms on which many parties external to apple were 
able to create succesfull business on.


iaw its not the device itself what made it succesfull, its 
because it is part of a 'platform'

Re: London senior DevOps job and two London [D-ish] developer roles

[Arjan via Digitalmars-d-announce]

On Thursday, 19 October 2017 at 20:01:20 UTC, Laeeth Isharc wrote:

Hi.

Symmetry Investments is looking to hire ...
Please feel free to drop me a line if you're interested or know 
of someone who might be - for this role or for the others.


How would one contact you?

Re: debugging in vs code on Windows

[Arjan via Digitalmars-d-learn]

On Tuesday, 17 October 2017 at 03:10:52 UTC, Dmitry wrote:

On Tuesday, 17 October 2017 at 02:32:49 UTC, Domain wrote:

Can you share your tasks.json and launch.json?


tasks.json - I don't have this file.
launch.json:
{
"version": "0.2.0",
"configurations": [

{
"name": "(Windows) Launch",
"type": "cppvsdbg",
"request": "launch",
"program": "${workspaceRoot}\\parser.exe",
"args": [],
"stopAtEntry": false,
"cwd": "${workspaceRoot}",
"environment": [],
"externalConsole": true
}
]
}

Also I have changed preferences:
"debug.allowBreakpointsEverywhere": true,

Status bar:
x86_64 debug dmd


Before this will work, one must install the Microsoft C/C++ Addin 
i.e. ms-vscode.cpptools.

Start debugging and select the C++ debugger.

Re: Calling C++ "void foo(Klass&)"

[Arjan via Digitalmars-d]

On Thursday, 10 August 2017 at 00:32:40 UTC, Mengu wrote:
my second question is: i have no idea what's going on in this 
file: 
https://github.com/whoshuu/cpr/blob/master/include/cpr/body.h 
i'd appreciate some pointers.


A new 'type' named Body which IS-A std::string is defined.
To construct a Body there are various options:
The ctors 'default': Body(), 'copy': Body(const Body&) and 
'move': Body(Body&&) ctors are using the compiler generated 
default implementation.

The same is true for the assignment operators =
Then a few explicit conversion ctors are defined to construct a 
Body from a const char* string and std::string. Explicit means 
the compiler is not allowed to implicit convert to std::string or 
const char* for provide args not being a const char* or 
std::string but for which a conversion exists.


Since the h file also contains the definitions, the compiler must 
inline the code for the Body ctors and assignment operator. It 
also means not C/cpp file is needed since the function bodies are 
already in the h file.


HTH

Re: Visual Studio Code code-d serve-d beta release

[Arjan via Digitalmars-d-announce]

On Wednesday, 9 August 2017 at 05:24:37 UTC, Dmitry wrote:

On Tuesday, 8 August 2017 at 17:13:18 UTC, WebFreak001 wrote:
Use my other extension `code-debug` (or `Native Debug`) for 
that


Is there somebody who used it successfully on Windows?


You mean the code-debug? No because there is at least one bug in 
the mago-mi, I once had a fix for it but seem not to have made it 
into a PR. Besides that bug(fix) I did run into other issues 
preventing succesfull use, unfortunately.


code-d yes works fine on windows though, as on linux, one must 
build dcd-server and dcd-client, dscanner, (dfmt) and put it in 
the search path or provide the locations to those executables in 
the settings file. (did not yet try the new code-d serve-d)

Re: Visual Studio Code code-d serve-d beta release

[Arjan via Digitalmars-d-announce]

On Tuesday, 8 August 2017 at 17:27:30 UTC, Johannes Pfau wrote:

Am Tue, 08 Aug 2017 17:13:18 +
schrieb WebFreak001 :


On Tuesday, 8 August 2017 at 08:03:05 UTC, Arjan wrote:
> Small request: could the setting "d.stdlibPath" be inferred 
> from the compiler in use? DMD and LDC both have a conf file 
> in which the paths are already set.


oh cool I didn't know that, is there a standard path to where 
these conf files are though?


The D frontend (and therefore all compilers) already has code 
to print the import paths. Unfortunately this code is only used 
when an import is not found:

--
test.d:1:8: Fehler: module a is in file 'a.d' which cannot be 
read

 import a;
^
import path[0] = /usr/include/d
import path[1]
= /opt/gdc/lib/gcc/x86_64-unknown-linux-gnu/4.9.4/include/d
--

It should be trivial though to refactor this code and add a 
command-line switch to dump the import path. See Module::read 
in dmodule.c. If Walter opposes adding this to DMD (one more 
command line switch!) we could probably still add it to GDC 
glue. This code is all you need:


if (global.path)
{
for (size_t i = 0; i < global.path->dim; i++)
{
const char *p = (*global.path)[i];
fprintf(stderr, "import path[%llu] = %s\n", 
(ulonglong)i, p);

}
}


-- Johannes


Even better!
But when this is rejected,
one could also trigger it by feeding a deliberate wrong file to 
the compiler...
Another option is to build a simple hello.d with the -v flag 
which will reveal the location of the binary the location of the 
config file used and also the import paths and lib paths so it 
seems.

Re: Visual Studio Code code-d serve-d beta release

[Arjan via Digitalmars-d-announce]

On Saturday, 5 August 2017 at 22:43:31 UTC, WebFreak001 wrote:

...


Thanks a lot!

Will give it a try.

Small request: could the setting "d.stdlibPath" be inferred from 
the compiler in use? DMD and LDC both have a conf file in which 
the paths are already set.


What about the debugging experience? Plans to integrate that as 
well?


Keep up the good work!

Re: Are there any known remaining deadlock bugs in OPTLINK?

[Arjan via Digitalmars-d]

On Thursday, 25 May 2017 at 14:16:41 UTC, Vladimir Panteleev 
wrote:



- Does OPTLINK use threads or thread synchronization primitives?
- Is anyone aware of any threading/deadlock bugs in OPTLINK?
- Any known workarounds? Like setting CPU affinity?


Back in the days when I was using the DigtalMars C++ compiler on 
almost a daily basis I always setted CPU affinity on HT/multicore 
machines for optlink.exe to avoid lockups.


I'm not aware whether or not there have been any fixes or changes 
to optlink.exe over the past 8 years regarding this issue.

Re: Binderoo - we're open sourcing our binding system

[Arjan via Digitalmars-d]

On Tuesday, 16 August 2016 at 14:31:54 UTC, Ethan Watson wrote:
Slides are up at 
http://www.slideshare.net/EthanWatson5/d-using-an-emerging-language-in-quantum-break


I'm getting an error and can't see the slide content. Is it just 
me?

Re: How are you enjoying DConf? And where to go next?

[Arjan via Digitalmars-d]

On Friday, 6 May 2016 at 14:13:35 UTC, Andrei Alexandrescu wrote:
The atmosphere here is great, and I'm curious how it feels for 
those who are watching remotely. Is the experience good? What 
can we do better?


Also: we're talking about the DConf 2017 location. Please share 
any initial thoughts!



Thanks,

Andrei


I was not able to watch live much. But the parts I did were OK. 
Audio was good enough, video I would have liked to be a bit 
better, but do-able. A very good idea to have the slides 
available upfront!


I watched the most in the made available streams afterwards. Easy 
to pick and select the topics of interest. IMO it is great to 
have the content available right after/during the current day.


The atmosphere was even noticeable in the video stream, for me at 
least. To me it seems like a really great and inspirational 
conference!


Location, personally doesn't matter much to me since I'm most 
probably not able to attend anyway. But maybe Japan/Korea?


Topics and niveau, you did not ask but will give my opinion 
anyway, the diversity is good, the level of the talks I saw were 
for people not to intemit with the language and its eco system 
possibly a bit to high / abstract. I don't know whether or not 
there is a specific group targeted by dconf but when one of its 
(main) purposes is to attract new people from other language- eco 
systems, then IMO there should be given a bit more thought on the 
content topics and niveau.

When this is not the purpose then its all fine.

About attracting people to D, my experience is that beside the 
language zealots which will never change to different language 
eco system, most developers do not look around and select the 
best tools for the job at hand, they just look back into to their 
experience-toolbox and start solving the problem using the tools 
and technologies their familiar with, even though better tools 
are readily available. IMO D offers for a lot, a near perfect fit 
for a lot of problems, but fails in 'marketing' department. Most 
professionals I met never heard of D or never tried it (to much 
hassle). When they try it out it is not only the first 5 minutes, 
but the first project that matters. Most of them never finish 
that project in D

Feedback I get:
- integration in tooling not good enough (VisualD is of help, but 
seems to fail)

- debugging problems(!!!)
- documentation for beginners not easy to find or follow.
- just to much of a hassle

I hope we can improve on this.

Arjan

Re: DConf keynote speaker ideas

[Arjan via Digitalmars-d]

On Tuesday, 17 November 2015 at 18:47:58 UTC, Andrei Alexandrescu 
wrote:
I'm thinking of inviting a notable industry luminary to deliver 
a conference keynote. Please reply to this with ideas! -- Andrei


Chris Lattner
Howard Hinnant

Bill Joy
Ray Kurzweil

Re: Shout out to D at cppcon, when talkign about ranges.

[Arjan via Digitalmars-d]

On Wednesday, 30 September 2015 at 01:55:43 UTC, deadalnix wrote:
On Wednesday, 30 September 2015 at 01:45:49 UTC, deadalnix 
wrote:

https://www.youtube.com/watch?v=mFUXNMfaciE

From
http://wiki.dlang.org/Component_programming_with_ranges

Congrat H. S. Teoh


Shared on reddit: 
https://www.reddit.com/r/programming/comments/3mwu4e/cppcon_2015_eric_niebler_ranges_for_the_standard/


Also disappointed by Herb talk. It was very interesting, but he 
was blatantly dishonest when comparing other languages.


He goes to claim GC in other languages is costly (it is) but 
then goes to propose "cost free" smart pointer kind of solution 
that are not cost free. Many paper show how both solution are 
on a continuum and he MUST know this.


I had the same feeling, as a lot of the ideas clearly comes from 
languages (like D / Rust / ..) but were presented to the public 
as inventions of their own.

Re: This Week in D #23 - Interview with Dmitry Olshansky, dmd beta, std.experimental.color

[Arjan via Digitalmars-d-announce]

On Monday, 29 June 2015 at 03:46:55 UTC, Adam D. Ruppe wrote:

http://arsdnet.net/this-week-in-d/jun-28.html


great interview.

Re: best way to interface D code to Excel

[Arjan via Digitalmars-d-learn]

On Wednesday, 17 June 2015 at 18:35:36 UTC, Laeeth Isharc wrote:

Hi.

Any thoughts on the best way to write D functions that I can 
call from Excel?  I am completely unfamiliar with Windows 
programming and COM (last time I wrote this kind of thing was 
in the mid-90s I think using xloper and C).


The easiest way for now seems to be via pyxll and pyd.  Wrap 
the D function using pyd and then call it from an annotated 
pyxll python function.  That's probably good enough for a 
start, but it requires python to be installed on each user 
machine which I would rather not have as the end game - just a 
single xll would be perfect.


I know D has support for COM - not sure of its status.  And 
there was a Microsoft chap who posted here a couple of years 
back - wonderful templated code that made it easy to write this 
kind of thing.  Unfortunately he wasn't able to share it 
publicly.


So I would like to write:
1. worksheet function that will function picker and have help 
text in the picker.  In general will take some combination of 
strings, doubles and arrays of doubles as arguments and return 
either string, double, or range/matrix of doubles.
2. vba function with similar kinds of arguments and return 
values.


I know it's easy to do this with double** and the like - at 
least on the VBA side.  I got a bit stuck navigating the 
headers when it comes to Excel strings.


If anyone has some source they could point me to, and some 
reading material then I would very much appreciate it.  This 
might help facilitate adoption of D within a large financial 
institution, but it is early days yet.  And I would guess this 
is a common sort of use for people operating in a financial 
environment, since people are still attached to spreadsheets.


Thanks.


Laeeth.


You actually want to create ActiveX/COM components in D?
See the 'COM in plain C' articles by Jeff Glatt which demonstrate 
how to do it using C. This might give you the information needed 
to do it using D.

http://www.codeproject.com/Articles/Jeff-Glatt#articles.

An idea to accelerate a little might be to use Visual Studio with 
C++ to create ActiveX/COM interfaces, wrappers, etc of the 
components and do the actual implementation of the interfaces in 
D.


Books (old): Inside COM and Essential COM might be handy to 
get hold of.


HTH.
Arjan

Re: A few notes on choosing between Go and D for a quick project

[Arjan via Digitalmars-d]

One underused resource seems to be all the examples bearophile 
has put on Rosetta Code:


http://rosettacode.org/wiki/Category:D


Indeed, I found myself frequently looking though these examples. 
Thank you bearophile!


If he, Adam, or some other proficient D user were to do a 
weekly series breaking down each of those 733 examples one at a 
time- what idioms were used, why certain variations were more 
efficient- that could go a long way to introduce the language 
and its idioms to beginners.


+1000

Re: Dutch D Meetup

[Arjan via Digitalmars-d]

On Monday, 23 February 2015 at 21:07:04 UTC, George Sapkin wrote:
Seems like there are some local meetups starting across the 
globe, but no Dutch one so far. Are there any D users from the 
Netherlands that would want to meetup and share their D 
stories? Cheers.


I would surely come. Though have not really anything to share yet.

Re: dub.json dependencies per configuration?

[Arjan via Digitalmars-d-learn]

On Wednesday, 11 February 2015 at 01:06:02 UTC, Mike Parker wrote:

On 2/11/2015 8:38 AM, Arjan wrote:
Snippet from: 
https://github.com/buggins/ddbc/blob/master/dub.json#L7


ddbc has a dependencies on mysql-native: =0.0.12. But 
this is

only true for configurations: MySQL.
Is it allowed to put the dependency within the configuration 
section for

MySQL?.


Yes.


I moved the dependencies into the configuration of MySQL, but 
no dice.
It is accepted by dub but does not make a difference when 
selecting an other configuration. e.g.
dub build -f -c SQLite -a x86 still fetches and builds the 
mysql-native.


Is this behavior of dub expected or a bug?

dub.json dependencies per configuration?

[Arjan via Digitalmars-d-learn]

Snippet from: 
https://github.com/buggins/ddbc/blob/master/dub.json#L7


ddbc has a dependencies on mysql-native: =0.0.12. But this 
is only true for configurations: MySQL.
Is it allowed to put the dependency within the configuration 
section for MySQL?.


dependencies: {
mysql-native: =0.0.12
},
targetPath: lib,
targetType: staticLibrary,
configurations: [
{
name: full,
versions: [USE_MYSQL, USE_SQLITE, USE_PGSQL],
libs-posix: [sqlite3, pq],
libs-windows: [sqlite3, libpq],
copyFiles-windows-x86: [ libs/win32/sqlite3.dll, 
libs/win32/libpq.dll, libs/win32/intl.dll ],
sourceFiles-windows-x86 : [ 
libs/win32/sqlite3.lib, libs/win32/libpq.lib ]

},
{
name: MySQL,
versions: [USE_MYSQL]
},
{
name: SQLite,
versions: [USE_SQLITE],
libs-posix: [sqlite3],
libs-windows: [sqlite3],
copyFiles-windows-x86: [ libs/win32/sqlite3.dll ],
sourceFiles-windows-x86 : [ 
libs/win32/sqlite3.lib ]

},
{
name: PGSQL,
versions: [USE_PGSQL],
libs-posix: [pq],
libs-windows: [libpq],
copyFiles-windows-x86: [ libs/win32/libpq.dll, 
libs/win32/intl.dll ],

sourceFiles-windows-x86 : [ libs/win32/libpq.lib ]
}
]

Re: Learning to XML with D

[Arjan via Digitalmars-d-learn]

On Friday, 6 February 2015 at 09:15:54 UTC, Derix wrote:
So, I set sails to transform a bunch of HTML files with D. 
This, of course, will happen with the std.xml library.


There is this nice example :
http://dlang.org/phobos/std_xml.html#.DocumentParser
that I put to some use already, however some of the basics seem 
to escape me, specially in lines like


xml.onEndTag[author]   = (in Element e) { book.author
   = e.text(); };

OK, we're doing some event-base parsing, reacting with a lambda 
function on encountering so-and-do tag, à la SAX. (are we ?)


What I don't quite grab is the construct (in Element e) , 
especially the *in* part.


Is it *in* as in http://dlang.org/expression.html#InExpression 
? In which case I fail to see what associative array we're 
considering.


It's probably more a way to further qualify the argument e were 
passing to the  λ-function : could someone elaborate on that ?


Of course, it is entirely possible that I completely miss the 
point and that I'm overlooking some fundamentals, if so have 
mercy and help me find my way back to teh righteous path ;-)



Thxxx


Maybe, when you're on windows, you could use msxml6 through COM.
You have DOM, SAX, Xpath 1.0 and XSLT at your disposal.

Re: Why hibernated does not create tables automatically?

[Arjan via Digitalmars-d-learn]

On Friday, 6 February 2015 at 09:42:09 UTC, zhmt wrote:

class Card
{
import hibernated.core;

@Id
@Generated
long id;
@UniqueKey
string pwd;
}

MySQLDriver driver = new MySQLDriver();
	string url = MySQLDriver.generateUrl(10.211.55.10, 3306, 
test);
	string[string] params = MySQLDriver.setUserAndPassword(root, 
xxx);
	auto ds = new ConnectionPoolDataSourceImpl(driver, url, 
params);


EntityMetaData schema = new SchemaInfoImpl!(Card);
Dialect dialect = new MySQLDialect();
auto factory = new SessionFactoryImpl(schema, dialect, ds);


Card c = new Card;
auto s = factory.openSession();
scope(exit) s.close();
s.save(c);


Here is the simplest example, but it complains the same error.

OK,
Before the call
auto s = factory.openSession();
Does de mysql db has a db called 'test' and a table called 'card' 
with columns named 'id' and 'pwd'? If not call:

factory.getDBMetaData().updateDBSchema( conn, true, true );
verify the table is created in mysql.
After create call:
factory.openSession();
...
If things are still failing take a look here:
https://github.com/buggins/hibernated/blob/master/hdtest/source/htestmain.d
This is a simple program testing some basic functions of 
hibernated. Try it with sqlite first after that add a mysql 
section and try again.

Re: Why hibernated does not create tables automatically?

[Arjan via Digitalmars-d-learn]

On Friday, 6 February 2015 at 08:53:12 UTC, zhmt wrote:
The app compiles fine, but It throw an exception when I try to 
save data to mysql :


hibernated.type.MappingException@../../../zhmt/.dub/packages/hibernated-0.2.19/source/hibernated/metadata.d(3332): 
Cannot find entity by class ezsockacount.Dao.Customer


My initialization code is something like:

MySQLDriver driver = new MySQLDriver();
		string url = MySQLDriver.generateUrl(10.211.55.10, 3306, 
test);
		string[string] params = 
MySQLDriver.setUserAndPassword(root, xxx);

ds = new ConnectionPoolDataSourceImpl(driver, url, params);

		EntityMetaData schema = new 
SchemaInfoImpl!(Customer,Card,Agent);

Dialect dialect = new MySQLDialect();
factory = new SessionFactoryImpl(schema, dialect, ds);

Connection conn = ds.getConnection();
scope(exit) conn.close();

DBInfo db = factory.getDBMetaData();
db.updateDBSchema(conn, false, true);



I checked the static EntityInfo [] entities; in 
SchemaInfoImpl,

the length of entites is 0.

And tables in mysql is not created automatically either.

I found the point of this question, but dont know how to 
resolve it?


Will anybody help me?

Thx ahead!!


IFAIK partial creation does not work. (bug?)
Use db.updateDBSchema( conn, true, true) make sure none of the 
entities exist in the database. Otherwise it will fail.


hth.

Re: Problem interfacing with GSL

[Arjan via Digitalmars-d-learn]

On Sunday, 30 November 2014 at 16:26:53 UTC, Joseph Rushton 
Wakeling via Digitalmars-d-learn wrote:

On 30/11/14 13:21, Arjan via Digitalmars-d-learn wrote:

Hi!
D noob here.
I'm trying to call this function from the GSL lib:


Out of curiosity (since your question has already been 
answered), what functionality is it that is making you want to 
use GSL?  I ask because I want to be sure we're not missing 
something we ought to have in Phobos.


I'm taking a course in statistical inference and uncertainty, 
since I'm learning D, i thought I'd do some numerical computing 
in it.

Does there exist a library so I can stick in D only?

Problem interfacing with GSL

[Arjan via Digitalmars-d-learn]

Hi!
D noob here.
I'm trying to call this function from the GSL lib:

double gsl_stats_long_double_mean (const long double [], const 
size_t, const size_t);


linking with: -L-lgsl -L-lgslcblas -L-lm

I have tried different configurations, refering to
http://dlang.org/interfaceToC.html and the forums, but it always 
gives me probems like,

calling it the wrong way or segmentation falt.
Can anyone help?

Arjan

Re: Problem interfacing with GSL

[Arjan via Digitalmars-d-learn]

On Sunday, 30 November 2014 at 13:09:15 UTC, John Colvin wrote:

On Sunday, 30 November 2014 at 12:21:51 UTC, Arjan wrote:

Hi!
D noob here.
I'm trying to call this function from the GSL lib:

double gsl_stats_long_double_mean (const long double [], const 
size_t, const size_t);


linking with: -L-lgsl -L-lgslcblas -L-lm

I have tried different configurations, refering to
http://dlang.org/interfaceToC.html and the forums, but it 
always gives me probems like,

calling it the wrong way or segmentation falt.
Can anyone help?

Arjan


the correct signature in D for that would be:

import core.std.config;

double gsl_stats_long_double_mean(const(c_long_double)*, const 
size_t, const size_t);


I admit i was far from getting it right :), and was unaware of 
core.std.config functionalities.

Thanks!
Arjan.

Re: Example of the perils of binding rvalues to const ref

[Arjan via Digitalmars-d]

On Tuesday, 16 September 2014 at 15:30:49 UTC, Andrei 
Alexandrescu wrote:

http://www.slideshare.net/yandex/rust-c

C++ code:

std::string get_url() {
return http://yandex.ru;;
}

string_view get_scheme_from_url(string_view url) {
unsigned colon = url.find(':');
return url.substr(0, colon);
}

int main() {
auto scheme = get_scheme_from_url(get_url());
std::cout  scheme  \n;
return 0;
}

string_view has an implicit constructor from const string (see 
basic_string_view(const basic_stringcharT, traits, 
Allocator str) noexcept; in 
https://isocpp.org/files/papers/N3762.html). The function 
get_url() returns an rvalue, which in turn gets bound to a


Forgive me my ignorance but  get_url() returns a std::string (on 
the stack), so its address can be token.
And iirc the explainer Scott Meyers explained once iff you can 
take its address its not a rvalue its a lvalue. So isn't the 
get_scheme_from_url() not simply holding a const ref to 
temporary? (which most compiler warn about)


...Or am I missing the point?

reference to const and implicitly passed to string_view's 
constructor. The obtained view refers to a dead string.



Andrei

Re: D Users Survey: Primary OS?

[Arjan via Digitalmars-d]

On Thursday, 29 May 2014 at 18:24:57 UTC, Tom Browder via 
Digitalmars-d wrote:

Has anyone done a survey of the primary OS of D users?

I (a D newbie) use Debian Linux (64-bit), but I get the feeling 
that

many (if not most) users are on some version of Windows.

Thanks.

Best regards,

-Tom


Windows-7, opensuse-12.3/thumbleweed, FreeBSD-9/10 32 and 64 bits.

Re: Video of my LDC talk @ FOSDEM'14

[Arjan via Digitalmars-d-announce]

Enjoy!


Besides the noise, I did!
Great talk!

And thanks for your efforts to make LDC a success.

Re: SQLite3

[Arjan via Digitalmars-d-learn]

On Thursday, 8 May 2014 at 10:29:16 UTC, Jack wrote:

On Wednesday, 7 May 2014 at 19:03:34 UTC, Arjan wrote:

On Wednesday, 7 May 2014 at 06:21:10 UTC, Jack wrote:

First off a Disclaimer: I'm a noob and still learning. Please
don't bash me like some forums.

Now to the questions: I'm searching for a quick and easy way 
to

integrate SQLite3 in my application.


maybe:
https://github.com/buggins/ddbc/wiki ?


I seem to have a problem with that library. Even if the modules 
have been imported and the libraries linked and yada yada, it 
spews error upon error. Sample code is this:


import std.stdio;
import ddbc.drivers.sqliteddbc;

void main(){

SQLITEDriver driver = new SQLITEDriver();
writeln(SUCCESS);
}


Error spewed out is this:
hello.d|7|Error: undefined identifier SQLITEDriver|

I think Code::Blocks is importing the modules but not detecting 
the modules. Been at it for a few hours now. Any help?


Did you specify the configuration to use to dub?
dub -c SQLite

Re: SQLite3

[Arjan via Digitalmars-d-learn]

On Thursday, 8 May 2014 at 11:48:14 UTC, Jack wrote:

On Thursday, 8 May 2014 at 11:07:06 UTC, Arjan wrote:

On Thursday, 8 May 2014 at 10:29:16 UTC, Jack wrote:

On Wednesday, 7 May 2014 at 19:03:34 UTC, Arjan wrote:

On Wednesday, 7 May 2014 at 06:21:10 UTC, Jack wrote:
First off a Disclaimer: I'm a noob and still learning. 
Please

don't bash me like some forums.

Now to the questions: I'm searching for a quick and easy 
way to

integrate SQLite3 in my application.


maybe:
https://github.com/buggins/ddbc/wiki ?


I seem to have a problem with that library. Even if the 
modules have been imported and the libraries linked and yada 
yada, it spews error upon error. Sample code is this:


import std.stdio;
import ddbc.drivers.sqliteddbc;

void main(){

SQLITEDriver driver = new SQLITEDriver();
writeln(SUCCESS);
}


Error spewed out is this:
hello.d|7|Error: undefined identifier SQLITEDriver|

I think Code::Blocks is importing the modules but not 
detecting the modules. Been at it for a few hours now. Any 
help?


Did you specify the configuration to use to dub?
dub -c SQLite


Yes. I've also linked the library to it.
Dub:
http://puu.sh/8DYrR.png
Code::Blocks Configuration:
http://puu.sh/8DYug.png


Ah ok. CodeBlocks does not integrate with dub.
Take a look in the dub.json file of ddbc and collect the 
'versions' for the SQLite configuration (USE_SQLITE)

Add those 'versions' to the DMD commandline n codeblocks:
dmd.exe  -version=USE_SQLITE -version=...

Re: DOSNEWSIZE Error

[Arjan via Digitalmars-d-learn]

On Thursday, 8 May 2014 at 14:49:09 UTC, Jack wrote:
I had a compiler error with just a DOSNEWSIZE Error with no 
more information.


Code: http://pastebin.com/UDAgmjtx

I was trying to learn to implement SQLite connections to a 
local file with only the path to the file and no port or 
localhost nonesense from this :


https://github.com/buggins/ddbc/wiki

I tried a google search about the error but so far it landed me 
into a post with no replies, and various other non-D related 
posts.


Optlink error.
Are you builing a x86_32 exe or x86_64 exe?
when 32 bits use the dmd -m32 and make sure to use omf libs.
when 64 bits don not use optlink but MS VS link.exe and use coff 
libs.

Re: SQLite3

[Arjan via Digitalmars-d-learn]

On Wednesday, 7 May 2014 at 06:21:10 UTC, Jack wrote:

First off a Disclaimer: I'm a noob and still learning. Please
don't bash me like some forums.

Now to the questions: I'm searching for a quick and easy way to
integrate SQLite3 in my application.


maybe:
https://github.com/buggins/ddbc/wiki ?