Re: How to use eventcore write an echo server?
On Tuesday, 12 March 2024 at 05:13:26 UTC, zoujiaqing wrote:
How to fix it? than you ;)
Try the following:
```
class Connection
{
StreamSocketFD client;
ubyte[1024] buf = void;
// Add these two lines before the constructor:
nothrow:
@safe:
this(StreamSocketFD client)
```
Also you will need to either comment out calls to writeln() or
surround them in try/catch as writeln() may throw so it can't
really be called in nothrow code... For starters just comment all
calls to writeln() out to make it compile, and then move from
there.
Re: C to D: please help translate this weird macro
On Wednesday, 20 September 2023 at 13:55:14 UTC, Ki Rill wrote: On Wednesday, 20 September 2023 at 13:53:08 UTC, Ki Rill wrote: Here is the macro: ```C #define NK_CONTAINER_OF(ptr,type,member)\ (type*)((void*)((char*)(1 ? (ptr): &((type*)0)->member) - NK_OFFSETOF(type, member))) ``` I'm trying to translate the Nuklear GUI library to D [here](https://github.com/rillki/nuklear-d/tree/nuklear-d-translation). Here is how `NK_OFFSETOF` is defined: ```c #define NK_OFFSETOF(st,m) ((nk_ptr)&(((st*)0)->m)) ``` NK_OFFSETOF is the same as D's struct `.offsetof` attribute. NK_CONTAINER_OF should probably be translated to: `cast(T*)((cast(void*)ptr - __traits(getMember, T, member).offsetof))` PS. I did not invent this. My original idea was far worse than this. - It was suggested on IRC by a much cleverer D programmer than myself - Herringway@IRC
Re: C to D: please help translate this weird macro
On Wednesday, 20 September 2023 at 13:55:14 UTC, Ki Rill wrote: On Wednesday, 20 September 2023 at 13:53:08 UTC, Ki Rill wrote: Here is the macro: ```C #define NK_CONTAINER_OF(ptr,type,member)\ (type*)((void*)((char*)(1 ? (ptr): &((type*)0)->member) - NK_OFFSETOF(type, member))) ``` I'm trying to translate the Nuklear GUI library to D [here](https://github.com/rillki/nuklear-d/tree/nuklear-d-translation). Here is how `NK_OFFSETOF` is defined: ```c #define NK_OFFSETOF(st,m) ((nk_ptr)&(((st*)0)->m)) ``` Looks like you are not the only one who has issue with them: https://github.com/Immediate-Mode-UI/Nuklear/issues/94 https://github.com/Immediate-Mode-UI/Nuklear/pull/309
Re: Writing a simple text editor in D using a C tutorial
On Tuesday, 29 August 2023 at 16:17:56 UTC, Răzvan Birișan wrote: Is there a better way to use `termios.h` inside D? Am I missing the point and there is a way to set these flags in D without using C libraries? I would try to use termios from druntime instead. Try: import core.sys.posix.termios;
Re: wanting to try a GUI toolkit: needing some advice on which one to choose
On Thursday, 27 May 2021 at 01:17:44 UTC, someone wrote: Yes, I know this is a question lacking a straightforward answer. Requirements: [...] I humbly believe the most complete one is GtKD. https://gtkdcoding.com/ https://gtkd.org We all wish there was a STANDARD D GUI library out there, but that is a huge effort one or two individuals can't do by themselves (that is why all such efforts failed in the past)...
Re: dmd memory usage
On Monday, 18 November 2019 at 00:20:12 UTC, Steven Schveighoffer wrote: I'm fighting some out of memory problems using DMD and some super-template heavy code. I have ideas on how to improve the situation, but it involves redesigning a large portion of the design. I want to do it incrementally, but I need to see things improving. Is there a straightforward way to figure out how much memory the compiler uses during compilation? I though maybe /usr/bin/time, but I feel like I don't trust the output to be the true max resident size to be what I'm looking for (or that it's 100% accurate). Is there a sure-fire way to have DMD print it's footprint? -Steve You can wrap the whole thing in a shell script that takes PID of the compiler, and uses psrecord [1] Python tool to give you CPU and memory chart. [1] https://pypi.org/project/psrecord/
Re: SendMessageTimeoutW requires casting string to uint?
On Tuesday, 9 July 2019 at 10:34:54 UTC, BoQsc wrote: All I know that there was toString16z function from tango project, that made it all work. Now that I browsed the std.utf more, I realised what fits your need best is the https://dlang.org/phobos/std_utf.html#toUTF16z
Re: SendMessageTimeoutW requires casting string to uint?
On Tuesday, 9 July 2019 at 10:34:54 UTC, BoQsc wrote: I'm quite new to the programming, and I'm getting unsure how to make SendMessageTimeoutW to work with D lang. Most of my attention right now resides around the Argument of the SendMessageTimeoutW function: "Environment", It seems that SendMessageTimeoutW accepts only uint type, and string can't be directly used. I think that I have to convert string characters to "C-style 0 terminated string". And everything should work? But I'm unsure how to do that. All I know that there was toString16z function from tango project, that made it all work. std.utf module has all encoding/decoding you need (in this case UTF-16). I guess You need to convert your string using toUTF16 ( https://dlang.org/phobos/std_utf.html#toUTF16 ). I do not do Windows programming so I am not 100% sure whether this will work or not. Give it a try.
Re: SendMessageTimeoutW requires casting string to uint?
On Tuesday, 9 July 2019 at 11:06:54 UTC, Dejan Lekic wrote: std.utf module has all encoding/decoding you need (in this case UTF-16). I guess You need to convert your string using toUTF16 ( https://dlang.org/phobos/std_utf.html#toUTF16 ). I do not do Windows programming so I am not 100% sure whether this will work or not. Give it a try. Maybe even the straightforward to!wchar will work!?
Re: Singleton in Action?
On Saturday, 2 February 2019 at 16:56:45 UTC, Ron Tarrant wrote: Hi guys, I ran into another snag this morning while trying to implement a singleton. I found all kinds of examples of singleton definitions, but nothing about how to put them into practice. Can someone show me a code example for how one would actually use a singleton pattern in D? When I did the same thing in PHP, it took me forever to wrap my brain around it, so I'm hoping to get there a little faster this time. I strongly suggest you find the thread started by Andrej Mitrovic many years ago. He compared several implementations of (thread-safe) singletons. I it an extremely helpful stuff, IMHO.
Re: Optional parameters?
On Sunday, 1 April 2018 at 15:54:16 UTC, Steven Schveighoffer wrote: I currently have a situation where I want to have a function that accepts a parameter optionally. This is what function overloading and/or default values are for, right?
Re: ndslice summary please
On Thursday, 13 April 2017 at 10:00:43 UTC, 9il wrote: On Thursday, 13 April 2017 at 08:47:16 UTC, Ali Çehreli wrote: I haven't played with ndslice nor followed its deprecation discussions. Could someone summarize it for us please. Also, is it still used outside Phobos or is Ilya or someone else rewriting it? Ali The reasons to use mir-algorithm instead of std.range, std.algorithm, std.functional (when applicable): 1. It allows easily construct one and multidimensional random access ranges. You may compare `bitwise` implementation in mir-algorithm and Phobos. Mir's version few times smaller and do not have Phobos bugs like non mutable `front`. See also `bitpack`. 2. Mir devs are very cary about BetterC 3. Slice is universal, full featured, and multidimensional random access range. All RARs can be expressed through generic Slice struct. 4. It is faster to compile and generates less templates bloat. For example: slice.map!fun1.map!fun2 is the same as slice.map!(pipe!(fun1, fun2)) `map` and `pipe` are from mir-algorithm. It is all good, but I am sure many D programmers, myself included, would appreciate if shortcomings of Phobos are fixed instead of having a completely separate package with set of features that overlap... I understand ndslice was at some point in the `experimental` package, but again - it would be good if you improve existing Phobos stuff instead of providing a separate library that provides better implementation(s).
Re: Using Dub
On Monday, 16 January 2017 at 09:40:55 UTC, Russel Winder wrote: On the one hand Cargo works wonderfully with Rust so I had hoped Dub would work wonderfully with D. Sadly I am finding it doesn't. Possibly my fault, but still annoying. Cargo does not have multiple Rust compilers as an option. Dub could look to find for compiler if it is not set, but that may disappoint users who have multiple compilers installed (myself included)...
Re: [Semi-OT] I don't want to leave this language!
On Monday, 5 December 2016 at 20:25:00 UTC, Ilya Yaroshenko wrote: Good D code should be nothrow, @nogc, and betterC. BetterC means that it must not require DRuntime to link and to start. I started Mir as scientific/numeric project, but it is going to be a replacement for Phobos to use D instead/with of C/C++. Yes, perhaps it is so in your world... In my world I have absolutely no need for this. In fact we are perfectly happy with Java runtime which is many times bigger than druntime!
Re: Build a SysTime from a string
On Wednesday, 6 July 2016 at 14:15:22 UTC, Andrea Fontana wrote: My problem is that from documentation I can't understand how to set +01:00 timezone on systime. I guess I'm missing something... As far as I know, you can't do that. Quote from the documentation: """ Unlike DateTime, the time zone is an integral part of SysTime (though for local time applications, time zones can """ It does make sense, right? SysTime is object representing your system's time, and naturally it already has timezone set to the right (system) value.
Re: What's the secret to static class members
On Thursday, 30 June 2016 at 01:11:09 UTC, Mike Parker wrote: I think it's safe to say this guy is just trolling and we can ignore him. I was about to say the same, Mike. He is either trolling, or genuinely did not even bother to learn some language basics...
Re: improve concurrent queue
On Tuesday, 27 August 2013 at 17:35:13 UTC, qznc wrote: I can recommand this paper (paywalled though): http://dl.acm.org/citation.cfm?id=248106 The research paper can actually be freely downloaded from http://www.dtic.mil/cgi-bin/GetTRDoc?AD=ADA309412 . Good article, thanks!
Re: print function
On Thursday, 4 February 2016 at 00:23:07 UTC, ixid wrote: It would be nice to have a simple writeln that adds spaces automatically like Python's 'print' in std.stdio, perhaps called print. There are many implementations of string interpolation in D (that is what you want, basically). One of them is given in Phillipe's excellent book about templates: https://github.com/PhilippeSigaud/D-templates-tutorial/blob/master/D-templates-tutorial.md#simple-string-interpolation .
Re: Setting native OS thread name (eg, via prctl)
Arun, isn't that what the 'name' property is there for?
Re: __traits(allMembers) and aliases
It is off-topic (sorry for that), but how you grab only those (say functions) in a module that are annotated with @ChoseMe ?? allMembers trait gives bunch of strings, and I could not find a way to use them with hasUDA template...
Re: New to D - playing with Thread and false Sharing
Keep in mind that in D everything is thread-local by default! :) For shared resources use __gshared or shared (although I do not know for sure whether shared works or not).
Re: How to use Fiber?
On Tuesday, 24 February 2015 at 10:15:29 UTC, FrankLike wrote:
There is a int[] ,how to use the Fiber execute it ?
Such as :
import std.stdio;
import core.thread;
class DerivedFiber : Fiber
{
this()
{
super( run );
}
private :
void run()
{
printf( Derived fiber running.\n );
faa();
}
}
int[] v;
void ftread()
{
DerivedFiber work = new DerivedFiber();
writeln( will call );
work.call();
writeln( stop call );
}
void faa()
{
writeln( start );
//Fiber.yield();
writeln( start yield );
foreach(c;v)
{
writeln( current n is ,c );
}
}
void main()
{
int n=1;
while(n=10_001)
{
v~=n;
n+=5000;
}
printf( Execution returned to calling context.\n );
ftread();
}
-end
I dont's think it's a good work.
How about you?
Thank you.
On the Articles page on D Wiki ( http://wiki.dlang.org/Articles
) you have this link:
http://octarineparrot.com/article/view/getting-more-fiber-in-your-diet
It is probably the best article about using fibers in D that I
have seen so far.
Re: Beginner ?. Why does D suggest to learn java
On Thursday, 16 October 2014 at 22:26:51 UTC, RBfromME wrote: I'm a newbie to programming and have been looking into the D lang as a general purposing language to learn, yet the D overview indicates that java would be a better language to learn for your first programming language. Why? Looks like D is easier than Java... D is far more complex programming language than Java. I do D programming for over decade, and Java for ~9 years (before I was a C++ programmmer). Just take a look at number of types you have in D, storage classes, pointers, modules (that will soon come to Java too), etc... D generics are superior to Java. However, Java generics are superasy. Java is designed to be an easy programming language, D is designed to be pragmatic. If people new to programming were about to start with D as the first language, I suggest them to start with an easy subset of it, and I humbly believe that subset will look very, very similar to Java. PS. this is not Java advocacy here, I am just trying to be fair and realistic. I just love D but if I said D is as easy as Java, that would be a lie.
Re: Allowing Expressions such as (low value high)
On Thursday, 4 September 2014 at 20:03:57 UTC, Nordlöw wrote:
Are there any programming languages that extend the behaviour
of comparison operators to allow expressions such as
if (low value high)
?
This syntax is currently disallowed by DMD.
I'm aware of the risk of a programmer misinterpreting this as
if ((low value) high)
It is not just that... Imagine this (nothing prevents you from
doing it):
if (foo bar baz trt mrt frt /* etc */) {}
Re: ini library in OSX
On Monday, 8 September 2014 at 06:32:52 UTC, Joel wrote: Is there any ini library that works in OSX? I've tried the ones I found. I think they have the same issue. Joels-MacBook-Pro:ChrisMill joelcnz$ dmd ini -unittest ini.d(330): Error: cannot pass dynamic arrays to extern(C) vararg functions ini.d(387): Error: undefined identifier 'replace', did you mean 'template replace(E, R1, R2)(E[] subject, R1 from, R2 to) if (isDynamicArray!(E[]) isForwardRange!R1 isForwardRange!R2 (hasLength!R2 || isSomeString!R2))'? ini.d(495): Error: cannot pass dynamic arrays to extern(C) vararg functions ini.d(571): Error: cannot pass dynamic arrays to extern(C) vararg functions ini.d(571): Error: cannot pass dynamic arrays to extern(C) vararg functions Joels-MacBook-Pro:ChrisMill joelcnz$ You have a pretty functional INI parser here: http://forum.dlang.org/thread/1329910543.20062.9.camel@jonathan
Re: ini library in OSX
Or this one: http://dpaste.dzfl.pl/1b29ef20#
Re: Installing LDC on Windows
On Saturday, 6 September 2014 at 11:13:20 UTC, Russel Winder via Digitalmars-d-learn wrote: OK I installed LDC pre-built on MinGW for Windows on Windows and then Installed MinGW for Windows but when I run ldc2 it tells me libgcc_s_dw2-1.dll is missing. Is this problem soluble by any means other than destruction of Windows? My first guess is that you do not use 32bit MinGW. Here is what I got inside MSYS2 (MSYS2 rocks btw!): $ find . -name libgcc* ./mingw32/bin/libgcc_s_dw2-1.dll ./mingw64/bin/libgcc_s_seh-1.dll
Re: dmd with shared lib
bioinfornatics wrote: Hi, after building and installing dmd i fail to use generated executable because they are an undefined symbol. $ /opt/dmd/bin/dmd -L-lcurl testDelegate.d $ ./testDelegate ./testDelegate: symbol lookup error: /opt/dmd/lib/libphobos2.so.0.66: undefined symbol: curl_version_info $ ldd ./testDelegate linux-vdso.so.1 = (0x7fff2d4e8000) libcurl.so.4 = /opt/dmd/lib/libcurl.so.4 (0x7f82fd06) libdl.so.2 = /lib64/libdl.so.2 (0x7f82fce58000) libphobos2.so.0.66 = /opt/dmd/lib/libphobos2.so.0.66 (0x7f82fc81) libpthread.so.0 = /lib64/libpthread.so.0 (0x7f82fc5f) libm.so.6 = /lib64/libm.so.6 (0x7f82fc2e8000) librt.so.1 = /lib64/librt.so.1 (0x7f82fc0e) libc.so.6 = /lib64/libc.so.6 (0x7f82fbd2) /lib64/ld-linux-x86-64.so.2 (0x7f82fd288000) given executable is link with libcurl provided by dmd when i look into these curl lib they are any curl_version_info symbol # readelf -Ws /opt/dmd/lib/libcurl.so.4 | grep curl_version_info # readelf -Ws /opt/dmd/lib/libcurl_stub.so | grep curl_version_info while this symbol exist on libcurl provided by my fedora # readelf -Ws /usr/lib64/libcurl.so.4| grep curl_version_info 346: 00023f20 140 FUNCGLOBAL DEFAULT 11 curl_version_info You are probably using DMD provided @ dlang.org... That one has issues (curl) on Fedora. DMD built with my SPEC from https://www.gitorious.org/dejan-fedora/dejan-fedora does not have these problems as far as I know. -- http://dejan.lekic.org
Re: DFL is the best UIcontrols for D,compare it to dwt, tkd,dtk,dlangui,anchovy......
Although DFL not use on Linux or Mac os X,it's easy to do for high level Software Engineer. Well, go ahead and do it!
Re: Any chance to avoid monitor field in my class?
On Tuesday, 13 May 2014 at 17:41:42 UTC, Yuriy wrote:
On Tuesday, 13 May 2014 at 17:09:01 UTC, Daniel Murphy wrote:
What exactly is the mangling problem with extern(C++) classes?
Can't use D arrays (and strings) as function argument types.
Can't use D array types as template arguments.
extern (C++) MyClass(T)
{
}
MyClass!string a; // Mangling error
that should not compile at all. Perhaps you thought extern(C++)
interface MyClass(T) ?
Re: A lot of people want to use D,but they only know MS SQL Server,what will help them to Learn D?
On Monday, 14 April 2014 at 15:21:33 UTC, FrankLike wrote: Hello,everyone: A lot of people want to use D,but they only know MS SQL Server,what will help them to Learn D? So lots of people want to use D,who can help them? They want to connect MS SQL Server in D,then they will connect other DataBase, because it's a good idea that nice thing come from the small and familiar things always. Sql driver or ODBC driver, for win7 in D, who can help them? Thank you,everyone. First thing a D programmer MUST do is 1) To port FreeTDS to D, or write a binding/wrapper for it (should not be too difficult). or 2) Use ODBC directly, or maybe also write some wrapper around it. or 3) Implement D connector to MS SQL server directly (I would advise against that, such project would probably be 10x bigger than the DMD project itself) My advice - use ODBC, it is the fastest way you may connect to the SQL server, and you already have everything you need for that. :) Regards
Re: D project structure
On Wednesday, 26 March 2014 at 16:13:15 UTC, Russel Winder wrote: Is it the case that the Dub recommended project structure is in fact the canonical D project structure? The Dub recommended structure doesn't mention test code as opposed to application/library source code, is it the case that the assumption is that all tests are in the modules using built-in unittest and that there are never any external tests? What about integration and system testing? cf. The canonical jvm language project structure is src/main/language src/test/language src/integtest/language Thanks. I use precisely the same structure as my Maven projects. It does make sense to me, as some of the projects I worked on mix languages (D with C, C++ and/or Java).
Re: Template mixins - why only declarations
Template mixins can't contain statements, only declarations, because they (template mixins) are a way to inject code into the context. Therefore it makes sense to forbid statements, as they can't appear in ANY context. -- http://dejan.lekic.org
Re: D alternative for C/C++ -Dfoo=42
On Tuesday, 25 February 2014 at 12:57:51 UTC, Dejan Lekic wrote:
On Tuesday, 25 February 2014 at 12:45:06 UTC, Cherry wrote:
Hello
I want to define an enum int, but I want to make it possible
to set its value when I run dmd from the command line. Is it
possible in D?
Regards
Cherry
D offers version blocks: http://dlang.org/version.html#version
It would be great if D compiler had a way to substitute enums
with given values. (This is a nice candidate for a DIP)
Imagine you have a code like this:
module myproggy;
import std.stdio;
enum foo = 5;
enum bar = walter;
int main() {
writeln(bar);
return foo;
}
... and you call compiler like:
dmd myproggy.d -Dfoo=42 -Dbar=hello
smart, new D compiler would replace enums (iff they exist in
the source code) with the given arguments, so when you run
myproggy, you get walter as output, and the exit code is 42.
And yes, if someone builds multiple modules, he/she would have to
use fully-qualified name. Example: dmd foo.d bar.d -Dfoo.var1=5
-Dbar.var4=walter
Re: D alternative for C/C++ -Dfoo=42
On Tuesday, 25 February 2014 at 12:45:06 UTC, Cherry wrote:
Hello
I want to define an enum int, but I want to make it possible to
set its value when I run dmd from the command line. Is it
possible in D?
Regards
Cherry
D offers version blocks: http://dlang.org/version.html#version
It would be great if D compiler had a way to substitute enums
with given values. (This is a nice candidate for a DIP)
Imagine you have a code like this:
module myproggy;
import std.stdio;
enum foo = 5;
enum bar = walter;
int main() {
writeln(bar);
return foo;
}
... and you call compiler like:
dmd myproggy.d -Dfoo=42 -Dbar=hello
smart, new D compiler would replace enums (iff they exist in the
source code) with the given arguments, so when you run myproggy,
you get walter as output, and the exit code is 42.
Re: D alternative for C/C++ -Dfoo=42
On Tuesday, 25 February 2014 at 13:21:38 UTC, bearophile wrote: Dejan Lekic: And yes, if someone builds multiple modules, he/she would have to use fully-qualified name. Example: dmd foo.d bar.d -Dfoo.var1=5 -Dbar.var4=walter If you are interested in such things I suggest you to take a look at how the Fortress language does them. Bye, bearophile No, I am not interested, but thanks. I am interested how D does them, or better say how it may do them...
Re: D alternative for C/C++ -Dfoo=42
I don't like it. I would prefer a CTFE-able counter part to boost::program_options that generates thouse enums from a config file. If you want a config file, you do not need -D args. You simply import() it. Right?
Re: What does q{...} mean?
Gary Willoughby wrote:
I keep seeing this syntax used a bit and i'm stumped to what it
means. What is it?
enum foo = q{
// ???
};
q{} string literals (so-called token strings) are a nice D feature - D
garantees that tokens in between brackets are valid D tokens. This makes
them perfect for storing D source code. They are quite useful for string
mixins for an example.
--
http://dejan.lekic.org
Re: Timer
On Monday, 17 February 2014 at 11:08:16 UTC, Chris wrote:
The D way of implementing a timer? I need to (automatically)
execute a function that performs a clean up, say every hour.
if (file.older than 1 hour) {
remove;
}
Here is a quick timer implementation that you can improve
yourself:
import std.stdio;
import core.thread;
class ChrisTimer : Thread {
private void delegate() funcToRun;
private long timeToWait;
private bool done = false;
private int noSheep;
private Duration howLong;
// We could make any function a parameter to ChrisTimer if we
had a
// constructor like:
// this(void delegate() dg, long ms) {
this(long ms) {
funcToRun = doSomething;
timeToWait = ms;
howLong = dur!(msecs)(timeToWait);
funcToRun = doSomething;
super(run);
}
private void run() {
while (isRunning !done) {
funcToRun();
sleep(howLong);
}
}
// Example function that is just going to count sheep (up to
10).
public void doSomething() {
++noSheep;
writeln(Counted , noSheep, sheep.);
if (noSheep = 10) {
done = true;
}
}
} // ChrisThread class
int main(string[] args) {
auto ct = new ChrisTimer(2000);
ct.start();
return 0;
}
Re: fibers/coroutines tutorial?
On Friday, 24 January 2014 at 16:02:27 UTC, Hasan wrote: Is there a quick tutorial/intro for what D offers as an equivalent or alternative to goroutines? I've seen the concurrency link on the homepage .. and umm .. call me lazy but I don't feel like reading through all that just to see what D's alternative to goroutines looks like .. Yes, and it is listed on http://wiki.dlang.org . Please go to articles/tutorials part of that web-site and enjoy really good reads.
Re: What's the D way of application version numbers?
On Sunday, 12 January 2014 at 18:36:19 UTC, Russel Winder wrote: With C++ and Python, it is idiomatic to put the application version number in a separate file that can then be processed by the build system. For C++ a config file is constructed defining a macro that is then used in the rest of the course. For Python the file is read at runtime to define a variable. The build system itself uses the version number for creating deb, RPM, egg, wheel, etc. packages. D has no macro processing so C++ idioms are not useful. D does create a standalone executable and so the Python approach of reading the file at initialization time seems inappropriate. Is there a known D idiom for this? Thanks. I simply define version in my main module (module which contains the main() function). I am planning to submit a DIP about something that is related to this. - I think we really need a way to specify version of package, and maybe even version of a module (similar to how the new Java module system works - see project Jigsaw). D does not offer this. I humbly believe it should be part of the language as it could be used also for building versions of dynamic libraries. Anyway, back to the topic. Say my main() function is in the org.dlang.myapp module. If I want to have information about version of the artifact, my myapp.d starts with the following two lines of D code: module org.dlang.myapp; version = 1_3_21_4; // major_minor_micro_qualifier Naturally, build tool looks for the version line when I need it.
Re: std.xml
On Friday, 10 January 2014 at 00:02:14 UTC, Ola Fosheim Grøstad wrote: The std.xml documentation states This module is considered out-dated and not up to Phobos' current standards. Does this mean that there is some other module I should use for xml parsing? Maybe one that is not in the standard distribution yet because it is beta? I'd like to convert a xml-based tool I have written in another language to D as an experiment, but I'd like to use libraries that are likely to stay up to date. Bascally it entails: - reading a xml file - build a dom for it - optimize it - write it back to another xml file What options do I have in terms of actively maintained libraries that are suitable for this kind of utility? Beta quality is ok. Here is one of the alternatives: https://github.com/opticron/kxml/blob/master/source/kxml/xml.d
Re: Learning D as main systems programming language
On Friday, 10 January 2014 at 00:05:35 UTC, Goran Petrevski wrote: You might want to look into XOmB: https://github.com/xomboverlord/xomb Isn't it written in D1? Not sure about that... So what if it is written in D1? :) It should not be a big problem to port it to D2. Second interesting project that is kinda related to the topic: https://bitbucket.org/timosi/minlibd . More: http://wiki.dlang.org/Other_Dev_Tools
Re: Are modules analogous to namespaces in C# or packages in Java?
On Wednesday, 1 January 2014 at 17:43:54 UTC, Afshin wrote: Modules confuse me as a way to organize code. If a module is composed of multiple classes, it seems that the module semantics in D encourages putting all those classes in one file. Can someone explain how to organize a set of classes into a module (or namespace, or package) so that each class can have their own file? Java is not (yet) truly modular programming language. Java 8 is supposed to include Jigsaw (module system for Java). More about it: http://openjdk.java.net/projects/jigsaw/ Packages in D are similar to packages in Java. Concept of modules as I wrote above, does not yet exist in Java.
Re: My first D module - Critiques welcome.
You could also do some neat stuff with opDispatch. Someone actually wrote an article about using it with roman numerals: http://idorobots.org/2012/03/04/romans-rubies-and-the-d/ The idea is actually brilliant. :) I think I may use it in the future when I need to deal with roman numbers. -- Dejan Lekic dejan.lekic (a) gmail.com http://dejan.lekic.org
Re: stdout - autoflushing
Benji wrote: Hello, in order to have correctly displayed output (before reading something from stdin), I must call stdout.flush(). Sometimes, it's really annoying, especially when it is necessarry to call it 10 times. For example: write(Enter some string: ); stdout.flush(); string a = readln(); write(And again please: ); stdout.flush(); string b = readln(); ... Is there any way to prevent this? I doubt. Your IDE is buffering application's streams. -- Dejan Lekic dejan.lekic (a) gmail.com http://dejan.lekic.org
Re: How to install dmd2 in centos 5.3 x64
On Tuesday, 3 December 2013 at 10:43:06 UTC, Puming wrote: Hi: I followed the steps in http://dlang.org/dmd-linux.html, but when I build a simple hello world program with: rdmd hello.d I get the following error: rdmd hello.d /usr/bin/ld: cannot find -l:libphobos2.a I have copied dmd2/linux/lib64/libphobos2.a to /usr/lib64, but ld still can't find it. Now I really wish all our servers are using ubuntu server.. Could anybody shed some light on where the problem is? I don't have much experience in linux except using apt-get in ubuntu. Thanks. Puming. What architecture that CentOS box is, and give us your /etc/dmd.conf please.
Re: undefined reference to `_D16TypeInfo_HAyayAa6__initZ'
On Saturday, 23 November 2013 at 23:47:11 UTC, Adam D. Ruppe wrote: On Saturday, 23 November 2013 at 23:30:09 UTC, Jeroen Bollen wrote: I added the code to my GitHub repo; there don't seem to be any uncommon associative arrays: Yea, it is the immutable string[string], I used the same pattern in my cgi.d and saw that too (sometimes, like I said, it is randomly there or not. it seems to be the outer immutable that triggers the problem. BTW, my cgi.d has fastcgi support too https://github.com/adamdruppe/misc-stuff-including-D-programming-language-web-stuff/blob/master/cgi.d compile with -version=fastcgi. It uses the C libfcgi in that mode. Feel free to copy any of my code you want if it is helpful to you. Adam, does it support multiplexing? Looks like people do not care much about that FastCGI feature... :(
Re: Composing features at compile time
Jacob Carlborg wrote:
Does anyone know a good way of composing features at compile time? Say I
have a struct or class that I want to support different features that
are configurable at compile time. One way would be to just pass in a
couple of boolean flags and use static-if, like this:
class Foo (bool logging, bool events)
{
static if (logging)
Logger logger;
this ()
{
static if (logging)
logger = new Logger;
}
void action ()
{
static if (logging)
logger.info(performing action);
// perform action
}
}
Using this approach I get the feeling that there will quickly become a
big nest of static-ifs. Does anyone have any better ideas?
Jakob, whenever I need something like you describe, I do more/less the same
what
is described on this Wikipedia page:
http://en.wikipedia.org/wiki/Composition_over_inheritance . C# example is
exactly how I do this (in Java and D).
--
Dejan Lekic
dejan.lekic (a) gmail.com
http://dejan.lekic.org
Re: T[] (array of generic type)
On Mon, 18 Nov 2013 21:32:11 +0100, Philippe Sigaud wrote: On Mon, Nov 18, 2013 at 9:20 PM, seany se...@uni-bonn.de wrote: I read that book, but dont find this constructtion, that is why the question. IIRC I talk a bit about function templates in my tutorial. JR gave the link (thanks!), another, more direct way is to directly download the pdf: https://github.com/PhilippeSigaud/D-templates-tutorial/blob/master/D- templates-tutorial.pdf (click on `view raw` to download) Try p. 28 and following. And I really should take the time to write this thing again... Philippe, i wonder whether you plan on generating ePUB file out of those TeX files? :)
Re: std.concurrency : sending immutable classes
When I run this program, I get a runtime error which gives me a headache: http://codepad.org/vKJl11cO
Re: std.concurrency : sending immutable classes
Could it be something changed in DMD recently, as in my case (DMD64 D Compiler v2.063.2, on Fedora GNU/Linux) it obviously picks Variant. Why it does not pick the immutable instance of A is beyond me. If we reverse the order of arguments in the receive(), we will get the function with arguments (VariantN!(32LU)) occludes successive function error...
Re: std.concurrency : sending immutable classes
On Tue, 12 Nov 2013 00:37:30 +0100, Dicebot wrote:
Minimized repro:
import std.variant;
class A {}
void main()
{
Variant v = new immutable A();
auto x = v.get!(immutable A)(); // triggers assert
}
One simple question - did this ever work? :) Because passing immutable
aggregate messages is sometimes sold as one of proper
usage scenario of std.concurrency and if it was never actually
implemented, that is damn sad. I have started to investigate this
scenario because of question on topic in #d @ freenode.
Looks like Variant works only with implicitly convertible types.
In this case this fails:
assert(isImplicitlyConvertible!(immutable(A), A));
Re: Embed JavaScript into D
On Mon, 04 Nov 2013 20:35:53 +0100, Jeroen Bollen wrote: Is there a way I can embed javascript into my D application? I basically want to create a modular application which allows adding and removing plugins by dragging and dropping them into a folder. I love the idea of them being editable on the fly. Check out this presentation: http://dconf.org/2013/talks/ chevalier_boisvert.html Source code: https://github.com/maximecb/Higgs Also, there is the DMScript project at DSource: http://dsource.org/ projects/dmdscript-2/
Re: fedora libcurl-gnutls issue
On Friday, 27 September 2013 at 16:41:42 UTC, Joshua Niehus wrote: 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 Option 1: Rebuild curl RPM with GnuTLS enabled. Option 2: Build Fedora DMD RPM on a Fedora box. Do not use the one from the web-site...
Re: Communication between Java and D application
On Fri, 13 Sep 2013 22:04:24 +0200, Anton Alexeev wrote: I have a method in a D program which I want to call from a Java program. What is the best way to do this? What you need is Java JNI: http://en.wikipedia.org/wiki/ Java_Native_Interface . There are many examples how to do this in C or C+ +. It should not be any different in D.
Re: [OT] Job postings
On Fri, 13 Sep 2013 15:20:47 +0200, Joseph Rushton Wakeling wrote: Hello all, OT question -- is there an etiquette/standard accepted practice for posting news of job openings to the D community? I wouldn't normally do this, but in this case it's on behalf of friends for whom I have a very great deal of respect and who I think would be very exciting to work for. Sad to say they're not D-related positions (I keep lobbying them, though:-) but I imagine there are people in this community who would make an excellent fit for the company in question. Anyway, let me know what the accepted form is (even if it's Don't do it!). Thanks best wishes, -- Joe There is a DDN - D Developer Network on LinkedIn . Link to it is listed on http://wiki.dlang.org.
Re: Module to work with environment variables
On Sat, 14 Sep 2013 19:23:31 +0200, FreeSlave wrote: As I remember there was module to work with environment variables in standard library. But now I can't find it. Was it removed or merged with some other module? Another question: I see some of modules are considered out-dated and not up to Phobos' current standards. Can I make attempt to rewrite them so new versions will be included in standard library? But what are Phobos' current standards? Are they described somewhere? It took few seconds to go to http://dlang.org, library reference, type env in the search box, and press enter. One of the first links you get is: http://dlang.org/phobos/std_process.html
Re: enum and tuples
On Friday, 9 August 2013 at 21:24:30 UTC, Ali Çehreli wrote: On 08/09/2013 12:41 PM, captaindet wrote: On 2013-08-09 11:36, Ali Çehreli wrote: as I am in the process of revising and translating a Tuples chapter. as a matter of fact, i am checking your website regularly, eagerly awaiting the translations of the tuples chapter. and the __traits and the template chapter too ;) I am very happy to hear that. It also makes me sad because I have been very slow this summer. :-/ In fact, I was in the middle of translating the More Templates chapter that I realized I should move tuples before that one. I further realized that TypeTuple deserves more information than a couple of paragraphs and a trivial use in a unittest. ;) And that's when I realized that TypeTuple is a very strange beast indeed. Ali I could not agree more. TypeTuple is IMHO one of the coolest features that is so underrated! Btw, Ali, everybody loves your book anyway. I recommend the section about Ranges to everyone. :D Keep up with the good work!
Re: D is totally useless
Temtaime wrote: I had investigate a little more in it. Thanks to Jack Applegame, we made a copy of gl/gl.h and opengl32.lib for DMD. http://acomirei.ru/u/gl.d http://acomirei.ru/u/opengl32.lib I hope it will be included in DMD, now it's first draft of our work. Why on the Earth would you include opengl32 in the DMD package?? -- Dejan Lekic dejan.lekic (a) gmail.com http://dejan.lekic.org
Re: How to read fastly files ( I/O operation)
FG wrote:
On 2013-02-04 15:04, bioinfornatics wrote:
I am looking to parse efficiently huge file but i think D lacking for this
purpose. To parse 12 Go i need 11 minutes wheras fastxtoolkit (written in c++
) need 2 min.
My code is maybe not easy as is not easy to parse a fastq file and is more
harder when using memory mapped file.
Why are you using mmap? Don't you just go through the file sequentially?
In that case it should be faster to read in chunks:
foreach (ubyte[] buffer; file.byChunk(chunkSize)) { ... }
I would go even further, and organise the file so N Data objects fit one page,
and read the file page by page. The page-size can easily be obtained from the
system. IMHO that would beat this fastxtoolkit. :)
--
Dejan Lekic
dejan.lekic (a) gmail.com
http://dejan.lekic.org
Re: Is there a portable way to limit memory/cpu usage of a D application?
On Thursday, 29 November 2012 at 04:44:34 UTC, Mike Young wrote: On Wednesday, 9 November 2011 at 17:13:14 UTC, Dejan Lekic wrote: Sure nothing prevents me from using setrlimit() in my D app, but perhaps it is something to think about a portable way of doing that. I know I'm over a year late coming in on this conversation, but how would you use setrlimit() in your D app at all? I can't seem to figure out what the correct library is to include in my program to be able to call set/getrlimit in any manner. Thanks! Well, if it is not in the posix module, then you simply use it by declaring extern(C) int setrlimit(int resource, const void* rlim); or something similar if you define the rlimit struct somewhere. Remember, you can call C functions from your D code anytime, anywhere.
Re: Using MinGW DLL with DMD?
On Thursday, 9 August 2012 at 13:43:18 UTC, Jacob Carlborg wrote: Is it possible to link a DLL compiled for MinGW with DMD? Yes, it is possible. Long ago i have dealt with this almost on a daily basis (we used Borland C++ Builder on Windows in the former company I worked for). The easiest method is to use DEF files to create the import library. If you do not have it, you can use some tool that will analyse the DLL, make the DEF file for you, and then you modify it to your needs, and then create the import library for your target toolchain. This article explains everything you need to know: http://wyw.dcweb.cn/stdcall.htm Regards
Re: Using MinGW DLL with DMD?
On Thursday, 9 August 2012 at 13:48:14 UTC, Adam D. Ruppe wrote: On Thursday, 9 August 2012 at 13:43:18 UTC, Jacob Carlborg wrote: Is it possible to link a DLL compiled for MinGW with DMD? Yeah, I've use dlls made in gcc with dmd. You need to run implib over the dll to get a .lib and then it works pretty easily. implib /s mydll.lib mydll.dll implib can be found in the basic utilities package at digital mars. http://www.digitalmars.com/download/freecompiler.html Yes, this works in most cases, but when it does not, then you have to use DEF files and modify/add symbols. It is not complicated, just time-consuming...
Re: Concurrency in D
On Thu, 28 Jun 2012 00:34:50 +0200, Minas Mina wrote: I have been playing latetly with std.concurrency and core.thread. I like both, but they are entirely different approaches to concurrency. std.concurrency: Uses message passing. Does not allow passing of mutable types. core.thread: Essentially the same as the approach taken by Java. 1) Is one favoured over the other? I guess std.concurrency would be, because it uses messages (and I recently read somewhere that immutability + message passing = good thing). Well, my problem about is, how can send mutable data to another thread? _Can_ I do it? If not, how am I supposed to share data between them? Not everything can be immutable right? For example I would like to have a thread calculate the sum of the first half of an array while another thread would calculate the other half, and I could add the two results at the end. 2) What about core.thread? To do proper sync between threads in core.thread, semaphore, mutexes and stuff like that are needed. Are those good practice in D? 3) I have also read a bit about syncronized classes and shared classes/structs, altough I didn't understand it too much (well I didn't try too much to be honest). For all those appoaches, which is the preffered? For all those appoaches, which is the preffered for game programming? Thank you. Both std.concurrency and std.parallelism need core.thread in order to do what they do... -- Dejan Lekic mailto:dejan.lekic(a)gmail.com http://dejan.lekic.org
Re: foreach syntax
On Fri, 29 Jun 2012 12:47:28 +0200, Namespace wrote:
A friend of mine ask me why D's foreach isn't like C#
Means, why is it like int[] arr = [1, 2, 3];
foreach (int val; arr) {
and not foreach (int val in arr) {
which it is more intuitive.
I could give him no clever answer to, so maybe someone here knows the
reasons.
Because
1) in is a D keyword
2) D has even shorter syntax: foreach(val; arr) {}
--
Dejan Lekic
mailto:dejan.lekic(a)gmail.com
http://dejan.lekic.org
Re: Segmentation fault hell in D
On Fri, 08 Jun 2012 19:57:47 -0700, Andrew Wiley wrote: On Fri, Jun 8, 2012 at 11:29 AM, Jonathan M Davis jmdavisp...@gmx.comwrote: On Friday, June 08, 2012 19:30:57 Jarl André jarl.an...@gmail.com@puremagic.com wrote: Evry single time I encounter them I yawn. It means using the next frickin hour to comment away code, add more log statements and try to eleminate whats creating the hell of bugz, segmantation fault. Why can't the compiler tell me anything else than the fact that i have referenced data that does not exist? Thanks I knew that. Now, please tell me where the error occured Jeezes. Turn on core dumps and use gdb. It'll give a backtrace and allow you to look at the state of the program when the segfault occured. That's pretty much the standard way to figure out what happened when a segfault occurs. And use GDC because DMD's debug symbols on Linux are broken enough to crash GDB at times. GDC is generally flawless. div class=gmail_quoteOn Fri, Jun 8, 2012 at 11:29 AM, Jonathan M Davis span dir=ltrlt;a href=mailto:jmdavisp...@gmx.com; target=_blankjmdavisp...@gmx.com/agt;/span wrote:brblockquote class=gmail_quote style=margin:0px 0px 0px 0.8ex;padding-left:1ex;border-left-color:rgb(204,204,204);border-left- width:1px;border-left-style:solid On Friday, June 08, 2012 19:30:57 Jarl Andréquot;br divdivlt;a href=mailto:jarl.an...@gmail.com; target=_blankjarl.an...@gmail.com/agt;@a href=http://puremagic.com; target=_blankpuremagic.com/a wrote:br gt; Evry single time I encounter them I yawn. It means using the nextbr gt; frickin hour to comment away code, add more log statements andbr gt; try to eleminate whats creating the hell of bugz, segmantationbr gt; fault. Why can#39;t the compiler tell me anything else than the factbr gt; that i have referenced data that does not exist? Thanks I knewbr gt; that. Now, please tell me where the error occured Jeezes.br br /div/divTurn on core dumps and use gdb. It#39;ll give a backtrace and allow you to lookbr at the state of the program when the segfault occured. That#39;s pretty much thebr standard way to figure out what happened when a segfault occurs.br /blockquotediv /divdivAnd use GDC because DMD#39;s debug symbols on Linux are broken enough to crash GDB at times. GDC is generally flawless. /div/div Ah noes, HTML code again... -- Dejan Lekic mailto:dejan.lekic(a)gmail.com http://dejan.lekic.org
Re: Build / Package system
On Wednesday, 30 May 2012 at 08:13:34 UTC, Sputnik wrote: There is a build and/or package managment system for D2 that is working? I googled, and I only can find things like dsss or cmaked that don't get updated from a long time ago. I really need to manage to get a project to compile in Windows and Linux. Actually the code not have any OS dependence, so the real diferences in each OS are the linking to gtkd and how and where install the project. Actually I'm using a makfile in Linux that works well, but I can't use it in windows for thing like pkg-config. You can. I use pkg-config on Windows inside the MSYS environment.
Re: Simplified socket creation and handling
On Friday, 18 May 2012 at 06:35:59 UTC, Jarl André wrote: I am a Java developer who is tired of java.nio and similar complex socket libraries. In Java you got QuickServer, the ultimate protocol creation centered socket library. You don't have to write any channels and readers and what not. You just instantiate a server, configures the handlers (fill in classes that extends a handler interface) and there you go. Shouldn't there exist a similar library in any programming language? Not doing so is assuming that developers always need control of the lower layers. Its not true. I care about protocol. Not sockets. Is there any abstraction layers in phobos? Or is everything just as complex as before? I use QuickServer myself, and was thinking about creating something like that in D for quite some time...
Re: state of web programming
bioinfornatics wrote: it is a list of project lo look if yo want create a web application in D - https://github.com/mrmonday/serenity - https://github.com/adamdruppe/misc-stuff-including-D-programming-language- web-stuff - https://github.com/Aatch/dfcgi - https://github.com/rejectedsoftware/vibe.d Add yours, tell which is better ... http://vibed.org -- http://dejan.lekic.org
Re: unsynchronized access to primitive variables
On Saturday, 19 May 2012 at 08:16:39 UTC, luka8088 wrote:
Hello to all,
I would like to know if D guarantees that access to primitive
variable is atomic ?
I was looking for any source of information that says anything
about unsynchronized access to primitive variables. What I want
to know is if it is possible (in any way and any OS / hardware)
for the following code to output anything other then 1 or 2:
import std.stdio;
import core.thread;
void main () {
int value = 1;
(new Thread({ value = 2; })).start();
writeln(value);
}
Thanks !
This proggy will always print 1 because writeln() prints the
value from the main thread. Spawned thread will have own value.
Remember TLS is the default storage.
Re: Object Serialization?
dcoder wrote: Hello. I'm probably not looking hard enough, but Do we have any standard d-library for serializing an object/object tree into -for example- an xml file? thanks. You have following - Orange - Thrift implementation - BSON (http://vibed.org) Probably wrappers or bindings to (all) other serialisation libraries as well. Regards
Re: Malloc in D
On Friday, 27 April 2012 at 09:05:12 UTC, Marcin wrote:
Hi!
I find code:
[code]
import c.stdlib;
import c.stdlib;
import std.outofmemory;
class Foo{
static void[] buffer;
static int bufindex;
static const int bufsize = 100;
static this(){
void *p;
p = malloc(bufsize);
if (!p)
throw new OutOfMemory;
gc.addRange(p, p + bufsize);
buffer = p[0 .. bufsize];
}
static ~this(){
if (buffer.length){
gc.removeRange(buffer);
free(buffer);
buffer = null;
}
}
new(uint sz){
void *p;
p = buffer[bufindex];
bufindex += sz;
if (bufindex buffer.length)
throw new OutOfMemory;
return p;
}
delete(void* p){
assert(0);
}
static int mark(){
return bufindex;
}
static void release(int i){
bufindex = i;
}
}
void test(){
int m = Foo.mark();
Foo f1 = new Foo; // allocate
Foo f2 = new Foo; // allocate
Foo.release(m); // deallocate f1 and f2
}
[/code]
When I try compile i have some error:[code]
vander@vander-VirtualBox:~/Pulpit/D$ gdc Memory.d -o Memory
Memory.d:1: Error: module stdlib is in file 'c/stdlib.d' which
cannot be read
import path[0] =
/usr/lib/i386-linux-gnu/gcc/i686-linux-gnu/4.4.5/../../../../../include/d/4.4.5/i686-linux-gnu
import path[1] =
/usr/lib/i386-linux-gnu/gcc/i686-linux-gnu/4.4.5/../../../../../include/d/4.4.5
vander@vander-VirtualBox:~/Pulpit/D$[/code]
When i comment import c.stdlib;
I have error
[code]
vander@vander-VirtualBox:~/Pulpit/D$ gdc Memory.d -o Memory
Memory.d:11: Error: undefined identifier malloc
Memory.d:11: Error: function expected before (), not __error of
type _error_
Memory.d:13: Error: identifier 'OutOfMemory' is not defined
Memory.d:13: Error: OutOfMemory is used as a type
Memory.d:13: Error: new can only create structs, dynamic arrays
or class objects, not void's
Memory.d:13: Error: can only throw class objects, not type void*
Memory.d:14: Error: undefined identifier gc, did you mean
static import gcc?
Error: no property 'addRange' for type 'TOK149'
Memory.d:14: Error: function expected before (), not __error of
type TOK149
Memory.d:19: Error: undefined identifier gc, did you mean
static import gcc?
Error: no property 'removeRange' for type 'TOK149'
Memory.d:19: Error: function expected before (), not __error of
type TOK149
Memory.d:20: Error: undefined identifier free, did you mean
function fread?
Memory.d:20: Error: function expected before (), not __error of
type _error_
Memory.d:29: Error: identifier 'OutOfMemory' is not defined
Memory.d:29: Error: OutOfMemory is used as a type
Memory.d:29: Error: new can only create structs, dynamic arrays
or class objects, not void's
Memory.d:29: Error: can only throw class objects, not type void*
vander@vander-VirtualBox:~/Pulpit/D$
[/code]
What's can be wrong?
You probably have a very old GDC...
1) GC is a Struct inside core.memory so you need a line:
GC gc;
2) You need to throw OutOfMemoryError which is defined in
core.exception.
3) You need const(void*) pointers for GC methods.
So I first recommend you install latest GDC, and then modify your
code to be more up-to-date.
I hope this helps.
Regards :)
Re: Templates in classes = what is wrong?
On Tuesday, 17 April 2012 at 14:57:18 UTC, Xan wrote:
On Tuesday, 17 April 2012 at 01:31:43 UTC, Kenji Hara wrote:
On Monday, 16 April 2012 at 18:48:52 UTC, Xan wrote:
On Sunday, 15 April 2012 at 19:30:27 UTC, Ali Çehreli wrote:
On 04/15/2012 11:39 AM, Xan wrote:
On Sunday, 15 April 2012 at 11:23:37 UTC, John Chapman
wrote:
On Sunday, 15 April 2012 at 11:16:43 UTC, Xan wrote:
int main(string [] args)
{
auto alg = Algorisme!(int,int);
Should be:
auto alg = new Algorisme!(int, int);
alg.nom = Doblar;
alg.versio = 1;
alg.funcio = (int a) {return 2*a};
Should be:
alg.funcio = (int a) { return 2 * a; };
or:
alg.funcio = a = 2 * a;
}
It does not work:
$ gdmd-4.6 algorisme.d
algorisme.d:18: Error: variable algorisme.main.alg voids
have
no value
algorisme.d:18: Error: expression class Algorisme is void
and
has no value
with the code https://gist.github.com/2394274
What fails now?
Thanks,
Xan.
Your code is still missing 'new':
auto alg = new Algorisme!(int, int);
With only this change, I receive this error:
$ gdmd-4.6 algorisme.d
algorisme.d:21: Error: cannot implicitly convert expression
(__dgliteral1) of type int delegate(int a) pure nothrow to
int function(int)
Unrelated recommendations:
- Return 0 from main() for successful exit, anything else by
convention means some sort of error.
- Take advantage of constructors (and 'alias') to simplify
syntax and risk of bugs:
import std.conv, std.stdio, std.stream, std.string;
import std.socket, std.socketstream;
import std.datetime;
class Algorisme(U,V) {
string nom;
uint versio;
alias V function (U) Funcio;
Funcio funcio;
this(string nom, uint versio, Funcio funcio)
{
this.nom = nom;
this.versio = versio;
this.funcio = funcio;
}
}
int main(string [] args)
{
alias Algorisme!(int, int) MeuAlgorism;
auto alg = new MeuAlgorism(Doblar, 1,
(int a) { return 2 * a; });
return 0;
}
Ali
With all of your suggestion
[https://gist.github.com/2394274], I get:
$ gdmd-4.6 algorisme.d
algorisme.d:30: Error: constructor
algorisme.Algorisme!(int,int).Algorisme.this (string nom,
uint versio, int function(int) funcio) is not callable using
argument types (string,int,int delegate(int a) pure nothrow)
algorisme.d:30: Error: cannot implicitly convert expression
(__dgliteral1) of type int delegate(int a) pure nothrow to
int function(int)
algorisme.d:27: Error: function D main has no return
statement, but is expected to return a value of type int
What fails?
PS: Thanks for your recommendations...
PPS: By the other hand, I see you have learned catalan
(MeuAlgorisme?) ;-)
Problem may be here:
alg.funcio = (int a) { return 2 * a; };
2.057 and earlier (You may use gdc 2.057 and command line
wrapper gdmd), function literal always deduced as 'delegate'.
So this expression raises an error about type mismatching Lhs
of 'int function(int)' and Rhs of 'int delegate(int) pure
nothrow'.
Then, specifying explicit 'function' will resolve issue:
alg.funcio = function(int a) { return 2 * a; };
Bye.
Kenji Hara
Thanks, Kenji. If I change function to delegate in declaration
of field, it works too. What do you recommend to have delegates
or functions? What are the benefits and ...
Thanks,
Xan.
For an example, you can't use function-pointer to access
non-static methods, while with delegates you can. You can see
some examples on http://www.dlang.org (Languate Reference).
Re: shared status
On Saturday, 14 April 2012 at 10:48:16 UTC, Luis Panadero Guardeño wrote: What is the status of shared types ? I try it with gdmd v4.6.3 And I not get any warring/error when I do anything over a shared variable without using atomicOp. It's normal ? shared ushort ram[ram_size]; ram[i] = cast(ushort) (bytes[0] | bytes[1] 8); Shared is crucial for concurrency/parallelism since the switch to the thread local storage as default storage. Immutable values are IMPLICITLY SHARED while for your mutable data you have to explicitly use shared keyword. This basically means that SHARED data are used everywhere in D applications nowadays.
Re: Aquivalent References as in C++?
On Tuesday, 17 April 2012 at 09:39:10 UTC, Namespace wrote:
On Tuesday, 17 April 2012 at 08:02:02 UTC, Namespace wrote:
Now i have something like this. It works and manipulates
lvalues so that i can pass my objects by ref to except null.
But is this smart?
class Bar {
public:
int x;
static ref Bar opCall(int x) {
static Bar b;
b = new Bar(x);
return b;
}
this(int x) {
this.x = x;
}
}
class Foo {
private:
Bar _bar;
public:
int y;
this() { }
this(ref Bar b) {
//assert(b !is null);
writefln(B.x %d, b.x);
}
}
Bar b = new Bar(42);
new Foo(b); // works
new Foo(null); // compiler error
new Foo(Bar(23)); // works
new Foo(Bar(25)); // works
But if I write
Bar bn;
new Foo(bn);
it works also and doesn't throw a compiler error.
To avoid this, I have to write an assert(obj !is null); again.
This really sucks. If anybody else works with my Code and puts
a null reference to any method he gets no compiler error and
wonder why he gets a runtime error instead.
Thats very annoying...
For that, you have static if contitions, and indeed you can make
it a compile-time error.
Re: actors library?
Xan, read this article please: http://www.informit.com/articles/article.aspx?p=1609144 You have exactly what you are looking for in the D runtime and standard library.
Re: learn D TDPL
Many things changed since the book has been released. I is strange that you did not see the link to the TDLP errata (http://erdani.com/tdpl/errata/) by now. :)
Re: Calling a C++ Object from D
Unfortunately, you cant use C++ namespaces. More about interfacing to C++ here: http://www.dlang.org/cpp_interface.html . The easiest way to solve this is to write a C function that will glue your code with the C++ library.
Re: floating-WTF
No, it is not a bug.
Here is a hint:
import std.stdio;
int main() {
float f;
writeln(f);
return 0;
}
/+--- output --+
nan
+--- end of output ---+/
Re: KeyType, ValueType traits for hashes
Andrej, I agree, they should be in std.traits .
Is D associative array thread safe, and will it relocate memory when add or delete a value?
On 2011-Dec-07 02:17:17+00:00, raojm wrote: Is D associative array thread safe, and will it relocate memory when add or delete a value? Where I can find the implemention. Phobos and druntime are on GitHub, you can always check out the source...
Re: C++ vs D aggregates
What does not? Yes, that kind of struct will work. :) Try to add a constructor...
Re: Compile time metaprogramming
David, to be frank, your code is already useful! Something is better than *nothing*! I hope you or someone else will continue with these two modules, and include them in Phobos.
C++ vs D aggregates
I recently stumbled on this thread: http://stackoverflow.com/ questions/5666321/what-is-assignment-via-curly-braces-called-and-can-it- be-controlled The important part is this: 8 - begin - The Standard says in section §8.5.1/1, An aggregate is an array or a class (clause 9) with no user-declared constructors (12.1), no private or protected non-static data members (clause 11), no base classes (clause 10), and no virtual functions (10.3). And then it says in §8.5.1/2 that, When an aggregate is initialized the initializer can contain an initializer-clause consisting of a brace-enclosed, comma-separated list of initializer-clauses for the members of the aggregate, written in increasing subscript or member order. If the aggregate contains subaggregates, this rule applies recursively to the members of the subaggregate. 8 - end - Do D2 aggregates behave the same, or are there notable differences?
Re: piping processes
NMS wrote: Is there a cross-platform way to create a new process and get its i/o streams? Like java.lang.Process? I doubt. However, you can use platform-specific popen() (POSIX) and _popen() (Windows) for that. I recently talked about this on IRC. At the moment Phobos uses system() , redirects the output of a command to a temp file, and reads the file (that is how the shell() is implemented on Windows). My question was - why not using _popen() ???
Re: piping processes
We talked about that too on IRC - the conclusion was - we should have std.pipe module with (at least) AnonymousPipe, and NamedPipe classes.
Re: DFastCGI
Good news! This should be a part of the Deimos organisation. :) Also, the post should be in the D.announce newsgroup. :) Well-done!
Re: Fields size property
This one is not good either because it does not include TypeInfo, etc... __traits(classInstanceSize, T)) is better choice, as Ali said... :)
Re: Fields size property
Andrej Mitrovic wrote:
.sizeof on a struct works nicely since it's a POD, but this can't work
on classes since it just returns the pointer size.
I don't know whether this is useful all that much, but I'm curious how
large my classes are. Anyway, since I couldn't find anything in Phobos
I've got this working:
import std.traits;
auto getFieldsSizeOf(T)() {
size_t result;
foreach (type; RepresentationTypeTuple!Foo) {
result += type.sizeof;
}
return result;
}
template fieldsSizeOf(T) {
enum size_t fieldsSizeOf = getFieldsSizeOf!T();
}
class Foo { int x, y; }
static assert(fieldsSizeOf!Foo == 8);
void main() { }
Sure it can be useful sometimes to know (roughly) the size of your classes.
I modified the function to:
auto getFieldsSizeOf(T)() {
size_t result;
foreach (type; RepresentationTypeTuple!T) {
static if (is(type == class) ) {
result += getFieldsSizeOf!type();
} else {
result += type.sizeof;
}
}
return result;
}
As you can see, it goes little bit deeper so code like this:
class Bar { int x, y; Foo f; }
writeln(fieldsSizeOf!Bar);
gives us 16 as output not 8.
Re: Generic array
RenatoL wrote: ##[3] arr = [0, aa, 2.4]; What can i put instead of ##? In C#, just for example, i can write: object[] ar1 = new object[3]; ar1[0] = 1; ar1[1] = hello; ar1[2] = 'a'; and it works. But in D Object[3] arr0 = [0, aa, 2.4]; and compiler complains In D, the equivalent would be: Variant[] arr = variantArray(0, aa, 2.4);
Re: Mutable enums
so wrote: immutable a; sort(a); But with current design you can do: enum a; sort(a); Which is to me, quite wrong. It is not wrong at all.
Re: Database API
Somedude wrote: Hello, what is the currently DB API considered usable today ? http://prowiki.org/wiki4d/wiki.cgi?DatabaseBindings#ODBC d-dbapi looked quite decent, but the source code is no longer available :( Thank you Dude Try this alternative - http://www.dsource.org/projects/ddbi/ - I remember brainstorming DDBI with its author some 6-7 years ago on the irc://irc.freenode.org/d channel. :) Then Lars took over the project so I believe it is becoming better and better.
Re: web development in D programming
bioinfornatics wrote: I am a little disapointed, so if you have many request for a web page this lib http://arsdnet.net/dcode/ is usable or not ? I am developing an implementation of the FastCGI protocol (http://www.fastcgi.com) in D2 with the main goal go have multiplexing support. However the development is slow due to the lack of time. I believe a good http server implementation would be appreciated by the community, but FastCGI server will make it possible to create a highly- scalable web applications using some of the well-known web servers (I use Lighttpd for an example). Your code is usable, but not production-ready.
Is there a portable way to limit memory/cpu usage of a D application?
I would be satisfied with something like POSIX.1-2001 setrlimit() . Sure nothing prevents me from using setrlimit() in my D app, but perhaps it is something to think about a portable way of doing that. One thing I like about my Java apps is that I can always specify (in the argument list) how much memory I want to allocate for them). Yes, it is a JVM specific thing, but perhaps a GC should have options to set at least the memory limit? Kind regards
Re: My new least favorite one-liner...
Regan Heath wrote: You've also got std.ascii.digits which is 0123456789 and std.string.digits which is an alias of it, so you can say: import std.ascii; (or std.string) int x = 5; char c = std.ascii.digits[x]; I used similar solution to bearophile's before. I must admit i did not know about std.ascii.digits[], thanks for the info Regan.
Re: extends and implements
Andrej Mitrovic wrote:
class Rectangle : IShape, Drawable {}
It's pretty common in other languages, I've seen it used in D as well.
I used the same naming convention for interfaces until I saw this
presentation: http://www.infoq.com/presentations/It-Is-Possible-to-Do-OOP-
in-Java (jump to 0:42 if you do not want to see this brilliant
presentation).
In short there is an interface RecentlyUsedList, and Kevin recommends that
good name for implementation is something like ArrayBasedRecentlyUsedList.
And he is also against IRecentlyUsedList names... I actually agree with what
he suggests, and stopped using INames for interfaces. :)
PS. the presentation is not Java advocacy, it contains lots of Java
criticism...
Re: Stop TypeTuple as template parameter from expanding
bearophile wrote: Tobias Pankrath: How would you do this? Do I need an extra template TypeList? It's the design of typetuples, they are auto-flattening. I have never appreciated this design. Maybe Walter likes them this way, or they can't be designed in another way, I don't know. Bye, bearophile bearophile - I believe it is a matter of taste. I actually prefer it the D way because (S, T...) is a TypeTuple as well. (MyList, A, B, C) expands to (A, B, C, A, B, C) so it makes sense that Test prints what it prints. It is all natural to me... It should be like that in my humble opinion. Perhaps the documentation should be more clear about this.
Re: FIFO stack
Dominic Jones wrote: Hello, I was looking for a FIFO stack in std.containers but only found SList and Array which both appear to essentially operate as LIFO stacks. Is there any standard container with which I can push items on to a list, then later pop them off from the bottom of that list? If so, then how? Thank you, Dominic Jones The Array can be used as both LIFO and FIFO structure.
