I'm using the built-in curl library on Linux i'm getting linker
errors. I've installed libcurl4-openssl-dev and it works fine as
i can successfully compile a sample program. However when using
the D lib i get these errors:
[quote]
:!rdmd api_test.d
Yeah invoking the linker manually works fine.
To save me from that each time i've actually added '-L-lphobos2'
to the end of 'DFLAGS' in '/etc/dmd.conf' so phobos is always
before curl in the linker argument list. When the program is
compiled '-L-lphobos2' appears twice in the args but that's
What was the reason for not including 'std.net.curl' in the
Windows phobos library? I've added it and recompiled phobos for
use but i just wondered why it was missing?
For others i blogged how to recompile with curl support here:
http://kalekold.net/index.php?post=19
IIRC it is licencing issues, they can't include curl in the
distribution
without certain requirements that were deemed to awkward to
implement.
Ah, right.
On Tuesday, 25 September 2012 at 21:51:40 UTC, Matthew Turner
wrote:
Hello,
I'm wondering if there is any library for making a GUI with D.
If not, what would you recommend for that? Could I just use
c++ libraries?
Thank you,
Matt
GtkD is probably your best bet. I wrote a blog post here
I want to do something like this (Collection is a custom type):
Collection x = new Collection();
x.add(something);
x.add(somethingElse);
foreach(type value; x)
{
writeln(value);
}
Collection is a class with a private array member variable which
actually holds the collection data entered
1. Define opApply (see section labeled Foreach over Structs
and Classes with
opApply after here:
http://dlang.org/statement.html#foreach_with_ranges)
2. Or make it a range (see
http://dlang.org/statement.html#foreach_with_ranges
and http://ddili.org/ders/d.en/ranges.html ), which would
Are there any decent wrappers available for D to allow me to read
data from a file and place it into a MySql database. I'm using
Mac OS 10.8. Is there an official library? Has anyone used MySql
with D on Mac OS?
Thanks.
Is there anything in the standard library to help writing a file
watcher? I want to monitor a single file for changes and if a
change is detected call a function. Is there any existing
libraries to do this in D as it must be cross-platform as much as
possible?
Why won't the following code compile? Here's the error:
filewatcher.d(21): Error: cannot implicitly convert expression
(new File(file, r)) of type File* to shared(_iobuf)*
/**
* Imports.
*/
import std.stdio;
/**
* A class to watch for changes in a file.
*/
class Example
{
/**
Hmmm.. this is what i first thought. I think i'll implement a
simple watcher based on modification times as a first iteration.
Then if time allows add platform specific solutions based on the
above. Thanks.
File is a wrapper around a FILE*, it's not the same as a FILE*
No need for new, File is a struct, new is (normally) for
classes. No need for this., although there's no harm in it.
Ah yes, thanks.
Hmmm... Following your example i'm still having problems
compiling this simple snippet:
import std.stdio;
class Example
{
private FILE _file;
public this(string file)
{
this._file = File(file, r);
}
}
Error:
test.d(9): Error: cannot implicitly
you former
private FILE* _file wasn't an File
and your current
private FILE _file is still not File
because FILE and File is something differnt (case sensitive)
why not write
private File _file
Gah! of course. Thanks. I think i better get some sleep...
On Saturday, 2 March 2013 at 18:42:13 UTC, Andrej Mitrovic wrote:
On 3/2/13, simendsjo simend...@gmail.com wrote:
Which can you recommend?
I use ae's lite xml library:
https://github.com/CyberShadow/ae/blob/master/utils/xmllite.d
It's not a monster but thanks to UFCS I can easily extend it
Is there any examples of using inotify with D?
http://en.wikipedia.org/wiki/Inotify
I've updated the old tango header file and tried to get something
working but it seems to hang. If anyone else has code using
inotify i'd love to take a look to see how you have used it. ta.
On Saturday, 25 May 2013 at 21:19:30 UTC, Gary Willoughby wrote:
Is there any examples of using inotify with D?
http://en.wikipedia.org/wiki/Inotify
I've updated the old tango header file and tried to get
something working but it seems to hang. If anyone else has code
using inotify i'd love
This is quite an open ended question but i wondered how you guys
debug your D programs (i'm talking about stepping through code,
setting breakpoints, etc). The lack of nice IDE's with integrated
debuggers is worrying when working with D but up until now i
haven't need one.
Now i've started
Why does the following snippet print:
Started name revision instead of Started my-app 1.0a?
import std.stdio;
enum application : string
{
name = my-app,
revision = 1.0a,
}
void main(string[] arguments)
{
writefln(Started %s %s, application.name,
application.revision);
}
I was trying some funky stuff with D, not real code just playing
and I got a message of a seg fault and a core dump written to a
log. I just wondered where these logs are written to. It's not
immediately apparent where it is.
On Tuesday, 28 May 2013 at 21:15:55 UTC, Adam D. Ruppe wrote:
On Tuesday, 28 May 2013 at 21:06:14 UTC, Gary Willoughby wrote:
playing and I got a message of a seg fault and a core dump
written to a log.
like this?
Segmentation fault (core dumped)
That's actually more of a linux thing than
On Monday, 3 June 2013 at 14:55:03 UTC, Gary Willoughby wrote:
When creating documentation using ddoc there is no CSS file
specified in the head of the generated HTML file. How can i
tell ddoc to generate documentation and use a custom CSS file
for the styles?
Just found the answer here
I've been doing some coding and noticed something strange with
core.sys.posix.signal. In the following snippet you will see that
i have to decorate the handleTermination function with extern(C)
to satisfy the type requirements of the bsd_signal function.
import core.sys.posix.signal;
import
I've been using the -property compiler flag when i compile
programs and thought it was pretty cool but i've recently had a
conversation with someone who has informed me it's broken and a
bad idea.
Never, ever, ever use -property. Its implementation is totally
wrong
and based on a flawed idea
On Wednesday, 5 June 2013 at 18:54:45 UTC, Jesse Phillips wrote:
Not going to look into the file, but I'm pretty sure bsd_signal
is function for an external C library right?
If that is the case, it must use C calling convention, so yes
this is correct.
Ah sorry i wasn't clear.
The question
You probably don't want to read it. It's huge. I'll try and
summarize the situation.
- Jonathan M Davis
Thanks for a great overview, that's cleared things up nicely.
You are passing a function pointer to a C library, where it
will be expected that the function uses the C calling
convention. So you have to declare the function as extern(C),
otherwise DMD will not compile it as such. That can cause
segfaults.
Right ok thanks.
On Friday, 7 June 2013 at 13:45:50 UTC, Daemon wrote:
The only thing that remains is patience I guess.
That, buy Andrei's book and ask questions here. :)
http://www.amazon.co.uk/The-Programming-Language-Andrei-Alexandrescu/dp/0321635361
I know the reason to mark a method as trusted from the docs:
Trusted functions are guaranteed by the programmer to not
exhibit any undefined
behavior if called by a safe function. Generally, trusted
functions should be kept
small so that they are easier to manually verify.
Undefined
I get a program crash each time running the following code on
MacOS 10.8 (Lion). It seems to run ok on Ubuntu 12.04:
import core.sys.posix.sys.stat;
import core.sys.posix.unistd;
import std.c.stdio;
import std.c.stdlib;
import std.process;
import std.stdio;
import std.string;
import std.file;
Another crash (Mac OS 10.8) here but this one doesn't seem to
raise a crash dump. Also it seems to work fine on Ubuntu 12.04
import core.sys.posix.sys.stat;
import core.sys.posix.unistd;
import std.c.stdio;
import std.c.stdlib;
import std.process;
import std.stdio;
import std.string;
import
You do know that you usually don't have a /home/ directory on
Mac OS X? On Mac OS X it's called /Users/.
Yeah, that was me running the same code on Ubuntu.
BTW, running that on Mac OS X 10.6.3 does not cause a crash.
Although it doesn't seem to print or write anything.
That's the problem i
In fact i have the same problem reading files too. It only reads
files up to a certain amount of bytes then crashes in the same
manner explained above. Again this only happens when the program
runs as a daemon.
I'm writing a little program in D to perform some database
operations and have a small question about design.
Part of my program watches a log file for changes and this
involves code which is wrapped up in a class. So the usage is
something like this:
auto fileWatcher = new
Anyone got an example on how to spawn a thread using a class
method?
I want to wrap behaviour in a class and launch one of its methods
using a thread. Once the method is running i want to interact
with it from the main program by calling other methods which send
the thread messages.
I'm
Run as a daemon how?
By running the above code. All the code before opening the file
causes the program to run as a daemon.
Ah right, so you use a function as a wrapper around the delegate.
Thanks.
Interesting thanks.
Below is an example snippet of code to test for performance of
regex matches. I need to parse a large log and extract data from
it and i've noticed a huge increase in time of the loop when
reading and using regex.
...
auto alert = regex(r^Alert ([0-9]+));
while ((line
enum alert = ctRegex!r^Alert ([0-9]+);
And then use it the same way.
Thanks. Hmmm.. i get 500K (worse performance) using that. :/
Any more tips?
I iterated on Ali's solution with more OOP to demonstrate
features you may find interesting.
import std.stdio;
interface IBar
{
@property int val();
}
class Bar : IBar
{
protected int _val;
@property int val()
{
return this._val;
}
}
I'm working with some string-heavy applications so I was
curious about this myself. I'm new to D, but I did some heavy
data analysis on chat files a while back.
Not knowing anything about your data or what other queries you
might want to do on it, matching the first part of the string
with
I have a simple problem, I want to open a file and read data from
it. When the file changes, i will read more data. The trouble is
i only want to open the file once.
Here's the simplified code:
import core.thread;
import std.stdio;
void main(string[] args)
{
auto file =
auto file = File(file.txt, r);
char[1024] buffer;
char[] line;
writeln(First Read:);
while ((line = file.rawRead(buffer)) !is null)
{
write(line);
}
Thread.sleep(dur!(seconds)(5));
writeln(Second Read:);
This must be platform-dependent. Your program works as expected
under my Scientific Linux distribution. (Same as Red Hat.)
Ali
You're right, it seems to be a Mac OS limitation. It works fine
here on Ubuntu.
Have you any tips for using D when you need fast string
concatenation? I regularly use code like this:
foreach (i, range)
{
foo ~= bar;
}
or:
foo = foo ~ bar ~ baz ~ qux;
I've used std.string.format(...) in some instances which sped
things up which surprised me.
Yes i know it's horrible but is it possible to use global
variables spanning modules?
I need to capture a small amount of program data and deal with it
in termination signal handlers. The data will be captured from
various classes spread around different modules.
I'm thinking the easiest
On Friday, 21 June 2013 at 16:29:06 UTC, bearophile wrote:
Gary Willoughby:
is it possible to use global variables spanning modules?
Why don't you use a __gshared module-global var, and then
import it in all the modules where you need it?
Bye,
bearophile
I've just been looking
That works great thanks all.
Just for a bit of fun, I saw this question posted on reddit the
other day and wondered how *you* would solve this in D?
http://stackoverflow.com/questions/731832/interview-question-ffn-n
The text from the question:
Design a function f, such that:
f(f(n)) == -n
Where n is a 32 bit signed integer; you can't use complex numbers
arithmetic.
If you can't design such a function for the whole range of
numbers, design it for the largest range possible.
You must pass a shared object:
Thanks!
I was hoping the below example would display 'hello world' but it
only displays 'hello'. Is this a bug in the concurrency lib or am
i using it incorrectly?
import std.stdio;
import std.concurrency;
void writer()
{
try
{
while (true)
{
If you remove the the try..catch you will notice that
OwnerTerminated is
thrown, if this is the intended behaviour, I don't know.
Probably is,
because this would be a pretty obvious bug.
Ah right, so i guess the main thread is finishing and throwing
the exception to writer before sender has
Use core.stdc, and forget of std.c.
Bye,
bearophile
What's the reason for that?
On Tuesday, 2 July 2013 at 12:52:49 UTC, bearophile wrote:
Adam D. Ruppe:
The older std.c is kept around just for compatibility with the
old names before the move, at least as far as I know. Maybe
they haven't fully deprecated it though because there's other
reasons I don't know about, since
I have an interface like this:
interface IAccessor
{
public ResultSet getCacheData();
public bool persist(T)(ref T[] collection);
}
Then i'm composing an object constraining via that interface:
...
private IAccessor _accessor
public void setAccessor(IAccessor accessor)
{
Also i've noticed that the compiler doesn't complain if templated
functions are not implemented in the classes that implement the
interface, which is wrong!
What is the correct way to test for an empty string?
I've used
if (string == )
and
if (string is null)
and both (O_o) in some places, it's starting to do my head in.
What is the correct way?
On Tuesday, 16 July 2013 at 19:33:13 UTC, bearophile wrote:
The right, safe and readable way is to use std.array.empty:
if (myString.empty)
OMG, of course. Thanks!
Are associative arrays stable in D? I have to ask because i'm
having a great deal of problems with them for simple operations.
For example the following crashes.
import std.stdio;
void main(string[] args)
{
int[string] waiting;
waiting[gary] = 1;
waiting[tess] = 2;
Why does this template not have the desired result? I honestly
though it would return true.
import std.stdio;
template inBounds(size_t size, T)
{
enum result = (size = T.min size = T.max);
}
void main(string[] args)
{
writefln(%s, inBounds!(10, int).result); // false! eh?
}
The way I'd do the inBounds is to just use T size instead of
size_t size.
template inBounds(T, T size) { snip same stuff }
then
writefln(%s, inBounds!(int, 10).result); // true as
expected
The problem with that though is that with size arguments
int.max will wrap when being cast
I've just read the article over at Dr Dobbs by Walter
http://www.drdobbs.com/cpp/increasing-compiler-speed-by-over-75/240158941
and this line caught my eye:
Even if you know your code well, you're likely wrong about where
the performance bottlenecks are. Use a profiler. If you haven't
used
I'm writing a program that deals a lot with dates in unix
timestamp format. I need to 'normalise' this timestamp to only
give me the date and not the time. To do this i thought of using
only midnight on that day.
Here is the first attempt to normalise these dates:
protected uint
What D related (or interesting development based) twitter
accounts do you guys follow? I'm pretty new to twitter and trying
to follow accounts that i find interesting.
Whats the difference between a final and non-final switch
statement? I know the compiler complains when i don't use a
default case in a non-final switch statement but i've no idea why.
On Tuesday, 30 July 2013 at 10:29:45 UTC, Namespace wrote:
On Tuesday, 30 July 2013 at 10:14:50 UTC, Gary Willoughby wrote:
Whats the difference between a final and non-final switch
statement? I know the compiler complains when i don't use a
default case in a non-final switch statement
I've just finished a project in D and have been using rdmd to
compile during testing. While this is nice, i now want to try
other compilers to see if i get any speed gains.
Because i use rdmd it takes care of passing everything to dmd.
Now i want to try GDC and i need to pass the files in the
On Thursday, 1 August 2013 at 19:06:38 UTC, Dicebot wrote:
On Thursday, 1 August 2013 at 17:46:07 UTC, Gary Willoughby
wrote:
There must be a simpler way to pass these files to dmd in the
right order? rdmd does it somehow.
You do know that you can use GDC with rdmd? `rdmd
--compiler=gdmd
On Friday, 2 August 2013 at 14:28:39 UTC, H. S. Teoh wrote:
What version of GDC are you using?
T
~ gdc -v
Using built-in specs.
COLLECT_GCC=gdc
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/4.8/lto-wrapper
Target: x86_64-linux-gnu
Configured with: ../src/configure -v
What library commands do i use to read from a structured binary
file? I want to read the byte stream 1, 2 maybe 4 bytes at a time
and cast these to bytes, shorts and ints respectively. I can't
seem to find anything like readByte().
How big is the file?
If it's not too huge i'd just read it in with std.file.read and
then sort out splitting it up from there.
Quite large so i'll probably stream it. Thanks guys.
On Friday, 2 August 2013 at 22:13:28 UTC, Jonathan M Davis wrote:
I'd probably use std.mmfile and std.bitmanip to do it. MmFile
will allow you to
efficiently operate on the file as a ubyte[] in memory thanks
to mmap, and
std.bitmanip's peek and read functions make it easy to convert
multiple
On Saturday, 3 August 2013 at 18:14:47 UTC, Gary Willoughby wrote:
This sounds a great idea but once the file has been opened as a
MmFile how to i convert this to a ubyte[] so the std.bitmanip
functions work with it?
I'm currently doing this:
auto file = new MmFile(file.dat
Is it possible using reflection or similar to extract only public
method names from classes? I'm thinking how i would go about
writing a unit test/mocking framework, investigating how i can
gather information about such things before i manipulate them.
On Tuesday, 6 August 2013 at 22:55:49 UTC, Marek Janukowicz wrote:
Gary Willoughby wrote:
Is it possible using reflection or similar to extract only
public
method names from classes? I'm thinking how i would go about
writing a unit test/mocking framework, investigating how i can
gather
What's the D way of allocating memory? Do you guys just use
malloc() and free()? Or are there functions in phobos that should
be used? I just need a buffer of variable length allocating every
now and then.
On Wednesday, 7 August 2013 at 17:47:38 UTC, monarch_dodra wrote:
If you want to do semi-manual memory management, you can use
GC.malloc, which works like normal malloc, but is *still*
managed by the GC. I'd actually recommend GC.qalloc over
GC.malloc: it's the same function, but qalloc
On Thursday, 8 August 2013 at 11:18:16 UTC, Larry wrote:
https://github.com/rejectedsoftware/mysql-native/blob/master/README.md
the native D mysql driver.
But then, what to do with it ?
I've used this quite a bit and works quite nicely. I've found a
few bugs while using it and they have
On Wednesday, 7 August 2013 at 22:03:16 UTC, Ali Çehreli wrote:
qalloc seems better but just like in C and C++, when comparing
GC.malloc and GC.calloc, the default choice should always be
GC.calloc.
As a side note, i was just checking this out in core.memory and i
was surprised:
/**
On Friday, 9 August 2013 at 07:31:09 UTC, Larry wrote:
So many thanks !
Yes it is not very polished yet.
But now I see how I can manage it, I will follow your lead and
try things. :)
Thanks again,
Larry
Great! Remember if you have any issues or find any bugs raise an
issue on github.
On Friday, 9 August 2013 at 16:39:41 UTC, Alexandr Druzhinin
wrote:
-profile switch doesn't work for me (nothing happens), so I'm
curious how to profile?
I had the same problem on Linux where -profile didn't seem to
produce anything. I had a program which ran an infinite loop
running as a
I have defined the following module:
/**
* Module containing unit test helper functions for date time
operations.
*/
module common.test.unit.datetime;
/**
* Imports.
*/
import std.conv;
import std.datetime;
/**
* Return a unix timestamp.
*
* Params:
* T = The return type of the
On Wednesday, 14 August 2013 at 14:05:07 UTC, Jacob Carlborg
wrote:
Have you compiled all the files? Show us the command you use to
compile your code. Usually this is enough rdmd main.d, where
main.d is the file containing the main function.
I'm sure all source files are compiled during the
On Thursday, 15 August 2013 at 18:54:40 UTC, Jesse Phillips wrote:
I don't have an answer, but in case you are not familiar with
cryptic linker:
On Wednesday, 14 August 2013 at 13:21:49 UTC, Gary Willoughby
wrote:
But when i import it and use the getUnixTime function i get
the following
I've been researching ways to accomplish creating a template that
creates a special kind of derived type and i think i need a push
in the right direction. Take this simple class:
class Person
{
private string _name;
private int _age;
this(string name, int age)
On Thursday, 22 August 2013 at 13:20:44 UTC, evilrat wrote:
why do u link phobos when compiler do this for you?
For some reason the order of linked libs matters especially with
curl.
Using traits how do i get a methods's parameters as a string? Say
i have the following method:
...
public void setAge(int age)
{
this._age = age;
}
...
I want a string that is: (int age) or how ever many params
there are. The nearest i got was using this code:
Thanks all! :)
On Wednesday, 21 August 2013 at 03:37:46 UTC, Kapps wrote:
On Tuesday, 20 August 2013 at 18:55:44 UTC, Gary Willoughby
wrote:
I've been researching ways to accomplish creating a template
that creates a special kind of derived type and i think i need
a push in the right direction. Take
Do constructors in D support a privacy keyword? I'm guessing not
because if i declare one like this:
class T
{
private this()
{
}
}
i can still instantiate the class like this:
auto x = new T();
and there is no error thrown. Am i right in thinking the privacy
keyword is ignored?
On Saturday, 7 September 2013 at 18:49:43 UTC, H. S. Teoh wrote:
On Sat, Sep 07, 2013 at 08:37:05PM +0200, Gary Willoughby wrote:
Do constructors in D support a privacy keyword? I'm guessing
not
because if i declare one like this:
class T
{
private this()
{
}
}
i can still
When iterating through class members using traits how do you
filter out the member vars to only get a list of methods. I think
i've solved it in the code below but it feels like i am abusing
MemberFunctionsTuple. Is this the correct way to do this?
private template Methods(T, int index = 0)
{
On Sunday, 8 September 2013 at 13:46:26 UTC, Dicebot wrote:
http://dpaste.dzfl.pl/c250e798
import std.traits, std.range;
private template Methods(T)
if (is(T == class))
{
private string[] getMethods()
{
string result[];
On Sunday, 8 September 2013 at 17:07:57 UTC, Dicebot wrote:
On Sunday, 8 September 2013 at 16:43:16 UTC, Gary Willoughby
wrote:
This looks like a nice solution but i get errors when used
across modules. The problem is that allmembers emits private
members so across modules
Just wondered if i could pick you brains for a nice solution to
dynamically add methods to a class, paying particular attention
to overloads. I'm currently writing a mocking framework and
everything's coming along nicely and i'm wondering how to handle
replacing overloads of the mocked class.
On Tuesday, 10 September 2013 at 08:22:18 UTC, Namespace wrote:
I have already found an old bug report for this, but I do not
understand why it has still not been solved. Can someone
explain that to me?
Example:
a.d:
module a;
private import std.stdio : writeln;
b.d:
import
On Friday, 16 August 2013 at 09:52:53 UTC, Gary Willoughby wrote:
You might be onto something here as i only import this module
into unit tests. When i get time i'll investigate a little
further.
If i take the import out of the unit test and place it at the top
of my source file everything
On Tuesday, 10 September 2013 at 10:42:44 UTC, Gary Willoughby
wrote:
On Friday, 16 August 2013 at 09:52:53 UTC, Gary Willoughby
wrote:
You might be onto something here as i only import this module
into unit tests. When i get time i'll investigate a little
further.
If i take the import out
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