Re: Reading file contents when file has changed
On Jul 13, 2012 4:40 PM, OlaOst ola...@gmail.com wrote: I'm working on a program (using dmd 2.059 under windows) that automatically reloads the contents of a file if it has changed, by checking the last modified timestamp on the file every 0.2 seconds, then using the readText function in std.file to read in the file contents. It works pretty well, but every once in a while I get a The process cannot access the file because it is in use by another process error message. I guess this happens when my D program tries to read the file before the text editor manages to close its handle on the file. This would be fair enough if I was writing to the file in my D program, but I only want to read from it. Is this a bug or is there a better way to get file contents in D? While the text editor is writing the file reading it is a silly thing to do (no one knows what's there). I'm not familiar with windows but locking under Linux works as so. Any number or processes can have a read lock but if there is a write lock only the single process can access that file. Also isn't there something like inotify on windows? Polling sounds like the wrong solution.
Re: What was the reason for not including std.net.curl in the Windows phobos library?
On Jul 7, 2012 8:45 AM, Gary Willoughby d...@kalekold.net wrote: What was the reason for not including 'std.net.curl' in the Windows phobos library? IIRC it is licencing issues, they can't include curl in the distribution without certain requirements that were deemed to awkward to implement.
Re: floats default to NaN... why?
On Jun 7, 2012 9:53 PM, Minas minas_mina1...@hotmail.co.uk wrote: I agree that the default value for floats/doubles should be zero. It feels much more natural. I think the problem here is that people are thinking about some stuff too much. D is a rather new language that wants to be practical. Floats defaulting to NaN is NOT practical FOR MOST PEOPLE when at the same time I write: int sum; for(...) sum += blah blah blah And it works. Having floats deaulting to a value that's un-natural for most people is, in my opinion, craziness. Even if that's more correct in a mathematical sense. Please excuse my English. The idea isn't being practical exactly. The idea was to use invalid values as defaults. Unfortunately things like ints don't have invalid values, so they chose zero. The idea is to make people initialize their variables. It would have been better to pick 19472937 as the int default because not many people will use that value. The code you showed would be considered **bad** because you did not initialize your variables, however ints defaulting to zero is well defined so it isn't really a big deal. With floats there is this wonderful value that ensures that nothing reasonable comes out of a bad calculation, NaN. Therefore this is used as a default because if you forget to initialize your vars it will jump out at you. This is the thought that was used and many people don't agree. It is **very** unlikely to be changed now but __maybe__ D3 however far off that is. I hope not though, I hope ints default to 8472927 instead, but everyone has different opinions.
Re: Static function conflicts with Non-Static?!
On Jun 2, 2012 6:38 AM, bearophile bearophileh...@lycos.com wrote: Jonathan M Davis: Personally, I wish that it weren't legal to call a static function with an object and that you had to explicitly use the class, I agree. Bye, bearophile Same here, D 3.0?
Re: D under Linux Mint
On May 23, 2012 5:48 PM, snow marcel.patzw...@googlemail.com wrote:
Hello, Ive tried to install D under Linux and followed the steps
described on . this page http://dlang.org/dmd-linux.html . I
checked all folders after every step and everything is where it
should be. In the secound step I did both, adding dmd to the PATH
and copied the executables into the lib folder. If I type dmd
into the console, I get back all infos about D, so this is
already working. But if I try to run a simple Hello world program
like this:
import std.stdio;
void main() {
writeln(Hallo Welt);
}
I get the following error:
object.d: Error: module object is in file 'object.d' which cannot
be read
import path[0] = /usr/local/bin/../../src/phobos
import path[1] = /usr/local/bin/../../src/druntime/import
My DMD folder is in the home directory and the dmd.config
contains this:
[Environment]
DFLAGS=-I%@P%/../../src/phobos -I%@P%/../../src/druntime/import
-L-L%@P%/../lib64 -L-L%@P%/../lib32 -L--no-warn-search-mismatch
-L--export-dynamic
I already tried to compile the program with geany and the
console. In the console i trid to compile it as: dmd hello.d and
dmd -c hello.d. But everywhere I get the same errors
It appears that dmd can't find the library files. IIRC object.d is part of
the runtime. Check the paths in the error message and try to ensure
necessary files are found.
Re: How to make a directory?
On May 1, 2012 7:49 PM, Alex Rønne Petersen xtzgzo...@gmail.com wrote: Also, is there a way to require the root password of the user when going create the directory in a restricted folder (like /usr) AFTER the application has started? No idea, sorry. Thank you. -- - Alex You could execute a system command and change your apps privileges but this is a bad/risky way to do it. I would use sudo or gksudo and launch the command externally so that you don't grant your app root permissions and then do something stupid. If those actions are common I would only allow root to use your app.
Re: Aquivalent References as in C++?
On Apr 16, 2012 5:29 PM, Namespace rswhi...@googlemail.com wrote: That case I would like to prevent, but at the same time allow Ivalues. How does that work in D classes? As far as I know this operates with structs, but shouldn't it be possible with classes and objects too? I would recommend a precondition. It is a language enforced method of restricting what values may be passed into a function. If the code is compiled for release the checks are not included and do not cost anything.
Re: D 50% slower than C++. What I'm doing wrong?
On Apr 15, 2012 4:30 AM, Joseph Rushton Wakeling joseph.wakel...@webdrake.net wrote: ... the compiler accepts it. Whether that's because it's acceptably pure, or because the compiler just doesn't detect this case of impurity, is another matter. The int k is certainly mutable from outside the scope of the function, so AFAICS it _should_ be disallowed. As far as I understand pure includes the hidden this parameter so it is pure if when you call it on the same structure with the same arguments you always get the same results. Although that seams pretty useless in the optimization standpoint because the function can modify it's own object between calls.
Re: Creating a file in ~/.config (ubuntu)
Try using the $HOME environment variable.
Re: How to set up QTD?.
On Apr 8, 2012 10:59 PM, vmars316 vmars...@live.com wrote: Greetings, I would also like to try out QTD. So far, I have set things up this: C:\D\dmd2\QT I made a .batch file for both drcc.exe and duic.exe . duic.exe gave no feedback. drcc.exe gave the following feedback: C:\D\dmd2\QT\binECHO ON C:\D\dmd2\QT\bindrcc.exe Qt resource compiler Usage: drcc.exe [options] inputs Options: -o filewrite output to file rather than stdout -name name create an external initialization function with name -threshold level threshold to consider compressing files -compress levelcompress input files by level -root path prefix resource access path with root path -no-compress disable all compression -no-static-initialize disable automatic initialization of resources with prog ram start -binaryoutput a binary file for use as a dynamic resource -namespace turn off namespace macros -project Output a resource file containing all files from the current directory -version display version -help display this information C:\D\dmd2\QT\binREM C:\D\dmd2\windows\bin\dmd.exe C:\D\dmd2\QT\binpause Press any key to continue . . . Pls, do I need to re-do file/Folder placement? Also, do I need to create .bat files for every .d I want to compile? Can someone show me how to get qtd running? Thanks...Vernon I think rcc is the Qt resource compiler. I'm not at my computer at the moment to check, but if so it will translate xml resource files into D source.
Re: How to set up QTD?.
On Apr 9, 2012 12:09 PM, vmars316 vmars...@live.com wrote: On Monday, 9 April 2012 at 12:52:47 UTC, Kevin Cox wrote: I think rcc is the Qt resource compiler. I'm not at my computer at the moment to check, but if so it will translate xml resource files into D source. I think rcc is the Qt resource compiler. I don't know what the above means. What are its implications? Is my setup ok?: C:\D\dmd2\QT Or do I need to dump 'QT Folder' into 'drcc.exe Folder'? Also, do I need to create '*.bat' files for every '*.d' I want to edit/compile? Pls, what would that .bat file look like? Could someone show me a working cmd-line for the .bat file? Do I need to specify 'environmental-variables'? Thanks a lot for your helps...Vernon Qt as quite extensive documentation. Look into the documents about compiling projects. It is not a 1 to 1 translation but the workflow is the same.
Re: Latest versions of Entice Designer and DFL?
On Apr 8, 2012 4:49 PM, vmars316 vmars...@live.com wrote: Win7: Greetings, Ok, I got the command line for dmd2 running (Hello World). :) Now I would like to install a Visual GUI Builder. Not knowing any better, think I'll try Entice Designer and DFL. The most current versions I can find are for 2008. Are there more current versions? Url please. Is there a combined *.zip install for them? Also, is Entice Designer and DFL a reasonable choice? I am always oopen for a better option. Thanks...Vernon If you want to use QtD you can use QtDesigner and I think QtD has a moc for D. Worst case you can dynamically load the forum from the xml file QtDesigner spits out.
Re: GUI library
On Sun, Mar 25, 2012 at 11:13 AM, Jacob Carlborg d...@me.com wrote: On 2012-03-25 15:04, Tyro[17] wrote: Is there one available for use with D2 on MAC OS X? Thanks, Andrew * QtD - Bindings to Qt. Use the native drawing operations of the operating system (I think). Available on all platforms. Not sure if this is developed any more. I would reccomend Qt as well. You will get native cross-platform widgets with great performance. I am not sure how far QtD is but I know it once had a lot of development on it.
Re: Capturing caller's file/line number in variadic template functions
On Mar 16, 2012 2:29 PM, Adam D. Ruppe destructiona...@gmail.com wrote:
Put the string file = blaha in the template argument list,
before the variadic.
voic checkConsistency(string file = __FILE__, int line = __LINE__,
T...)(T t) {
But then you have to write it each time.
Re: Dumb question about git
When people say git encourages rewriting history. Don't listen. Once you have pushed your changes to the world they are immutable. This is because git uses cryptography internally and changing the history messes everything up. If you haven't pushed you can change all of your history and it will all be fine. But if someone else (github) has the old hisory bad things happen. If you are sure nobody has pulled from github you can use --force when pushing (I think). It will work no matter what but you will piss off people if they have pulled from you. Please note that this kind of history modifying is considered bad practice. On Mar 1, 2012 10:10 AM, H. S. Teoh hst...@quickfur.ath.cx wrote: OK, so I'm new to git, and I ran into this problem: - I forked druntime on github and made some changes in a branch - Pushed the changes to the fork - Pulled upstream commits to master - Merged master with branch - Ran git rebase master, so that my changes appear on top of the latest upstream master. - Tried to push branch to my fork, but now it complains that I have non-fast-forward changes and rejects the push. What's the right thing to do here? Looks like I screwed up my branch history. How do I fix it? Thanks! T -- Real Programmers use cat a.out.
Re: Dumb question about git
On Mar 1, 2012 12:15 PM, H. S. Teoh hst...@quickfur.ath.cx wrote: On Thu, Mar 01, 2012 at 10:22:33AM -0500, Kevin Cox wrote: When people say git encourages rewriting history. Don't listen. Once you have pushed your changes to the world they are immutable. This is because git uses cryptography internally and changing the history messes everything up. If you haven't pushed you can change all of your history and it will all be fine. But if someone else (github) has the old hisory bad things happen. If you are sure nobody has pulled from github you can use --force when pushing (I think). It will work no matter what but you will piss off people if they have pulled from you. Please note that this kind of history modifying is considered bad practice. [...] OK, so what's the right way to do it then? I have some changes in a branch, but master has been updated since, so I want to merge in the latest updates so that the branch changes are compatible with the latest code. If I just pull from master, then my changes get buried underneath the newest changes. I guess I still don't quite understand how things are supposed to work in situations like this. T -- Music critic: That's an imitation fugue! This time I would just --force. In the future the idea is to only push changes once you are happy with them. What I would do next time is: - work - commit - work - commit - pull - rebase (make what you have done look pretty) - push
Re: Trouble with -lib in linux undefined reference to `_Dmain'
I think you need the -lib in the linker command (too?). On Feb 29, 2012 12:25 PM, André an...@s-e-a-p.de wrote: Hi, I use Mono-D and have a hello world example which compiles fine. I set the compiler option -lib and receives an error undefined reference to `_Dmain'. Following commands are generated for the build process: dmd -c main.d -of/home/user/Dokumente/**MonoDevelop/HelloWorld/**HelloWorld/obj/Debug/main.o -I/usr/include/d/dmd/phobos -I/usr/include/d/dmd/**druntime/import -gc -debug -lib dmd -gc -debug -of/home/user/Dokumente/**MonoDevelop/HelloWorld/** HelloWorld/bin/Debug/**HelloWorld obj/Debug/main.o Do I miss an additional linux option or is the order of the commands wrong? Kind regards André
Re: UnitTest and visual D
I am having the same problem with visual d plugin for monodevelop. When I
compile from the command line the tests run.
A possibly related problem is that some files do not get recompiled when
changed unless I do a rebuild.
On Feb 23, 2012 8:38 PM, Jonathan M Davis jmdavisp...@gmx.com wrote:
On Friday, February 24, 2012 02:11:50 Chris Pons wrote:
I am following the book The D Programming Language and am at
the portion about functions and unittest. For some reason I
cannot get unittest to do anything noticeable.
If the unit tests pass, they don't print anything unless you add
statements to
them which do. You only get stuff being printed out on failure. This works
particularly well for the command line (it's normal in Unix-land for stuff
to
print nothing on success unless them printing stuff out is their job - this
makes it easier to pipe programs and the like). Some people complain about
it
from time to time, but that's the way it is. If you really want them to
print
something though, you can always add your own print statements.
If you compiled with -unittest, the unit tests run before main does, so if
all
of your tests pass, then your program will run normally after the unit
tests
have been run.
It's not uncommon for people to do something like this so that they can
have
the unit tests run without running their actual program:
version(unittest) void main() {}
else void main()
{
//Your normal main...
}
- Jonathan M Davis
Re: UnitTest and visual D
On Feb 23, 2012 9:41 PM, Jonathan M Davis jmdavisp...@gmx.com wrote There may very well be further problems due to what the IDE is doing (such as not doing a full recompile when you enable -unittest), but the unit tests won't print anything out on success regardless unless you use print statements in them It still doesn't run them when I do a full rebuild. In the build output I see -unittest in the command line. It is really weird. I haven't looked at it too closly. For now I am just compiling from the command line.
Re: D runtime Garbage Collector details
On Feb 23, 2012 6:50 PM, Vadim vadim.goryu...@gmail.com wrote: I am looking for the details on D Garbage Collection implementation. I will much appreciate if someone suggests the answers or give some links to existing documentation clarifying the following points: 1. Is it Mark-n-Sweep or copy or generational collector or simple reference counting? Or anything else? Any documentation on this would be very helpful 2. Sun/Oracle JVM publishes a number of counters in shared memory so that user may easily monitor the memory usage and the GC statistics real-time without affecting the application (and without modifying the application). Is there anything similar for D GC? 3. Is there any performance tests of D GC efficiency? Is it possible to write GC-predictable code (without manual allocate/free) or at least do something like System.gc There is quite a lot of info in the mailing list. Off of the top of my head I know it is a mark and sweep. There is someone who did their Phd on GC in D and he did a fairly good analysis of the current situation. And as the fellow before me said, there is a garbage collector control.
Re: Weird opEquals Problem
Oh, ok. First of all the docs appear somewhat misleading. I thought that function was an example on how to overload it. That could be clarified a little. Second of all, isn't that inefficient? And if you wanted to be able to compare to another type you don't control? I think it would make more sense to have it pick the best match much like other overloads. On Feb 22, 2012 9:05 PM, H. S. Teoh hst...@quickfur.ath.cx wrote: On Wed, Feb 22, 2012 at 08:51:50PM -0500, Kevin wrote: I have the following code which gives the same result on ldc2 and dmd. If I compare two objects of different classes I always get false even though the comparator is called. [...] The key thing to notice is that opEquals() gets called both times. Any ideas about what is happening? It's because when A and B are different types, the compiler translates A==B to: A.opEquals(B) B.opEquals(A) Both parties need to agree before they are considered equal. T -- Shin: (n.) A device for finding furniture in the dark.
Re: Let this() figure out T implicitly?
The error message is saying that you are trying to use Foo as a type but
Foo is not a type, it is a template for a type.
On Feb 17, 2012 7:20 AM, kraybourne st...@kraybourne.com wrote:
Hi!
This doesn't work:
import std.stdio;
class Foo(T)
{
T t;
this(T val)
{
t = val;
}
}
void main()
{
auto o = new Foo(5);
}
_
$ dmd foo
foo.d(13): Error: class foo.Foo(T) is used as a type
$ _
So I must
auto o = new Foo!(int)(5);
Then it compiles. Is it possible to have this() figure out the type some
way? (In this particular example it's perhaps not such a big deal. But
imagine a lot more args.)
(Side note: What _does_ that error message mean? I don't get it.)
thanks
/krbrn
Re: Let this() figure out T implicitly?
Yes. At least as the compiler would say. It's a little odd but I believe
that is how the D Nam mangling works. I personally just think of
Foo!(Class) as the type.
On Feb 17, 2012 8:05 AM, kraybourne st...@kraybourne.com wrote:
On 2/17/12 1:51 PM, Kevin Cox wrote:
The error message is saying that you are trying to use Foo as a type but
Foo is not a type, it is a template for a type.
Ah, so module.Foo is really not a class, but a template? I think I get it!
Thanks!
(Is then module.Foo(int).Foo the actual class type? I think I've seen
errors like that pop up...)
On Feb 17, 2012 7:20 AM, kraybourne st...@kraybourne.com
mailto:st...@kraybourne.com wrote:
Hi!
This doesn't work:
import std.stdio;
class Foo(T)
{
T t;
this(T val)
{
t = val;
}
}
void main()
{
auto o = new Foo(5);
}
_
$ dmd foo
foo.d(13): Error: class foo.Foo(T) is used as a type
$ _
So I must
auto o = new Foo!(int)(5);
Then it compiles. Is it possible to have this() figure out the type
some way? (In this particular example it's perhaps not such a big
deal. But imagine a lot more args.)
(Side note: What _does_ that error message mean? I don't get it.)
thanks
/krbrn
Re: Default Implementation For an Interface
I wasn't looking to implement meathods in the interface, I was looking to
have a default class that implements the interface that would be created if
you called `new Interface();` I don't think this is possible. and now that
I think about it I think that it is for a good reason.
On Fri, Feb 17, 2012 at 12:21 PM, Jacob Carlborg d...@me.com wrote:
On 2012-02-17 18:04, Steven Schveighoffer wrote:
On Wed, 15 Feb 2012 22:01:51 -0500, Kevin kevincox...@gmail.com wrote:
I was implementing a framework and I found that I wanted two things.
- A strong set of interfaces so that I can get what I want from a
variety of sources.
- Some basic implementations of these interfaces.
For example, say I was writing a database class. I could either name
the interface Database and call the class DatabaseImplementation or
something but that is ugly. If I call the interface IDatabase, the
Database class looks nice but I need to convince users to write
functions that take IDatabases not Databases.
I was wondering if there was any way to implement a default
implementation. This way, I could create my Database interface and
classes could implement that but if you called `new Database()` you
would still get a basic database.
Aside from what has been said already, if you wish to have methods that
are not static defined in the interface, final methods currently work:
interface I
{
void foo();
final void callFoo() {writeln(about to call foo); foo(); writeln(ok,
I called foo);}
}
This isn't exactly a default implementation, since you can't override
it.
But you could have one final method, the implementation and one virtual,
the one you would override. It's an idea, I don't know if it's a good one.
--
/Jacob Carlborg
