D-style mixins in C#
Not really about D, but it's nice to see C# feature (although not official, and some may call it even a hack) inspired by D :) http://blogs.jetbrains.com/dotnet/2012/08/resharper-sdk-adventures-part-5-%E2%80%94-d-style-mixins-in-c/ There's also a HN discussion: http://news.ycombinator.com/item?id=4455983
Re: [OT] Windows users: Are you happy with git?
On Friday, 18 May 2012 at 07:58:26 UTC, Lars T. Kyllingstad wrote: I remember back when we were considering whether to move DMD, Phobos and druntime from SVN on DSource to Git on GitHub, there were some concerns about using Git on Windows. People claimed that Git was a very Linux-centric tool, and that Windows support was buggy at best. Still, we made the switch, and I haven't really registered that many complaints since. So now I'm curious: Windows users, have you just resigned, or did Git actually turn out to work well on Windows? Specifically, is it usable from the CMD command line, and are graphical front-ends such as TortoiseGit any good? (I know running it through Cygwin works well, but that doesn't count.) -Lars I'm using both, Linux and Windows, but I prefer working on Windows (I don't have X on my Linux installation, and it's not very cozy to spend all day in console). On Windows I have MSYS + Console2 setup, so I basically have nice looking (and more importantly functional) Linux console on my Windows. Oh, and yes, git (msysgit actually) is working great on Windows (just a bit slower than Linux version, but still faster than svn).
Re: Do not write object file?
On Thursday, 17 May 2012 at 10:16:38 UTC, Andre Tampubolon wrote: Every time I compile a D code, an .obj file is generated. Is there any to prevent that? I tried dmd -o- hello.d. Indeed there's no obj file. And no executable, too. Maybe this is a bug? If you don't want object files to be generated (actually they must be generated in order for linker to build exe) compile with rdmd (it will put object files in a temp directory so your project folder is kept clean): rdmd --build-only (dmd parameter here) main.d also rdmd will take care of your dependencies so you just have to pass it your main file.
Re: What about x64 windows?
On Wednesday, 11 April 2012 at 12:45:08 UTC, Davita wrote: Hi guys. Is there a going development on x64 compiler for windows? Or D won't support x64 at all? Thanks As far as I know, optlink (linker used by dmd on windows) cannot output 64bit binaries, so until optlink gets upgraded (or until dmd switches to another linker, which I think all of us windows devs would really like to see) there will be no support for 64bit D applications on windows..
Re: Vote on std.regex (FReD)
Yes
Re: Proposal on improvement to deprecated
What about using an attribute for that?
deprecated(foo() is deprecated use bar()) void foo() {...}
@schedule deprecated(foo() is going to be deprecated as of -MM-DD, use
bar() instead) void foo() {...}
First form will behave like just it does now, with optional message
argument.
Second form would produce informational message instead of compile error
(with line number where that symbol is accessed from).
Both forms would print nothing when using -d switch.
In case unavailable is required, another attribute could be used for that:
@removed deprecated(foo() was removed as of -MM-DD, use bar()
instead.) void foo();
When @removed deprecated symbol is used compiler will abort with detailed
error message (line number where symbol is accessed from) even if -d switch
is used. This would be more convenient than just bailing out with message
undefined symbol foo() because we can use message parameter of deprecated
to direct user where to look for replacement.
Of course @schedule and @removed names are just an example..
Jonathan M Davis wrote in message
news:mailman.29.1317612078.22016.digitalmar...@puremagic.com...
On Sunday, October 02, 2011 07:06:36 Michel Fortin wrote:
On 2011-10-02 05:24:36 +, Jonathan M Davis jmdavisp...@gmx.com said:
deprecated(message, soft) void func1() {}
deprecated(message, hard) void func2() {}
This soft/hard thing is a little obscure, no one will understand what
it means by looking a it. Why not have separated 'deprecated' and
'unavailable' states?
We could just do
deprecated(message);
deprecated(message, full);
Full deprecation should be clear enough, I would think. And for
simplicity,
you just don't have any argument for partial deprecation.
- Jonathan M Davis
Re: Versioned extern?
Ouh, haven't read that you don't want code to be mixed-in.. In that
case.. I dunno :)
2011/7/29 Aleksandar Ružičić ruzicic.aleksan...@gmail.com:
If I'm not mistaken extern() accepts only Identifier, not expression.
I'm not really sure what's the best way to do that but I belive this
should work (haven't tested):
enum code = q{
void func() {
// do something
}
};
version (Windows) {
extern (Windows) {
mixin(code);
}
} else {
extern (C) {
mixin(code);
}
}
On Sun, Jul 24, 2011 at 5:35 AM, Nick Sabalausky a@a.a wrote:
Is there a way to have a section of code be extern(C) on one OS and
extern(Windows) on another OS, without resorting making the code in question
a mixin?
These doesn't appear to work:
--
version(Windows)
{
enum callingConvention = Windows;
}
else
{
enum callingConvention = C;
}
extern(mixin(callingConvention ))
{
/+ ...code here... +/
}
--
version(Windows)
{
extern(Windows):
}
else
{
extern(C):
}
/+ ...code here... +/
extern(D):
--
Re: ddoc patterns
On Fri, Apr 8, 2011 at 8:52 PM, spir denis.s...@gmail.com wrote: Right, but IIUC unlike pre there is no guarantee for code contents not to be interpreted further. It's a semantic hint to the rendering engine (which is often used to perform syntax highlighting). AFAIK no major browser (A-grade browser) does nothing more with code than making it have monospaced font (i.e. look at default styles for all elements in webkit: http://trac.webkit.org/browser/trunk/Source/WebCore/css/html.css, you'll see code only has it's font-family defined, while pre has few others more, most notably white-space: pre; and display: block). And no browser supports rendering syntax highlighting (as I know of) for any computer language (there are user scripts and maybe extensions which does that but in no way is that default behavior). It's true, code does have semantic hint, and that's hey anything between code and /code is a computer code!, which is I believe exact what you want - to display some code inline..
Re: ddoc patterns
On Fri, Apr 8, 2011 at 8:52 PM, spir denis.s...@gmail.com wrote: Yes: Macros: CODE = code$0/code That's really nice! I might take a look at ddoc and try to write some useful macros if it's expressive enough...
Re: std.string.indexOf with an optional start-at parameter?
On Mon, Apr 4, 2011 at 3:18 PM, Steven Schveighoffer
schvei...@yahoo.com wrote:
On Sun, 03 Apr 2011 14:24:33 -0400, spir denis.s...@gmail.com wrote:
Agreed this is a fairly standard param in other languages, but D easily
(and rather cheaply) allows
auto pos = indexOf(s[i..$], char);
That doesn't work, because it gets you the position in relation to s[i..$],
whereas you want the position in relation to s.
This works:
---
sizediff_t
indexOf(Char, T = sizediff_t)(in Char[] s, dchar c, T sp = 0)
if (isSomeChar!Char)
{
if (sp 0)
sp += s.length;
if (sp = 0 sp s.length)
{
auto i = indexOf(s[sp..$], c);
if (i -1)
return i + sp;
}
return -1;
}
---
And it doesn't require change of existing indexOf.
Re: Complete D grammar
On Mon, Apr 4, 2011 at 8:11 PM, Bruno Medeiros brunodomedeiros+spam@com.gmail wrote: BTW, I wanna thank for this work (current and upcoming), it is likely useful for other IDE projects as well ;) Ditto. I have started work on D language support for NetBeans (IMHO it's MUCH better editor than Eclipse) and started to write grammar for javaCC, but since there is ongoing work on ANTLR parser I'll wait for that to be done and integrate it into plugin I'm working on. :)
Re: New look feel for std.algorithm
This is much better than current style of documentation. But still I find D (phobos) documentation hard to read because there are dozens functions on one page. I think that's ok for reference documentation, but I think that for newcomers (myself included) is much easier to follow documentation in form of a manual where every function has it's own page with more than one example. Just like PHP Manual. I think their feature of user submitted comments/examples per each function is great. Ideally I would like to see both options, reference per module to quickly find a function I need (just like what we have now) and dedicated page for each function. I know that this cannot be made by it self and that some men/hours must be spent to make it happen, so I'm willing to offer my help to build this (I'm professional web developer, with a skill set of html\css\javascript\php\mysql and some basic photoshop know-how) if there is any chance this proposal be accepted. Regards, Aleksandar
Re: Complete D grammar
On Mon, Apr 4, 2011 at 9:05 PM, Steven Schveighoffer schvei...@yahoo.com wrote: On Mon, 04 Apr 2011 14:51:02 -0400, Aleksandar Ružičić ruzicic.aleksan...@gmail.com wrote: On Mon, Apr 4, 2011 at 8:11 PM, Bruno Medeiros brunodomedeiros+spam@com.gmail wrote: BTW, I wanna thank for this work (current and upcoming), it is likely useful for other IDE projects as well ;) Ditto. I have started work on D language support for NetBeans (IMHO it's MUCH better editor than Eclipse) and started to write grammar for javaCC, but since there is ongoing work on ANTLR parser I'll wait for that to be done and integrate it into plugin I'm working on. :) I would absolutely love NetBeans support for D. -Steve Me too, so when I realized that no such project exists I've decided to write it my self (after all I write Java for few year now so I feel comfortable with it) but I knew that writing parser will take me most time and effort so it's great to see someone decided to write parser/grammar for ANTLR which can be used by other projects (in that way few IDEs could share same parser and focus on other parts of an IDE).
Re: Complete D grammar
On Mon, Apr 4, 2011 at 8:58 PM, Andrei Alexandrescu seewebsiteforem...@erdani.org wrote: Aleksandar, would you be willing to work with the student working on ANTLR as a mentor? Please let me know and I'll send details about applying as a mentor. Well, I'm also a student :) So I'm not sure if I really can be a mentor (23yrs old), and I have never worked with ANTLR before but language theory (grammars, parsers and all that stuff) was always my favorite subject so I know a bit about all that. I'm willing to help in any way I can..
std.string.indexOf with an optional start-at parameter?
I needed std.string.indexOf to accept start position in the string to start the search at. I was really surprised when I realized that this (to me) standard parameter is missing (I'm used to indexOf in javascript, strpos in php and equivalent methods in other languages, which support start offset parameter). There might be some other function (in some other module) that does what I want but I wasn't able to find it (I find D's documentation not easy to search and read), so I've copied indexOf to my module and added wanted functionality: https://gist.github.com/900589 now, I'm able to write, for example: auto pos = indexOf(haystack, '$', 10); // will starts search at 11th char in haystack and auto pos = indexOf(haystack, '$', -5); // will starts search at 5th char from the end My question is: is there a reason why there is no this functionality in phobos (maybe there's some language feature I'm not aware of?) and if no such reason exists, would it be possible to add it in future version of phobos/dmd?
Re: std.string.indexOf with an optional start-at parameter?
I thought first of slicing, but isn't that making a copy of string? And also, if I'm not mistaken if you slice out of range bounds (i.e. haystack[5..$] when haystack.length 5) you'll get exception, right? That's why I think this would be nice to have feature, so you don't have to worry if start position is within the string bounds, and you won't need to write this: auto pos = indexOf(haystack[$-5..$], '$') + haystack.length-5; when you want to start search from the end (since it's somehow less readable than indexOf(haystack, '$', -5)). On Sun, Apr 3, 2011 at 7:55 PM, Robert Jacques sandf...@jhu.edu wrote: On Sun, 03 Apr 2011 13:39:40 -0400, Aleksandar Ružičić ruzicic.aleksan...@gmail.com wrote: I needed std.string.indexOf to accept start position in the string to start the search at. I was really surprised when I realized that this (to me) standard parameter is missing (I'm used to indexOf in javascript, strpos in php and equivalent methods in other languages, which support start offset parameter). There might be some other function (in some other module) that does what I want but I wasn't able to find it (I find D's documentation not easy to search and read), so I've copied indexOf to my module and added wanted functionality: https://gist.github.com/900589 now, I'm able to write, for example: auto pos = indexOf(haystack, '$', 10); // will starts search at 11th char in haystack auto pos = indexOf(haystack[10..$], '$') + 10; and auto pos = indexOf(haystack, '$', -5); // will starts search at 5th char from the end auto pos = indexOf(haystack[$-5..$], '$') + haystack.length-5; My question is: is there a reason why there is no this functionality in phobos (maybe there's some language feature I'm not aware of?) and if no such reason exists, would it be possible to add it in future version of phobos/dmd? Yes, the language feature is called slicing. See above. Also, you may want to look at the various find methods in std.algorithm. Generally, it's better to work with ranges/slices than indexes due to UTF's encoding scheme.
Re: std.string.indexOf with an optional start-at parameter?
On Sun, Apr 3, 2011 at 8:16 PM, Andrei Alexandrescu seewebsiteforem...@erdani.org wrote: It's not. Seems I've missed that in the docs, I tought it will always make a copy :) I think that's a natural and simple improvement of indexOf. The one aspect that I'm unsure about is starting from the end for negative indices. Negative indices might seem a bit odd but it's standard in other languages (like javascript and php which I've already mentioned). I would even like to see this in D: array[-2]; // get 'a' from foobar same for slicing: array[-4..2]; // get ob from foobar Could you please submit an enhancement request to bugzilla? sure!
Forking phobos
I want to fork Phobos and hack a bit on it (maybe even submit some pull requests, someday), but I'm having trouble compiling it (on windows). This is what I've done: - forked phobos on github - cloned the fork to my machine - run make -f win32.mak and make complained that it can't make druntime lib. So I've cloned druntime in same directory where i have phobos (so I now have phobos and druntime directories on same level), Did make -f win32.mak clean and tried make again, but it still complains about druntime: cd ..\..\.. Error: don't know how to make '..\druntime\lib\druntime.lib' What I'm I doing wrong? Am I missing some more components? I just want to be able to edit phobos source, compile it to phobos.lib and link it to my d program. I have DMC, DMD and LINK on PATH, that's not the issue... Thanks, Aleksandar
Re: std.string.indexOf with an optional start-at parameter?
You mean Python and Ruby. - Javascript does not support negative index. In fact, JS has no true arrays, it only has associative array. - PHP does not support negative index. http://ideone.com/8MZ2T I was talking about javascript's String.prototype.indexOf () and php's strpos functions, not about array indexing. But even for that I wasn't correct :/. Negative start-at index is avaliable for substr (both, in php and js), that's why I have confused it with indexOf (I thought these things are consistent..) And javascript _does_ have true arrays, but it _doesn't_ have true associative arrays (those are object literals). This does not mean negative index is useless (I use it all the time when programming in Python), but D shouldn't add a feature just because other languages have it, or even you think that language had it. I know, I was just expressing my opinion (what I would like to see in a language, I never programmed in phyton or perl, so I was thinking that negative indices for array indexing are not supported in any language that I know of), I wasn't proposing a new feature :)
Re: std.string.indexOf with an optional start-at parameter?
On Sun, Apr 3, 2011 at 10:56 PM, KennyTM~ kenn...@gmail.com wrote:
And javascript _does_ have true arrays, but it _doesn't_ have true
associative arrays (those are object literals).
I would not call it a true array if it is indexed by string internally.
Anyway, this is not the main point.
You're right that JS arrays are not a point here, but I must again
disagree with you :)
I write Javascript code for living, so I think I know what I'm talking about:
var a = [foo, bar, baz]; // defining an array
a[0];// foo
a[0]; // this would also work, but only because JS casts 0 to
integer implicitly
there is no string indexing with arrays, only with objects
(associative arrays, maps, call it as you like):
var o = {foo: bar, 0: baz}; // defining an object (a.k.a AA)
o.foo; // bar
o[foo]; // same, returns bar
o[0]; // baz now, this just looks like indexing an array,
but it really ain't, it's property getter, but JS allows you have
numeric properties so it can be confusing, I admit.
That's all I have to say about JS arrays, won't be talking non-D anymore :)
Regards,
Aleksandar
Re: Forking phobos
Thanks! I've changed sc.ini, built druntime and then phobos successfully. Now, I'm able to build phobos.lib but when I try to compile simple hello world program and link it to that phobos.lib OPTLINK greets me with this: C:\dmd hello.d OPTLINK (R) for Win32 Release 8.00.8 Copyright (C) Digital Mars 1989-2010 All rights reserved. http://www.digitalmars.com/ctg/optlink.html C:\Users\Aleksandar\Dropbox\Projects\phobos\phobos.lib(lifetime) Error 42: Symbol Undefined _D4core5bitop3bsrFNaNbkZi C:\Users\Aleksandar\Dropbox\Projects\phobos\phobos.lib(gcx) Error 42: Symbol Undefined _D4core5bitop3bsfFNaNbkZi C:\Users\Aleksandar\Dropbox\Projects\phobos\phobos.lib(gcx) Error 42: Symbol Undefined _D4core5bitop3btsFNbPkkZi C:\Users\Aleksandar\Dropbox\Projects\phobos\phobos.lib(gcx) Error 42: Symbol Undefined _D4core5bitop3btrFNbPkkZi --- errorlevel 4 this is my sc.ini: [Version] version=7.51 Build 020 [Environment] LIB=C:\Users\Aleksandar\Dropbox\Projects\druntime\lib;C:\Users\Aleksandar\Dropbox\Projects\phobos\;C:\bin\dmd2\windows\lib;C:\bin\dm\lib DFLAGS=-IC:\Users\Aleksandar\Dropbox\Projects\phobos\;C:\Users\Aleksandar\Dropbox\Projects\druntime\import LINKCMD=%@P%\link.exe Also, when i do make -f win32.mak unittest I get the same error: --- std.socket(316) broken test --- --- std.regex(3443) broken test --- OPTLINK (R) for Win32 Release 8.00.8 Copyright (C) Digital Mars 1989-2010 All rights reserved. http://www.digitalmars.com/ctg/optlink.html unittest.obj(unittest) Error 42: Symbol Undefined _D4core5bitop3bsrFNaNbkZi ..\druntime\lib\druntime.lib(gcx) Error 42: Symbol Undefined _D4core5bitop3bsfFNaNbkZi ..\druntime\lib\druntime.lib(gcx) Error 42: Symbol Undefined _D4core5bitop3btsFNbPkkZi ..\druntime\lib\druntime.lib(gcx) Error 42: Symbol Undefined _D4core5bitop3btrFNbPkkZi --- errorlevel 4 (plus 2 broken tests) Do I need latest DMD from github? On Sun, Apr 3, 2011 at 11:30 PM, Jonathan M Davis jmdavisp...@gmx.com wrote: On 2011-04-03 12:48, Aleksandar Ružičić wrote: I want to fork Phobos and hack a bit on it (maybe even submit some pull requests, someday), but I'm having trouble compiling it (on windows). This is what I've done: - forked phobos on github - cloned the fork to my machine - run make -f win32.mak and make complained that it can't make druntime lib. So I've cloned druntime in same directory where i have phobos (so I now have phobos and druntime directories on same level), Did make -f win32.mak clean and tried make again, but it still complains about druntime: cd ..\..\.. Error: don't know how to make '..\druntime\lib\druntime.lib' What I'm I doing wrong? Am I missing some more components? I just want to be able to edit phobos source, compile it to phobos.lib and link it to my d program. I have DMC, DMD and LINK on PATH, that's not the issue... I believe that these are the correct steps: 1. Make sure that druntime and phobos were both put at the same directory level. e.g. I have C:/github/druntime and C:/github/phobos. 2. Adjust your sc.ini accordingly. e.g. Mine is = [Version] version=7.51 Build 020 [Environment] LIB=c:\github\druntime\lib;c:\github\phobos\;c:\dmd2\windows\lib;c: \dm\lib DFLAGS=-Ic:\github\phobos\;c:\github\druntime\import LINKCMD=%@P%\link.exe = 3. Build druntime by running make -f win32.mak in the druntime directory. 4. Build Phobos by running make -f win32.mak in the phobos directory. - Jonathan M Davis
Re: Is the world coming to an end?
Nice to see awkward octal literal syntax being removed from Phobos! :) On Sat, Apr 2, 2011 at 10:16 PM, Andrej Mitrovic n...@none.none wrote: https://github.com/D-Programming-Language/phobos/commit/83f99df573c089cc186ef370cb691c2f8a25c873 https://github.com/D-Programming-Language/phobos/commit/88904f7795a94b23e750e10a2addc90783089de7 If I didn't know it better I would think it's still April 1st. :D
Re: Asynchronicity in D
I really like design of node.js (http://nodejs.org) it's internally
based on libev and everything runs in a single-threaded event loop.
It's proven to be highly concurrent and memory efficient.
Maybe a wrapper around libev(ent) for D ala node.js would be good
solution for asynchronous API, other than thread approach (I always
like to have more than one option and choose one which suits better
for concrete task I'm dealing with).
Whatever solution to be chosen I'd like to have an API like this:
readTextAsync(filename, (string contents) {
// do something with contents
});
Re: Asynchronicity in D
I really like design of node.js (http://nodejs.org) it's internally
based on libev and everything runs in a single-threaded event loop.
It's proven to be highly concurrent and memory efficient.
Maybe a wrapper around libev(ent) for D ala node.js would be good
solution for asynchronous API, other than thread approach (I always
like to have more than one option and choose one which suits better
for concrete task I'm dealing with).
Whatever solution to be chosen I'd like to have an API like this:
readTextAsync(filename, (string contents) {
// do something with contents
});
On Thu, Mar 31, 2011 at 2:04 PM, Piotr Szturmaj bncr...@jadamspam.pl wrote:
Max Klyga wrote:
I've been thinking on things I can change in my GSoC proposal to make it
stronger and noticed that currently Phobos does not address asynchronous
I/O of any kind.
A number of threads on thid newsgroup mentioned about this problem or
shown ways other languages address asynchronicity.
I want to ask D community about plans on asynchronicity in Phobos.
Did somenone in Phobos team thought about possible design?
How does asynchronicity stacks with ranges?
What model should D adapt?
etc.
Yes, asynchronous networking API would be more scalable. If you're
collecting information about async IO, please take a look at libevent and
libev, also NT's completion ports, FreeBSD's kqueue and Linux epoll.
Protocols implemented using event-driven APIs should scale to thousands of
connections using few working threads. Moreover async protocols could be
wrapped to be synchronous (but not other way around) and used just like well
known blocking API's.
Basically, while using async IO, you request some data to be written and
then wait for completion event (usually by callback function). Then you
request some allocated buffer to be read and then you wait until network
stack fills it up. You do not wait for blocking operation like with using
send() or recv(), instead you may do some useful processing between events.
Re: Using opDispatch as *magic* getter/setter. Possible or not?
On Thu, Mar 31, 2011 at 8:52 AM, Jacob Carlborg d...@me.com wrote:
Or, I think this will work as well:
@property ref ConfigSection opDispatch(string sectionName, Args ...)(Args
args) if (Args.length == 0)
{
// getter
}
@property ref ConfigSection opDispatch(string sectionName, Args ...)(Args
args) if (Args.length == 1)
{
// setter
}
}
auto foo = new Foo;
foo.bar; // works
foo.bar = 3; // currently does not work, bug
foo.bar(3); // works
--
/Jacob Carlborg
That's great! Thanks! If just the assignment worked thought, it would
be perfect..
Btw, do you know which issue # that is? I'd like to read more about
that bug but can't find it on bugzilla.
On Thu, Mar 31, 2011 at 3:50 AM, spir denis.s...@gmail.com wrote:
Agreed. And I would really have an answer to your question, since I tried to
do the same thing. Don't understand why D does not have an 'opMember' or
'opDot'. Someone knows?
This would be one of the first metamethods I would introduce in a language
(definitely before operator overloading).
Yeah, opMember would be great, but it seems that we'll be able to use
opDispatch for that in a way Jacob described once the bugs are ironed
out..
But until then I'll have to live with ugly indexing sytnax...
Re: Using opDispatch as *magic* getter/setter. Possible or not?
On Thu, Mar 31, 2011 at 1:30 PM, Steven Schveighoffer
schvei...@yahoo.com wrote:
or you can change the template parameters in the opDispatch setter:
@property ref ConfigSection opDispatch(string sectionName, T : string)(T
arg)
-Steve
Thanks, that's much more readable I now have these templates:
// getter
@property ref ConfigEntry opDispatch(string entryName)() pure {
if (!(entryName in entries)) {
entries[entryName] = new ConfigEntry(config);
}
return entries[entryName];
}
// setter
@property void opDispatch(string entryName, T : string)(in T value) {
if (!(entryName in entries)) {
entries[entryName] = new ConfigEntry(config);
}
entries[entryName] = value;
}
And that compiles just fine (I dunno if it runs ok since I'm currently
on windows and I've been messing with my setup so optlink can't stop
complaining.. sigh..)
but due to bug not allowing foo.bar = abc; I've also added opIndex
and opIndexAssign (apparently you cannot only have opIndexAssign
defined) as temporary backup solution..
Non-Virtual Interfaces
I'm trying to use NVI idiom but i keep getting errors from dmd.
This is my setup:
module test;
import std.stdio;
interface IBase {
void foo();
void bar();
}
interface IBar : IBase {
final void bar() {
writefln(IBar.bar());
}
}
class Foo : IBar {
void foo() {
writefln(Foo.foo());
}
}
void main() {
Foo foo = new Foo();
foo.foo();
}
When I try to compile it i get test.d(16): Error: class test.Foo
interface function IBar.bar isn't implemented
And if I try to define bar() in Foo i receive test.d(22): Error:
function test.Foo.bar cannot override final function
IBar.test.IBar.bar
which is expected since IBar.bar() is final.
So, am I missing some point about NVIs here or is it just not yet
implemented in dmd?
Re: Non-Virtual Interfaces
What you may want to consider is an abstract class instead of NVI, as long as you don't need multiple inheritance, it should be fine. -Steve Well, I've decided to give NVI a try just because multiple inheritance would be best way to do what I want (aldo I hate that feature of C++ and just don't use it) but it seems I can't do it with a NVI either... So back to the drawing board for me :) thanks for reply - Aleksandar
Re: Non-Virtual Interfaces
In D, the public function would have to be final to make it non-virtual/non-
overridable, and the function it calls would have to be protected, since you
can't override private functions (
http://d.puremagic.com/issues/show_bug.cgi?id=4542 ). In this case, you're
trying to override final functions, which doens't work at all.
Well I don't try to override final function, I know it cannot be done :)
I've just tried to override bar() in Foo when compiler told me that I
don't have that function implemented and I received message that it
cannot be overriden, as I've expected..
However, if you're not trying to do anything other than call the implemented
function (you're certainly not here), then there's no point to NVI. Just use a
normal, public interface function or make the base class of your class
abstract
and put the function's declaration there.
- Jonathan M Davis
That was just an example, what was my goal was is to have setup like this:
interface IEvent {
EventType type();
}
interface IEventListener {
void handle(IEvent event);
}
class MyEvent : IEvent {
this(bool flag) {
this.flag = flag;
}
EventType type() {
return EventType.MyEvent;
}
bool isFlag() {
return flag;
}
private:
bool flag;
}
interface IMyEventListener : IEventListener {
void onFlag(MyEvent event);
void onNotFlag(MyEvent event);
final void handle(IEvent event) {
MyEvent e = cast(MyEvent) event;
if (e !is null) {
if (e.isFlag()) {
onFlag(e);
} else {
onNotFlag(e);
}
}
}
}
which would allow me to have a class that can listen for different
events at the same time, but it seems that to be able to do that I'd
have to move handling routine into the event class..
std.algorithm.remove using SwapStrategy.unstable doesn't works
I'm trying to use remove() from std.algorithm to remove item from an
array and when I tried to use SwapStrategy.unstable (as I don't need
to maintain order of items in array and I want to optimize where ever
I can) I came to surprising results. In the example below one would
expect that item at index 2 (number 3 in example) will be removed but
instead item at index 0 is removed from array.
Is this a bug or I'm missing a point?
-
import std.stdio, std.algorithm;
void main(string[] args) {
auto a = [1,2,3,4];
foreach (e; a) writef(%s , e); writefln((%s), a.length); // 1 2 3 4
(4)
auto i = a.indexOf(3);
writefln(%s, i); // 2
if (i -1) {
a = remove!(SwapStrategy.unstable)(a, i);
}
foreach (e; a) writef(%s , e); writefln((%s), a.length); // 4 2 3
(3) !?!
}
-
thx in advance,
Aleksandar
Re: std.algorithm.remove using SwapStrategy.unstable doesn't works
No problem, just to isolate the code and to confirm it's not something
to other parts of my code (but I'm pretty sure it's not).
On Tue, Nov 16, 2010 at 7:03 PM, Andrei Alexandrescu
seewebsiteforem...@erdani.org wrote:
On 11/16/10 4:24 AM, Aleksandar Ružičić wrote:
I'm trying to use remove() from std.algorithm to remove item from an
array and when I tried to use SwapStrategy.unstable (as I don't need
to maintain order of items in array and I want to optimize where ever
I can) I came to surprising results. In the example below one would
expect that item at index 2 (number 3 in example) will be removed but
instead item at index 0 is removed from array.
Is this a bug or I'm missing a point?
-
import std.stdio, std.algorithm;
void main(string[] args) {
auto a = [1,2,3,4];
foreach (e; a) writef(%s , e); writefln((%s), a.length); // 1 2
3 4 (4)
auto i = a.indexOf(3);
writefln(%s, i); // 2
if (i -1) {
a = remove!(SwapStrategy.unstable)(a, i);
}
foreach (e; a) writef(%s , e); writefln((%s), a.length); // 4 2
3 (3) !?!
}
-
thx in advance,
Aleksandar
Looks like a bug. Could you please file it to bugzilla?
Thanks,
Andrei
Re: std.algorithm.remove using SwapStrategy.unstable doesn't works
filed as Issue #5224 - http://d.puremagic.com/issues/show_bug.cgi?id=5224
regards,
Aleksandar
2010/11/16 Aleksandar Ružičić ruzicic.aleksan...@gmail.com:
No problem, just to isolate the code and to confirm it's not something
to other parts of my code (but I'm pretty sure it's not).
On Tue, Nov 16, 2010 at 7:03 PM, Andrei Alexandrescu
seewebsiteforem...@erdani.org wrote:
On 11/16/10 4:24 AM, Aleksandar Ružičić wrote:
I'm trying to use remove() from std.algorithm to remove item from an
array and when I tried to use SwapStrategy.unstable (as I don't need
to maintain order of items in array and I want to optimize where ever
I can) I came to surprising results. In the example below one would
expect that item at index 2 (number 3 in example) will be removed but
instead item at index 0 is removed from array.
Is this a bug or I'm missing a point?
-
import std.stdio, std.algorithm;
void main(string[] args) {
auto a = [1,2,3,4];
foreach (e; a) writef(%s , e); writefln((%s), a.length); // 1 2
3 4 (4)
auto i = a.indexOf(3);
writefln(%s, i); // 2
if (i -1) {
a = remove!(SwapStrategy.unstable)(a, i);
}
foreach (e; a) writef(%s , e); writefln((%s), a.length); // 4 2
3 (3) !?!
}
-
thx in advance,
Aleksandar
Looks like a bug. Could you please file it to bugzilla?
Thanks,
Andrei
