Re: GUI library for DMD 2.090 or DMD 2.091
On Monday, 27 April 2020 at 11:27:57 UTC, Paulo Pinto wrote: On Sunday, 26 April 2020 at 09:09:04 UTC, Antonio Corbi wrote: On Saturday, 25 April 2020 at 09:30:44 UTC, Paulo Pinto wrote: On Friday, 24 April 2020 at 18:52:55 UTC, Russel Winder wrote: [...] Just curious, how do you handle the whole RC> story in Gtk-rs? For me it made the point that languages with tracing GC or implicit reference counting are much better solution for doing GUI programming. Hi Paulo, I don't know if you are referring to the `clone!` macro described here[1] [1] https://gtk-rs.org/blog/2019/12/15/new-release.html Antonio Hi, this macro is new to me, it did not exist when I tried to have a go at Gtk-rs, so it simplifies not having to write such boilerplate ourselves, but like the author mentions it doesn't make it go away, it just gets hidden behind the macro. Hi, Yes, previously this macro lived (in a simplified form, i.e. no @strong) in the examples provided by the gtk-rs developers. Now it's part of the gtk-rs bindings. Antonio
Re: GUI library for DMD 2.090 or DMD 2.091
On Saturday, 25 April 2020 at 09:30:44 UTC, Paulo Pinto wrote: On Friday, 24 April 2020 at 18:52:55 UTC, Russel Winder wrote: [...] Just curious, how do you handle the whole RC> story in Gtk-rs? For me it made the point that languages with tracing GC or implicit reference counting are much better solution for doing GUI programming. Hi Paulo, I don't know if you are referring to the `clone!` macro described here[1] [1] https://gtk-rs.org/blog/2019/12/15/new-release.html Antonio
Re: Blog Post #0099: A Special Request
On Thursday, 23 January 2020 at 12:29:11 UTC, Ron Tarrant wrote: On Thursday, 23 January 2020 at 08:33:39 UTC, Antonio Corbi wrote: https://gitlab.com/amcorbi/dmaurerrose I think this is somewhat related to what te OP was asking for. I'm confused. I was the OP, so I'm not sure who you're referring to. Ooops, sorry, my bad! Assuming you are on GNU/Linux, a simple 'dub run' is all you have to do to make it compile and run. On Windows, `dub run` yielded the following output: Performing "debug" build using C:\D\dmd2\windows\bin\dmd.exe for x86_64. gtk-d:gtkd 3.9.0: target for configuration "library" is up to date. gtk-d:gstreamer 3.9.0: target for configuration "library" is up to date. gtk-d:peas 3.9.0: target for configuration "library" is up to date. gtk-d:sv 3.9.0: target for configuration "library" is up to date. gtk-d:vte 3.9.0: target for configuration "library" is up to date. maurerrose-d ~master: building configuration "application"... Running pre-build commands... source/constants.d.in was unexpected at this time. Command failed with exit code 1: if [ source/constants.d.in -nt source/constants.d ]; then sed -e 's#topdir#D:\temp\dmaurerrose-master#' source/constants.d.in > source/constants.d; fi Yes, it uses 'sed' to get 'constants.d' from 'constants.d.in' at configuration time. So you can write your own 'constants.d' with the appropiate values for UIDIR and DATADIR and delete/comment the the preBuildCommands in dub.sdl. Hope this helps. Antonio
Re: Blog Post #0099: A Special Request
On Wednesday, 22 January 2020 at 21:22:57 UTC, Ron Tarrant wrote: On Tuesday, 21 January 2020 at 22:12:10 UTC, Antonio Corbi wrote: On Tuesday, 21 January 2020 at 22:06:30 UTC, Ron Tarrant wrote: Do you still have the Maurer Rose example? I had to look this up. I'd never heard of it before. That being said... Do you think it could fit this kind of example? When I say "demo" I'm talking about examples of how to do various GTK GUI stuff rather than mathematical exercises. Trying to do this mathematical/drawing exercise, I'd be waaay out of my element. The few simple math/draw examples I did in Cairo (posts #0057 to #0064) is about my limit as far as math goes. However, I can point you at this repository of Java examples: https://github.com/iabin/Maurer-Rose/tree/master/src Using the methods outlined in the posts I've listed, you should be able to port it over from Java to D. I'm not a mathematician, so I wouldn't be of much help. I wish you the best of luck on this endeavour. I was referring to this example I made some time ago: https://gitlab.com/amcorbi/dmaurerrose I think this is somewhat related to what te OP was asking for. Assuming you are on GNU/Linux, a simple 'dub run' is all you have to do to make it compile and run. Antonio
Re: Blog Post #0099: A Special Request
On Tuesday, 21 January 2020 at 22:06:30 UTC, Ron Tarrant wrote: On Tuesday, 21 January 2020 at 18:57:47 UTC, Jan Hönig wrote: I would also like to request a future blog post about animation. I know you have done that in the past, but i am thinking of some animation triggered by user input (say a button, or some text field, which provides parameters for a circle). Just to make sure I know exactly what you want... - the user inputs parameters for a circle - I'm assuming size, position, perhaps the fraction of the circle (half, quarter, two-thirds, whatever) - the user then clicks a button and that draws the circle. Is that more or less what you're after? Hi Ron! Do you still have the Maurer Rose example? Do you think it could fit this kind of example? Antonio
Re: Unexpected aliasing
On Monday, 11 November 2019 at 19:17:37 UTC, Bastiaan Veelo wrote:
Recently I got my first surprise with our use of D. The symptom
was that two local variables in two different functions
appeared to be sharing data.
A simplified example is shown below (the original was machine
translated from Pascal and involved templates and various
levels of indirection). What I did not know is that the initial
value of struct members is a compile time feature, apparently.
What I suspect is happening is that the array lives in the
static data segment (or is created in the module constructor?)
and that the slices inside arr1 and arr2 get initialised to
point to that same array.
I could use some help in rewriting the code below so that arr1
and arr2 each have their own data; ideally with minimal changes
so that I can make the transcompiler do the right thing.
Thanks!
Bastiaan.
void main()
{
import std.stdio;
WrapIntegerArray arr1;
arr1[0] = 42;
WrapIntegerArray arr2;
writeln(arr2[0]); // 42, not 0.
writeln("arr1.wrap.arr.ptr = ", arr1.wrap.arr.ptr);
writeln("arr2.wrap.arr.ptr = ", arr2.wrap.arr.ptr); //
identical
assert(arr2[0] == 0); // fails
}
struct IntegerArray
{
int[] arr;
alias arr this;
this(int l)
{
arr = new int[l];
}
}
struct WrapIntegerArray
{
auto wrap = IntegerArray(5); // This is CTFE! :-(
alias wrap this;
}
Defining and using a constructor for WrapIntegerArray seems to
work:
void main()
{
import std.stdio;
WrapIntegerArray arr1 = WrapIntegerArray(5);
arr1[0] = 42;
WrapIntegerArray arr2 = WrapIntegerArray(5);
writeln(arr2[0]); // 42, not 0.
writeln("arr1.wrap.arr.ptr = ", arr1.wrap.arr.ptr);
writeln("arr2.wrap.arr.ptr = ", arr2.wrap.arr.ptr); // identical
assert(arr2[0] == 0); // fails
}
struct IntegerArray
{
int[] arr;
alias arr this;
this(int l)
{
arr = new int[l];
}
}
struct WrapIntegerArray
{
this (int v) {
wrap = IntegerArray(5);
}
IntegerArray wrap;
alias wrap this;
}
Hope this helps.
Antonio
Re: Blog Post #79: Notebook, Part III - Customized Tabs, Part I
On Tuesday, 15 October 2019 at 22:02:35 UTC, WebFreak001 wrote:
On Tuesday, 15 October 2019 at 20:03:00 UTC, Ron Tarrant wrote:
...
Do you have links for these?
thanks! :p
both the packages can simply be found on dub:
https://code.dlang.org/search?q=glade
Not sure if there are other ways like directly loading an XML
in GTK, haven't looked into it too much yet because I am not so
often building GTK GUI applications, but with the new Linux
Phones on the market (Librem 5, PinePhone) running GTK Apps
natively and really needing some Apps those will be great
platforms to start app development on.
Hi WebFreak001, Ron:
There's no need to generate code from glade files.
You can load at runtime the XML file that glade generates.
You have to create an instance of the Gtk.Builder class[1], and
supply it
the XML file, i.e. from the file that you saved from glade[2] and
after that you 'load' your UI controls into your program
variables using getObject[3], a small snippet of this pattern:
---
auto builder = new Builder();
if(!builder.addFromFile(buildPath(pkgdatadir,"ui/MainWindow.ui")))
{
writeln("Window ui-file cannot be found");
return;
}
HeaderBar headerBar = cast(HeaderBar)
builder.getObject("headerBar");
Box windowContent = cast(Box)
builder.getObject("windowContent");
...
---
Once I wrote this extremely simple class to simplify Builder
usage:
---
module gtagui.uibuilder;
private import gobject.ObjectG;
import gtk.Builder;
class UiBuilder : Builder {
this (string uif) {
if (!addFromFile (uif))
throw new Exception ("File not found: " ~ uif);
}
public T getObject(T) (string name) {
return (cast(T) super.getObject (name));
}
}
---
So you can now write things like this:
---
public void loadUiFrom (string uifile) {
uib = new UiBuilder (uifile);
topbox = uib.getObject!Box ("box1");
theCanvas = uib.getObject!DrawingArea("imgwindow");
assert (theCanvas !is null);
---
Hope this helps.
Antonio
[1] https://api.gtkd.org/gtk.Builder.Builder.html
[2] https://api.gtkd.org/gtk.Builder.Builder.addFromFile.html
[3] https://api.gtkd.org/gtk.Builder.Builder.getObject.html
Re: Abstract classes vs interfaces, casting from void*
On Saturday, 10 August 2019 at 08:20:46 UTC, John Colvin wrote: On Friday, 9 August 2019 at 13:39:53 UTC, Simen Kjærås wrote: Thanks for the extra detail. Is there a solid reason to ever use an interface over an abstract class? (Other than multiple inheritance). I'm such a noob at anything related to OO. Hi John. One reason could be data. Abstract classes can hold data, interfaces can't. Antonio
Re: Linux & DMD & GtkD
On Saturday, 16 February 2019 at 16:28:09 UTC, Ron Tarrant wrote:
On Saturday, 16 February 2019 at 14:29:56 UTC, Russel Winder
wrote:
Pass, sorry.
Thanks for the replies, guys...
I quoted the above line because it's just about the only thing
I understood. Let me explain...
It's been almost 20 years since I used Linux and my notes are
long gone. A ton of things have changed. Like, for instance, it
found all my hardware this time, without me getting involved.
But also the software installation managers and lots of other
things are completely unrecognizable. On top of that, my brain
has (unfortunately) been molded into the Windows/Microsoft way
of thinking.
I guess what I'm hoping for is a step-by-step,
full-on-hand-holding, large-print with pictures tutorial for
how to get GtkD and (I guess) dub working. I know the stuff you
wrote is probably helpful, but I'm not well-enough versed in
Linux or any flavour of UNIX ATM to understand it, pick which
option I should use, and to put these commands in proper order.
So far, as I said, dmd is working. Up until now, I've avoided
dub because, with so many code examples (more than 70 at
present) dub would bring in a lot of file/directory clutter.
But you're saying that dub will make it easier to keep up with
future changes/updates in all the various bits and bobs, so if
that means I finally have to do dub, perhaps someone could
point me at a good tutorial for that?
Sorry if I sound ungrateful or cranky, but I have a lot on my
plate ATM and I'm getting frustrated.
Hi Ron,
For one-file programs, dub usage is very easy.
Placing a minimal comment-header between /+ +/ symbol comments,
gets your job done like in this example ( I think the gtkd code
is from one of your examples in the blog):
/+
dub.sdl:
name "gtkhello"
dflags "-dip25" "-dip1000"
dependency "gtk-d:gtkd" version="~>3.8.0"
+/
/*
dub run --single gtkhello.d
dub build --single gtkhello.d.
dub gtkhello.d .
*/
module gtkhello;
import std.stdio;
import gtk.MainWindow;
import gtk.Main;
import gtk.Widget;
import gtk.Layout;
import gtk.Button;
import gdk.Event;
void main(string[] args)
{
Main.init(args);
TestRigWindow myTestRig = new TestRigWindow("Test Rig");
myTestRig.showAll();
Main.run();
} // main()
class TestRigWindow : MainWindow
{
this(string title)
{
// window
super(title);
addOnDestroy(delegate void(Widget w) { quitApp(); } );
auto myButton = new MyButt("Button Name");
auto myOtherButton = new MyOtherButt("Other Button Name");
// layout
auto myLayout = new MyLayout(myButton, myOtherButton);
add(myLayout);
} // this() CONSTRUCTOR
void quitApp()
{
writeln("Bye.");
Main.quit();
} // quitApp()
} // class myAppWindow
class MyLayout : Layout
{
this(MyButt myButton, MyOtherButt otherButton)
{
super(null, null);
put(myButton, 10, 20);
put(otherButton, 10, 60);
} // this()
} // class MyLayout
class MyButt : Button
{
this(string labelText)
{
super(labelText);
addOnButtonRelease();
} // this()
bool doSomething(Event e, Widget w)
{
writeln("Something was done.");
return(true);
} // doSomething()
} // class MyButt
class MyOtherButt : Button
{
this(string labelText)
{
super(labelText);
string message = "Something other than that was done.";
addOnClicked(delegate void(_) { doSomething(message); } );
} // this()
void doSomething(string messageText)
{
writeln(messageText);
} // doSomething()
}
---
Antonio
Re: Submenu Not Responding Until Second Click
On Friday, 8 February 2019 at 10:03:03 UTC, Ron Tarrant wrote: On Thursday, 7 February 2019 at 08:41:29 UTC, Antonio Corbi wrote: Hi Ron, xrandr (and gui interfaces for it like arandr) are your friends here. xrandr -q -> shows your card outputs and then you can use xrandr + options to configure monitors. Or you can use arandr that will do that for you and will allow you to visually spatially-arrange your monitors. Antonio Thanks for the tip, Antonio. I'd never heard of xrandr or arandr. Must be new since I stopped paying attention a few years ago. No, xrandr has been around for a long time: https://www.x.org/wiki/Projects/XRandR/ It makes easier than xinerama to configure several monitors. For example when I start my xsession with an external monitor attached to the HDMI port, I switch-off the internal laptop panel and use only the external one, a small script like this does the trick: xrandr | grep "HDMI-1 conn" >/dev/null if [ $? = 0 ] then xrandr --output HDMI-1 --auto --primary --output LVDS-1 --off fi Those names like HDMI-1 or LVDS-1 are the ones that 'xrandr' or 'xrandr -q' show you. Depending on the driver/card combination they may change. Xrandr requires that your card driver supports it, nowadays it is the usual thing, but you'll have to check that. Arandr (there are others) simplify the configure task due to their GUI based interface, though I prefer the text based interface that xrandr offers. Antonio.
Re: Submenu Not Responding Until Second Click
On Wednesday, 6 February 2019 at 13:13:44 UTC, Ron Tarrant wrote: On Tuesday, 5 February 2019 at 09:41:06 UTC, Antonio Corbi wrote: It could be so, I'm not using gnome so I can't say. By the way, I'm using gtk3 3.24.5. Yeah, I updated from 3.22 to 3.24, but it made no difference on Windows 10. Still that delay with submenus. I'd rather be running FreeBSD, but ATM I'm using an MSI laptop with two external monitors and I'm still working on getting Xorg configured to recognize even one of those external monitors. So, until then, I guess I'm stuck with this behaviour. Hi Ron, xrandr (and gui interfaces for it like arandr) are your friends here. xrandr -q -> shows your card outputs and then you can use xrandr + options to configure monitors. Or you can use arandr that will do that for you and will allow you to visually spatially-arrange your monitors. Antonio
Re: Submenu Not Responding Until Second Click
On Tuesday, 5 February 2019 at 09:31:01 UTC, Ron Tarrant wrote: On Tuesday, 5 February 2019 at 08:51:49 UTC, Antonio Corbi wrote: Have you tweaked your gtk theme? If so, could you try with the default (Adwaita) gtk theme? This is a Linux/Gnome thing, I'm assuming? Still, I'll look into other configuration stuff and see where it leads. Thanks, Antonio. It could be so, I'm not using gnome so I can't say. By the way, I'm using gtk3 3.24.5. Antonio
Re: Submenu Not Responding Until Second Click
On Monday, 4 February 2019 at 18:34:55 UTC, Ron Tarrant wrote: I posted about this over on the GtkD site, but I suspect no one's home until later in the day. [...] And it still does the same thing. First click, blue line. Second click, menu drops. Hi Ron: It's working OK for me (gtkd 3.8.5). Have you tweaked your gtk theme? If so, could you try with the default (Adwaita) gtk theme? Antonio
preconditions and interfaces
Hi all,
Playing with interfaces and preconditions in methods I get
strange results with dmd-2.0.84.0 but also with dmd-nightly. My
code is like this:
-
import std.stdio;
interface Thing2D {
void width(int w)
in {
writeln("Thing2D.width contract w = ",w);
assert(w > 0);
}
}
class Line : Thing2D {
override void width(int w)
in {
writeln("Line.width contract w = ",w);
assert(w >= 0);
}
do {
writeln("Line.width: w = ", w);
}
}
void main() {
auto l = new Line;
l.width(-1);
}
---
1) With dmd-2.084.0 I get:
./ifaceprecond
Thing2D.width contract w = 2
Line.width: w = -1
2) With dmd-nightly (as of today) I get random values for
interface's 'w':
./ifaceprecond
Thing2D.width contract w = 647271536
Line.width: w = -1
I think this should be an error caught by the contract, isn't it?
Thx!
Antonio
Re: Destructor for struct invoked many times
On Tuesday, 15 January 2019 at 10:49:17 UTC, rikki cattermole wrote: Because you passed it by value to writeln, which goes on to pass it to many other functions. Thanks Rikki! I was thinking about something like that. Antonio
Destructor for struct invoked many times
Hi,
In this simple example, the destructor for the struct is invoked
four more times than expected:
import std.stdio;
struct Person {
string name;
int age;
~this() {
writefln("%s is gone (0x%x)", name, );
}
}
int main(string[] args) {
Person* p = new Person;
writefln ("Created person (0x%x)", p);
p.name = "Peter";
p.age = 23;
writeln("Person:", *p); // Comment this line and try
return 0;
}
Output:
Created person (0x7f85ee997000)
Person:Person("Peter", 23)Peter is gone (0x7ffd916c1560)
Peter is gone (0x7ffd916c15c0)
Peter is gone (0x7ffd916c1640)
Peter is gone (0x7ffd916c16f0)
Peter is gone (0x7f85ee997000)
-
If I comment the line "writeln("Person:", *p);" then the
destructor is invoked only one time as expected.
Why is it?
Re: getopt short-options documentation
On Thursday, 29 November 2018 at 20:55:22 UTC, Daniel Kozak wrote:
Are you sure? Can you show me an example? I always forgot on
this limitation and somtimes it cause really nesty things :D
On Thu, Nov 29, 2018 at 6:05 PM Antonio Corbi via
Digitalmars-d-learn < digitalmars-d-learn@puremagic.com> wrote:
Hi!
Reading through the `getopt` documentation at one point it
says:
"Forms such as -t 5 and -timeout=5 will be not accepted."
But I'm able to to use short options like '-t 5' (with spaces
between the 't' and the '5'). It seems that this limitation
has been eliminated and it just-works-now, is it so?
Thx!
Hi Daniel!
Try this one :
---
module tools.trainer;
import std.stdio, std.getopt;
//
// Main Program //
//-
int main(string[] args) {
dcharletter = 'ñ';
string[] inputFiles;
string[] cmpFiles;
arraySep = ","; // defaults to "", separation by whitespace
auto helpInformation = getopt(args,
"letter|l", "The char that
represent the input images.", ,
"inputf|i", "The files that
represent the image of the same char.", ,
"cmpf|c", "The files that
represent images of other chars to compare with.", );
if (helpInformation.helpWanted) {
defaultGetoptPrinter("Some information about the program.",
helpInformation.options);
}
writeln("Letter selected is: ", letter);
return 0;
}
-
trainer -l Y
trainer -lY
Both of them work for me.
Antonio
getopt short-options documentation
Hi! Reading through the `getopt` documentation at one point it says: "Forms such as -t 5 and -timeout=5 will be not accepted." But I'm able to to use short options like '-t 5' (with spaces between the 't' and the '5'). It seems that this limitation has been eliminated and it just-works-now, is it so? Thx!
dub + ddoc
Hi! I'm trying to build the docs for my project with `dub -b docs` and dub also generates the docs for the dependencies of my project. Is it possible to generate the docs *only* for my code? Thx!
Re: GtkD help
On Saturday, 18 November 2017 at 22:31:15 UTC, Ivan Trombley wrote: Any information about using gio.Settings would be really appreciated too. Hi Ivan, I would recommend you to search for information about Gtk under valadoc pages [1]. You'll get Vala syntax but doing the mental-mapping to D+GtkD is automatic, i.e TreeView [2] and Glib Settings [3]. A. Corbi [1] https://valadoc.org/index.htm [2] https://valadoc.org/gtk+-3.0/Gtk.TreeView.html [3] https://valadoc.org/gio-2.0/GLib.Settings.html
Re: core file
On Monday, 13 November 2017 at 09:49:29 UTC, codephantom wrote: On Monday, 13 November 2017 at 06:25:20 UTC, Tony wrote: I am on Ubuntu 16.04. Thanks, I didn't know that "producing a core file" was configurable, and it appears that it isn't. ok. that's because Ubuntu is not (by default) setup for developers. But you can enable core dump for your executable easily enough. e.g, if you out file is a.out, then do this: ulimit -S -c unlimited a.out (now run your program, and you'll get core file in the same dir where the program is) (this won't be remembered after a reboot, so just do it when/as required). You can view the core file using > objdump -s core Good luck understanding the contents of that ;-) Core dumps typically require some specialised expertise to analyse. Unless you're one of those specialists, then better to just run your a.out through the debugger, and forget about the core dump (until you can't) ;-) Hi, core files can be used to do a 'post-mortem' debug session with gdb, from 'man gdb': You can also start with both an executable program and a core file specified: gdb program core If your program is compiled with '-g' option, gdb will load the executable and extract the information from the core file and it will show your program's state exactly as if it had been run from the debugger and had failed in that exactly moment. Antonio
Re: Working with images
On Wednesday, 1 November 2017 at 12:02:08 UTC, Alexandre wrote: I have a project written in C++, that I'm thinking to migrating to D, but, what is preventing me from migrating to D, is the part of the system that works with images, where the system generates the image of a payment receipt, currently in the system written in C ++, there is an array with image base RGB where I can open that RGB by lib. that I use to generate the image in C ++ (the lib I use is the CImg), in this system I need to insert texts, images and a bar code in that base image.. There is some lib. in D ( multiplataform ), that I could be this, insert texts, imagens and a barcode into a existing image, that I could be open from memory ? Hi Alxandre, You could use cairo[1] and the port to D provided by the GtkD project[2]. [1] https://www.cairographics.org/ [2] https://api.gtkd.org/gtkd/cairo/Context.html Antonio
Re: gtkD load images
On Thursday, 3 August 2017 at 21:06:36 UTC, Johnson Jones wrote:
On Thursday, 3 August 2017 at 13:12:03 UTC, Mengu wrote:
On Thursday, 3 August 2017 at 03:59:40 UTC, Johnson Jones
wrote:
How can be use gtkD to load images, I assume through
gdkpixbuf? While I am getting errors loading images through
glade's image:
(test.exe:8188): Gtk-[1;33mWARNING[0m **: Could not load
image 'a.jpg': Couldn't recognize the image file format for
file 'test\a.jpg'
(loads fine in glade)
which needs to be resolved, I'd also like to be able to use
gdkpixbuf to load images programmatically. There seems to be
no demos on the gtkD github page that deals with image
loading.
I've tried to do something like
import gtkc.gdkpixbuf;
auto x = c_gdk_pixbuf_get_formats().data;
but I don't know how to interpret x.
Also something like
import gtkc.gdkpixbuf;
void* x;
auto p = c_gdk_pixbuf_get_formats();
for(int i = 0; i < 10; i++)
{
x = p.data;
p = p.next;
}
which doesn't offer any help.
Aside: How can we call the gtk functions directly using gtkD?
Seems it uses stuff like
Linker.link(gdk_pixbuf_get_formats, "gdk_pixbuf_get_formats",
LIBRARY_GDKPIXBUF);
It does seem to alias to these function but something is off
and I'm not sure what.
hi
- is the gtk.Image class not working for you?
https://api.gtkd.org/gtkd/gtk/Image.html
- there's also a gdkpixbuf.Pixbuf that you can use.
https://api.gtkd.org/gtkd/gdkpixbuf/Pixbuf.html
- you can import those functions from gdkpixbuf.c.functions.
So, like I said, I've tried
import gdkpixbuf.Pixbuf;
auto x = Pixbuf.newFromResource("C:\\a.jpg");
which gives me that error I stated before for x86. For x64 it
simply crashes and no exception is given.
If I use a dummy image I get the same error:
"Unhandled exception: glib.GException.GException The resource
at “C:\adf.jpg” does not exist at
generated\gtkd\glib\GException.d(40)"
The error message makes look like like it should be
"Unhandled exception: glib.GException.GException The resource
at “C:\adf.jpg” does not exist at “C:\”
generated\gtkd\glib\GException.d(40)"
I'd rather use Pixbuf than image because I don't need to
generate a full blow image widget.
If I do
GError* err = null;
auto p =
gdk_pixbuf_new_from_resource(Str.toStringz("C:\\a.jpg"), );
p is null and err is
The resource at “D:\a.jpgâ€. does not exist.
which is clearly not true.
So not sure what is going on ;/ Seems to be a bug in pixbuf or
am I specifying the path wrong? If gtk.Image uses these
internally then it is working so...
Hi!
I load images using Gtk like this (I use gtk under gnu/linux):
Pixbuf pixbuf = new Pixbuf (filename);
And draw them in a GtkDrawingArea like this:
// redrawPage is a method from my window class
//theCanvas = cast(DrawingArea)
theBuilder.getObject("wCanvas");
//theCanvas.addOnDraw ();
private bool redrawPage (Scoped!Context ctx, Widget wda) {
if (pixbuf !is null) {
Pixbuf img;
int w, h;
ctx.scale (drawingScale, drawingScale);
w = cast(int) (pixbuf.getWidth * drawingScale);
h = cast(int) (pixbuf.getHeight * drawingScale);
theCanvas.setSizeRequest (w, h);
ctx.setSourcePixbuf (cast(Pixbuf) thePixmap, 0.0, 0.0);
ctx.paint ();
}
return true;
}
Hope it helps you.
A. Corbi
Re: How to replace pairs tags with regexp
On Friday, 21 July 2017 at 07:42:28 UTC, Suliman wrote:
On Friday, 21 July 2017 at 07:30:07 UTC, Antonio Corbi wrote:
On Friday, 21 July 2017 at 07:08:34 UTC, Suliman wrote:
On Friday, 21 July 2017 at 06:19:43 UTC, Suliman wrote:
There reason of issue above is spaces before "#".
What wrong with next regex https://dpaste.dzfl.pl/024a47ed2a56
I expect that it will select:
#Header
my header text
##SubHeader
my sub header text
Because: ^#{3}
Have you tried https://regex101.com/
It gives you results and explanations about your regex in
realtime.
A. Corbi
I tried. But I am getting different behavior in online editor
and in the code.
Could it be related to the regex's 'flavor' you are using?
A. Corbi
Re: How to replace pairs tags with regexp
On Friday, 21 July 2017 at 07:08:34 UTC, Suliman wrote:
On Friday, 21 July 2017 at 06:19:43 UTC, Suliman wrote:
There reason of issue above is spaces before "#".
What wrong with next regex https://dpaste.dzfl.pl/024a47ed2a56
I expect that it will select:
#Header
my header text
##SubHeader
my sub header text
Because: ^#{3}
Have you tried https://regex101.com/
It gives you results and explanations about your regex in
realtime.
A. Corbi
Re: replacement for squeeze and removechars.
On Tuesday, 18 July 2017 at 15:55:00 UTC, Seb wrote: On Tuesday, 18 July 2017 at 15:41:44 UTC, Meta wrote: As Seb somewhat undiplomatically put, there are replacements listed in the changelog. Sorry - it wasn't intended to be an offense or aggressive. I consider(ed) RTFM as common internet slang. Dont' worry Seb, I really appreciate very much your help. A. Corbi
Re: replacement for squeeze and removechars.
On Tuesday, 18 July 2017 at 15:41:44 UTC, Meta wrote:
On Tuesday, 18 July 2017 at 15:28:06 UTC, Antonio Corbi wrote:
Hi all,
I'm trying dmd-2.075.0-rc1 in one of my projects where I use
`squeeze` and `removechars`. Both of them are flagged as
obsolete and in the docs we are suggested to use functions
from std.regex and/or std.algorithm.
Does any one kow a one-liner from std.regex or std.algorithm
that can take the role of those deprecated functions?
Thank's
A. Corbi
As Seb somewhat undiplomatically put, there are replacements
listed in the changelog.
Use std.regex.replaceAll to replace std.string.removechars:
import std.string;
import std.regex;
// old
"abc".removechars("a-z");
// new
"abc".replaceAll(regex("[a-z]"), "");
Use std.algorithm.iteration.uniq to replace std.string.squeeze:
import std.algorithm;
import std.string;
// old
"hello".squeeze;
// new
"hello".uniq;
Though it would be nice to have these alternatives listed right
there in the deprecation message.
Thanks Meta and Seb!
Yes, the replacement is there 8), but as the deprecation message
told me "to go to the docs", I only had in mind the library
manual pages and not the changelog.
I agree with you that, at least, they could also be listed next
to `squeeze` and `removechars`.
Thanks for your help!
A. Corbi
replacement for squeeze and removechars.
Hi all, I'm trying dmd-2.075.0-rc1 in one of my projects where I use `squeeze` and `removechars`. Both of them are flagged as obsolete and in the docs we are suggested to use functions from std.regex and/or std.algorithm. Does any one kow a one-liner from std.regex or std.algorithm that can take the role of those deprecated functions? Thank's A. Corbi
Re: std.stdio.stderr
On Saturday, 10 June 2017 at 16:10:18 UTC, Russel Winder wrote:
It appears that std.stdio.stderr does not wor exactly as stdio
stderr
does. In particular std.stdio.stderr.writef(…) does not work as
fprintf(stderr…) does.
Some code I am porting from C++ to D makes use of ANSI escape
codes to go up a line and overwrite what was there, as well as
change colours. This work fine in the C++ code but fails in the
D code. The codes are definitely all the same, the only
difference is in the writing functions.
Is this problem to be expected or should it work?
Hi Russel,
It seems to work for me with a dumb example:
```
import std.stdio;
void main()
{
writefln("stdout: %s", "[7m[1mEdit source/app.d to start your
project.[0m");
stderr.writefln("stderr: %s", "[7m[1mEdit source/app.d to
start your project.[0m");
stderr.writefln("stderr: %s", "[0;31m[1mEdit source/app.d to
start your project.[0m");
stderr.writefln("%s", "[1A[12C[K");
}
```
Before copy/paste take into account that in sequences like "[7m",
etc... there's a hidden ESC char at the beginning, something
like: "\033[7m", and I can't see it in the preview of my posting.
Antonio
Re: Switch ignores case (?)
On Wednesday, 23 November 2016 at 22:13:38 UTC, ketmar wrote: On Wednesday, 23 November 2016 at 22:00:58 UTC, Steven Schveighoffer wrote: I can't see why you need to deal with the glue layer at all -- just tell the glue layer that it's a list of strings and not dstrings ;) 'cause that is how s2ir.d is done in dmd. ;-) it actually sorts *objects*, and objects knows how to order 'emselves. at this stage it is not trivial to treat objects as byte arrays (easy, but not a one-liner). sure, other compilers may do that differently, and it doesn't really matter how exactly the code for switch is generated until it works correctly. ;-) Could it be possible to ping M. Nowak to include the fix for this bug (due to its importance) in the final 2.072.1 release? Antonio
Re: Continued looking at properties in D - interfaces and constraints
On Wednesday, 12 October 2016 at 06:20:05 UTC, mikey wrote: On Sunday, 9 October 2016 at 14:06:42 UTC, Antonio Corbi wrote: 1. Inheritance with contracts is evaluated in a special way, 'in contracts' in the base and derived method (property) are or-ed, so if one of them passses, the contract is believed to have succeeded. As you don't have a contract in the base-method: "@property void width(int width)", I think that the compiler assumes that its empty contract is always true. Doesn't sound right to me. "Or"ing contracts with different inherited methods can't possibly be a feature. I'll create a bug report for it. Hi Mikey, It's the way DbC (Design by Contract) works, have a look at point 8 in https://www.eiffel.com/values/design-by-contract/introduction/ Antonio
Re: Continued looking at properties in D - interfaces and constraints
On Sunday, 9 October 2016 at 11:54:50 UTC, mikey wrote:
Hi,
I'm continuing to look at properties in D and have found
another area where I think there may be an issue - or maybe
where I'm doing something wrong.
I have started trying to use constraints on my properties to
constrain which values they can take I have also started trying
to use interfaces. What I noticed was that when I combine these
2 features the constraints get discarded.
interface Widthy {
@property inout(int) width() inout;
@property void width(int width);
}
class Test : Widthy {
private:
int _w;
public:
@property inout(int) width() inout { return _w; }
@property void width(int width)
in {
import std.exception;
if (width < 0) {
throw new
Exception("width is less than zero");
}
}
body {
_w = width;
}
}
void main() {
import std.stdio;
auto t = new Test;
t.width = -1;
writeln("width: ", t.width);
// width: -1
// hmmm... not good
}
Hi Mikey,
I think the failure you are experimenting is a mixture of two
problems:
1. Inheritance with contracts is evaluated in a special way, 'in
contracts' in the base and derived method (property) are or-ed,
so if one of them passses, the contract is believed to have
succeeded. As you don't have a contract in the base-method:
"@property void width(int width)", I think that the compiler
assumes that its empty contract is always true.
So it's a matter of adding some contract to it, i.e.:
interface Widthy
{
@property inout(int) width() inout;
@property void width(int w) in { assert(w > 7); }
}
But then comes...
2. This approach fails with dmd version: DMD64 D Compiler v2.071.2
but it works with ldc 1.0.0 and also with ldc-git (based on DMD
v2.071.2 and LLVM 3.8.1 , built with DMD64 D Compiler v2.071.2),
so I think it's a bug in DMD, but I'm very new to D, so I hope
that someone here with deeper knowledge can throw some light :)
Antonio
Re: Learning ddoc
On Thursday, 29 September 2016 at 11:50:26 UTC, bachmeier wrote: On Thursday, 29 September 2016 at 09:35:56 UTC, Antonio Corbi wrote: [...] They used https://github.com/economicmodeling/harbored Thanks! that's it. Antonio
Learning ddoc
Hi, I'm in the process of learning how ddoc works. I've successfully created docs for my code and recently learned how to generate it using dub. Related to this and after seeing the announcement of the new release of the emsi-containers library, I had a look at its docs (http://economicmodeling.github.io/containers/index.html) but when I cloned the repo and generated it locally its appearance is completely different (no side-bar, different formatting for code examples, etc...), it's simpler, it must lack some css or whatever. My question is...is there some standard way to generate better-looking doc-pages with ddoc? Thanks! Antonio
Re: How to get a screenshot?
On Thursday, 22 September 2016 at 07:50:07 UTC, Antonio Corbi
wrote:
On Thursday, 22 September 2016 at 02:21:16 UTC, Konstantin
Kutsevalov wrote:
On Wednesday, 21 September 2016 at 16:36:32 UTC, Adam D. Ruppe
wrote:
[...]
Hmm, that's good idea as fast solution. Thank you Adam.
Hi Konstantin,
I've got a simple example in Vala language but it's very easy
to rewrite it in D thank's to GtkD (and also thanks to Mike Wey
for his work in GtkD!):
// compile: valac --pkg gtk+-3.0 --pkg gdk-3.0 screenshot.vala
int main (string[] args) {
Gtk.init (ref args);
int width, height;
Gdk.Window win = Gdk.get_default_root_window();
width = win.get_width();
height = win.get_height();
Gdk.Pixbuf screenshot = Gdk.pixbuf_get_from_window(win, 0,
0, width, height);
screenshot.save("screenshot.png","png");
return 0;
}
Ok, took the time to translate it to D and created a github repo
to clone. You can download and try it from:
https://github.com/antoniocorbibellot/dsshot
Hope It helps you.
Antonio
Re: How to get a screenshot?
On Thursday, 22 September 2016 at 02:21:16 UTC, Konstantin
Kutsevalov wrote:
On Wednesday, 21 September 2016 at 16:36:32 UTC, Adam D. Ruppe
wrote:
On Wednesday, 21 September 2016 at 16:33:58 UTC, Konstantin
Kutsevalov wrote:
do anybody know how to get screenshot (for now in Linux
only)? May be some library , examples?
simplest might be to just call out to `shellExec("import
-window root filename.png");` and it will write the file.
Hmm, that's good idea as fast solution. Thank you Adam.
Hi Konstantin,
I've got a simple example in Vala language but it's very easy to
rewrite it in D thank's to GtkD (and also thanks to Mike Wey for
his work in GtkD!):
// compile: valac --pkg gtk+-3.0 --pkg gdk-3.0 screenshot.vala
int main (string[] args) {
Gtk.init (ref args);
int width, height;
Gdk.Window win = Gdk.get_default_root_window();
width = win.get_width();
height = win.get_height();
Gdk.Pixbuf screenshot = Gdk.pixbuf_get_from_window(win, 0, 0,
width, height);
screenshot.save("screenshot.png","png");
return 0;
}
Re: Array Copying syntax
On Friday, 16 September 2016 at 18:12:22 UTC, Steven Schveighoffer wrote: On 9/16/16 2:03 PM, Antonio Corbi wrote: Hi Jonathan! Probably this entry in https://dlang.org/spec/arrays.html#usage confused me a bit. int[3] s; s = ...; // error, since s is a compiled in static // reference to an array. Thanks for your help! Antonio Yeah, that's bad. https://github.com/dlang/dlang.org/pull/1474 -Steve Hi Steve, Way clearer (at least for me) with your patch! Thanks, Antonio
Re: Array Copying syntax
On Friday, 16 September 2016 at 17:55:59 UTC, Jonathan M Davis wrote: On Friday, September 16, 2016 17:22:41 Antonio Corbi via Digitalmars-d-learn wrote: Shouldn't it be mentioned then in the docs that this works for statically sized arrays and that in that case it copies contents? Well, I confess that I don't know why you would ever have thought that s = t; wouldn't work. The only mutable types that can't be assigned to like this are the ones that have disabled assignment or copying (which would only be certain structs). And I thought that the spec made it clear that static arrays were value types, in which case the behavior of s = t; should be obvious. So, I would have thought that it would be clear enough as-is, but clearly, it wasn't for you. So, I don't know. We do want the spec to be clear, but it would also be bad to add a bunch of redundant information in an attempt to be clearer. I'd have to go digging through the spec though to give any concrete suggestions on how to improve this though. - Jonathan M Davis Hi Jonathan! Probably this entry in https://dlang.org/spec/arrays.html#usage confused me a bit. int[3] s; ... s = ...; // error, since s is a compiled in static // reference to an array. Thanks for your help! Antonio
Re: Array Copying syntax
On Friday, 16 September 2016 at 17:11:54 UTC, Adam D. Ruppe wrote:
On Friday, 16 September 2016 at 17:03:20 UTC, Antonio Corbi
wrote:
Is it safe to use or do I have to use the proposed 's[] = t;'
or 's[] = t[]' ?
That works for all arrays. `s = t` for dynamically sized arrays
(aka slices) just sets the references to the same, but for your
statically sized arrays, it also copies.
Thank's Adam!
That's what my toy program told me:
---8><--
import std.stdio;
alias matrix = uint[3][2];
int main(string[] args) {
matrix s;
matrix t = [[1,2,3],
[4,5,6]];
writeln ("s= ", s);
writeln ("s.ptr= " , s.ptr);
writeln ("t= ", t);
writeln ("t.ptr= " , t.ptr);
writeln ("t[1][2]= ", t[1][2]);
s = t;
writeln ("s= ", s);
writeln ("s.ptr= " , s.ptr);
return 0;
}
---8><--
...but I wanted to be sure! :)
Shouldn't it be mentioned then in the docs that this works for
statically sized arrays and that in that case it copies contents?
Array Copying syntax
Hi! I was just playing with array initialization and copying and discovered that this syntax works as expected but it is not referenced under https://dlang.org/spec/arrays.html#array-copying: -8><- int[3] s; int[3] t; s = t; -8><- Is it safe to use or do I have to use the proposed 's[] = t;' or 's[] = t[]' ? Thank's!
Re: std.functional.compose compilation error
On Thursday, 25 August 2016 at 14:30:00 UTC, Meta wrote:
On Thursday, 25 August 2016 at 14:06:32 UTC, Antonio Corbi
wrote:
Hello,
Trying to compile this example from Chuck Allison:
---
import std.stdio;
import std.functional;
void main() {
auto div3 = (double x) => x/3.0;
auto sq = (double x) => x*x;
auto pls1 = (double x) => x+1.0;
alias compose!(div3,sq,pls1) comp;
writeln(comp(2.0)); // 3 == (2.0+1.0)^^2 / 3.0
alias pipe!(div3,sq,pls1) pip;
writeln(pip(2.0)); // 1.4 == (2.0/3.0)^^2 + 1.0
}
I get this error (with DMD64 D Compiler v2.071.1 in linux):
compose.d(8): Error: template instance compose!(div3, sq,
pls1) compose is not a template declaration, it is a module
But the error disappears if I use this import:
import std.functional:compose,pipe;
Is this a bug or is it the expected behaviour under the recent
'import' changes?
Thanks!
Try renaming your source file to something other than
compose.d, I think that's confusing the compiler.
Yep, that did the trick!
I also noticed that 'old' compilers like:
- gdc: gdc (GCC) 6.1.1 20160501
- ldc: LDC - the LLVM D compiler (1.0.0): based on DMD v2.070.2
and LLVM 3.8.0
*do* compile the original code posted without error.
Thank's to all of you for your answers.
std.functional.compose compilation error
Hello,
Trying to compile this example from Chuck Allison:
---
import std.stdio;
import std.functional;
void main() {
auto div3 = (double x) => x/3.0;
auto sq = (double x) => x*x;
auto pls1 = (double x) => x+1.0;
alias compose!(div3,sq,pls1) comp;
writeln(comp(2.0)); // 3 == (2.0+1.0)^^2 / 3.0
alias pipe!(div3,sq,pls1) pip;
writeln(pip(2.0)); // 1.4 == (2.0/3.0)^^2 + 1.0
}
I get this error (with DMD64 D Compiler v2.071.1 in linux):
compose.d(8): Error: template instance compose!(div3, sq, pls1)
compose is not a template declaration, it is a module
But the error disappears if I use this import:
import std.functional:compose,pipe;
Is this a bug or is it the expected behaviour under the recent
'import' changes?
Thanks!
Re: Caesar Cipher Cracking
On Sunday, 14 August 2016 at 18:36:02 UTC, Stefan wrote: same code, just a little shorter. usage of ".array" more UFCS replaced cast with ".to" Wow Stefan! Thanks for your time, I'll have a look at it! Antonio
Caesar Cipher Cracking
Hi folks,
I was just following Graham Hutton's excellent book "Programming
in Haskell" (http://www.cs.nott.ac.uk/~pszgmh/book.html) and in
chapter 5 He implements a Caesar-Cipher cracking algorithm in a
few lines of Haskell code
(http://www.cs.nott.ac.uk/~pszgmh/cipher.lhs).
So, as I'm also learning D, I decided to port it to D using the
very little functional-programming in D that I know.
No attempt to optimize it has been made, only following the
original Haskell code and rewrite it into D so there's room
(plenty) for optimization and usage of functional-programming
(I'm just learning here) techniques to make it more D-ish.
Hope this is useful to someone that is also learning D.
Happy message-cracking!
Antonio
---8><---
import std.stdio, std.conv;
import std.algorithm, std.algorithm.searching, std.range;
import std.ascii, std.string : countchars;
int let2int (char c) {
return cast(int) (c - 'a');
}
char int2let (int n) {
if (n >= 0)
return cast(char) ('a' + n);
else
return cast(char) ('z' + n + 1);
}
char shift (int n, char c) {
return isLower (c) ? int2let ((let2int (c) + n) % 26) : c;
}
string encode (int n, string s) {
string r;
s.each!(c => r ~= shift(n, c));
return r;
}
alias decode = (int n, string s) { return encode (-n, s); };
float percent (int n, int m) {
return (n / cast(float) m) * 100;
}
int[] positions (float x, float[] fl) {
int[] il;
auto r = zip (fl, iota(fl.length)).filter!(t => t[0]==x).map!(t
=> t[1]);
r.each!(a => il ~= cast(int)a);
return il;
}
int lowers (string s) {
return cast(int) count!(a => a.isLower)(s);
}
int cccount (char c, string s) {
return cast(int) countchars(s, to!string(c));
}
float[] freqs (string s) {
float[] f;
auto allChars = "abcdefghijklmnopqrstuvwxyz";
auto n = lowers(s);
auto r = allChars.map!(a => percent (cccount(to!char(a), s), n)
);
r.each!(a => f ~= a);
return f;
}
float chisqr (float[] os, float[] es) {
return zip(os, es).map!(t => ((t[0]-t[1])^^2)/t[1]).sum;
}
float[] rotate (int n, float[] fl) {
float[] f;
auto r = fl.drop(n) ~ fl.take(n);
r.each!(a => f ~= a);
return f;
}
string crack (string s) {
// ASCII letters frequency from 'a'..'z'
float[] table = [8.2, 1.5, 2.8, 4.3, 12.7, 2.2, 2.0, 6.1, 7.0,
0.2, 0.8, 4.0, 2.4,
6.7, 7.5, 1.9, 0.1, 6.0, 6.3, 9.1, 2.8, 1.0,
2.4, 0.2, 2.0, 0.1];
float[] table2 = s.freqs;
auto chitabr = iota(26).map!(n => rotate(n,
table2).chisqr(table));
float[] chitab;
chitabr.each!(a => chitab ~= a);
auto minval = reduce!(min)(chitab);
auto factor = positions (minval, chitab)[0];
return decode (factor, s);
}
void main()
{
writeln ("wyvnyhttpun pu kshun pz clyf mbu! = ",
crack ("wyvnyhttpun pu kshun pz clyf mbu!"));
}
Re: Default implementations in inherited interfaces
On Sunday, 24 July 2016 at 07:54:11 UTC, Jonathan Marler wrote: On Thursday, 21 July 2016 at 13:37:30 UTC, Saurabh Das wrote: On Thursday, 21 July 2016 at 12:42:14 UTC, Adam D. Ruppe wrote: On Thursday, 21 July 2016 at 09:41:27 UTC, Saurabh Das wrote: Java 8 has a 'default' keyword that allows interfaces to provide a default implementation and sub-classes can optionally override it if needed. The rationale behind it was extending interfaces without causing old code to faill. (called "virtual extension methods" or "defender methods"). The use case is similar to above. Is there a way to achieve an equivalent functionality in D? Thanks, Saurabh What an interesting technique. I've never seen this before. Maybe a DIP is in order? I think it would be low priority relative to the current work being done, but this technique seems like a good thing to support in the language. I first heard about this technique (or similar) in this post by Jim Nelson about the Vala language: https://blogs.gnome.org/jnelson/2011/11/01/a-few-of-my-favorite-vala-things-interface/ Antonio
Re: Dub recursive build and forcing pre-build commands to run
On Sunday, 10 July 2016 at 07:00:18 UTC, Meta wrote:
On Saturday, 9 July 2016 at 07:52:56 UTC, Antonio Corbi wrote:
I use the "preGenerateCommands" and "dependencies" like this:
"configurations" : [
{
"comment" : "Classic app.",
"name": "eqapp",
"preGenerateCommands" : ["sed -e
's#topdir/#$PACKAGE_DIR#' src/config/constants.d.in >
src/config/constants.d"],
"dependencies": {":dgtalib" : "*",
"gtk-d:gtkd": "~>3.3.0"},
},
Hope this helps you.
Antonio
When are pre-generate commands run?
Official docs say this:
preGenerateCommands string[] A list of shell commands that is
executed before project generation is started
If my memory serves me well I started to use it instead of
preBuildCommands because they are always executed and, in my
case, I needed that (to simulate the autoconf/cmake 'file.in ->
file' idiom).
Antonio
Re: Dub recursive build and forcing pre-build commands to run
On Saturday, 9 July 2016 at 00:03:22 UTC, Meta wrote:
I have two questions.
1. Is it possible to build subpackages when dub build is
invoked for the main package? It's a pain to first do dub build
:mysubpackage and then dub build.
2. It seems that when dub detects that no dependencies need to
be updated, it does not run the pre-build commands. I have some
pre-build commands that generate data to be imported by the
main package and thus must always be run for a build. Is there
a way to specify this?
I use the "preGenerateCommands" and "dependencies" like this:
"configurations" : [
{
"comment" : "Classic app.",
"name": "eqapp",
"preGenerateCommands" : ["sed -e
's#topdir/#$PACKAGE_DIR#' src/config/constants.d.in >
src/config/constants.d"],
"dependencies": {":dgtalib" : "*",
"gtk-d:gtkd": "~>3.3.0"},
},
Hope this helps you.
Antonio
Re: Needed return type in static method? bug or feature?
On Tuesday, 8 March 2016 at 14:13:17 UTC, Adam D. Ruppe wrote:
On Tuesday, 8 March 2016 at 13:40:06 UTC, Antonio Corbi wrote:
Is it a feature or a bug?
It is allowed because the "auto" keyword doesn't actually
required for auto functions (or variables), what you need is
any one of the storage classes.
Those include static, auto, const, immutable, even pure.
If any of them are present, the compiler knows you are writing
a function or declaring a variable and will infer the type.
Thank's Adam!.
I had figured out something like this but I couldn't find
anything in the docs
(http://dlang.org/spec/attribute.html#static), moreover, the
example there:
--8><-
class Foo
{
static int bar() { return 6; }
...
--8><-
does mention the return type, that's what confused me.
Needed return type in static method? bug or feature?
Hi all!
The following code compiles and works, but the static methods do
not
have a return type. It also compiles and works if the appropiate
(or auto)
return type is added to them.
-8><
import std.stdio;
class B {
int foo () { return 1; }
static sbar () { return "hi!"; }
static ibar () { return 0; }
}
void main () {
auto b = new B;
writeln (B.sbar);
writeln (B.ibar);
}
-8><
Is it a feature or a bug?
I've seen it being used in
https://github.com/gecko0307/dlib/blob/master/dlib/math/matrix.d
Thank's for your help!
