Re: UI Library
On Friday, 20 May 2022 at 02:37:48 UTC, harakim wrote: I need to write a piece of software to track and categorize some purchases. It's the kind of thing I could probably write in a couple of hours in C#/Java + html/css/javascript. However, something keeps drawing me to D and as this is a simple application, it would be a good one to get back in after almost a year hiatus. [...] Maybe you can use minigui from arsd https://github.com/adamdruppe/arsd
Re: Bug in std.json or my problem
On Wednesday, 22 April 2020 at 18:35:49 UTC, CraigDillabaugh wrote: On Wednesday, 22 April 2020 at 18:23:48 UTC, Anonymouse wrote: On Wednesday, 22 April 2020 at 17:48:18 UTC, Craig Dillabaugh wrote: clip File an issue if you have the time, maybe it will get attention. Unreported bugs can only be fixed by accident. I thought it might be worth filing a bug, but wanted to confirm if others thought this was actually a bug. I had encountered an identical issue with vibe-d years ago. Thanks for the feedback. After some digging it appears there is already a fix for this (though a bit old) … maybe I am the only person who cares about std.json after all :o) https://github.com/dlang/phobos/pull/5005/commits/e7d8fb83d2510b252cd8cfd2b744310de6fa84e5
Bug in std.json or my problem
So perhaps I am the only person in the world using std.json, but
I was wondering
if the following code should work.
=
import std.json;
import std.conv;
import std.stdio;
struct Person {
string name;
float income;
this (string name, float income) {
this.name = name;
this.income = income;
}
this(JSONValue js) {
this.name = to!string(js["name"]);
/* This next line crashes with .. JSONValue is not
floating type.
* to!float( js["income"].toString()) works.
*/
this.income = js["income"].floating;
}
JSONValue toJSON() {
JSONValue json;
json["name"] = JSONValue(this.name);
json["income"] = JSONValue(this.income);
return json;
}
}
int main(string[] argv) {
Person bob = Person("Bob", 0.0);
string bob_json = bob.toJSON().toString();
Person sonofbob = Person(parseJSON(bob_json));
writeln(sonofbob.toJSON().toPrettyString());
return 0;
}
===
The crash is caused because the 'income' field with value 0.0 is
output as 0 (rather than 0.0) and when it is read this is
interpreted
as an integer.
Shouldn't this work?
Re: How the hell to split multiple delims?
On Saturday, 15 February 2020 at 11:32:42 UTC, AlphaPurned wrote:
I've tried 10 different ways with split and splitter, I've used
all the stuff that people have said online but nothing works. I
always get a template mismatch error.
Why is something so easy to do so hard in D?
auto toks = std.regex.split(l, Regex("s"));
auto toks = std.regex.splitter(l, Regex("s"));
auto toks = std.regex.splitter(l, ctRegex!r"\.");
I had the same problem myself recently, and almost ended up here
to ask the same question as you but stumbled across the following
(ugly) solution without using regexs.
char[] line = "Split this by#space or#sign."
auto parts = line.splitter!(a => a=='#' | a==' ').array;
Re: To learn D
On Friday, 5 July 2019 at 12:00:15 UTC, Binarydepth wrote: I've considering learning full D. I remembered that D is not recommended as a first language, So I read time ago. So my question, is learning C and Python a good intro before learning D? TY Ali's book is targeted at beginners (see link below). I don't see why D wouldn't make a good first language. If your objective is to learn D, then I don't think learning C or Python is going to be help that much. Obviously if you know C/Python you can learn D more quickly, but I doubt the effort is worth it if D is the ultimate goal. http://ddili.org/ders/d.en/index.html
Re: more OO way to do hex string to bytes conversion
On Wednesday, 7 February 2018 at 03:25:05 UTC, rikki cattermole wrote: On 06/02/2018 8:46 PM, Craig Dillabaugh wrote: On Tuesday, 6 February 2018 at 18:46:54 UTC, H. S. Teoh wrote: [...] clip [...] clip [...] Wouldn't it be more accurate to say OO is not the correct tool for every job rather than it is "outdated". How would one write a GUI library with chains and CTFE? But you could with signatures and structs instead ;) I am not sure how this would work ... would this actually be a good idea, or are you just saying that technically it would be possible?
Re: more OO way to do hex string to bytes conversion
On Tuesday, 6 February 2018 at 18:46:54 UTC, H. S. Teoh wrote:
On Tue, Feb 06, 2018 at 06:33:02PM +, Ralph Doncaster via
Digitalmars-d-learn wrote:
clip
OO is outdated. D uses the range-based idiom with UFCS for
chaining operations in a way that doesn't require you to write
loops yourself. For example:
import std.array;
import std.algorithm;
import std.conv;
import std.range;
// No need to use .toStringz unless you're interfacing with C
auto hex = "deadbeef";// let compiler infer the type for you
auto bytes = hex.chunks(2) // lazily iterate over `hex` by
digit pairs
.map!(s => s.to!ubyte(16))// convert each pair to a ubyte
.array; // make an array out of it
// Do whatever you wish with the ubyte[] array.
writefln("%(%02X %)", bytes);
clip
T
Wouldn't it be more accurate to say OO is not the correct tool
for every job rather than it is "outdated". How would one write
a GUI library with chains and CTFE?
Second, while 'auto' is nice, for learning examples I think
putting the type there is actually more helpful to someone trying
to understand what is happening. If you know the type why not
just write it ... its not like using auto saves you any work in
most cases. I understand that its nice in templates and for
ranges and the like, but for basic types I don't see any
advantage to using it.
Re: Object oriented programming and interfaces
On Monday, 4 December 2017 at 20:43:27 UTC, Dirk wrote:
Hi!
I defined an interface:
interface Medoid {
float distance( Medoid other );
uint id() const @property;
}
and a class implementing that interface:
class Item : Medoid {
float distance( Item i ) {...}
uint id() const @property {...}
}
The compiler says:
Error: class Item interface function 'float distance(Medoid
other)' is not implemented
Is there a way to implement the Item.distance() member function
taking any object whose class is Item?
Interfaces are expected to implement static or final functions.
See #6 at:
https://dlang.org/spec/interface.html
interface Medoid {
static float distance( Medoid other );
uint id() const @property;
}
class Item : Medoid {
static float distance( Item i ) { return 0.0f; }
uint id() const @property { return 1; }
}
Re: Help with an algorithm!
On Thursday, 15 June 2017 at 13:41:07 UTC, MGW wrote:
On Thursday, 15 June 2017 at 13:16:24 UTC, CRAIG DILLABAUGH
wrote:
The purpose - search of changes in file system.
Sorting is a slow operation as well as hashing. Creation of a
tree, is equally in sorting.
So far the best result:
string[] rez;
foreach(str; m2) {
bool fFind; int j;
foreach(int i, s; m1) {
if(str == s) { fFind = true; j = i; break; }
}
if(!fFind) { rez ~= str; }
else {m1[j] = m1[$-1]; m1.length = m1.length - 1; }
}
// rez => rezult
How to parallel on thred?
radix sort is O(N) time, which is as fast as you can hope. But
given your specific problem domain (the strings are paths) an
initial radix sort step likely won't gain you much, as everything
is going to be sorted into a small subset of the buckets. So I
guess you can scrap that idea.
Knowing that your strings are actually file paths I think
building some sort of tree structure over M1 wouldn't be
unreasonable. You say go two or three levels deep on your
directory structure (ie nodes are labelled with directory name)
and use that to split M1 into buckets. If some bucket has too
many entries you could apply this recursively. Since you are only
building a constant number of levels and the number of nodes is
not likely to be too large you should do much better than N log N
* c time for this step.
Then you search with the elements of M2. You should be able to do
this in a multi-threaded way since once built, your data
structure on M1 is read-only you could just split M2 over X
threads and search. I am not an expert in this regard though, so
perhaps someone better informed than I can chime in.
Since strings will tend to have long common prefix's Ivan's Trie
idea would also work well.
Re: Help with an algorithm!
On Thursday, 15 June 2017 at 11:48:54 UTC, Ivan Kazmenko wrote: On Thursday, 15 June 2017 at 06:06:01 UTC, MGW wrote: There are two arrays of string [] mas1, mas2; Size of each about 5M lines. By the size they different, but lines in both match for 95%. It is necessary to find all lines in an array of mas2 which differ from mas1. The principal criterion - speed. There are the 8th core processor and it is good to involve a multithreading. The approaches which come to mind are: clip taking constant time. Ivan Kazmenko. As a follow up to this, if your alphabet is reasonably small perhaps could run radix sort based on the first few characters to split your arrays up into smaller subsets, and then use one of Ivan's suggestions within each subset. Subset searches could be easily run in parallel.
Re: Check of point inside/outside polygon
On Wednesday, 27 July 2016 at 14:56:13 UTC, Suliman wrote: On Wednesday, 27 July 2016 at 12:47:14 UTC, chmike wrote: On Wednesday, 27 July 2016 at 09:39:18 UTC, Suliman wrote: clip Sorry, its my issue I am thinging about polygons, but for me would be enought points. The problem is next. I am writhing geo portal where user can draw shape. I need to get users images that user shape cross. But as temporal solution it would be enough to detect if image central point inside this polygon (I know its coordinates). I can do its on DB level, but I would like to use SQLite that do bot have geometry support. So i am looking for any solution. I can use gdal but its _very_ heavy So when you say you want polygon intersection, is one of the polygons you are interested in the shape of the images (ie. roughly a rectangle)? If this is the case then you can likely just take the bounding rectangle (easily calculated) of your polygon and check if that intersects the bounding rectangle for the the image and that should work 95% of the time.
Re: Check of point inside/outside polygon
On Wednesday, 27 July 2016 at 09:39:18 UTC, Suliman wrote:
On Wednesday, 27 July 2016 at 08:40:15 UTC, chmike wrote:
The algorithm is to draw a horizontal (or vertical) half line
starting at your point and count the number of polygon edges
crossed by the line. If that number is even, the point is
outside the polygon, if it's odd, the point is inside.
Let (x,y) be the point to test and (x1,y1)(x2,y2) the end
points on each segment. Let n be the number of crossing that
you initialize to 0. (x1,y1)(x2,y2) are also the corners of
the rectangle enclosing the segment.
You then have to examine each segment one after the other. The
nice thing is that there are only two cases to consider.
1. When the point is on the left side of the rectangle
enclosing the segment.
2. When the point is inside the rectangle enclosing
if (y1 <= y2)
{
if ((y1 <= y) && (y2 >= y))
{
if ((x1 < x) && (x2 < x))
{
// case 1 : point on the left of the rectangle
++n;
}
else if (((x1 <= x) && (x2 >= x)) || ((x1 >= x) && (x2
<= x)))
{
// case 2 : point is inside of the rectangle
if ((x2 - x1)*(y - y1) >= (y2 - y1)*(x - x1))
++n; // Increment n because point is on the
segment or on its left
}
}
}
else
{
if ((y1 >= y) && (y2 <= y))
{
if ((x1 < x) && (x2 < x))
{
// case 1 : point on the left of the rectangle
++n;
}
else if (((x1 <= x) && (x2 >= x)) || ((x1 => x) && (x2
<= x)))
{
// case 2 : point is inside of the rectangle
if ((x2 - x1)*(y - y2) >= (y1 - y2)*(x - x1))
++n; // Increment n because point is on the
segment or on its left
}
}
}
This algorithm is very fast.
I didn't tested the above code. You might have to massage it a
bit for corner cases. It should give you a good push to start.
Big thanks!
Ehm... Now I should add iteration on array of points in first
and second polygon? If it's not hard for you could you show how
it should look please.
Easiest solution (if you don't care about performance) is to
pairwise compare every segment of both polygons to see if they
intersect, and if that fails, then run point-in-polygon algorithm
with one vertex from each polygon and the other (catches the case
where one polygon is entirely contained within the other).
Now you have the point in polygon algorithm (kindly provided by
chmike) and testing for segment intersection is a basic primitive
geometric operation, so there are lots of examples on the web.
You should certainly be able to find working C code for this
without much trouble.
Re: AA with dynamic array value
On Wednesday, 6 July 2016 at 02:33:02 UTC, ketmar wrote: On Wednesday, 6 July 2016 at 02:19:47 UTC, Craig Dillabaugh wrote: [...] this is true for any dynamic array, including AAs. until something is added to array, it actually a `null` pointer. i.e. arrays (and AAs) generally consisting of pointer to data and some length/info field. while array is empty, pointer to data is `null`. and when you passing your dynamic array slice/AA to function, it makes a copy of those internal fields. reallocing `null` doesn't affect the original variable. generally speaking, you should use `ref` if you plan to make your dynamic array/AA grow. i.e. void insertValue (ref int[][string]aa, string key, int value) Thanks for giving me the correct solution, and for the explanation. Cheers, Craig
Re: AA with dynamic array value
On Wednesday, 6 July 2016 at 02:03:54 UTC, Adam D. Ruppe wrote:
On Wednesday, 6 July 2016 at 01:58:31 UTC, Craig Dillabaugh
wrote:
*(keyvalue) ~ value; // This line fails.
That should prolly be ~= instead of ~.
Ahh, I was so close. Thank you that seems to do the trick.
However, now I have another issue.
For the following main function:
int main( string[] args) {
int[][string] myAA;
//int[] tmp;
//tmp ~= 7;
//myAA["world"] = tmp;
insertValue( myAA, "hello", 1 );
insertValue( myAA, "goodbye", 2 );
insertValue( myAA, "hello", 3 );
foreach (k; myAA.keys.sort)
{
writefln("%3s %d", k, myAA[k].length);
}
return 0;
}
If I run this, it prints out nothing. However, if I uncomment
adding an element for 'world' then it prints (as expected):
goodbye 1
hello 2
world 1
Why doesn't my function allow me to insert elements into an empty
associative array, but succeeds for an AA with some element in it?
AA with dynamic array value
How can I create (and update) and associative array where the key
is a string, and the value is a dynamic array of integers?
For example:
void insertValue( int[][string]aa, string key, int value )
{
int[]* keyvalue;
keyvalue = ( key in aa );
if ( keyvalue !is null )
{
*(keyvalue) ~ value; // This line fails.
}
else {
int[] tmp;
tmp ~= value;
aa[key] = tmp;
}
}
int main( string[] args) {
int[][string] myAA;
insertValue( myAA, "hello", 1 );
insertValue( myAA, "goodbye", 2 );
insertValue( myAA, "hello", 3 );
return 0;
}
Fails with:
...(16): Error: ~ has no effect in expression (*keyvalue ~ value)
Thanks for any help.
Re: Issue with 2.071: Regression or valid error?
On Wednesday, 6 April 2016 at 19:01:58 UTC, Craig Dillabaugh wrote: On Wednesday, 6 April 2016 at 15:10:45 UTC, Andre wrote: clip Not so up to date on D's OOP stuff, but don't you want create() to be protected, not private. You can typically access a private method through a base class, which is what you are doing with cat.create(). You CAN'T typically access a private ...
Re: Issue with 2.071: Regression or valid error?
On Wednesday, 6 April 2016 at 15:10:45 UTC, Andre wrote:
Hi,
With 2.071 following coding does not compile anymore and
somehow I feel it should compile.
The issue is with line "cat.create();".
Cat is a sub type of Animal. Animal "owns" method create and I
want to call the method
create within the class Animal for cat.
Is the error message "no property create for type 'b.cat'"
valid or not?
Kind regards
André
module a;
import b;
class Animal
{
private void create() {}
void foo(Cat cat)
{
cat.create(); // >> no property create for type 'b.cat'
}
}
void main() {}
--
module b;
import a;
class Cat: Animal {};
compile with
rdmd a b
Not so up to date on D's OOP stuff, but don't you want create()
to be protected, not private. You can typically access a private
method through a base class, which is what you are doing with
cat.create().
Re: How is D doing?
On Thursday, 24 December 2015 at 00:16:16 UTC, rsw0x wrote: On Tuesday, 22 December 2015 at 21:38:22 UTC, ZombineDev wrote: On Tuesday, 22 December 2015 at 17:49:34 UTC, Jakob Jenkov wrote: clip removed C++ because it just dwarfs the others. D, as I expected, has a massive following in Japan. I'm still not quite sure why. Hey, this can be D's theme song: https://www.youtube.com/watch?v=Cg6rp20OGLo
Re: DUB linking to local library
On Tuesday, 4 August 2015 at 08:18:58 UTC, John Colvin wrote: On Tuesday, 4 August 2015 at 03:20:38 UTC, Craig Dillabaugh wrote: I can now run it with: LD_LIBRARY_PATH=/home/craig2/code/gdal-2.0.0/lib64 ./gdaltest But it appears the LD_LIBRARY_PATH hack is causing havoc with other libraries, as I get errors loading other shared libraries when I do that. At the very least you want to do: LD_LIBRARY_PATH=/home/craig2/code/gdal-2.0.0/lib64:$LD_LIBRARY_PATH ./gdaltest Thanks!
Re: DUB linking to local library
On Tuesday, 4 August 2015 at 04:21:27 UTC, Joakim Brännström wrote: On Tuesday, 4 August 2015 at 03:20:38 UTC, Craig Dillabaugh wrote: clip Linkers, so fun they are... https://wiki.debian.org/RpathIssue As you can see in the search order RPATH takes precedence over LD_LIBRARY_PATH. If we assume that you want LD_LIBRARY_PATH to be able to override the lib you could use the following flags. lflags : [ --enable-new-dtags, -rpath=/home/craig2/code/gdal-2.0.0/lib64/, -L/home/craig2/code/gdal-2.0.0/lib64/ ] you can see what it is in the binary with: readelf --dynamic gdaltest|grep PATH This should make LD_LIBRARY_PATH redundant. //Joakim I knew using LD_LIBRARY_PATH was frowned upon, thanks for enlightening me on the correct way to handle this. Works beautifully now.
DUB linking to local library
I have been writing bindings for the GDAL library (www.gdal.org).
I recently updated my bindings to the latest release of GDAL
(2.0).
Before adding my bindings to code.dlang.org I want to run some
tests. I've built GDAL2 locally and want to link my bindings to
this library. However, I also have the older GDAL libraries
(1.11) installed system wide on my machine.
My GDAL bindings have the following dub.json file:
{
name: gdald,
description: D bindings for the Geospatial Data Abstraction
Library (GDAL).,
homepage: https://github.com/craig-dillabaugh/TBD;,
homepage: http://www.gdal.org/;,
importPaths:[.],
targetType:sourceLibrary,
license: MIT,
authors: [
Craig Dillabaugh
],
libs : [gdal]
}
While my test program appears as follows:
{
name: gdaltest,
description: Test cases for GDAL D.,
copyright: Copyright © 2014, Craig Dilladub bubaugh.,
authors: [
Craig R. Dillabaugh
],
dependencies: {
gdald : {version: ~master}
},
lflags : [
-L/home/craig2/code/gdal-2.0.0/lib64/libgdal.so.20.0.0 ],
libs : [gdal],
targetPath : .,
targetType : executable
}
I used add-local so that my test program could see my bindings.
My issue is that while everything compiles OK (with dub build)
the resulting executable gdaltest seems to be linked with the
system gdal.so file and not the libgdal.so.20.0.0 file I
specified with lflags.
ldd prints out:
ldd gdaltest
linux-vdso.so.1 (0x7ffe417e2000)
libgdal.so.1 = /usr/lib64/libgdal.so.1
(0x7faabacf8000)
So how can I force my application to link to my local copy of
GDAL2 at /home/craig2/code/gdal-2.0.0/lib64. Any help is
appreciated.
Craig
Re: DUB linking to local library
On Tuesday, 4 August 2015 at 02:45:21 UTC, Joakim Brännström wrote: On Tuesday, 4 August 2015 at 02:26:17 UTC, Craig Dillabaugh wrote: So how can I force my application to link to my local copy of GDAL2 at /home/craig2/code/gdal-2.0.0/lib64. Any help is appreciated. Hi, I recently ran into similare problems, different lib. Try changing: lflags : [-L/home/craig2/code/gdal-2.0.0/lib64/libgdal.so.20.0.0 ] libs : [gdal] to: lflags : [-L/home/craig2/code/gdal-2.0.0/lib64/ ] libs : [:libgdal.so.20.0.0] observe the flags dub passes on to dmd by using --vverbose //Joakim Thanks. Everything compile perfectly, and now the correct libs are linked it seems, but I still have an issue with the executable: ldd gdaltest linux-vdso.so.1 (0x7ffe63381000) libgdal.so.20 = not found I can now run it with: LD_LIBRARY_PATH=/home/craig2/code/gdal-2.0.0/lib64 ./gdaltest But it appears the LD_LIBRARY_PATH hack is causing havoc with other libraries, as I get errors loading other shared libraries when I do that.
Re: Binding Nested C Structs
On Friday, 10 July 2015 at 03:38:49 UTC, Craig Dillabaugh wrote:
I am trying to bind to a C union with a number of nested
structs declared as follows:
typedef union {
int Integer;
struct {
int nCount;
int *paList;
} IntegerList;
struct {
int nCount;
GIntBig *paList;
} Integer64List;
} OGRField;
According to
http://wiki.dlang.org/D_binding_for_C#Nested_Structs
I should attempt to write something like (last example shown):
extern(C) union OGRField
{
int Integer;
struct {
int nCount;
int* paList;
}
struct {
int nCount;
GIntBig* paList;
}
}
But that is obviously not going to work. Does anyone know the
right way
to handle nested C structs of that form.
OK Found the answer elsewhere on the same page:
extern(C) union OGRField
{
int Integer;
struct _IntegerList
{
int nCount;
int* paList;
}
_IntegerList IntegerList;
struct _Integer64List
{
int nCount;
GIntBig* paList;
}
_Integer64List Integer64List;
}
Binding Nested C Structs
I am trying to bind to a C union with a number of nested structs
declared as follows:
typedef union {
int Integer;
struct {
int nCount;
int *paList;
} IntegerList;
struct {
int nCount;
GIntBig *paList;
} Integer64List;
} OGRField;
According to http://wiki.dlang.org/D_binding_for_C#Nested_Structs
I should attempt to write something like (last example shown):
extern(C) union OGRField
{
int Integer;
struct {
int nCount;
int* paList;
}
struct {
int nCount;
GIntBig* paList;
}
}
But that is obviously not going to work. Does anyone know the
right way
to handle nested C structs of that form.
Re: Converting void* to D array
On Wednesday, 15 April 2015 at 04:43:39 UTC, Daniel Kozák wrote: On Wed, 15 Apr 2015 04:24:20 + Craig Dillabaugh via Digitalmars-d-learn digitalmars-d-learn@puremagic.com wrote: Hi. I want to call a C library function that returns a data buffer as a void*. How do I convert the resulting void* into something I can process in D? //I have the following function from the GDAL C library. extern(C) CPLErr GDALReadBlock( GDALRasterBandH, int, int, void* ); So I have (GByte is defined in the GDAL library): void* buffer = malloc( GByte.sizeof * x_block_size * y_block_size ); I fill the buffer (and ignore any errors :o) GDALReadBlock( AGDALRasterBandHInstance, xblock, yblock, buffer ); Now, how can I access the data in buffer? Or you probably can do it like this: auto buffer = new GByte[xblock*yblock]; GDALReadBlock( AGDALRasterBandHInstance, xblock, yblock, (cast void*)buffer.ptr ); Thank you very much. Works like a charm. Make that last line: GDALReadBlock( AGDALRasterBandHInstance, xblock, yblock, cast(void*)buffer.ptr );
Converting void* to D array
Hi. I want to call a C library function that returns a data buffer as a void*. How do I convert the resulting void* into something I can process in D? //I have the following function from the GDAL C library. extern(C) CPLErr GDALReadBlock( GDALRasterBandH, int, int, void* ); So I have (GByte is defined in the GDAL library): void* buffer = malloc( GByte.sizeof * x_block_size * y_block_size ); I fill the buffer (and ignore any errors :o) GDALReadBlock( AGDALRasterBandHInstance, xblock, yblock, buffer ); Now, how can I access the data in buffer?
Contributing to Phobos Documentation
Motivated by this thread: http://forum.dlang.org/thread/measc3$qic$1...@digitalmars.com I was hoping to see if I could do some work on the Phobos documentation, but I am curious to know what the easiest way for someone with limited/no ddoc experience to get involved in this would be. I checked the CONTRIBUTING.md file in phobos and it is a bit on the 'light' side. I assume just fixing stuff in my local repo and sending PRs would be insufficient, as I should be 'testing' my documentation changes. Is there a resource where I can learn how to generate the phobos documentation for phobos locally. Second question, can I generate documentation for a single module rather than all of phobos each time I try to update something. Craig
Re: Contributing to Phobos Documentation
On Saturday, 21 March 2015 at 21:53:00 UTC, H. S. Teoh wrote: On Sat, Mar 21, 2015 at 05:48:40PM +, Craig Dillabaugh via Digitalmars-d-learn wrote: Motivated by this thread: http://forum.dlang.org/thread/measc3$qic$1...@digitalmars.com I was hoping to see if I could do some work on the Phobos documentation, but I am curious to know what the easiest way for someone with limited/no ddoc experience to get involved in this would be. I checked the CONTRIBUTING.md file in phobos and it is a bit on the 'light' side. I assume just fixing stuff in my local repo and sending PRs would be insufficient, as I should be 'testing' my documentation changes. Is there a resource where I can learn how to generate the phobos documentation for phobos locally. On Posix: git clone https://github.com/D-Programming-Language/dlang.org cd dlang.org make -f posix.mak phobos-prerelease cd .. ln -s dlang.org/web . cd ../phobos make -f posix.mak html You should now be able to point your browser at web/phobos-prerelease/index.html and see the generated docs. Or copy web/* into your web folder of your local webserver and point your browser to the appropriate URL. Note that for this to work, the dlang.org and phobos repos must share a common parent directory, as the makefiles currently make a lot of assumptions about your directory layout, and may die horribly if you use a non-standard layout. Second question, can I generate documentation for a single module rather than all of phobos each time I try to update something. [...] You could just run `make -f posix.mak html` and it should only update those files that changed since you last ran it. (In theory, anyway. Make is unreliable and sometimes you have to delete the generated files in order to refresh them, but hopefully this will be rare.) T Thanks very much. Craig
Re: Dlang seems like java now,but why not let d more like C# Style?
On Saturday, 14 March 2015 at 09:59:05 UTC, dnewer wrote: yes,java is good lang,but i dont think it's better than c#,if no oracle or google support java will less and less. C# is a good and easy lang. i like C# . but,C# cant compiled to native code. So far, I have been searching for a language, like c # write efficiency, but more secure than that of c #, more efficient (runs), stronger (system-level, driving level) What has led you to this conclusion? I don't personally find D very much like Java. It definitely doesn't push OO design on you like Java (even where it isn't needed), and code is much more concise in my experience. I also find D very much more flexible. I don't have any C# experience so I can't compare those languages much, but I've heard people say their are D / C# similarities. Anyway, this isn't a criticism of your comment, I was just curious what (other than the shared C++ syntax heritage) you find so Java-like in D? Cheers, Craig
Re: Getting started with vibe.d
On Tuesday, 3 June 2014 at 16:16:10 UTC, Chris Saunders wrote: I've made my first attempt to use dub/vibe.d and I'm running into some issues I can't find on the list. I'm on Ubuntu 14.04/x86_64, using the latest stable dub (0.9.21). I can create a new dub project: “”” $ dub init test vibe.d Successfully created an empty project in '/home/csaunders/devel/csaunders/mongoSB/test' “”” ...but then I'm having trouble building: “”” $ cd test $ dub build --compiler=ldc2 vibe-d: [vibe-d, libevent, openssl] test: [test, vibe-d, libevent, openssl] Building vibe-d configuration libevent, build type debug. FAIL ../../../../.dub/packages/vibe-d-0.7.19/.dub/build/libevent-debug-linux.posix-x86_64-ldc2-0C180158569265198380A4CE65BB2C41 vibe-d staticLibrary Error executing command build: No LDC static libraries supported “”” ...I've tried a few variations on this but haven't had any luck. This is using the latest ldc: “”” $ ldc2 --version LDC - the LLVM D compiler (0.12.1): based on DMD v2.063.2 and LLVM 3.3.1 Default target: x86_64-unknown-linux-gnu Host CPU: corei7 http://dlang.org - http://wiki.dlang.org/LDC Registered Targets: x86- 32-bit X86: Pentium-Pro and above x86-64 - 64-bit X86: EM64T and AMD64 “”” Any pointers? Just curious, can you get it to work with DMD? Also, you might consider posting on the Rejected Software forums (although this forum isn't a bad idea). http://forum.rejectedsoftware.com/
Re: Getting started with vibe.d
On Tuesday, 3 June 2014 at 17:41:27 UTC, Chris Saunders wrote: Thanks, I somehow missed the vibe.d forums... I'd need an ldc solution in the end, but trying dmd is a good idea. The result is some kind of link error to libevent?: dub build vibe-d: [vibe-d, libevent, openssl] test: [test, vibe-d, libevent, openssl] Target is up to date. Using existing build in /home/csaunders/.dub/packages/vibe-d-0.7.19/.dub/build/libevent-debug-linux.posix-x86_64-dmd-AB0707232CA963B5DA23C2232BBED51B/. Use --force to force a rebuild. Building test configuration application, build type debug. Compiling... Linking... .dub/build/application-debug-linux.posix-x86_64-dmd-6EEB0831D66A347BFD0076DC383B442F/test.o:(.data._D162TypeInfo_S3std8typecons130__T5TupleTS3std9container54__T5ArrayTS4vibe4core7drivers9libevent212TimeoutEntryZ5ArrayVAyaa6_5f73746f7265TmVAyaa7_5f6c656e677468Z5Tuple6__initZ+0x60): undefined reference to `_D3std8typecons130__T5TupleTS3std9container54__T5ArrayTS4vibe4core7drivers9libevent212TimeoutEntryZ5ArrayVAyaa6_5f73746f7265TmVAyaa7_5f6c656e677468Z5Tuple15__fieldPostBlitMFZv' collect2: error: ld returned 1 exit status --- errorlevel 1 FAIL .dub/build/application-debug-linux.posix-x86_64-dmd-6EEB0831D66A347BFD0076DC383B442F test executable Error executing command build: Link command failed with exit code 1 Just a guess, but do you have the dev libraries for libevent installed?
Re: D Newbie Trying to Use D with Major C Libraries
On Thursday, 15 May 2014 at 22:25:47 UTC, Tom Browder via
Digitalmars-d-learn wrote:
I am a volunteer developer with the well-known 3D CAD FOSS
project BRL-CAD:
http://brlcad.org
I have wanted to use D for a long time but I hadn't taken the
plunge.
Yesterday I advertised to the BRL-CAD community my new project
to
attempt to create D bindings for BRL-CAD's C libraries, and I
created
a branch for the project.
I have been looking for specific information on creating D
bindings
from C headers for which there seems to be sufficient
information
available, but I would appreciate recommendations as to the best
method. I have successfully built my first pure D program but
now
need to test the feasibility of my project.
What I have not seen yet is the exact way to build a D program
which
uses D bindings and its matching C library. I have just
created a
Cookbook page on the D Wiki where I show my first attempt for a
real
GNU Makefile as an example for the project. The page link is
here:
http://wiki.dlang.org/Using_C_libraries_for_a_D_program
I would appreciate it if an experienced D user would correct
that
recipe so it should compile the desired binary source correctly
(assuming no errors in the input files).
Thanks for any help.
Best regards,
-Tom
Hi Tom,
Sadly, I lack the expertise to give you much advice. I did read
through your Wiki posting though. One thing that came to mind
was you used GMake. Perhaps you should consider using DUB. For
example here is the DUB config file for one of my library
bindings (in my case I used a static library though):
{
name: shplib,
description: D bindings for Shapelib. Shapefile
reader.,
homepage:
https://github.com/craig-dillabaugh/shplib.d;,
homepage: http://shapelib.maptools.org/;,
importPaths:[.],
targetType: sourceLibrary,
authors: [
Craig Dillabaugh
],
sourcePaths: [./source],
libs-posix : [libshp]
}
A little nicer that GMake, more the D way, and cross platform
... I think.
Not sure exactly how you change that for linking to a .so lib.
Cheers,
Craig
Re: D Newbie Trying to Use D with Major C Libraries
On Friday, 16 May 2014 at 01:16:46 UTC, Craig Dillabaugh wrote:
On Thursday, 15 May 2014 at 22:25:47 UTC, Tom Browder via
Digitalmars-d-learn wrote:
I am a volunteer developer with the well-known 3D CAD FOSS
project BRL-CAD:
http://brlcad.org
I have wanted to use D for a long time but I hadn't taken the
plunge.
Yesterday I advertised to the BRL-CAD community my new project
to
attempt to create D bindings for BRL-CAD's C libraries, and I
created
a branch for the project.
I have been looking for specific information on creating D
bindings
from C headers for which there seems to be sufficient
information
available, but I would appreciate recommendations as to the
best
method. I have successfully built my first pure D program but
now
need to test the feasibility of my project.
What I have not seen yet is the exact way to build a D program
which
uses D bindings and its matching C library. I have just
created a
Cookbook page on the D Wiki where I show my first attempt for
a real
GNU Makefile as an example for the project. The page link is
here:
http://wiki.dlang.org/Using_C_libraries_for_a_D_program
I would appreciate it if an experienced D user would correct
that
recipe so it should compile the desired binary source correctly
(assuming no errors in the input files).
Thanks for any help.
Best regards,
-Tom
Hi Tom,
Sadly, I lack the expertise to give you much advice. I did
read through your Wiki posting though. One thing that came to
mind was you used GMake. Perhaps you should consider using
DUB. For example here is the DUB config file for one of my
library bindings (in my case I used a static library though):
{
name: shplib,
description: D bindings for Shapelib. Shapefile
reader.,
homepage:
https://github.com/craig-dillabaugh/shplib.d;,
homepage: http://shapelib.maptools.org/;,
importPaths:[.],
targetType: sourceLibrary,
authors: [
Craig Dillabaugh
],
sourcePaths: [./source],
libs-posix : [libshp]
}
A little nicer that GMake, more the D way, and cross platform
... I think.
Not sure exactly how you change that for linking to a .so lib.
Cheers,
Craig
Some info on DUB can be found at:
http://code.dlang.org/
Writing to stdin of a process
I want to be able to write to the stdin stream of an external
process using std.process. I have the following small test app.
myecho.d
--
import std.stdio;
void main(string[] args)
{
foreach (line; stdin.byLine()) {
stdout.writeln(line);
}
}
--
If I call this from the command line, it echo's back whatever I
write
to it.
Then I have the following program.
testpipes.d
---
import std.process;
import std.stdio;
void main( string[] args ) {
auto pipes = pipeProcess(./myecho, Redirect.stdin );
scope(exit) wait(pipes.pid);
pipes.stdin().writeln(Hello world);
}
If I compile and run testpipes.d, nothing happens. I was
expecting
it to echo back Hello world to me.
Can anyone tell me what I am dong wrong.
Re: Writing to stdin of a process
On Saturday, 26 April 2014 at 13:30:41 UTC, Adam D. Ruppe wrote: On Saturday, 26 April 2014 at 08:45:59 UTC, Craig Dillabaugh wrote: Can anyone tell me what I am dong wrong. In this case, I'd close the pipe when you're done. pipes.stdin().writeln(Hello world); pipes.stdin.close; myecho loops on stdin until it receives everything; until the pipe is closed. testpipes waits for myecho to complete before termination. The two processes are waiting on each other: testpipes won't close the file until it exits, and myecho won't exit until testpipes closes the file. an explicit call to close breaks the deadlock. In this case, flushing would cause the one line to appear, because of the buffering yazd talked about, but the program still wouldn't terminate since a flushed buffer still potentially has more coming so echo would see that line, then wait for more.. Thank you Adam, and yazd for your responses, now it works. Thanks also for the explanations, I was wondering how myecho.d would know when the input was finished so it could terminate.
Re: Example of parse whole json answer.
On Thursday, 24 April 2014 at 12:17:42 UTC, Nicolas wrote:
I have a json string saved in a file ( example of json tweeter
answer:
https://dev.twitter.com/docs/api/1.1/get/statuses/user_timeline
). I am trying to read the whole json answer and print specific
data (created_at, retweet_count, ..) . I am new at D
Programming language and i was wondering if someone can help me
or post some example that show how to parse json strings using
std.json library. Thanks in advance.
Here is something to get you started. The initial version of
this code was from Ali Cehreli, I can't remember what
modifications are mine, or if this is all straight form Ali.
If you intend to do any serious work with Json, I highly
recommend you check out Vibe.d (www.vibed.org) - more stuff to
learn but its JSON capabilities are awesome compared to what
std.json gives you.
import std.stdio;
import std.json;
import std.conv;
import std.file;
/**
Ali's example.
*/
struct Employee
{
string firstName;
string lastName;
}
void readEmployees( string employee_json_string )
{
JSONValue[string] document =
parseJSON(employee_json_string).object;
JSONValue[] employees = document[employees].array;
foreach (employeeJson; employees) {
JSONValue[string] employee = employeeJson.object;
string firstName = employee[firstName].str;
string lastName = employee[lastName].str;
auto e = Employee(firstName, lastName);
writeln(Constructed: , e);
}
}
void main()
{
// Assumes UTF-8 file
auto content =
`{
employees: [
{ firstName:Walter , lastName:Bright },
{ firstName:Andrei , lastName:Alexandrescu },
{ firstName:Celine , lastName:Dion }
]
}`;
readEmployees( content );
//Or to read the same thing from a file
readEmployees( readText( employees.json ) );
}
