Re: FIFO
On Monday, 13 May 2024 at 15:07:39 UTC, Andy Valencia wrote:
On Sunday, 12 May 2024 at 22:03:21 UTC, Ferhat Kurtulmuş wrote:
https://dlang.org/phobos/std_container_slist.html
This is a stack, isn't it? LIFO?
Ahh yes. Then use dlist
Thank you. I read its source, and was curious so I wrote a
small performance measurement: put 10,000 things in a FIFO,
pull them back out, and loop around that 10,000 times. My FIFO
resulted in:
real0m1.589s
user0m1.585s
sys 0m0.004s
And the dlist based one:
real0m4.731s
user0m5.211s
sys 0m0.308s
Representing the FIFO as a linked list clearly has its cost,
but I found the increased system time interesting. OS memory
allocations maybe?
The code is spaghetti, fifo/dlist, but it seemed the easiest
way to see the two API's being used side by side:
version(fifo) {
import tiny.fifo : FIFO;
} else {
import std.container.dlist : DList;
}
const uint ITERS = 10_000;
const uint DEPTH = 10_000;
void
main()
{
version(fifo) {
auto d = FIFO!uint();
} else {
auto d = DList!uint();
}
foreach(_; 0 .. ITERS) {
foreach(x; 0 .. DEPTH) {
version(fifo) {
d.add(x);
} else {
d.insertBack(x);
}
}
foreach(x; 0 .. DEPTH) {
version(fifo) {
assert(x == d.next());
} else {
assert(x == d.front());
d.removeFront();
}
}
}
}
thank you for sharing the results. Everything I read about queues
recommends doublylinked lists. With your array based
implementatio if you are consuming the elements faster than
pushing new elements, your array buffer never resize which is
costly. This should explain why your array based queue is more
performant.
Re: Find homography in D?
On Sunday, 21 April 2024 at 14:57:33 UTC, Paolo Invernizzi wrote: Hi, Someone can point me to a D implementation of the classical OpenCV find homography matrix? Thank you, Paolo Now, we can do image stitching using DCV. It needs improvements though. https://github.com/libmir/dcv/tree/master/examples/imagestitchinghomography
Re: FIFO
On Saturday, 11 May 2024 at 23:44:28 UTC, Andy Valencia wrote: I need a FIFO for a work scheduler, and nothing suitable jumped out at me. I wrote the following, but as a newbie, would be happy to receive any suggestions or observations. TIA! [...] I don't know your use case, maybe you have a similar problem I had to solve years ago. https://forum.dlang.org/post/xktftztisodpngcow...@forum.dlang.org
Re: FIFO
On Sunday, 12 May 2024 at 21:08:24 UTC, Andy Valencia wrote: On Sunday, 12 May 2024 at 19:45:44 UTC, Ferhat Kurtulmuş wrote: On Saturday, 11 May 2024 at 23:44:28 UTC, Andy Valencia wrote: I need a FIFO for a work scheduler, and nothing suitable jumped out at me. ... https://dlang.org/phobos/std_container_slist.html This is a stack, isn't it? LIFO? Andy Ahh yes. Then use dlist
Re: FIFO
On Saturday, 11 May 2024 at 23:44:28 UTC, Andy Valencia wrote: I need a FIFO for a work scheduler, and nothing suitable jumped out at me. I wrote the following, but as a newbie, would be happy to receive any suggestions or observations. TIA! [...] "next" is not a usual range primitive word in dlang. Why not just using slist.
Re: FIFO
On Saturday, 11 May 2024 at 23:44:28 UTC, Andy Valencia wrote: I need a FIFO for a work scheduler, and nothing suitable jumped out at me. I wrote the following, but as a newbie, would be happy to receive any suggestions or observations. TIA! [...] https://dlang.org/phobos/std_container_slist.html
Re: Find homography in D?
On Sunday, 21 April 2024 at 14:57:33 UTC, Paolo Invernizzi wrote:
Hi,
Someone can point me to a D implementation of the classical
OpenCV find homography matrix?
Thank you,
Paolo
Just for future records in the forum.
//
https://math.stackexchange.com/questions/3509039/calculate-homography-with-and-without-svd
/+dub.sdl:
dependency "lubeck" version="~>1.5.4"
+/
import std;
import mir.ndslice;
import kaleidic.lubeck;
void main()
{
double[2] x_1 = [93,-7];
double[2] y_1 = [63,0];
double[2] x_2 = [293,3];
double[2] y_2 = [868,-6];
double[2] x_3 = [1207,7];
double[2] y_3 = [998,-4];
double[2] x_4 = [1218,3];
double[2] y_4 = [309,2];
auto A = [
-x_1[0], -y_1[0], -1, 0, 0, 0, x_1[0]*x_1[1],
y_1[0]*x_1[1], x_1[1],
0, 0, 0, -x_1[0], -y_1[0], -1, x_1[0]*y_1[1],
y_1[0]*y_1[1], y_1[1],
-x_2[0], -y_2[0], -1, 0, 0, 0, x_2[0]*x_2[1],
y_2[0]*x_2[1], x_2[1],
0, 0, 0, -x_2[0], -y_2[0], -1, x_2[0]*y_2[1],
y_2[0]*y_2[1], y_2[1],
-x_3[0], -y_3[0], -1, 0, 0, 0, x_3[0]*x_3[1],
y_3[0]*x_3[1], x_3[1],
0, 0, 0, -x_3[0], -y_3[0], -1, x_3[0]*y_3[1],
y_3[0]*y_3[1], y_3[1],
-x_4[0], -y_4[0], -1, 0, 0, 0, x_4[0]*x_4[1],
y_4[0]*x_4[1], x_4[1],
0, 0, 0, -x_4[0], -y_4[0], -1, x_4[0]*y_4[1],
y_4[0]*y_4[1], y_4[1]
].sliced(8, 9);
auto svdResult = svd(A);
auto homography = svdResult.vt[$-1].sliced(3, 3);
auto transformedPoint = homography.mtimes([1679, 128,
1].sliced.as!double.slice);
transformedPoint[] /= transformedPoint[2];
writeln(transformedPoint); //[4, 7, 1]
}
Re: Find homography in D?
On Sunday, 21 April 2024 at 14:57:33 UTC, Paolo Invernizzi wrote: Hi, Someone can point me to a D implementation of the classical OpenCV find homography matrix? Thank you, Paolo Kinda some work but it should be doable using DCV and mir.lubeck in theory DCV can compute, not sift or surf b, but similar features https://github.com/libmir/dcv/blob/master/examples/features/source/app.d Lubeck computes singular value decomposition https://github.com/kaleidicassociates/lubeck And this method but with mir ndslices https://medium.com/all-things-about-robotics-and-computer-vision/homography-and-how-to-calculate-it-8abf3a13ddc5
Re: Statically compiled binary with C interop crashes.
On Wednesday, 17 April 2024 at 11:03:22 UTC, yabobay wrote: I'm using [dray](https://code.dlang.org/packages/dray) in my project with dub, here's the relevant parts of the dub.json: [...] İt seems your issue is related to the raylib itself, neither the binding you use nor the d programming language. İnstalling x11 development package may resolve the issue.
Re: How to set include paths of a c source in dub when using importc
On Wednesday, 17 April 2024 at 00:40:28 UTC, Alex Bryan wrote: If you're not using gdc exclusively, you'll want to take a look at this: https://github.com/dlang/dub/pull/2818 I knew there was something wrong there.
Re: How to set include paths of a c source in dub when using importc
On Saturday, 13 April 2024 at 22:00:16 UTC, Ferhat Kurtulmuş wrote: On Saturday, 13 April 2024 at 21:41:41 UTC, Ferhat Kurtulmuş wrote: On Saturday, 13 April 2024 at 21:39:10 UTC, Ferhat Kurtulmuş wrote: On Saturday, 13 April 2024 at 21:21:24 UTC, Richard (Rikki) Andrew Cattermole wrote: [...] Another question how can one define a preprocessor var for a c source from dub.json? for instance: c source has #ifdef ORT_DLL_IMPORT normally we do it like -D ORT_DLL_IMPORT ohh I found it: -P no this does not work: "dflags": ["-P=SOME_FLAG"], c1: fatal error C1083: Cannot open source file: 'SOME_FLAG': No such file or directory The docs need an example. I was too stupid to figure this out quickly. "-P-DORT_DLL_IMPORT"
Re: How to set include paths of a c source in dub when using importc
On Saturday, 13 April 2024 at 21:41:41 UTC, Ferhat Kurtulmuş wrote: On Saturday, 13 April 2024 at 21:39:10 UTC, Ferhat Kurtulmuş wrote: On Saturday, 13 April 2024 at 21:21:24 UTC, Richard (Rikki) Andrew Cattermole wrote: On 14/04/2024 8:59 AM, Ferhat Kurtulmuş wrote: These don't work for me: "dflags": ["-Iinclude"] "importPaths": [ "include" ], The importc docs do not help either. Appears it hasn't been documented in new dub docs. It is ``cSourcePaths`` and ``cImportPaths``. https://github.com/dlang/dub-docs/issues/91 Another question how can one define a preprocessor var for a c source from dub.json? for instance: c source has #ifdef ORT_DLL_IMPORT normally we do it like -D ORT_DLL_IMPORT ohh I found it: -P no this does not work: "dflags": ["-P=SOME_FLAG"], c1: fatal error C1083: Cannot open source file: 'SOME_FLAG': No such file or directory
Re: How to set include paths of a c source in dub when using importc
On Saturday, 13 April 2024 at 21:39:10 UTC, Ferhat Kurtulmuş wrote: On Saturday, 13 April 2024 at 21:21:24 UTC, Richard (Rikki) Andrew Cattermole wrote: On 14/04/2024 8:59 AM, Ferhat Kurtulmuş wrote: These don't work for me: "dflags": ["-Iinclude"] "importPaths": [ "include" ], The importc docs do not help either. Appears it hasn't been documented in new dub docs. It is ``cSourcePaths`` and ``cImportPaths``. https://github.com/dlang/dub-docs/issues/91 Another question how can one define a preprocessor var for a c source from dub.json? for instance: c source has #ifdef ORT_DLL_IMPORT normally we do it like -D ORT_DLL_IMPORT ohh I found it: -P
Re: How to set include paths of a c source in dub when using importc
On Saturday, 13 April 2024 at 21:21:24 UTC, Richard (Rikki) Andrew Cattermole wrote: On 14/04/2024 8:59 AM, Ferhat Kurtulmuş wrote: These don't work for me: "dflags": ["-Iinclude"] "importPaths": [ "include" ], The importc docs do not help either. Appears it hasn't been documented in new dub docs. It is ``cSourcePaths`` and ``cImportPaths``. https://github.com/dlang/dub-docs/issues/91 Another question how can one define a preprocessor var for a c source from dub.json? for instance: c source has #ifdef ORT_DLL_IMPORT normally we do it like -D ORT_DLL_IMPORT
Re: How to set include paths of a c source in dub when using importc
On Saturday, 13 April 2024 at 21:21:24 UTC, Richard (Rikki) Andrew Cattermole wrote: On 14/04/2024 8:59 AM, Ferhat Kurtulmuş wrote: These don't work for me: "dflags": ["-Iinclude"] "importPaths": [ "include" ], The importc docs do not help either. Appears it hasn't been documented in new dub docs. It is ``cSourcePaths`` and ``cImportPaths``. https://github.com/dlang/dub-docs/issues/91 thank you Rikki.
How to set include paths of a c source in dub when using importc
These don't work for me: "dflags": ["-Iinclude"] "importPaths": [ "include" ], The importc docs do not help either.
Re: How to add a character literal to a string without ~ operator?
On Thursday, 4 April 2024 at 21:23:00 UTC, user1234 wrote:
On Thursday, 4 April 2024 at 19:56:50 UTC, Ferhat Kurtulmuş
wrote:
[...]
```d
module runnable;
import std.stdio : writeln;
import std.range : chain;
void main() @nogc
{
auto s = chain("as ", "df ", "j"); // s is lazy
writeln(s);
}
```
Bad example. The range is indeed a `@nogc` lazy input range but
`writeln` is not a `@nogc` consumer.
[...]
The input range consumer has to be @nogc as well.
I don't understand your point sorry. I didn't imply anything
about @nogc. I of course know writeln is not nogc. I just kept
the example simple.
Re: How to add a character literal to a string without ~ operator?
On Thursday, 4 April 2024 at 18:14:54 UTC, BoQsc wrote:
I'm looking for more readable standard function to add a
**character** literal to a **string**.
The `~` operator is clearly not great while reading a source
code.
I'm not here to discuss that. I'm looking for a function inside
standard library.
The function should be straightforward, up to two words.
Here is what I expect from a programming language:
Pseudo example:
```
import std;
void main(){
string word = hello;
join(word, 'f', " ", "World");
writeln(word); // output: hellof World
}
```
My favorite d feature is lazy ranges. No allocation here.
```
auto s = chain("as ", "df ", "j"); // s is lazy
writeln(s);
```
Of course you can allocate a new string from the chained range:
```
string str = cast(string)s.array.assumeUnique; // without a cast
it is a dstring (why though?)
```
Re: Alguien me dice como podria conectarme a una base de datos en SQL server?
On Thursday, 14 March 2024 at 16:42:04 UTC, dany wrote:
Hola a todos necesito conectarme a una base de datos sql y ps
no me sale :'(
quisiera saber como podria porfis, ayuda :')
import std.stdio;
import std.json;
//import std.database.mysql;
//import raylib;
import ddbc;
void main() {
//string urlServer =
"ddbc:sqlserver://DESKTOP-HLK011R\\MSSQLSERVER02,1433?user=dany,password=1234567890";
//string urlServer =
"ddbc:sqlserver://DESKTOP-RNTV16H:1433";
auto conn = createConnection(urlServer);
scope(exit) conn.close();
}
Deberias preguntar en Ingles en este foro. No mucha gente que
habla Espanol aqu. Puedes buscar un biblioteca en
https://code.dlang.org/search?q=sql. Usa un biblioteca de allı.
No se como se lol hace con MySQL pero se lo hace con MySQL:
https://code.dlang.org/packages/mysql-native
import mysql.safe;
Connection conn;
Connection connectDB(){
auto connectionStr =
"host=localhost;port=3306;user=root;pwd=;db=deneyler";
return new Connection(connectionStr);
}
Tines que usar una otra biblioteca por MySQL, por supuesto
Re: Recommendation about templating engine library
On Monday, 11 March 2024 at 14:26:01 UTC, Andrea wrote: Hi folks, Working on a side project I have the need to generate text files (mainly D source code) via a templating system. My use case is to have some JSON data populated at runtime from an API and fill-in placeholders in the text with the ability of doing loops over arrays, simple conditions and so on, mostly what https://pkg.go.dev/text/template provides for Go. Any recommendation on a good library to use ? I tried https://code.dlang.org/packages/temple but I don't wand to bring in the whole vibe-d dependency ; other projects I found in DUB like `mustache-d`, `jax` or `djinn` seems mostly unmaintained. Opinions ? Many thanks You have already mentioned mustache-d. If it compiles with the recent compilers go for it. I used it some time a go for a similar task involving in d code gen.
Re: Are exceptions caught in unittests?
On Friday, 16 February 2024 at 08:48:08 UTC, Jonathan M Davis wrote: On Friday, February 16, 2024 1:06:26 AM MST Ferhat Kurtulmuş via Digitalmars- d-learn wrote: [...] 1. assertThrown does not test whether something somewhere in what you called threw an exception. It asserts that it catches an exception. Your example here is catching the exception and returning so the exception never escapes the division function, and there's nothing for assertThrown to catch. [...] Hi Jonathan, thank you for clearly explaining in detail how it works. I added trailing parenthesis to the lambda inside assertThrown, which worked as expected. Ferhat
Re: Are exceptions caught in unittests?
On Friday, 16 February 2024 at 07:43:24 UTC, Ferhat Kurtulmuş
wrote:
When I tried to catch exceptions in my unit test, I found that
exceptions were not thrown or caught in the unit test blocks.
So, I cannot use assertThrown at all. Is this a bug or expected
behavior that I don't know?
Using LDC 1.36.0 on Windows.
https://github.com/aferust/evalex/blob/main/source/evalex.d#L694
Even a test code like this does not work:
```d
string division(int a, int b) {
string result = "";
try {
if( b == 0 ) {
throw new Exception("Cannot divide by zero!");
} else {
result = format("%s",a/b);
}
} catch (Exception e) {
result = e.msg;
}
return result;
}
assertThrown({division(50, 0);});
```
Re: Are exceptions caught in unittests?
On Friday, 16 February 2024 at 07:54:01 UTC, Richard (Rikki)
Andrew Cattermole wrote:
This should be working.
I don't know what is going on.
All I can suggest is to use a debugger to see if it is indeed
throwing and then catching.
A test code like this works, but unittest doesn't. This is crazy:
```d
import std.stdio;
import evalex;
void main(){
string text = "2 + * 3";
try {
auto evaluator = new Eval!double(text);
auto result = evaluator.result;
writeln(result);
}catch (ParserException e){
writeln(e.msg);
}
}
```
Are exceptions caught in unittests?
When I tried to catch exceptions in my unit test, I found that exceptions were not thrown or caught in the unit test blocks. So, I cannot use assertThrown at all. Is this a bug or expected behavior that I don't know? Using LDC 1.36.0 on Windows. https://github.com/aferust/evalex/blob/main/source/evalex.d#L694
Re: D: Convert/parse uint integer to string. (@nogc)
On Friday, 24 November 2023 at 09:35:00 UTC, BoQsc wrote:
I tried to look into https://dlang.org/phobos/std_conv.html
Most of the functions inside `std.conv` seem to be dependant on
[Garbage Collection](https://dlang.org/spec/garbage.html).
And I couldn't find a straightforward way to produce a `string`
value out of `uint` value.
How to convert or parse `uint` value to a `string` in `@nogc`
way?
I guess there are third-party libraries doing this. One would use
stdc functions such as sprintf. Probably, there should be a more
d-ish way.
```
import core.stdc.stdio : sprintf;
import core.stdc.math : log10;
import std.exception : assumeUnique;
import std.stdio : writeln;
size_t nod(int num){
return cast(size_t)((num==0)?1:log10(num)+1);
}
void main()
{
int myint = 23;
char[80] str;
sprintf(str.ptr, "%d", myint);
string _dstring = str[0..nod(myint)].assumeUnique;
writeln(_dstring);
}
```
Re: extern (c)
On Wednesday, 11 October 2023 at 12:36:58 UTC, Paul wrote: What does the extern (c) attribute(?) do? Does it tell the compiler/linker to build the function like a C compiler would build a C function? If so what does that mean? Does it tell the compiler/linker to let C functions know it exists? If so what does that mean? Is it meant for the compiler or linker or both? Thanks for any assistance. It is about name mangling. It prevents symbol names from using D's name mangling. https://dlang.org/blog/2017/12/20/ds-newfangled-name-mangling/
Re: Struct nested function
On Wednesday, 13 September 2023 at 05:58:13 UTC, vino wrote:
Hi All,
Request your help, I have a struct which has many functions,
I need to run a function from within another function(From
Display function execute the runner function), an example as
below
From,
Vino
The problem starts here:
```string *runnerptr = ```
You are trying to assign a delegate to string*. Even if we fix
this, we hit another error because D programming language does
not allow capturing a reference to this, which is not permitted
in tasks (IMHO). We fix this using a lambda ```auto result =
task(() => runner());```. Then the final code that runs should be
like:
```d
import std.stdio: writeln;
import std.algorithm: joiner;
import std.parallelism: task;
import std.typecons: tuple;
struct MainEngine {
int rno;
string firstname;
string lastname;
int age;
this(in int _rno) { rno = _rno; }
auto ref FirstName(in string _firstname) { firstname =
_firstname; return this; }
auto ref LastName(in string _lastname) { lastname =
_lastname; return this; }
auto ref Age(in int _age) { age = _age; return this; }
auto Display () {
auto runner(string status = "Male")
{
auto record = tuple([firstname,",",lastname].joiner,
age, status);
return record;
}
auto result = task(() => runner());
//writeln(typeof(result).stringof);
result.executeInNewThread;
result.yieldForce;
return result;
}
}
void main () {
auto mrunner =
MainEngine(1).FirstName("Fname").LastName("Lname").Age(25).Display();
writeln((*mrunner).yieldForce); // Access the result field to
get the value returned by the task
}
```
Re: D web browser?
On Friday, 8 September 2023 at 06:42:13 UTC, Joe wrote: Is there a D library that lets one access the web through a browser like interface? I need to access some URLS as if I was browsing them(it needs to run scripts in the page). E.g., C# has WebBrowser that lets one programmatically control a browser. I'd like something similar. It does not need to be graphical but it does need to be able to handle javascript and forms and allow programmatic interaction and ideally quite light(else it almost defeats the purpose). Those are some works that I remember. https://github.com/skoppe/spasm an example code: https://github.com/skoppe/spasm/tree/master/examples/fetch https://github.com/adamdruppe/arsd and its docs: http://arsd-official.dpldocs.info/arsd.html#web-scraper https://github.com/adamdruppe/webassembly/blob/master/tetris.d Probably, more can be found at https://code.dlang.org/?sort=updated=20=library.web
Re: How can I execute C++ functions from Dlang?
On Saturday, 19 August 2023 at 20:50:23 UTC, thePengüin wrote: On Saturday, 19 August 2023 at 20:16:47 UTC, Ferhat Kurtulmuş wrote: On Saturday, 19 August 2023 at 19:41:47 UTC, thePengüin wrote: On Monday, 14 August 2023 at 07:36:31 UTC, Ferhat Kurtulmuş wrote: [...] estoy usando el de 64 o almenos eso es lo que me dice cuando hago un dmd --version: DMD64 D Compiler v2.104.2-dirty Copyright (C) 1999-2023 by The D Language Foundation, All Rights Reserved written by Walter Bright por cierto "cl" en ves de g++, creo que es la abreviatura de "compilador" no? porque cl no me sale como comando en el mingw64x84 Estoy escribendo en mi celular. Entonces no tomo ayudar de Google translate. Mi español no es bueno, disculpa. Nunca uso un mesclar de mingw-g++ y algun d compilador en Windows. cl es el comando del Visual C++. No sé si g++ y dmd son binarias compatibles. Yo siempre uso LDC en Windows. Creo que tu deberias installar e uso Visual studio c++ community edition. Los compiladores msvc juega bien con los compiladores de dlang. Que es cl.exe: https://learn.microsoft.com/en-us/cpp/build/reference/compiler-options?view=msvc-170 - te refieres al ldc de Dlang en windows no? Sí, yo queria decir esto. Lo puedes descargar aqui: https://github.com/ldc-developers/ldc/releases/tag/v1.33.0 Por favor te recorda que cuando tu installaste msvc, siempre ejecuta tus comandos del compiladores (cl, ldc2 o dmd, etc.) en terminal del msvc. Puedes buscarlo en menu de inicio de windows porque automatiza link con bibliotheca de stdc++.
Re: How can I execute C++ functions from Dlang?
On Saturday, 19 August 2023 at 19:41:47 UTC, thePengüin wrote:
On Monday, 14 August 2023 at 07:36:31 UTC, Ferhat Kurtulmuş
wrote:
On Monday, 14 August 2023 at 06:40:04 UTC, thePengüin wrote:
hola a todos quisiera ejecutar este codigo de c++
`
#include \
using namespace std;
int main() {
return 0;
}
int foo(int i, int j) {
cout \<\< i\<\
?Tu usas ambos de 64 bit o 32 bit para compiladores?
No puedo reproducir tu codigo. Pero yo puedo ejecutar esto en
Windows:
cppcode.cpp
```d
#include
using namespace std;
// no nececitamos un main aqui
int foo(int i, int j) {
cout << i << endl;
cout << j << endl;
return 7;
}
```
main.d
```d
extern(C++) int foo(int i, int j);
void main () {
foo(3,6);
}
```
La compulacion:
cl cppcode.cpp -c
dmd main.d cppcode.obj
estoy usando el de 64 o almenos eso es lo que me dice cuando
hago un dmd --version:
DMD64 D Compiler v2.104.2-dirty
Copyright (C) 1999-2023 by The D Language Foundation, All
Rights Reserved written by Walter Bright
por cierto "cl" en ves de g++, creo que es la abreviatura de
"compilador" no? porque cl no me sale como comando en el
mingw64x84
Estoy escribendo en mi celular. Entonces no tomo ayudar de Google
translate. Mi español no es bueno, disculpa. Nunca uso un mesclar
de mingw-g++ y algun d compilador en Windows. cl es el comando
del Visual C++. No sé si g++ y dmd son binarias compatibles. Yo
siempre uso LDC en Windows. Creo que tu deberias installar e uso
Visual studio c++ community edition. Los compiladores msvc juega
bien con los compiladores de dlang.
Que es cl.exe:
https://learn.microsoft.com/en-us/cpp/build/reference/compiler-options?view=msvc-170
Re: Mir-algorithm tutorial?
On Saturday, 19 August 2023 at 01:44:16 UTC, Kyle Ingraham wrote: On Friday, 18 August 2023 at 12:14:45 UTC, Ferhat Kurtulmuş wrote: I think the main problem is the mir libraries won't get updates since Ilya recently said that he was not an open source developer anymore. That’s unfortunate for D but hopefully beneficial for Ilya. Was it said somewhere publicly where I can read more on it? https://forum.dlang.org/post/u7r1i8$rn7$1...@digitalmars.com
Re: Mir-algorithm tutorial?
On Friday, 18 August 2023 at 09:57:11 UTC, Ki Rill wrote: On Friday, 18 August 2023 at 09:32:31 UTC, Ferhat Kurtulmuş wrote: I believe the most recent docs for mir-algorithm is here http://mir-algorithm.libmir.org/ Thanks. Yes, that's the only thing. However, it's not a good starting point for someone who just wants to get to know the library and play around... Yes there isn't many guides around. Those are some of them. https://tastyminerals.github.io/tasty-blog/dlang/2020/03/22/multidimensional_arrays_in_d.html https://jackstouffer.com/blog/nd_slice.html Also this piece of code was converted from python-numpy to d-mir. https://github.com/libmir/dcv/blob/master/source/dcv/imgproc/threshold.d#L138 I converted many more from python for DCV. I think the main problem is the mir libraries won't get updates since Ilya recently said that he was not an open source developer anymore.
Re: Mir-algorithm tutorial?
On Friday, 18 August 2023 at 07:54:04 UTC, Ki Rill wrote: Is there an up-to-date tutorial? It's just painful that I cannot find anything helpful on this topic. The official mir-algorithm GitHub repo links to articles with old code that won't build if I copy-paste it. I'm left hunting down the changes and guessing how things should really work. I believe the most recent docs for mir-algorithm is here http://mir-algorithm.libmir.org/
Re: Finding duplicate elements
On Tuesday, 15 August 2023 at 17:59:27 UTC, vino wrote: Hi All, Request your help in finding duplicate element without sorting as per the below example ``` Example: string[] args = [" test3", "test2 ", " test1 ", " test1 ", " "]; Output Required: If duplicate element found then print "Duplicate element found: " else print ["test3", "test2", "test1"]; ``` From, Vino.B Another approach would be using a rbtree as container at the first place.
Re: How can I execute C++ functions from Dlang?
On Monday, 14 August 2023 at 06:40:04 UTC, thePengüin wrote:
hola a todos quisiera ejecutar este codigo de c++
`
#include \
using namespace std;
int main() {
return 0;
}
int foo(int i, int j) {
cout \<\< i\<\
?Tu usas ambos de 64 bit o 32 bit para compiladores?
No puedo reproducir tu codigo. Pero yo puedo ejecutar esto en
Windows:
cppcode.cpp
```d
#include
using namespace std;
// no nececitamos un main aqui
int foo(int i, int j) {
cout << i << endl;
cout << j << endl;
return 7;
}
```
main.d
```d
extern(C++) int foo(int i, int j);
void main () {
foo(3,6);
}
```
La compulacion:
cl cppcode.cpp -c
dmd main.d cppcode.obj
Re: Loading Textures in OpenGL
On Sunday, 23 July 2023 at 18:06:46 UTC, Ruby The Roobster wrote: On Sunday, 23 July 2023 at 17:45:53 UTC, Ferhat Kurtulmuş wrote: On Sunday, 23 July 2023 at 17:35:03 UTC, Ruby The Roobster [SNIP] Thank you. I'm still trying to work out how it works. It seems as if the creator tried the same thing that I did, and then commented it out. Perhaps for the same reason? It is me who did it. I was getting some weirdly distorted images. And you see my final solution. I am writing on my mobil so cannot help you further. Ah. Anyhow, I fixed it. I had to use .scanline to fill the Image data, but in the end it worked. Thank you very much. Nice to hear that.
Re: Loading Textures in OpenGL
On Sunday, 23 July 2023 at 17:35:03 UTC, Ruby The Roobster wrote: On Sunday, 23 July 2023 at 17:02:40 UTC, Ferhat Kurtulmuş wrote: On Sunday, 23 July 2023 at 16:21:05 UTC, Ruby The Roobster wrote: I'm currently trying to load two textures and apply them to a rectangle, following [this](https://learnopengl.com/Getting-started/Textures) which is linked to from the README file of the bindbc OpenGL bindings. [...] DCV uses gamut for image input, and opengl for displaying stuff. You can take a look at the sources: https://github.com/libmir/dcv/blob/master/source/dcv/imageio/image.d#L399 https://github.com/libmir/dcv/blob/master/source/dcv/plot/drawprimitives.d#L126 Thank you. I'm still trying to work out how it works. It seems as if the creator tried the same thing that I did, and then commented it out. Perhaps for the same reason? It is me who did it. I was getting some weirdly distorted images. And you see my final solution. I am writing on my mobil so cannot help you further.
Re: Loading Textures in OpenGL
On Sunday, 23 July 2023 at 16:21:05 UTC, Ruby The Roobster wrote: I'm currently trying to load two textures and apply them to a rectangle, following [this](https://learnopengl.com/Getting-started/Textures) which is linked to from the README file of the bindbc OpenGL bindings. [...] DCV uses gamut for image input, and opengl for displaying stuff. You can take a look at the sources: https://github.com/libmir/dcv/blob/master/source/dcv/imageio/image.d#L399 https://github.com/libmir/dcv/blob/master/source/dcv/plot/drawprimitives.d#L126
Re: How to read live output from another process ?
On Friday, 23 June 2023 at 23:37:29 UTC, Vinod K Chandran wrote:
Hi all,
I am trying to create a program which burns time codes to a
video. I am using ffmpeg for this. So far, I can successfully
start ffmpeg in another thread and stop it when I need. But I
can't read the live outputs from ffmpeg. This is my code.
```d
void onBtnBurnClick(Control c, EventArgs e) {
if (!burnStarted) {
burnStarted = true;
btnBurn.text = "Stop Burning";
auto ffCmd = makeFFMPEGCommand(selVideo);
// ffPipe is a global ProcessPipes
auto tsk = task!runFFMPEG(ffCmd, , frm.handle);
tsk.executeInNewThread();
} else {
ffPipe.stdin.writeln("q");
ffPipe.stdin.close();
btnBurn.text = "Burn Time Code";
}
}
```
This is a button's click event.
I used something similar here:
https://github.com/aferust/oclcv/blob/main/examples/threshold-video/source/app.d
Re: How to setup dub project for contributing to a dub package?
On Friday, 23 June 2023 at 15:22:33 UTC, Ki Rill wrote:
Recently, I tried to set up `dcv` with `dub` to improve a few
things in the library, but I faced some strange issues.
[...]
I recommend adding DCV sub packages separately. Don't add the
entire thing to your dub dependencies. Just only add what you
need. Ffmpeg-d in only needed for DCV videoing. You can add
subpacks like:
"dependencies": {
"dcv:core": ...,
"dcv:plot": {"path": "../../"},
"dcv:imageio": {"path": "../../"},
"mir-random": "*"
}
Re: How to setup dub project for contributing to a dub package?
On Friday, 23 June 2023 at 15:52:44 UTC, Richard (Rikki) Andrew
Cattermole wrote:
First things first, dcv is added to the dub-registry, so use
this.
https://code.dlang.org/packages/dcv
```json
"dependencies": {
"dcv": "~>0.3.0"
}
```
For ffmpeg the binding tells you what to add for search paths
in the lflags directive.
https://github.com/ljubobratovicrelja/ffmpeg-d#adding-to-dub
All I can suggest is make sure you have the right dev packages
for ffmpeg installed and findable by the linker.
Just to make things clear,
I don't recommend to use DCV from dub registry, it's outdated. I
have an opinion that the docs should be updated before creating a
new version updating the dub repo. There are so many API changes
between the last dub repo version and the master repo. I don't
know if I will find time and motivation anytime soon. I doubt
someone else will do it too (it is a huge welcome though).
Re: pregunta preguntona, acerca de el resultado de remoteAddress()
On Wednesday, 14 June 2023 at 19:50:21 UTC, Danico wrote: que significa los ultimos numeros de 192.168.0.13:50732 , cuando hago un remoteAddress() y en un servidor socket? Es un numero de puerto. No estoy seguro que preguntar en un idioma otra que ingles es un buena idea aqui. Lee esto por favor: https://es.m.wikipedia.org/wiki/Puerta_de_enlace
Re: What's dxml DOMEntity(R) type ?
On Tuesday, 6 June 2023 at 14:16:37 UTC, Steven Schveighoffer
wrote:
On 6/5/23 6:43 AM, Ferhat Kurtulmuş wrote:
On Monday, 5 June 2023 at 10:01:01 UTC, John Xu wrote:
[...]
```d
import dxml.dom;
import std.stdio;
DOMEntity!string xmlRoot;
int main()
{
string xml = "";
auto dom = parseDOM(xml);
writeln(typeof(dom.children[0]).stringof); // yields
"DOMEntity!string"
xmlRoot = dom.children[0];
return 0;
}
```
In general, the easiset thing to do is use typeof, though it's
not always pretty (and not always obvious how to write it).
However, it's required for voldemort types.
```d
typeof(parseDom("")) DomEntity;
```
-Steve
İt is one of the nicest features of d. I believe it should not be
used too often because it may cause longer compilation times,
worse code reading, less comfort with d code scanners, editors
etcetera.
Re: What's dxml DOMEntity(R) type ?
On Monday, 5 June 2023 at 10:01:01 UTC, John Xu wrote:
The parseDOM returns a DOMEntity(R) type, how do I write a
xmlRoot as global variable?
I need its detailed type (auto / Variant doesn't work).
import dxml.dom;
?? xmlRoot;
int main() {
string xml = readText("a.xml");
auto dom = parseDOM(xml);
xmlRoot = dom.children[0];
}
```d
import dxml.dom;
import std.stdio;
DOMEntity!string xmlRoot;
int main()
{
string xml = "";
auto dom = parseDOM(xml);
writeln(typeof(dom.children[0]).stringof); // yields
"DOMEntity!string"
xmlRoot = dom.children[0];
return 0;
}
```
Re: what is the aftermath of dip74
On Wednesday, 10 May 2023 at 18:15:36 UTC, Richard (Rikki) Andrew Cattermole wrote: We do not, no. Reference counting is not currently in the language, although you can fake it with structs. Its a huge shame, but it should be added at some point because the compiler would tell the backend that it is possible to elide pair calls. However it'll have to wait for the DIP queue to reopen (slight process adjustment to make things easier is incoming). Thank you Rikki for the clarification. I think d need this without ugly workarounds.
Re: Getting a total from a user defined variable
On Thursday, 20 April 2023 at 19:41:21 UTC, Joel wrote:
```d
import std;
struct Person {
string name;
ulong age;
}
void main() {
auto p=[Person("Joel", 43), Person("Timothy", 40)];
writeln("Total: ", p.reduce!((a,b) => a.age+b.age)(0UL));
// how do I get the total of ages added together?
}
```
```d
import std;
struct Person {
string name;
ulong age;
}
void main() {
auto p=[Person("Joel", 43), Person("Timothy", 40)];
writeln("Total: ", p.map!(a => a.age).reduce!"a + b");
}
```
Re: Variable length arrays under -betterC?
On Tuesday, 18 April 2023 at 06:20:43 UTC, Richard (Rikki) Andrew Cattermole wrote: On 18/04/2023 1:33 PM, Salih Dincer wrote: I understand from the thread this: D gives us -betterC but nothing from the Phobos. So he says, see what you have, do what the hell you want! Am I wrong about this? Nope. -betterC means you have no runtime or standard library support. You are very much on your own. With betterC, some Phobos functionality work. For instance, most of std.range and std.algorithm will work. Problem is that there is no list of those in the docs. If something does GC allocations (std.container) or throws exceptions, it will not work. Based on my experience, -betterC, as its name implies, still provides a good programming experience rather than C.
Re: What do you think about using Chat GPT to create functions in D?
On Monday, 3 April 2023 at 23:38:52 UTC, Marcone wrote:
What do you think about using Chat GPT to create functions in
D? I asked Chat-GPT to create a function in D that was similar
to the rsplit() function in Python. It returned this code to me:
import std.algorithm;
import std.array;
import std.string;
string[] rsplit(string input, string separator, size_t maxsplit
= size_t.max) {
auto splitter = splitter(input, separator,
SplitterFlag.all);
auto results = splitter.array;
if (maxsplit < results.length - 1)
results = results[results.length - maxsplit - 1 .. $];
return results;
}
Recently, it helped me figure out an OpenGL task using d.
This is the code it suggests after I provide some details to
it about the case and the error I get:
```d
Slice!(RCI!ubyte, 3LU, Contiguous) plot2imslice() @nogc
nothrow
{
import mir.rc;
Slice!(RCI!ubyte, 3LU, Contiguous) imgslice =
rcslice!ubyte([height, width, 3], 0);
glfwMakeContextCurrent(_glfwWindow);
// create and bind framebuffer
GLuint fbo;
glGenFramebuffers(1, );
glBindFramebuffer(GL_FRAMEBUFFER, fbo);
// create and bind texture
GLuint texture;
glGenTextures(1, );
glBindTexture(GL_TEXTURE_2D, texture);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, width, height, 0,
GL_RGB, GL_UNSIGNED_BYTE, null);
glFramebufferTexture2D(GL_FRAMEBUFFER,
GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, texture, 0);
// render scene to framebuffer
glBindFramebuffer(GL_FRAMEBUFFER, fbo);
// render your scene here
// read pixel data from framebuffer
glReadPixels(0, 0, width, height, GL_RGB,
GL_UNSIGNED_BYTE, imgslice.ptr);
// flip image vertically
for (size_t y = 0; y < height / 2; y++) {
for (size_t x = 0; x < width; x++) {
// swap rows
swap(imgslice[y][x], imgslice[height - y - 1][x]);
}
}
// unbind framebuffer and cleanup
glBindFramebuffer(GL_FRAMEBUFFER, 0);
glDeleteTextures(1, );
glDeleteFramebuffers(1, );
return imgslice;
}
```
And this is the code after required modifications:
```d
auto plot2imslice() @nogc nothrow
{
import mir.rc;
Slice!(RCI!ubyte, 3LU, Contiguous) imgslice =
rcslice!ubyte([height, width, 3], 0);
glfwMakeContextCurrent(_glfwWindow);
// create and bind framebuffer
GLuint fbo;
glGenFramebuffers(1, );
glBindFramebuffer(GL_FRAMEBUFFER, fbo);
// create and bind texture
GLuint texture;
glGenTextures(1, );
glBindTexture(GL_TEXTURE_2D, texture);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, width, height,
0, GL_RGB, GL_UNSIGNED_BYTE, null);
glFramebufferTexture2D(GL_FRAMEBUFFER,
GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, texture, 0);
// render scene to framebuffer
glBindFramebuffer(GL_FRAMEBUFFER, fbo);
// render scene here
render();
// read pixel data from framebuffer
glReadPixels(0, 0, width, height, GL_RGB,
GL_UNSIGNED_BYTE, imgslice.ptr);
import mir.utility : swap;
// flip image vertically to correct generated image
foreach (y; 0..height / 2) {
each!swap(imgslice[y], imgslice[height - y - 1]);
}
// unbind framebuffer and cleanup
glBindFramebuffer(GL_FRAMEBUFFER, 0);
glDeleteTextures(1, );
glDeleteFramebuffers(1, );
return imgslice;
}
```
This comment of chatGPT saved the day :) // render your scene here
Re: better video rendering in d
On Tuesday, 21 March 2023 at 17:46:00 UTC, H. S. Teoh wrote: On Tue, Mar 21, 2023 at 05:29:22PM +, monkyyy via Digitalmars-d-learn wrote: On Tuesday, 21 March 2023 at 17:18:15 UTC, H. S. Teoh wrote: > [...] I vaguely remember an hour and half for 5 minutes of video when its extremely lightweight and raylib trivially does real-time to display it normally and realistically I wouldn't be surprised if it could do 1000 frames a second. Coping several gb of data to disk(that probably asking the gpu one pixel at a time) to be compressed down into a dozen mb of video is just... temp shit. I should just do something that isnt stressing hard drives extremely unnecessarily. You could try to feed the frames to ffmpeg over stdin instead of storing the frames on disk. See this, for example: https://stackoverflow.com/questions/45899585/pipe-input-in-to-ffmpeg-stdin Then you can just feed live data to it in the background while you generate frames in the foreground. T This is how I use pipe process with d and ffmpeg. I am reading video frames but other way may work too. https://github.com/aferust/oclcv/blob/main/examples/rgb2gray-video/source/app.d
Re: compile: link dynamic OR static library in Windows
On Saturday, 4 February 2023 at 15:52:33 UTC, Alexander Zhirov wrote: PS C:\sources\pxe-restore\source> dmd -i app.d -LC:\msys64\home\user\postgresql-15.1\installed\mingw64\lib\libpq.dll lld-link: error: C:\msys64\home\user\postgresql-15.1\installed\mingw64\lib\libpq.dll: bad file type. Did you specify a DLL instead of an import library? lld-link: error: could not open 'pq.lib': no such file or directory Error: linker exited with status 1 through a simple `dmd`? On Windows, dub's default behavior is to search for "foo.lib", usually compiled with Visual Studio C/C++ compilers. However, you have mingw-compiled "libfoo.a". I would not use MinGW-compiled libs with d compilers. I don't know how d compilers improved to support it, but in the past, I experienced ABI compatibility issues with d and MinGW. I took a quick look at https://www.postgresql.org/download/. When I tried to download, I saw that the archive contained *.lib files. So, why don't you use them? you will also need definitions of the functions in your d code like `extern(C) void fooDB();`. I am not sure how [importC](https://dlang.org/spec/importc.html) is usable with PostgreSQL. In addition, there are some bindings in the dub registry https://code.dlang.org/search?q=PostgreSQL.
Re: Are there some helpers in Phobos equivalent to std::set_difference of ugly c++
On Friday, 3 February 2023 at 15:53:35 UTC, Richard (Rikki)
Andrew Cattermole wrote:
```d
import std.stdio, std.algorithm.setops, std.array;
void main() {
int[] v1 = [1, 2, 5, 5, 5, 9];
int[] v2 = [2, 5, 7];
int[] v3 = setDifference(v1, v2).array;
writefln!"%s \\ %s = %s"(v1, v2, v3);
}
```
[1, 2, 5, 5, 5, 9] \ [2, 5, 7] = [1, 5, 5, 9]
Thank you very much. I am surprised that I couldn't find it using
many keywords on the site and google.
Are there some helpers in Phobos equivalent to std::set_difference of ugly c++
I could not find a thing doing this. And I don't want to write it
from scratch. Getting a range as output is ok too. What I need is
the following:
```c++
const std::vector v1{1, 2, 5, 5, 5, 9};
const std::vector v2{2, 5, 7};
std::vector diff;
std::set_difference(v1.begin(), v1.end(), v2.begin(),
v2.end(),
std::inserter(diff, diff.begin()));
print(v1, "∖ ");
print(v2, "= ");
print(diff, "\n");
// yielding { 1 2 5 5 5 9 } ∖ { 2 5 7 } = { 1 5 5 9 }
```
Re: Graphical progressive fill
On Sunday, 11 December 2022 at 06:50:44 UTC, Joel wrote: I've been trying to fill in areas with a colour but can't work it out. I want something like the effect where it fills with diamonds. Not all at once but building up in the main program loop. # # # # # # # # # # # # # # # # # #### # # # # # ## # # #### # # # # ### # ## # https://rosettacode.org/wiki/Bitmap/Flood_fill
Re: Allocate a string via the GC
On Monday, 23 May 2022 at 09:38:07 UTC, JG wrote: Hi, Is there any more standard way to achieve something to the effect of: ```d import std.experimental.allocator; string* name = theAllocator.make!string; ``` Pointers are not used for strings in d. string is an alias for immutable(char)[]. So, you can do: ```d import std.exception : assumeUnique; // makes char[] immutable string str = (new char[15]).assumeUnique; str = "hmm. my string!"; ``` a slice in d (e.g. char[]) is roughly considered as a struct with a pointer and length. I also suspect that your question is not that simple, maybe you really need a string pointer, and I couldn't understand what you are actually asking. I am sorry if those are not what you were looking for the answers to. Here is how you GC allocate a pointer to a string. ```d string* strptr = new string[1].ptr; // Since slices are reference types just use this instead: string[] strptr = new string[1]; ``` Maybe you need a pointer to the first char of a string then: ```d string str; // allocated somehow immutable(char)* chr = str.ptr; ```
Re: I need some help for my DCV update
On Saturday, 27 November 2021 at 11:35:21 UTC, Salih Dincer wrote: I also found similar errors but couldn't solve them. I think it has to do with mir.slice.kind. Exactly Kind Topology... I won't use parallel for it as a workaround until it is solved in the mir-algorithm.
Re: I need some help for my DCV update
On Friday, 26 November 2021 at 09:16:56 UTC, Ferhat Kurtulmuş
wrote:
I am working on the DCV to make it compilable with the recent
versions of LDC, mir libraries, and stuff. I have not yet
simply forked it to work on it. I am including modules one by
one for my convenience instead. Hope, I am close to the end.
Here is my temporary repo:
https://github.com/aferust/ddcv
After dealing with, various problems, it turns out the main
problem was ndiota with pool.parallel.
https://github.com/aferust/ddcv/blob/main/source/dcv/imgproc/filter.d#L564
```
foreach (row; /*pool.parallel(*/ndiota(input.shape)/*)*/) //
parallel loop causes a linker error
{
row.each!(i => calcGradientsImpl(fx[i], fy[i], mag[i],
orient[i]));
}
```
The parallel loop causes a linker error here?
error LNK2019: unresolved external symbol
_D3mir7ndslice5slice__T9mir_sliceTSQBhQBg8iterator__T13FieldIteratorTSQCqQCp5field__T11ndIotaFieldVmi2ZQsZQCbVmi1VEQEjQEiQEd14mir_slice_kindi2ZQEq__T10lightScopeZQnMxFNaNbNdNiNfZSQGvQGuQGp__TQGmTQGfVmi1VQDli2ZQHe referenced in function _D3mir7ndslice5slice__T9mir_sliceTSQBhQBg8iterator__T13FieldIteratorTSQCqQCp5field__T11ndIotaFieldVmi2ZQsZQCbVmi1VEQEjQEiQEd14mir_slice_kindi2ZQEq__T8opEqualsTQEvVQBxi2ZQuMxFNaNbNiNeKxSQHbQHaQGv__TQGsTQGlVmi1VQDri2ZQHkZb
.dub\build\application-debug-windows-x86_64-ldc_v1.28.0-24645713CE34BFE817BFD3D964187D0E\ddcv.exe
: fatal error LNK1120: 1 unresolved externals
Re: I need some help for my DCV update
On Friday, 26 November 2021 at 09:31:42 UTC, drug wrote: On 26.11.2021 12:16, Ferhat Kurtulmuş wrote: InputTensor = Slice!(ubyte*, 2LU, mir_slice_kind.contiguous) and KernelTensor = Slice!(float*, 2LU, mir_slice_kind.contiguous). The key argument of slices is a pointee type - InputTensor pointee has ubyte type and KernelTensor has float. I'm not sure this solves your problem but at least I'd start from here. Yes, but this is how the original code was written.
I need some help for my DCV update
I am working on the DCV to make it compilable with the recent
versions of LDC, mir libraries, and stuff. I have not yet simply
forked it to work on it. I am including modules one by one for my
convenience instead. Hope, I am close to the end. Here is my
temporary repo:
https://github.com/aferust/ddcv
I run into some problems with module convolution, especially the
function conv invoked by the below code which calls canny edge
filter:
```
Image image = imread("lena.png");
auto slice = image.sliced.rgb2gray;
//auto equalized =
slice.histEqualize(slice.flattened.calcHistogram);
slice.asImage.imshow("Original");
auto edge = slice.canny!ubyte(15);
edge.asImage.imshow("edge");
waitKey();
```
Somehow, the compiler fails in deducting the types. I need some
help from Ilya or other people familiar with mir.ndslice.
To reproduce it, download my repo and try to compile it as it is.
There is a main with the test code in the repo. Just be sure you
have a glfw3.dll/.so.
```
source\dcv\imgproc\filter.d(547,18): Error: template
`dcv.imgproc.convolution.conv` cannot deduce function from
argument types `!()(Slice!(ubyte*, 2LU,
mir_slice_kind.contiguous), Slice!(float*, 2LU,
mir_slice_kind.contiguous), Slice!(float*, 2LU,
mir_slice_kind.contiguous), Slice!(float*, 2LU,
mir_slice_kind.contiguous), TaskPool)`
source\dcv\imgproc\filter.d(548,18): Error: template
`dcv.imgproc.convolution.conv` cannot deduce function from
argument types `!()(Slice!(ubyte*, 2LU, mir_sut, KernelTensor
kerlice_kind.contiguous), Slice!(float*, 2LU,
mir_slice_kind.contiguous), Slice!(float*, 2LU,
mir_slice_kind.contiguous), Slice!(float*, 2LU,
mir_slice_kind.contiguous), TaskPool)`
lice_kind.contiguous
source\dcv\imgproc\convolution.d(78,13):Candidate is:
`conv(alias bc = neumann, InputTensor, KernelTensor, MaskTensor =
KernelTensor)(InputTensor input, KernelTensor kernel, InputTensor
prealloc = InputTensor.init, MaskTensor mask = MaskTensor.init,
TaskPool pool = taskPool)` ut,
KernelTensor ker
source\dcv\imgproc\filter.d(674,18): Error: template instance
`dcv.imgproc.filter.calcGradients!(Slice!(ubyte*, 2LU,
mir_slice_kind.contiguous), float)` error instantiating
r instantiating
source\dcv\imgproc\filter.d(694,24):instantiated from
here: `canny!(ubyte, ubyte, mir_slice_kind.contiguous)`
source\app.d(48,34):instantiated from here:
`canny!(ubyte, ubyte, mir_slice_kind.contiguous)`
```
I tried explicitly passing template parameters in
dcv.imgproc.filter.calcGradients like below, but in that way, I
am getting some other compilation errors:
```
alias Empty2Type = Slice!(V*, 2LU, SliceKind.contiguous);
fx = input.conv(neumann, typeof(input), Empty2Type, Empty2Type)
(kx, emptySlice!(2LU, V), emptySlice!(2LU, V), pool);
fy = input.convinput.conv(neumann, typeof(input), Empty2Type,
Empty2Type)
(ky, emptySlice!(2LU, V), emptySlice!(2LU, V), pool);
```
Thanks in advance!
Re: I need some help for my DCV update
On Friday, 26 November 2021 at 09:16:56 UTC, Ferhat Kurtulmuş wrote: I am working on the DCV to make it compilable with the recent versions of LDC, mir libraries, and stuff. I have not yet simply forked it to work on it. I am including modules one by one for my convenience instead. Hope, I am close to the end. Here is my temporary repo: [...] Upps alias Empty2Type = Slice!(V*, 2LU, SliceKind.contiguous); fx = input.conv!(neumann, typeof(input), Empty2Type, Empty2Type) (kx, emptySlice!(2LU, V), emptySlice!(2LU, V), pool); fy = input.conv!(neumann, typeof(input), Empty2Type, Empty2Type) (ky, emptySlice!(2LU, V), emptySlice!(2LU, V), pool);
Re: Data conversion
On Tuesday, 16 November 2021 at 19:44:04 UTC, Ferhat Kurtulmuş wrote: On Tuesday, 16 November 2021 at 19:18:50 UTC, pascal111 wrote: [...] sscanf of C is an option where you cannot use to!T. However, it is a c library function, and it doesn't throw an exception on unexpected inputs. https://dlang.org/library/core/stdc/stdio/scanf.html https://www.tutorialspoint.com/c_standard_library/c_function_sscanf.htm Upps https://dlang.org/library/core/stdc/stdio/sscanf.html
Re: Data conversion
On Tuesday, 16 November 2021 at 19:18:50 UTC, pascal111 wrote:
I used "to" keyword which "std.conv" includes for data
conversions, but I think that there are some other ways for
data conversions, or maybe there are common ways like casting,
I hope to know about. For example, next program are using "to":
// D programming language
import std.stdio;
import std.conv;
import std.string;
int main()
{
char[] s;
int x=0, e;
do{
try{
e=1;
write("Enter a numeric value: ");
readln(s);
s=strip(s);
x=to!int(s);}
catch (Exception err){
stderr.writefln!"Warning! %s"(err.msg);
e=0;}
}while(!e);
writeln("Correct numeric value!");
return 0;
}
sscanf of C is an option where you cannot use to!T. However, it
is a c library function, and it doesn't throw an exception on
unexpected inputs.
https://dlang.org/library/core/stdc/stdio/scanf.html
https://www.tutorialspoint.com/c_standard_library/c_function_sscanf.htm
Re: Crosscompile to Windows
On Friday, 5 November 2021 at 18:11:35 UTC, Luis wrote: There is a obvious way to crosscompile a dub project to Windows from a Linux dev machine ? I don't know if it is possible with dmd. But with LDC you can use mtriple. https://wiki.dlang.org/Cross-compiling_with_LDC
Re: I need a detailed document about druntime.
On Monday, 11 October 2021 at 15:24:07 UTC, Adam D Ruppe wrote: On Monday, 11 October 2021 at 15:18:11 UTC, Ferhat Kurtulmuş wrote: "Each call to initialize must be paired by a call to terminate.' It is so the refcount works out. When you call initialize, it does something like: if(refcount == 0) actually intialize; // calls constructors etc refcount++; When you call terminate, it does: refcount--; if(refcount == 0) actually terminate; // calls destructors etc If you don't pair it, the refcount will be off, so the next call to terminate will still see ref > 0 and not actually terminate. The D main inserts a call to init before main and a call to terminate after main automatically. That makes sense, now I see, thank you again Adam.
Re: I need a detailed document about druntime.
On Monday, 11 October 2021 at 15:09:12 UTC, Adam D Ruppe wrote: On Monday, 11 October 2021 at 14:56:19 UTC, Ferhat Kurtulmuş wrote: What I want is to bypass runtime initialization if it is already initialized. That what it does by itself, you can call it and it has an internal count. Thank you for your response. But this confuses me: "Each call to initialize must be paired by a call to terminate.' https://dlang.org/library/core/runtime/runtime.initialize.html
I need a detailed document about druntime.
I want to know what happens if either Runtime.initialize or
terminate is called without matching each other. And why there is
no ready-to-use thing like initCount which is accessible in the
code? What I want is to bypass runtime initialization if it is
already initialized. The below code is my workaround, but it can
only keep track of my initializations, not the one that
automatically get fired where there is a dmain.
Should İ use "bool runMain" to differentiate between the
compilations of dll and executable?
```d
private {
import core.runtime;
import core.atomic;
shared size_t initCount;
void initRT(){
if(!atomicLoad!(MemoryOrder.acq)(initCount)){
Runtime.initialize();
atomicOp!"+="(initCount, 1);
}
}
void termRT(){
if(atomicLoad!(MemoryOrder.acq)(initCount) > 0){
Runtime.terminate();
atomicOp!"-="(initCount, 1);
}
}
}
```
Re: Template mixin problem with EnumMembers
On Saturday, 2 October 2021 at 22:24:56 UTC, Adam Ruppe wrote: On Saturday, 2 October 2021 at 22:07:23 UTC, Ferhat Kurtulmuş wrote: [...] You used .stringof. That's undefined behavior. Never use stringof. (except for debugging writes) [...] Thank you Adam! I should stop using stringof. Even the docs say it, I ve just seen that https://dlang.org/spec/property.html#stringof. Probably, I will go for your second solution. I appreciate it.
Template mixin problem with EnumMembers
The below code works as expected on https://run.dlang.io/, but
not on my computer. And I don't know why?
I want to access enum members like Options.OUT_FILE_NAME instead
of Options.StringOption.OUT_FILE_NAME.
Please note that the solutions like "alias something = int;"
don't work for me. that is not what I need.
In my local computer, pragma(msg, fullname) outputs like:
cast(StringOption)0
cast(StringOption)1
cast(StringOption)2
some error messages I get:
...\options.d-mixin-86(86,11): Error: declaration expected, not )
...\options.d-mixin-86(86,11): Error: no identifier for
declarator tion
```d
import std.stdio;
class Options{
public:
enum StringOption {
OUT_FILE_NAME,
RPT_FILE_NAME,
MAP_FILE_NAME
}
import std.traits: EnumMembers;
mixin template StrOptAliases()
{
static foreach(fullname; [EnumMembers!(StringOption)]){
mixin("alias " ~ fullname.stringof[13..$] ~ " = " ~
"Options." ~
fullname.stringof ~ ";\n");
pragma(msg, fullname);
}
}
mixin StrOptAliases;
}
void main()
{
int opt = Options.OUT_FILE_NAME;
writeln(opt);
}
```
Re: How to do "C++ classes"?
On Monday, 20 September 2021 at 15:56:44 UTC, Ferhat Kurtulmuş wrote: On Monday, 20 September 2021 at 15:45:08 UTC, Adam D Ruppe wrote: On Monday, 20 September 2021 at 15:35:02 UTC, Ferhat Kurtulmuş wrote: I thought it's stack-allocated and scoped. It is. But when I try to return a class instance from a function, it still works? dmd only makes that an error if you specify `@safe` and i think `-dip1000`. Try adding one or both of those and recompiling and see what happens. Note that even if the compiler doesn't error on it, it is undefined behavior to return the stack reference so be sure to treat it right. That is what I thought too. I only tried this on the online compiler. Thank you. Have a great day or night captain. I also think this is a dirty corner of the complier since it must raise an error for scoped instances of classes.
Re: How to do "C++ classes"?
On Monday, 20 September 2021 at 15:45:08 UTC, Adam D Ruppe wrote: On Monday, 20 September 2021 at 15:35:02 UTC, Ferhat Kurtulmuş wrote: I thought it's stack-allocated and scoped. It is. But when I try to return a class instance from a function, it still works? dmd only makes that an error if you specify `@safe` and i think `-dip1000`. Try adding one or both of those and recompiling and see what happens. Note that even if the compiler doesn't error on it, it is undefined behavior to return the stack reference so be sure to treat it right. That is what I thought too. I only tried this on the online compiler. Thank you. Have a great day or night captain.
Re: How to do "C++ classes"?
On Saturday, 18 September 2021 at 22:16:32 UTC, Adam D Ruppe
wrote:
On Saturday, 18 September 2021 at 15:38:38 UTC, rempas wrote:
I'm seeing in the page about "BeterC" and in the part about
the [retained
features](https://dlang.org/spec/betterc.html#retained), the
#11 says about "COM classes and C++ classes". What are the
"C++ classes"? I tried to create a class using "extern(C++)"
but this didn't worked. Can someone make an example on that?
extern(C++)
class Foo {}
void main() {
scope Foo foo = new Foo();
}
I thought it's stack-allocated and scoped. But when I try to
return a class instance from a function, it still works? Captain
Adam I need an explanation please.
Re: How to simply parse and print the XML with dxml?
On Thursday, 9 September 2021 at 17:17:23 UTC, tastyminerals wrote: Maybe I missed something obvious in the docs but how can I just parse the XML and print its content? ``` import dxml.parser; auto xml = parseXML!simpleXML(layout); xml.map!(e => e.text).join.writeln; ``` throws `core.exception.AssertError@../../../.dub/packages/dxml-0.4.3/dxml/source/dxml/parser.d(1457): text cannot be called with elementStart`. I am not fully experienced with it, but once I used it for reading glade files [1]. I used dxml.dom. Hope it helps. 1: https://github.com/aferust/makegtkdclass/blob/master/source/gladeparser.d#L43
Re: foreach() behavior on ranges
On Tuesday, 24 August 2021 at 19:06:44 UTC, Alexandru Ermicioi wrote: On Tuesday, 24 August 2021 at 09:15:23 UTC, bauss wrote: [...] Actually the range contracts don't mention that it needs to be a by value type. It can also be a reference type, i.e. a class. [...] True for any forward range and above, not true for input ranges. The problem with them is that some of them are structs, and even if they are not forward ranges they do have this behavior due to implicit copy on assignment, which can potentially make the code confusing. [...] If we follow the definition of ranges, they must not be copy-able at all. The only way to copy/save, would be to have .save method and call that method. This again is not being properly followed by even phobos implementations. Note, that a better approach would be to replace .save in definition of forward range with a copy constructor, then all non-compliant ranges would become suddenly compliant, while those that have .save method should be refactored to a copy constructor version. [...] You should add .save on assignment if range is a forward range, or just remove the assignment if it is not. Best regards, Alexandru. Just out of curiosity, if a range implementation uses malloc in save, is it only possible to free the memory with the dtor? I worry about that especially when using those nogc range implementations with standard library. I don't have a list of the functions calling save in phobos. Is a save function only meaningful for GC ranges?
Re: How to get element type of a slice?
On Saturday, 21 August 2021 at 02:59:39 UTC, Jesse Phillips wrote:
On Thursday, 19 August 2021 at 04:03:31 UTC, jfondren wrote:
On Thursday, 19 August 2021 at 03:32:47 UTC, Jesse Phillips
wrote:
On Tuesday, 17 August 2021 at 12:33:03 UTC, Ferhat Kurtulmuş
wrote:
Hey, thank you again but, I don't want an instance of
Point[] I need:
alias T = Point[];
alias ElementOfPointSlice = // element type of T
so, what's the problem? This passes tests:
```d
import std.range : ElementType;
struct Point { int x, y; }
alias T = Point[];
alias ElementOfPointSlice = ElementType!(T);
unittest {
assert(is(ElementOfPointSlice == Point));
}
```
No issue just trying to give Ferhat a final answer to his
question.
Thank you. I appreciate it.
Re: How to call destructor before free without dropping @nogc?
On Thursday, 19 August 2021 at 15:38:19 UTC, evilrat wrote:
On Thursday, 19 August 2021 at 15:12:03 UTC, Ferhat Kurtulmuş
Btw, based on
https://github.com/dlang/druntime/blob/master/src/object.d#L4209:
import core.lifetime;
import core.stdc.stdio;
import core.stdc.stdlib;
extern (C) void rt_finalize(void *data, bool det=true) @nogc
nothrow; // cheap hack here
alias destroy = rt_finalize;
class SomeClass
{
int a = 42;
this() @nogc { }
~this() @nogc {printf("nogc\n");}
this(int val) @nogc { a = val; }
}
@nogc void main()
{
SomeClass dynAlloc = cast(SomeClass)
malloc(__traits(classInstanceSize, SomeClass));
dynAlloc = emplace!SomeClass(dynAlloc, 123);
printf("dynamic %d\n", dynAlloc.a); // 123
//rt_finalize(cast(void*)dynAlloc);
destroy(cast(void*)dynAlloc); // cast needed :/ dunno
consequences though
}
Re: How to call destructor before free without dropping @nogc?
On Thursday, 19 August 2021 at 15:38:19 UTC, evilrat wrote: On Thursday, 19 August 2021 at 15:12:03 UTC, Ferhat Kurtulmuş This is cool, but even in unit tests for malloc wrapper there is only simple case with class without references to another class and no dtor. If you examine the entire library, there are various use cases of nogc classes. For instance, a derived class containing references to other class objects [1]. I am not using classes heavily with D. I just once happily used dplug's nogc facilities. When I saw this thread, I just wanted to share it here. Seems like the issue is that one have to add @nogc constructor/destructor overloads for emplace/destroy, and the author can't have @nogc dtor because of writeln (IIRC @nogc using GC is allowed with `debug` anyway), and all class members of another classes must recursively provide them as well. I agree with you. D needs more nogc facilities for OOP. It would not be so hard to include those overloads. Probably, this would violate the strictly defended safety principles of D? [1]: https://github.com/AuburnSounds/Dplug/blob/f67c14fd5ba44225d6669e87f942d641c8bf8ab8/window/dplug/window/cocoawindow.d
Re: How to call destructor before free without dropping @nogc?
On Thursday, 19 August 2021 at 07:30:38 UTC, Bienlein wrote: Hello, I allocate some instance of class C manually and then free the memory again: [...] I just wanted to leave this here. https://github.com/AuburnSounds/Dplug/blob/master/core/dplug/core/nogc.d
Re: How to get element type of a slice?
On Tuesday, 17 August 2021 at 13:14:44 UTC, Steven Schveighoffer
wrote:
On 8/17/21 8:21 AM, Ferhat Kurtulmuş wrote:
Hello folks,
Hope everyone is doing fine. Considering the following code,
in the first condition, I am extracting the type Point from
the slice Point[]. I searched in the std.traits, and could not
find a neater solution something like ElementTypeOf!T. Is
there any neater solution for it? Thanks in advance.
```d
static if (isArray!VecPoint){
VecPoint dummy;
alias Point = typeof(dummy[0]);
} else static if (isRandomAccessRange!VecPoint){
alias ASeq2 = TemplateArgsOf!VecPoint;
alias Point = ASeq2[0];
} else
static assert(0, typeof(VecPoint).stringof ~ " type
is not supported");
```
If you want the element type of a range (i.e. the thing
returned by `range.front`), you can use `ElementType!T` (from
std.range.primitives).
This returns the element type of the range, which for every
array *except* character arrays, gives you the element type of
the array.
If you want always the element type of the array, even for
auto-decoded ranges, use `ElementEncodingType!T`.
If you know it's an array, you can just use Paul's solution.
Your `isRandomAccessRange` branch seems very suspect.
-Steve
Very informative, thanks. My code is lying here[1]. I want my
struct to accept 2d static arrays, random access ranges, and
"std.container.Array". I could achieve it with its present form,
and I will probably slightly modify it based on your comments.
[1]:
https://github.com/aferust/earcut-d/blob/master/source/earcutd.d#L34
Re: How to get element type of a slice?
On Tuesday, 17 August 2021 at 12:49:02 UTC, drug wrote: 17.08.2021 15:21, Ferhat Kurtulmuş пишет: [...] https://dlang.org/library/std/range/primitives/element_type.html Yes, that is neat. Thank you.
Re: How to get element type of a slice?
On Tuesday, 17 August 2021 at 12:32:45 UTC, Paul Backus wrote: On Tuesday, 17 August 2021 at 12:21:31 UTC, Ferhat Kurtulmuş wrote: Hello folks, Hope everyone is doing fine. Considering the following code, in the first condition, I am extracting the type Point from the slice Point[]. I searched in the std.traits, and could not find a neater solution something like ElementTypeOf!T. Is there any neater solution for it? Thanks in advance. `typeof(T.init[0])` Note that `std.range.ElementType` will probably not give the result you expect for character arrays (such as `char[]` and `wchar[]`), due to autodecoding. Thank you. This one looks better.
Re: How to get element type of a slice?
On Tuesday, 17 August 2021 at 12:26:36 UTC, jfondren wrote:
On Tuesday, 17 August 2021 at 12:21:31 UTC, Ferhat Kurtulmuş
wrote:
[...]
This one's not in std.traits:
```d
import std.range : ElementType;
struct Point { int x, y; }
unittest {
Point[] points;
assert(is(ElementType!(typeof(points)) == Point));
}
```
Hey, thank you again but, I don't want an instance of Point[] I
need:
alias T = Point[];
alias ElementOfPointSlice = // element type of T
Re: How to get element type of a slice?
On Tuesday, 17 August 2021 at 12:26:36 UTC, jfondren wrote:
On Tuesday, 17 August 2021 at 12:21:31 UTC, Ferhat Kurtulmuş
wrote:
[...]
This one's not in std.traits:
```d
import std.range : ElementType;
struct Point { int x, y; }
unittest {
Point[] points;
assert(is(ElementType!(typeof(points)) == Point));
}
```
Awesome! Have a great day.
How to get element type of a slice?
Hello folks,
Hope everyone is doing fine. Considering the following code, in
the first condition, I am extracting the type Point from the
slice Point[]. I searched in the std.traits, and could not find a
neater solution something like ElementTypeOf!T. Is there any
neater solution for it? Thanks in advance.
```d
static if (isArray!VecPoint){
VecPoint dummy;
alias Point = typeof(dummy[0]);
} else static if (isRandomAccessRange!VecPoint){
alias ASeq2 = TemplateArgsOf!VecPoint;
alias Point = ASeq2[0];
} else
static assert(0, typeof(VecPoint).stringof ~ " type is
not supported");
```
Ferhat
Re: Can I make system calls directly from D?
On Friday, 9 July 2021 at 08:08:57 UTC, rempas wrote: I just wonder if I'm able to do system calls directly from D or If I have to create bindings from "unistd.h" from C I don't know if it covers what you want but, druntime has those definitions: https://github.com/dlang/druntime/blob/master/src/core/sys/posix/unistd.d import core.sys.posix.unistd; ... do stuff
Re: Trivial simple OpenGl working example
On Friday, 9 July 2021 at 06:16:08 UTC, Ferhat Kurtulmuş wrote: On Friday, 9 July 2021 at 05:17:28 UTC, Виталий Фадеев wrote: [...] [...] Dear Vitaly (Google translates it like that :)), I didn't touch that game for a while. I have just tried to compile and those are the steps to build and run it: [...] You may also need to use the exact version of "bettercmath": "0.3.1".
Re: Trivial simple OpenGl working example
On Friday, 9 July 2021 at 05:17:28 UTC, Виталий Фадеев wrote: On Thursday, 8 July 2021 at 17:20:14 UTC, Ferhat Kurtulmuş wrote: On Thursday, 8 July 2021 at 13:51:51 UTC, Виталий Фадеев wrote: Hi! Each ends with error. Dear Vitaly (Google translates it like that :)), I didn't touch that game for a while. I have just tried to compile and those are the steps to build and run it: Using a Windows 10 x64. (Webassembly build needs crazy efforts, don't try it for now. If you are on a posix system please delete *.a folders from the root folder because they are for webassembly) 1) Open the dub.json or dub.selections.json, and change "bcaa": "~>0.0.5" to "bcaa": "0.0.5" (Recently a contributor and I have made some breaking changes in bcaa). 2) Have those lib and dll files in the root folder of the project: chipmunk.lib // I manually compiled this one libfreetype-6.dl libjpeg-9.dll libpng16-16.dll libtiff-5.dll libwebp-7.dll SDL2_image.dll SDL2_image.lib SDL2_ttf.dll SDL2_ttf.lib SDL2.dll SDL2.lib zlib1.dll basically, those are win 64-bit builds of SDL2, its friends, and their dependencies. If you provide an email, I can send them to you via wetransfer. For posix builds, you will have to figure those out.
Re: Trivial simple OpenGl working example
On Thursday, 8 July 2021 at 13:51:51 UTC, Виталий Фадеев wrote: Hi! I searching trivial simple D/OpenGL working in 2021 year example. It may be triangle. It may be based on any library: SDL, GLFW, Derelict, etc. Can you help me ? this one of mine [1] was very simple in the beginning. It even runs on browser now. [1] https://github.com/aferust/drawee
Re: How to use a shared library created in cython?
On Sunday, 11 April 2021 at 20:08:15 UTC, affonso elias ferreira junior wrote: Hi everyone, I'm trying to use a shared library created in Cython. example. [...] I am on my mobile phone, and cannot reproduce. But i see that this cast(int function()) should be cast(int function(int)). Try correcting function signatures throughout the code. And extern (c) int test() is irrelevant here because you are loading it via a different mechanism.
Re: Creating a .di file for a custom C library
On Tuesday, 30 March 2021 at 04:01:12 UTC, Brad wrote: I would like to use an updated version of the Termbox library (written in C) with D. I have the .h file. This is new territory for me (why try something easy - right?). I think I need to create a .di file that corresponds to the .h file. I also suspect that I need to put the library file (C code) into the project as a file somehow. I am probably just not looking in the right place for the documentation, but I cannot seem to find a lot of guidance in this area. Thanks in advance. I never needed or used .di files. Dstep[1] can create d modules containing c header definitions. Recently, I used to create a d binding [2] for shapelib[3]. I just added "module shapelib;" at the beginning of the file, nothing else. Some c headers may require extra steps IMO. 1: https://github.com/jacob-carlborg/dstep 2: https://github.com/aferust/shapelib-d/blob/main/shapelib.d 3: https://github.com/OSGeo/shapelib
Re: Creating 1000 instances
On Friday, 19 February 2021 at 10:02:05 UTC, Siemargl wrote: On Friday, 19 February 2021 at 08:29:36 UTC, Ferhat Kurtulmuş wrote: Since classes are reference types all instances of files will be the same reference of "new File()", which you probably don't want. Is any differences between x and y definitions? MyClass [] x, y; x = new MyClass[7]; y= new MyClass[](8); Although I don't usually use the latter, I can say online d editor yields the same ASM output for both: File[] files = new File[10]; File[] files = new File[](10);
Re: Creating 1000 instances
On Friday, 19 February 2021 at 08:29:36 UTC, Ferhat Kurtulmuş wrote: On Friday, 19 February 2021 at 08:04:19 UTC, Виталий Фадеев wrote: [...] files = new File[]( 1000 ); files[] = new File(); // add this Since classes are reference types all instances of files will be the same reference of "new File()", which you probably don't want. You can do files[].each!((ref a) => a = new File);
Re: Creating 1000 instances
On Friday, 19 February 2021 at 08:41:06 UTC, Ferhat Kurtulmuş wrote: On Friday, 19 February 2021 at 08:29:36 UTC, Ferhat Kurtulmuş wrote: On Friday, 19 February 2021 at 08:04:19 UTC, Виталий Фадеев wrote: [...] files = new File[]( 1000 ); files[] = new File(); // add this Since classes are reference types all instances of files will be the same reference of "new File()", which you probably don't want. You can do files[].each!((ref a) => a = new File); oh, now we can remove brackets files.each!((ref a) => a = new File);
Re: Creating 1000 instances
On Friday, 19 February 2021 at 08:04:19 UTC, Виталий Фадеев wrote:
We have:
class File
{
// WIN32_FIND_DATAW data;
}
void fastReadDir()
{
File[] files;
// reserve space, allocating instances
files = new File[]( 1000 ); // <--- trouble here ?
// filling instances
auto file = files.ptr;
writeln( file.data );// <--- or trouble here ?
// ...
}
Got:
SegFault
Goal:
Allocate memory for 1000 instances at once.
Source:
https://run.dlang.io/is/xfaXcv
Question:
What is the true, fastest, beauty way to create 1000
instances of the class File ?
files = new File[]( 1000 );
files[] = new File(); // add this
Since classes are reference types all instances of files will be
the same reference of "new File()", which you probably don't want.
Re: Web crawler/scraping
On Wednesday, 17 February 2021 at 12:12:56 UTC, Carlos Cabral wrote: Hi, I'm trying to collect some json data from a website/admin panel automatically, which is behind a login form. Is there a D library that can help me with this? Thank you I found this but it looks outdated: https://github.com/gedaiu/selenium.d
Re: Real simple unresolved external symbols question...
On Tuesday, 9 February 2021 at 19:37:17 UTC, WhatMeWorry wrote: I'm trying to create a super simple dynamic library consisting of two files: [...] remove /NOENTRY, and include "mixin SimpleDllMain;" in one of the sources. And link with druntime. link /DLL file2.obj fileB.obj druntime-ldc.lib msvcrt.lib
Need help for opencvd git submoduling
I am wrapping opencv::cuda modules based on c/c++ wrapper files of gocv. This might be more of a git question. Can one link a folder from a repo to be a subfolder of another git repo? Do I have any option other than submoduling the entire Go repo? I want "https://github.com/hybridgroup/gocv/tree/release/cuda; to be "https://github.com/aferust/opencvd/tree/master/c/cuda;
Re: list system drives
On Tuesday, 2 February 2021 at 06:31:27 UTC, Виталий Фадеев wrote: Give, please, Dlang tools for list system drives. Some like a: enumVolumes(); // [ 'C:\', 'D:\' ] I have found this code by a google search. I don't know who the author was. I had to touch it a little since the codebase was old. https://gist.github.com/aferust/5cc3209a6b6caf1062271a082c093b87
Re: How do I get the output of the time bash command?
On Wednesday, 27 January 2021 at 09:35:21 UTC, Anthony wrote:
I'm trying to read the timed output of a pipeShell command but
it only results in empty output.
Does anyone know why this is?
```
auto p = pipeShell("time ls");
foreach(str; p.stdout.byLine) {
writefln("%s",str);
}
```
Probably, just getting a string output is not enough. It looks a
little outdated, but there is this library:
https://code.dlang.org/packages/dexpect
Re: How to covert dchar and wchar to string?
On Monday, 25 January 2021 at 18:45:11 UTC, Rempas wrote: Actually what the title says. For example I have dchar c = '\u03B3'; and I want to make it into string. I don't want to use "to!string(c);". Any help? if you are trying to avoid GC allocations this is not what you want. dchar c = '\u03B3'; string s = ""; s ~= c; writeln(s); writeln(s.length); // please aware of this Some useful things: string is immutable(char)[] wstring is immutable(wchar)[] dstring is immutable(dchar)[] if you have a char[]: you can convert it to a string using assumeUnique: import std.exception: assumeUnique; char[] ca = ... string str = assumeUnique(ca); // similar for dchar->dstring and wchar->wstring
Re: Can we use strings with scanf?
On Monday, 25 January 2021 at 17:38:21 UTC, Rempas wrote:
On Monday, 25 January 2021 at 10:33:14 UTC, Mike Parker wrote:
On Monday, 25 January 2021 at 09:16:11 UTC, Rempas wrote:
[...]
The * has a different meaning for scanf than for printf ([1]
vs [2]).
There's also the issue that a string is immutable(char)[].
If you really, really, really, must use scanf:
```
char[bufSize] buf;
scanf("%s", buf.ptr);
```
But please don't. This is D, not 1990s C.
[1] https://www.cplusplus.com/reference/cstdio/scanf/
[2] https://www.cplusplus.com/reference/cstdio/printf/
Thanks! Actually for some reason. It won't accept a char[size].
I created a heap allocated (with pureFree and pureMalloc)
chrar*, then used fgets() and created an empty string and
looped through the result adding one by one character until the
'\n' which is not included.
char[buffsize] works if buffsize is a compile time constant. Or
just char[1024]. İt is a static array, and it's size must be
defined at compile time.
Re: How define accepted types in a template parameter?
On Saturday, 16 January 2021 at 18:39:03 UTC, Marcone wrote:
For example, I want my function template to only accept integer
or string;
There are different ways of doing that. I'd say this one is easy
to follow:
import std.stdio;
void print(T)(T entry) if(is(T==string) || is(T==int))
{
writeln(entry);
}
void main(){
int i = 5;
string foo = "foo";
double j = 0.6;
print(i);
print(foo);
print(j); // compilation error
}
