Re: D create many thread
On Thursday, 6 February 2020 at 22:00:26 UTC, tchaloupka wrote: On Wednesday, 5 February 2020 at 13:05:59 UTC, Eko Wahyudin wrote: Hi all, I'm create a small (hallo world) application, with DMD. But my program create 7 annoying threads when create an empty class. If you don't want the parallel sweep enabled for your app, you can turn it of ie with: ``` extern(C) __gshared string[] rt_options = [ "gcopt=parallel:0" ]; ``` Or in various other ways as described in mentioned documentation: https://dlang.org/spec/garbage.html#gc_config Why are we doing it like that? That's the least user-friendly method of configuring the GC I have ever seen.
Re: D create many thread
On 07/02/2020 8:53 AM, uranuz wrote: Is it also possible to set some custom thread name for GC threads in order to be distinguishable from other threads in utilities like `htop`? It would be handy... https://dlang.org/phobos/core_thread_osthread.html#.Thread.name.2
Re: How to converte string to wstring[]?
import std.conv: to; string str = "test1"; wstring[] wstr = [to!wstring(str)];
Re: D create many thread
On Wednesday, 5 February 2020 at 13:05:59 UTC, Eko Wahyudin wrote: Hi all, I'm create a small (hallo world) application, with DMD. But my program create 7 annoying threads when create an empty class. If you don't want the parallel sweep enabled for your app, you can turn it of ie with: ``` extern(C) __gshared string[] rt_options = [ "gcopt=parallel:0" ]; ``` Or in various other ways as described in mentioned documentation: https://dlang.org/spec/garbage.html#gc_config
Re: How to converte string to wstring[]?
On Thursday, 6 February 2020 at 21:53:08 UTC, Marcone wrote: How to converte "string" to wstring[] in Dlang? You don't, generally. A string can be converted to a wstring, but a wstring[] is a very different thing. import std.conv; wstring s = to!wstring(some_string); note that works for most types. just string to wstring[] depends on the context.
How to converte string to wstring[]?
How to converte "string" to wstring[] in Dlang?
Re: D create many thread
Is it also possible to set some custom thread name for GC threads in order to be distinguishable from other threads in utilities like `htop`? It would be handy...
Re: Trying to use a template class with ranges
On Thursday, 6 February 2020 at 16:29:57 UTC, Steven
Schveighoffer wrote:
On 2/6/20 11:05 AM, mark wrote:
src/package.d(50,35): Error: no property opCall for type
diffrange.Diff!(dchar[]), did you mean new Diff!(dchar[])?
Hah, forgot that it's a class. Yes, I DID mean new Diff ;)
-Steve
Wow, that's all it needed to compile!
And I've added the extra check you suggested:
auto differ(T)(T a, T b) if (
isForwardRange!T && // T is a range
is(typeof(T.init.front == T.init.front)) // Elements
support ==
) {
return new Diff!T(a, b);
}
Thanks!
Re: Trying to use a template class with ranges
On 2/6/20 11:05 AM, mark wrote: src/package.d(50,35): Error: no property opCall for type diffrange.Diff!(dchar[]), did you mean new Diff!(dchar[])? Hah, forgot that it's a class. Yes, I DID mean new Diff ;) -Steve
Re: Trying to use a template class with ranges
On Thursday, 6 February 2020 at 15:21:46 UTC, Steven
Schveighoffer wrote:
[snip]
3. You should declare constraints signifying what types are
valid. i.e.:
class Diff(T) if (
isForwardRange!T // it's a forward range
&& is(typeof(T.init.front == T.init.front)) // elements are
comparable
)
Might be good to put this constraint on the factory function
too.
I don't know how to do that syntactically. I tried the obvious
and it wouldn't compile.
But even without that it won't compile although it is much closer
now!
import std.range: ElementType, front, isForwardRange;
class Diff(T) if (
isForwardRange!T && // T is a range
is(typeof(T.init.front == T.init.front)) // Elements
support ==
) {
alias E = ElementType!T;
T a;
T b;
size_t[][E] b2j;
this(T a, T b) {
this.a = a;
this.b = b;
chainB();
}
private final void chainB() {
foreach (i, element; b)
b2j[element] ~= i;
// TODO
}
}
auto differ(T)(T a, T b) { return Diff!T(a, b); }
unittest {
import std.array;
import std.stdio: writeln;
writeln("unittest for the diffrange library.");
auto d1 = differ("one two three four".array, "one too tree
four".array);
auto a = ["Tulips are yellow,", "Violets are blue,", "Agar is
sweet,",
"As are you."];
auto b = ["Roses are red,", "Violets are blue,", "Sugar is
sweet,",
"And so are you."];
auto d2 = differ(a, b);
}
Here's the error output:
Excluding package.d file from test due to
https://issues.dlang.org/show_bug.cgi?id=11847
src/package.d(50,35): Error: no property opCall for type
diffrange.Diff!(dchar[]), did you mean new Diff!(dchar[])?
src/package.d(57,21): Error: template instance
diffrange.differ!(dchar[]) error instantiating
src/package.d(50,35): Error: no property opCall for type
diffrange.Diff!(string[]), did you mean new Diff!(string[])?
src/package.d(62,21): Error: template instance
diffrange.differ!(string[]) error instantiating
/home/mark/opt/bin/ldc2 failed with exit code 1.
Curiously the "Excluding package.d file" message isn't true.
Not that I mind, I just want to be able to get it going.
Thanks!
PS The line numbers don't match because I've deleted some structs
& enums that are above the class but which aren't used yet.
Re: Object "A" inherited object "B". And you need to return the object link "B".
On 2/6/20 10:11 AM, Steven Schveighoffer wrote b.step(); // virtual call, calls B.step I meant, calls A.step; -Steve
Re: Trying to use a template class with ranges
On 2/6/20 7:16 AM, mark wrote:
I am starting on porting Python's difflib's sequence matcher to D.
I want to have a class that will accept two ranges whose elements are of
the same type and whose elements can be compared for equality.
How do I make a class declaration that specifies a (forward) range type
and an equality-supporting element type?
Here's what doesn't work:
class Diff(T, E) {
T a; // T should be a forward range of E elements
T b; // E elements must support == and !=
// This is a hash key=E element, value=slice of size_t
size_t[][E] b2j;
this(T a, T b) {
this.a = a;
this.b = b;
chainB();
}
void chainB() {
foreach (i, element; b)
b2j[element] ~= i;
// TODO
}
}
unittest {
import std.stdio: writeln;
writeln("unittest for the diffrange library.");
auto a = ["Tulips are yellow,", "Violets are blue,",
"Agar is sweet,", "As are you."];
auto b = ["Roses are red,", "Violets are blue,",
"Sugar is sweet,", "And so are you."];
auto diff = Diff(a, b);
}
1. If one template parameter depends 100% on the other, it doesn't need
to be a parameter. i.e. I would do:
class Diff(T) {
alias E = ElementType!T;
...
}
2. Class constructors do not support IFTI. You have to explicitly
instantiate. To use IFTI, you need to create a factory function. i.e. to
make the code above work, your ctor call should be Diff!(typeof(a))
(assuming you take the advice in 1).
But you can instead write a function to use IFTI:
auto makeDiff(T)(T r1, T r2) { return Diff!T(r1, r2); }
...
auto diff = makeDiff(a, b);
3. You should declare constraints signifying what types are valid. i.e.:
class Diff(T) if (
isForwardRange!T // it's a forward range
&& is(typeof(T.init.front == T.init.front)) // elements are comparable
)
Might be good to put this constraint on the factory function too.
Note: is(typeof(...)) basically checks if the thing inside the typeof
compiles.
-Steve
Re: Object "A" inherited object "B". And you need to return the object link "B".
On 2/6/20 8:05 AM, Mihail Lorenko wrote: On Thursday, 6 February 2020 at 12:37:01 UTC, Adam D. Ruppe wrote: On Thursday, 6 February 2020 at 12:15:17 UTC, Mihail Lorenko wrote: B* b; A pointer to a class is a rare thing in B since they are already automatic references. Just use `B b;` and ten `b = a` will just work. Thanks for the answer! Well, apparently I have to get around my problem. Thanks again! Not sure, but you might misunderstand. B is already a pointer in D (like Java, D's class instances are always references). And derived classes implicitly cast to base classes. So the a.B syntax is not necessary. To illustrate further: A a = new A; // note, instances by default are null, you need to new them B b = a; // implicit cast assert(a is b); // they are the same object b.step(); // virtual call, calls B.step assert(a.a != 0); // note, protected allows access from same module. -Steve
Re: const pointers C vs. D
On Tuesday, 4 February 2020 at 10:17:39 UTC, Dennis wrote: C++ has a const system that is closer to D's than any other language, but it still has huge differences: Thanks, that clears it up a bit!
Re: Trying to use a template class with ranges
I forgot to mention: I want the class to work with: Diff(aForwardRange, bForwardRange) where T = ForwardRange, E = anything that supports == A common use case is for two sequences of strings (i.e., lines read from two files). Diff(aString, bString) where T = char[] or wchar[] or dchar[] E = char or wchar or dchar
Re: Object "A" inherited object "B". And you need to return the object link "B".
On Thursday, 6 February 2020 at 12:37:01 UTC, Adam D. Ruppe wrote: On Thursday, 6 February 2020 at 12:15:17 UTC, Mihail Lorenko wrote: B* b; A pointer to a class is a rare thing in B since they are already automatic references. Just use `B b;` and ten `b = a` will just work. Thanks for the answer! Well, apparently I have to get around my problem. Thanks again!
Re: Object "A" inherited object "B". And you need to return the object link "B".
On Thursday, 6 February 2020 at 12:15:17 UTC, Mihail Lorenko wrote: B* b; A pointer to a class is a rare thing in B since they are already automatic references. Just use `B b;` and ten `b = a` will just work.
Object "A" inherited object "B". And you need to return the object link "B".
Hello!
Interested in a question.
Object "A" inherited object "B". And you need to return the
object link "B". Is this possible in this language? Here is an
example:
class B
{
protected int a;
public void step() {};
}
class A : B
{
public override step()
{
import std.random;
a = uniform(5,100);
}
}
void main()
{
B* b;
A a;
a.step();
b = a.B; // @FixMe: Here you need a link to object B from
object A.
}
Sorry to trouble you, thanks in advance!
Trying to use a template class with ranges
I am starting on porting Python's difflib's sequence matcher to D.
I want to have a class that will accept two ranges whose elements
are of the same type and whose elements can be compared for
equality.
How do I make a class declaration that specifies a (forward)
range type and an equality-supporting element type?
Here's what doesn't work:
class Diff(T, E) {
T a; // T should be a forward range of E elements
T b; // E elements must support == and !=
// This is a hash key=E element, value=slice of size_t
size_t[][E] b2j;
this(T a, T b) {
this.a = a;
this.b = b;
chainB();
}
void chainB() {
foreach (i, element; b)
b2j[element] ~= i;
// TODO
}
}
unittest {
import std.stdio: writeln;
writeln("unittest for the diffrange library.");
auto a = ["Tulips are yellow,", "Violets are blue,",
"Agar is sweet,", "As are you."];
auto b = ["Roses are red,", "Violets are blue,",
"Sugar is sweet,", "And so are you."];
auto diff = Diff(a, b);
}
Detecting unneeded imports in CI
Hello folks, Are there any well-established CI patterns/tools for detecting unneeded imports in D code? Ideally including detecting unused symbols from selective imports? Thanks and best wishes, -- Joe
Re: Dub - vibe.d - hunt framework ... problems
On Saturday, 1 February 2020 at 10:35:52 UTC, seany wrote: Hi I want to start a small server, that will be accessible form outside. Not a huge deal right? Not quite. My machine: 4.15.0-66-generic #75-Ubuntu SMP Tue Oct 1 05:24:09 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux DMD : DMD64 D Compiler v2.090.0 Copyright (C) 1999-2019 by The D Language Foundation, All Rights Reserved written by Walter Bright How much memory does this machine have? Is it a virtual machine provided by a hosting company? My suspicion is that your server is very slow for some peculiar reason.
Re: Dub - vibe.d - hunt framework ... problems
On Saturday, 1 February 2020 at 10:35:52 UTC, seany wrote:
Hi
I want to start a small server, that will be accessible form
outside. Not a huge deal right?
Not quite.
My machine: 4.15.0-66-generic #75-Ubuntu SMP Tue Oct 1 05:24:09
UTC 2019 x86_64 x86_64 x86_64 GNU/Linux
DMD : DMD64 D Compiler v2.090.0
Copyright (C) 1999-2019 by The D Language Foundation, All
Rights Reserved written by Walter Bright
Now, I try to install dub from the official repo.
Then I do
* dub init server -t vibe.d
* cd server
* dub
I hit this issue : https://github.com/dlang/dub/issues/1712
As suggested, i try to build dub from github, following:
https://github.com/dlang/dub/releases
I call ./build.d - and everything stops, and machine crashes.
I then try to install DaNode:
https://github.com/DannyArends/DaNode
It breaks with : module std.algorithm import 'mean' not found
Then I try to install the Hunt Framework. It breaks with :
basic type
expected, not foreach
Please help. I really want this issue to be resolved-
## 1. For simple server you can using hunt-http library.
Sample code:
```
import hunt.http;
void main()
{
HttpServer server = HttpServer.builder()
.setListener(8080, "0.0.0.0")
.onPost("/", (RoutingContext context) {
context.end("Hello World!");
})
.onGet("/user/:name", (RoutingContext ctx) {
string name = ctx.getRouterParameter("name");
ctx.write("Hello " ~ name);
ctx.end();
})
.build();
server.start();
}
```
## 2. For full server, you can using hunt-skeleton
(hunt-framework based):
```bash
git clone https://github.com/huntlabs/hunt-skeleton.git myproject/
cd myproject/
dub run -v
```
You can Add pages in `config/routes` , like this:
```
GET / index.index
GET /user/{name}user.detail
```
Add Controller file `controller/UserController.d` :
```
module app.controller.UserController;
import hunt.framework;
class UserController : Controller
{
mixin MakeController;
@Action
string detail(string name)
{
return "Hello " ~ name;
}
}
```
Build and run it:
```
cd myproject/
dub run -v
```
You can see it in the borwser:
```
http://localhost:8080
```
