Re: Debugging D code with GDB
I found what Nemiver is much better for debugging D programs. With GDB I've got many problems, don't remember exactly. Thou I've used it through ddd, so maybe it's ddd problems, not exactly GDB's
Re: RFC to: my need for 'static switch' and CT 'static variables'
On Friday, 26 November 2021 at 00:41:34 UTC, Elronnd wrote: you are right. thanks
Re: RFC to: my need for 'static switch' and CT 'static variables'
On Thursday, 25 November 2021 at 22:00:15 UTC, Alexey wrote:
I would want an static 'switch here',
I mean something like
```D
static switch (v.mode)
{
default:
static assert(false, "v.mode" is invalid)
case "gs_w_d":
// etc...
}
```
RFC to: my need for 'static switch' and CT 'static variables'
for example, I have the code (code in sample generates different
types of Properties dependingly on struct's mode value):
```D
struct PropSetting
{
string mode;
string type;
string var_name;
string title_name;
string default_value;
}
mixin template mixin_install_multiple_properties(PropSetting[]
settings)
{
import std.format;
static foreach (v; settings)
{
static if (v.mode == "gs_w_d")
{
mixin(
q{
private {
mixin Property_%1$s!(%2$s, "%3$s", %5$s);
}
mixin Property_forwarding!(%2$s, %3$s,
"%4$s");
}.format(
v.mode,
v.type,
v.var_name,
v.title_name,
v.default_value,
)
);
}
static if (v.mode == "gsu" || v.mode == "gs" || v.mode ==
"gsun")
{
mixin(
q{
private {
mixin Property_%1$s!(%2$s, "%3$s");
}
mixin Property_forwarding!(%2$s, %3$s,
"%4$s");
}.format(
v.mode,
v.type,
v.var_name,
v.title_name,
)
);
}
}
}
```
currently it works kind of ok. but what it's missing is check on
what none of [static if]s have worked. Ideally, I would want an
static 'switch here', so I could make `static assert(false)` in
it. and/or I'd like some sort of [compile time variable] to
change it if [static if]s have worked and check such [compile
time variable] later.
Re: How to read a single character in D language?
On Wednesday, 24 November 2021 at 04:51:03 UTC, Alexey wrote:
On Wednesday, 24 November 2021 at 04:48:46 UTC, Alexey wrote:
oh, also I completely missed what you need it to work without
Enter key presses. so here is fixed version
```D
import std.stdio;
import core.sys.posix.termios;
void main()
{
termios input_settings;
tcgetattr(stdin.fileno, _settings);
input_settings.c_lflag &= ~ICANON;
tcsetattr(stdin.fileno, TCSANOW, _settings);
while (true)
{
char c;
stdin.readf("%c", );
writefln("\n%c (0x%1$x %1$d) is inputed", c);
}
}
```
Re: How to read a single character in D language?
On Wednesday, 24 November 2021 at 04:48:46 UTC, Alexey wrote: writefln(0x"%c (%1$x %1$d) is inputed", c); sorry: ```diff 10c10
Re: How to read a single character in D language?
On Friday, 19 November 2021 at 17:36:55 UTC, BoQsc wrote:
Let's say I want to write a simple program that asks for an
input of a single character.
After pressing a single key on a keyboard, the character is
printed out and the program should stop.
```D
import std.stdio;
void main()
{
while (true)
{
char c;
scanf("%c", );
writefln(0x"%c (%1$x %1$d) is inputed", c);
}
}
```
Re: mixins
On Wednesday, 17 November 2021 at 14:51:58 UTC, Abby wrote:
Hello I would like to create validation mixin or mixin template
which would return on error.
Something like this:
```
mixin template Validate(a, b)
{
if(a > b)
{
writeln("invalid input");
return false;
}
}
bool test(a,b)
{
mixin Validate!(a,b);
on valid code
return true;
}
```
I'll add My 5 cents: with aliases this a little bit flexibilier,
but without temporary function declaration this doesn't work
```D
import std.stdio;
mixin template validation(alias a, alias b)
{
mixin(
q{
bool x(){
writeln("a: ",a, " b: ", b);
if (a > b)
{
writeln("invalid input");
return false;
}
return true;
}
}
);
}
bool test(int a, int b)
{
mixin validation!(a, b);
if (!x()) return false;
return true;
}
void main()
{
writeln("test result: ", test(2,1));
}
```
Re: need `this` on trying to use class method with parallelism Task! or task!
On Sunday, 14 November 2021 at 17:42:18 UTC, Imperatorn wrote: Try task() instead of task!() worked! huge thanks!
Re: need `this` on trying to use class method with parallelism Task! or task!
On Sunday, 14 November 2021 at 16:40:58 UTC, Andrey Zherikov
wrote:
Just do `auto t1 = task()` in `threadCreator` then.
Error: value of `this` is not known at compile time
```D
import std.stdio;
import std.parallelism;
class TC
{
void threadFunc()
{
import core.thread;
import core.time;
scope (exit)
writeln("threadFunc done");
core.thread.osthread.Thread.getThis.sleep(msecs(2000));
}
void threadCreator()
{
scope (exit)
writeln("threadCreator done");
auto t1 = task!();
t1.executeInNewThread();
}
}
void main()
{
scope (exit)
writeln("main done");
auto tc = new TC;
tc.threadCreator();
}
```
Re: need `this` on trying to use class method with parallelism Task! or task!
On Sunday, 14 November 2021 at 14:24:00 UTC, Andrey Zherikov wrote: On Sunday, 14 November 2021 at 12:01:36 UTC, Alexey wrote: You just need two changes: - make `threadFunc` function static: `static void threadFunc()` - use `task` instead of `Task`: `auto t1 = task!threadFunc;` I need `this` to be available inside of threadFunc
Re: need `this` on trying to use class method with parallelism Task! or task!
On Sunday, 14 November 2021 at 12:01:36 UTC, Alexey wrote:
/home/animuspexus/dlang/d_v2.098.0/dmd/generated/linux/release/64/../../../../../phobos/std/parallelism.d(436):
Error: need `this` for `threadFunc` of type `void()`
Go example for contrast. Ideally, I'd like something similar;
```Go
package main
import (
"fmt"
"time"
)
type TC struct {
}
func (self *TC) threadFunc() {
defer fmt.Println("threadFunc done")
time.Sleep(time.Duration(time.Second * 2))
}
func (self *TC) threadCreator() {
defer fmt.Println("threadCreator done")
go self.threadFunc()
}
func main() {
defer fmt.Println("main done")
tc := new(TC)
tc.threadCreator()
}
```
Re: need `this` on trying to use class method with parallelism Task! or task!
On Sunday, 14 November 2021 at 12:01:36 UTC, Alexey wrote: auto t1 = Task!threadFunc; if this line rewritten as `auto t1 = Task!(TC.threadFunc, this);` ```text /home/animuspexus/dlang/d_v2.098.0/dmd/generated/linux/release/64/../../../../../phobos/std/parallelism.d(451): Error: tuple `Args` is used as a type /home/animuspexus/dlang/d_v2.098.0/dmd/generated/linux/release/64/../../../../../phobos/std/parallelism.d(533): Error: tuple `Args` is used as a type /home/animuspexus/dlang/d_v2.098.0/dmd/generated/linux/release/64/../../../../../druntime/import/core/internal/traits.d(191): Error: template instance `pred!(this)` does not match template declaration `isAssignable(Lhs, Rhs = Lhs)` /home/animuspexus/dlang/d_v2.098.0/dmd/generated/linux/release/64/../../../../../phobos/std/meta.d(842): Error: template instance `t.TC.threadCreator.allSat!(isAssignable, this)` error instantiating /home/animuspexus/dlang/d_v2.098.0/dmd/generated/linux/release/64/../../../../../phobos/std/parallelism.d(541): instantiated from here: `allSatisfy!(isAssignable, this)` ./t.d(22):instantiated from here: `Task!(threadFunc, this)` ```
need `this` on trying to use class method with parallelism Task! or task!
/home/animuspexus/dlang/d_v2.098.0/dmd/generated/linux/release/64/../../../../../phobos/std/parallelism.d(436):
Error: need `this` for `threadFunc` of type `void()`
./t.d(22): Error: template instance
`std.parallelism.Task!(threadFunc)` error instantiating
thou documentation says `a function (or delegate or other
callable)`
```D
import std.stdio;
import std.parallelism;
class TC {
void threadFunc()
{
import core.thread;
import core.time;
scope(exit) writeln("threadFunc done");
core.thread.osthread.Thread.getThis.sleep(msecs(2000));
}
void threadCreator()
{
scope(exit) writeln("threadCreator done");
auto t1 = Task!threadFunc;
t1.executeInNewThread();
}
}
void main()
{
scope(exit) writeln("main done");
auto tc = new TC;
tc.threadCreator();
}
```
Re: Inheriting function template from super class
On Monday, 27 September 2021 at 16:10:54 UTC, Adam D Ruppe wrote:
This is by design, overloads only consider things declared in
the same place.
see here https://dlang.org/articles/hijack.html
thanks, Adam
I'd also like to ask about similar code.
If I'm writing code like so, I'm getting error.
What I wanted to, is `this` to be the instance of C2. how can I
do this?
the second snippet is how I worked it around (explicitly defined
and used template type parameter), but is there better solution?
```D
import std.stdio;
class C1
{
void writetext()
{
this.writetext_x();
}
void writetext_x(this T)()
{
const id = __traits(identifier, T);
pragma(msg, "generating writetext for ", id);
static assert(is(T == typeof(this)));
}
}
class C2 : C1
{
}
void main()
{
auto c2 = new C2;
c2.writetext_x();
}
```
```D
import std.stdio;
class C1
{
void writetext()
{
this.writetext_x();
}
void writetext_x(T)(T new_this)
{
const id = __traits(identifier, T);
pragma(msg, "generating writetext for ", id);
}
}
class C2 : C1
{
}
void main()
{
auto c2 = new C2;
c2.writetext_x();
}
```
Re: Inheriting function template from super class
On Monday, 27 September 2021 at 14:54:41 UTC, Alexey wrote:
hello.
here I have some code sample.
consequently, If I want C3 to inherit form C2, I'll have to
forward template to from C1 to C2 by hand:
```D
import std.stdio;
class C1
{
void writetext()
{
this.writetext!(typeof(this))();
}
void writetext(alias A1)()
{
writeln("C1 writetext(alias A1) ", this);
}
}
class C2 : C1
{
override void writetext()
{
this.writetext!(typeof(this))();
}
void writetext(alias A1)()
{
super.writetext!(A1)();
}
}
class C3 : C2
{
override void writetext()
{
super.writetext!(typeof(this))();
}
}
void main()
{
auto c3 = new C3;
c3.writetext();
}
```
Inheriting function template from super class
hello.
here I have some code sample.
I'm not sure if this is my incorrect code or incorrect dmd
behavior.
Intention is C2 to inherit C1's `void writetext(alias A1)()` and
instantiate it with `this.writetext!(typeof(this))();`
```D
import std.stdio;
class C1
{
void writetext()
{
this.writetext!(typeof(this))();
}
void writetext(alias A1)()
{
writeln("C1 writetext(alias A1) ", this);
}
}
class C2 : C1
{
override void writetext()
{
// if line 21 is commented and line 22 is uncommented -
this compiles ok
this.writetext!(typeof(this))();
// super.writetext!(typeof(this))();
}
}
void main()
{
auto c2 = new C2;
c2.writetext();
}
```
Re: implimenting interface function by inheriting from other class
On Sunday, 22 August 2021 at 12:20:56 UTC, Alexey wrote:
On Saturday, 21 August 2021 at 20:35:43 UTC, Alexey wrote:
Hello
```D
interface Int
{
void coolFunc();
}
class C1
{
void coolFunc()
{
return;
}
}
class C2 : C1, Int
{
}
void main()
{
auto c = new C2;
}
```
dmd says it's not Ok:
t.d(14): Error: class `t.C2` interface function `void
coolFunc()` is not implemented
how to make dmd happy?
so, Is this a bug in dmd or not?
some answers have been given here and here
https://discord.com/channels/242094594181955585/242122752436338688/878996818904612864
https://issues.dlang.org/show_bug.cgi?id=22232
Re: implimenting interface function by inheriting from other class
On Saturday, 21 August 2021 at 20:35:43 UTC, Alexey wrote:
Hello
```D
interface Int
{
void coolFunc();
}
class C1
{
void coolFunc()
{
return;
}
}
class C2 : C1, Int
{
}
void main()
{
auto c = new C2;
}
```
dmd says it's not Ok:
t.d(14): Error: class `t.C2` interface function `void
coolFunc()` is not implemented
how to make dmd happy?
so, Is this a bug in dmd or not?
Re: implimenting interface function by inheriting from other class
On Saturday, 21 August 2021 at 20:35:43 UTC, Alexey wrote:
Hello
```D
interface Int
{
void coolFunc();
}
class C1
{
void coolFunc()
{
return;
}
}
class C2 : C1, Int
{
}
void main()
{
auto c = new C2;
}
```
dmd says it's not Ok:
t.d(14): Error: class `t.C2` interface function `void
coolFunc()` is not implemented
how to make dmd happy?
we're with friends tried similar thing with c++, java, groovy and
go - worked ok.
```Java
interface Int
{
public void coolFunc();
};
class C1
{
public void coolFunc()
{
return;
}
};
class C2 extends C1 implements Int
{
};
public class Main {
public static void main(String args[])
{
Int c = new C2();
}
}
```
```Groovy
interface Int
{
void coolFunc()
}
class C1
{
void coolFunc()
{ print "hello" }
}
class C2 extends C1 implements Int
{ }
def printHello = { Int a -> a.coolFunc(); print " world: accept
$Int" }
C2 a = new C2()
printHello(a)
```
```C++
class Int;
class C1;
class C2;
class Int
{
public:
virtual void coolFunc() = delete;
};
class C1
{
public:
virtual void coolFunc()
{
return;
}
};
class C2 : public C1, public Int
{
public:
};
int main(int argc, char* argv[])
{
auto c = new C2;
}
```
```Go
package main
import "fmt"
type Int interface {
CoolFunc()
}
type C1 struct {
}
func (self *C1) CoolFunc() {
fmt.Println("worked")
return
}
type C2 struct {
C1
}
func main() {
var c Int
c = new(C2)
c.CoolFunc()
}
```
Re: implimenting interface function by inheriting from other class
On Saturday, 21 August 2021 at 23:14:14 UTC, Alexey wrote:
I want `this` inside of C1::coolFunc to return C2 if called as
C2::coolFunc
so executing `cast(C2) this !is null` inside of C1::coolFunc
would work
If this would work, I'd farther used this like so
```D
interface Int
{
void coolFunc();
}
class C1
{
void coolFunc()
{
{
auto obj = (cast(C1)(cast(Int) this));
if (obj !is null)
{
do_one_thing();
}
}
{
auto obj = (cast(C2)(cast(Int) this));
if (obj !is null)
{
do_another_thing();
}
}
{
auto obj = (cast(C3)(cast(Int) this));
if (obj !is null)
{
do_something_else();
}
}
return;
}
}
class C2 : C1, Int
{
}
class C3 : C1, Int
{
}
class C4 : C1, Int
{
}
void main()
{
auto c = new C2;
c.coolFunc();
}
```
Re: implimenting interface function by inheriting from other class
I want `this` inside of C1::coolFunc to return C2 if called as C2::coolFunc so executing `cast(C2) this !is null` inside of C1::coolFunc would work
Re: implimenting interface function by inheriting from other class
On Saturday, 21 August 2021 at 22:56:40 UTC, Bastiaan Veelo wrote:
On Saturday, 21 August 2021 at 20:35:43 UTC, Alexey wrote:
Hello
```D
interface Int
{
void coolFunc();
}
class C1
{
void coolFunc()
{
return;
}
}
class C2 : C1, Int
{
}
void main()
{
auto c = new C2;
}
```
dmd says it's not Ok:
t.d(14): Error: class `t.C2` interface function `void
coolFunc()` is not implemented
how to make dmd happy?
Not sure if this is the best way, but it does make dmd happy:
https://run.dlang.io/is/44F3AE
```d
class C2 : C1, Int
{
override void coolFunc()
{
C1.coolFunc;
}
}
```
It looks lame, I admit.
— Bastiaan.
I want `this` inside of C1::coolFunc to return C2 if called as
C2::coolFunc
implimenting interface function by inheriting from other class
Hello
```D
interface Int
{
void coolFunc();
}
class C1
{
void coolFunc()
{
return;
}
}
class C2 : C1, Int
{
}
void main()
{
auto c = new C2;
}
```
dmd says it's not Ok:
t.d(14): Error: class `t.C2` interface function `void coolFunc()`
is not implemented
how to make dmd happy?
Re: How to check if variable of some type can be of null value?
On Saturday, 24 July 2021 at 18:10:07 UTC, Alexey wrote: I've tried to use ```typeof(t) is cast(t)null```, but compiler exits with error and so this can't be used for checking this issue. The goal I with to achieve by this check - is to use template and to assign value to variable basing on it's ability to accept null as a value. currently I ended up using ```__traits(compiles, cast(T1)null)``` for this check. but don't know is this really semantically correct.
How to check if variable of some type can be of null value?
I've tried to use ```typeof(t) is cast(t)null```, but compiler
exits with error and so this can't be used for checking this
issue.
The goal I with to achieve by this check - is to use template and
to assign value to variable basing on it's ability to accept null
as a value.
some testing code below.
```D
import std.stdio;
interface I1
{
}
class C1 : I1
{
}
struct S1
{
}
struct S2
{
int a=1;
}
void main()
{
auto c1 = new C1;
I1 i1 = c1;
auto s1 = S1();
auto s2 = S2();
static assert(typeof(c1).init is cast(typeof(c1)) null);
static assert(typeof(i1).init is cast(typeof(i1)) null);
static assert(typeof(s1).init is cast(typeof(s1)) null);
static assert(typeof(s2).init is cast(typeof(s2)) null);
static assert(int.init is cast(int) null);
}
```
Visual Studio 2019
Does Visual Studio 2019 support D development? If yes, please give me instructions on how to work in this environment.
