Re: Need help with DLANGUI
On 25/03/2015 2:31 a.m., Eric wrote: BTW, why do you need FreeImage to create image? Isn't it just possible inside dlangui? This is basically my question. Is there a drawing engine that can draw lines, circles, and shapes as well as single pixels? -Eric If you have some way to draw you might be interested in my LineGraph[0]. It only handles getting coordinates to draw by. But I don't see why shapes couldn't be added. [0] https://github.com/Devisualization/util/blob/master/source/core/devisualization/util/core/linegraph.d
Re: Need help with DLANGUI
BTW, why do you need FreeImage to create image? Isn't it just possible inside dlangui? This is basically my question. Is there a drawing engine that can draw lines, circles, and shapes as well as single pixels? -Eric
Re: How to connect asynchronously (non block) with kqueue?
On 3/24/2015 5:50 AM, zhmt wrote: I am using kqueue on macosx, I know how to write a simple server. But don't know which event will be triggered in kqueue when connected successfully , which event when failed? EVFILT_READ or EVFILT_WRITE? I have googled this question, got no examples, any suggestions are welcome, Thanks. Look into libasync for an abstraction to kqueue https://github.com/etcimon/libasync Also, this is what you're looking for: https://github.com/etcimon/libasync/blob/628850e8a6020298612e8a35229f5539d7385bae/source/libasync/posix.d#L1826
Re: How to connect asynchronously (non block) with kqueue?
On Tuesday, 24 March 2015 at 12:25:14 UTC, Etienne wrote: On 3/24/2015 5:50 AM, zhmt wrote: I am using kqueue on macosx, I know how to write a simple server. But don't know which event will be triggered in kqueue when connected successfully , which event when failed? EVFILT_READ or EVFILT_WRITE? I have googled this question, got no examples, any suggestions are welcome, Thanks. Look into libasync for an abstraction to kqueue https://github.com/etcimon/libasync Also, this is what you're looking for: https://github.com/etcimon/libasync/blob/628850e8a6020298612e8a35229f5539d7385bae/source/libasync/posix.d#L1826 This is exacatly what I am looking for, very good! Thanks!
How to connect asynchronously (non block) with kqueue?
I am using kqueue on macosx, I know how to write a simple server. But don't know which event will be triggered in kqueue when connected successfully , which event when failed? EVFILT_READ or EVFILT_WRITE? I have googled this question, got no examples, any suggestions are welcome, Thanks.
Re: D's type classes pattern ?
On Tuesday, 24 March 2015 at 16:56:13 UTC, matovitch wrote:
Thanks, just to be clear :
void Bar(T : Foo)(T t){
}
is the same as
void Bar(T)(T t) if (is(T == Foo)){
}
and it is checked only at compile time ? (for the runtime I
know that what interface were meant for ;)).
Ali already mentioned the difference between == and :.
In addition to that, template specializations (like `Bar(T :
Foo)(T t)`) and template constraints (like `Bar(T)(T t) if(is(T :
Foo))`) are similar but generally not interchangeable.
A template with a specialization is considered a better match
than one without. Whereas a template constraint doesn't add to
the quality of the match.
An example:
module test;
import std.stdio;
void f(T)(T t) {writeln(generic);}
void f(T : int)(T t) {writeln(with specialization);}
void f(T)(T t) if(is(T : Object)) {writeln(with constraint);}
void main()
{
f(some string); /* - generic */
f(42); /* - with specialization */
version(none) f(new Object); /* Doesn't compile, because it
matches both the generic version and the one with the constraint.
*/
}
Re: D's type classes pattern ?
On 03/24/2015 08:50 AM, matovitch wrote:
Lets say I want to implement some generic algorithm. I would like
to checks the types passed to my algorithm implements a specific
interface.
I think you are looking for template constraints. Look at isInputRange's
implementation:
https://github.com/D-Programming-Language/phobos/blob/master/std/range/primitives.d#L143
Then you can do:
void foo(Range)(Range range)
if (isInputRange!Range)// --
{
// ...
}
I have some explanation and examples here:
http://ddili.org/ders/d.en/templates_more.html#ix_templates_more.named%20template%20constraint
Ali
Re: D's type classes pattern ?
On 03/24/2015 09:56 AM, matovitch wrote:
just to be clear :
void Bar(T : Foo)(T t){
}
That means if T can implicitly be converted to Foo.
is the same as
void Bar(T)(T t) if (is(T == Foo)){
}
That means if T is exactly Foo.
and it is checked only at compile time ?
Yes to both.
Ali
BigInt and xor
Tell me, please, how can I replace this code?
import std.conv : to;
import std.bigint : BigInt;
import std.string : format;
import std.stdio : writeln;
void main() {
BigInt[10] bitArr;
ulong n = 18_446_724_073_709_551_614U;
bitArr[0] = format(%b, n).to!BigInt;
writeln(bitArr[0]);
writeln(bitArr[0] ^ 1); // not work
}
Output:
11101101110001100011000110101010
11101101110001100011000110101011
D's type classes pattern ?
Hi,
It's been a long time since I coded some d code... sorry I take
the lazy way asking for advices. :D
Lets say I want to implement some generic algorithm. I would like
to checks the types passed to my algorithm implements a specific
interface.
interface IStuff(Stuff)
{
void foo();
}
class TypeClass(T, I) : I(T)
{
alias this T;
}
void myAwesomeAlgo(Stuff) (TypeClass!(Stuff, IStuff) stuff)
{
stuff.foo();
}
Well it seems that I have worked out my question in trying to
formulate it...Would something like this work ?
how call a c function with stdcall?
for example:use vc compile on x86
func.c:
__declspec(dllexport) int _stdcall sub(int a,int b)
{
return a-b;
}
func.def:
LIBRARY
EXPORTS
sub
-
i use implib.exe to create a omf format lib.
D code:
import std.exception;
//this is a cdecl call
extern(C) int sub(int a,int b);
void main()
{
auto c1 = sub(2,1);
//when this line run,the c1 value is broken
auto c2 = enforceEx!Exception(sub(1,2));
}
--
my question is how write D code to call the c function
Re: D's type classes pattern ?
More like :
import std.stdio;
interface IStuff(Stuff)
{
void foo();
}
class TypeClass(T, I) : I(T)
{
alias this stuff;
T stuff;
}
void myAwesomeAlgo(Stuff) (TypeClass!(Stuff, IStuff) stuff)
{
stuff.foo();
}
struct MyStuff
{
void foo()
{
writeln(Hello World !);
}
}
void main()
{
alias TypeStuff = TypeClass!(MyStuff, IStuff);
TypeStuff stuff;
myAwesomeAlgo(stuff);
}
Doesn't compile btw :
kmeans.d(8): Error: members expected
kmeans.d(8): Error: { } expected following aggregate declaration
kmeans.d(8): Error: Declaration expected, not '('
kmeans.d(12): Error: unrecognized declaration
Re: D's type classes pattern ?
Well, just follow that link to the code...it almost compile : http://dpaste.com/3JNP0QD.
Re: how call a c function with stdcall?
On Tuesday, 24 March 2015 at 15:26:22 UTC, Adam D. Ruppe wrote: try extern(Windows) isntead of extern(C). use extern(Windows) or extern(System) the compile show the link error: Error 42: Symbol Undefined _sub@8 dll export func name is sub, and the dll is 3rd party,i can't change the dll code. i use implib.exe /system func.lib func.dll to create a func.lib. how can i link correctly?
Re: how call a c function with stdcall?
On Wednesday, 25 March 2015 at 00:09:33 UTC, mzf wrote: i use implib.exe /system func.lib func.dll to create a func.lib. You might also need to specify the .def file as the final argument to that. http://digitalmars.com/ctg/implib.html The def file can list aliases for the functions. Maybe try it without the /system flag too. I know there's a way but I don't know exactly what, I just tend to guess and check a little...
Re: Is there websocket client implementation for D
On 25/03/2015 6:55 a.m., Ilya Korobitsyn wrote: Hello! Is there any websocket client implementation in D? I know there is WS server as a part of vibe.d, but it does not seem to include client. Maybe there are some library bindings that I've missed? Thank you, Ilya It appears you are on your own.
Re: how call a c function with stdcall?
On Wednesday, 25 March 2015 at 00:26:21 UTC, Adam D. Ruppe wrote: On Wednesday, 25 March 2015 at 00:09:33 UTC, mzf wrote: i use implib.exe /system func.lib func.dll to create a func.lib. You might also need to specify the .def file as the final argument to that. http://digitalmars.com/ctg/implib.html The def file can list aliases for the functions. Maybe try it without the /system flag too. I know there's a way but I don't know exactly what, I just tend to guess and check a little... 1.def file: LIBRARY func EXPORTS _sub@8 = sub 2.create lib implib.exe func.lib func.def - now it works fine,thanks!
Re: D's type classes pattern ?
Wait no ! In that case my type will have to inherit the interface...I don't want that, checking without inheriting...I know thats weird.
Re: [Dscanner] Textadept integration
On Tuesday, 24 March 2015 at 16:54:47 UTC, Chris wrote: I tried to use Dscanner with Textadpet, but it doesn't work. I created the directory modules/dmd and copied the init.lua file from here [1] into it. What am I doing wrong, or is it an old version that is no longer supported? [1] https://bitbucket.org/SirAlaran/ta-d/ The message: ...ment/Textadept/textadept_7.9.x86_64/modules/dmd/init.lua:28: module 'common.cstyle' not found [snip]
Re: D's type classes pattern ?
On Tuesday, 24 March 2015 at 16:44:54 UTC, weaselcat wrote:
On Tuesday, 24 March 2015 at 15:51:00 UTC, matovitch wrote:
Hi,
It's been a long time since I coded some d code... sorry I take
the lazy way asking for advices. :D
Lets say I want to implement some generic algorithm. I would
like
to checks the types passed to my algorithm implements a
specific
interface.
interface IStuff(Stuff)
{
void foo();
}
class TypeClass(T, I) : I(T)
{
alias this T;
}
void myAwesomeAlgo(Stuff) (TypeClass!(Stuff, IStuff) stuff)
{
stuff.foo();
}
Well it seems that I have worked out my question in trying to
formulate it...Would something like this work ?
interface Foo{
}
void Bar(T : Foo)(T t){
}
but interfaces enable runtime polymorphism, you can just accept
the interface itself
void Fun(Foo foo){
}
Thanks, just to be clear :
void Bar(T : Foo)(T t){
}
is the same as
void Bar(T)(T t) if (is(T == Foo)){
}
and it is checked only at compile time ? (for the runtime I know
that what interface were meant for ;)).
Is there websocket client implementation for D
Hello! Is there any websocket client implementation in D? I know there is WS server as a part of vibe.d, but it does not seem to include client. Maybe there are some library bindings that I've missed? Thank you, Ilya
Re: BigInt and xor
On Tuesday, 24 March 2015 at 17:35:14 UTC, matovitch wrote: xor it with -1 instead of 1. (-1 is store as 0xfff..f with the classic modular arithmetic) Thanks.
Re: BigInt and xor
On Tuesday, 24 March 2015 at 15:45:36 UTC, Dennis Ritchie wrote:
Tell me, please, how can I replace this code?
import std.conv : to;
import std.bigint : BigInt;
import std.string : format;
import std.stdio : writeln;
void main() {
BigInt[10] bitArr;
ulong n = 18_446_724_073_709_551_614U;
bitArr[0] = format(%b, n).to!BigInt;
writeln(bitArr[0]);
writeln(bitArr[0] ^ 1); // not work
}
Output:
11101101110001100011000110101010
11101101110001100011000110101011
Hi,
Well it works, the las bit is flip isn't it ? What are you trying
to achieve ?
Re: BigInt and xor
On Tuesday, 24 March 2015 at 16:35:04 UTC, Ivan Kazmenko wrote:
What exactly is not working?
Everything works. I'm just a little forgotten properties of the
operation xor.
I just wanted to xor 1 each digit in the number of type BigInt,
while I would like to store each number in the binary
representation of the array BigInt.
The only thing I see lacking is an ability to print a BigInt in
binary via writefln(%b).
Yes. It would be nice.
Up to 64 bits, arithmetic and bitwise operations, including
xor, are available with long and ulong. Just print the result
as binary:
-
import std.stdio;
void main() {
ulong n = ulong.max - 0b1000101;
writeln (n);
writefln (%b, n);
writefln (%b, n ^ 1);
}
-
Output:
-
18446744073709551546
10111010
10111011
-
If you need more than 64 bits, take a look at BitArray here, it
also has xor defined:
http://dlang.org/phobos/std_bitmanip.html#.BitArray
Thanks.
In the future, please explain what problem you are trying to
solve, as the wrong code alone often leaves one guessing.
OK, I will try.
Re: BigInt and xor
On Tuesday, 24 March 2015 at 15:45:36 UTC, Dennis Ritchie wrote:
Tell me, please, how can I replace this code?
import std.conv : to;
import std.bigint : BigInt;
import std.string : format;
import std.stdio : writeln;
void main() {
BigInt[10] bitArr;
ulong n = 18_446_724_073_709_551_614U;
bitArr[0] = format(%b, n).to!BigInt;
writeln(bitArr[0]);
writeln(bitArr[0] ^ 1); // not work
}
Output:
11101101110001100011000110101010
11101101110001100011000110101011
What exactly is not working?
The only thing I see lacking is an ability to print a BigInt in
binary via writefln(%b).
Up to 64 bits, arithmetic and bitwise operations, including xor,
are available with long and ulong. Just print the result as
binary:
-
import std.stdio;
void main() {
ulong n = ulong.max - 0b1000101;
writeln (n);
writefln (%b, n);
writefln (%b, n ^ 1);
}
-
Output:
-
18446744073709551546
10111010
10111011
-
If you need more than 64 bits, take a look at BitArray here, it
also has xor defined:
http://dlang.org/phobos/std_bitmanip.html#.BitArray
In the future, please explain what problem you are trying to
solve, as the wrong code alone often leaves one guessing.
Ivan Kazmenko.
Re: D's type classes pattern ?
To resume my goal (last lonely message I promise), how can you statically check a type implement an interface without making this type inherit the interface (otherwise std.traits would do it) ? ps : it seems to me that this is exactly what the haskell compiler do with type classes - layman opinion
Re: BigInt and xor
On Tuesday, 24 March 2015 at 15:45:36 UTC, Dennis Ritchie wrote:
Tell me, please, how can I replace this code?
import std.conv : to;
import std.bigint : BigInt;
import std.string : format;
import std.stdio : writeln;
void main() {
BigInt[10] bitArr;
ulong n = 18_446_724_073_709_551_614U;
bitArr[0] = format(%b, n).to!BigInt;
writeln(bitArr[0]);
writeln(bitArr[0] ^ 1); // not work
}
Output:
11101101110001100011000110101010
11101101110001100011000110101011
Looks right to me. What output would you expect?
Also, if you need a bit array you can simply use std.container's
Array!bool. It's specialized for bool and uses only one bit per
element.
Re: D's type classes pattern ?
well, alias this is the issue here.
interface I
{
void foo();
}
struct S
{
void foo() {}
}
class C : I
{
S s;
alias this s;
}
don't compile...if you have any idea to do otherwise I am greatly
interested. Thanks !
Re: std.typecons.Flag -- public import for API users?
On Saturday, 21 March 2015 at 23:16:39 UTC, rcorre wrote: If I am developing a library and some of my functinos take a std.typecons.Flag as an argument, should I 'public import std.typecons: Flag, Yes, No'? It seems like it would be a pain for users of the library to have to import this separately whenever they use my library, but I'm not sure what the stance is on having your modules `public import` standard-library modules. In general, is it considered bad form to 'public import' modules from phobos? Should not be necessary. privately import Flag and make a public alias: module a; import std.typecons : Flag; alias SomeFlag = Flag!SomeFlag; SomeFlag.Yes and SomeFlag.No should be usable in other modules without additional imports.
Re: D's type classes pattern ?
On Tuesday, 24 March 2015 at 15:51:00 UTC, matovitch wrote:
Hi,
It's been a long time since I coded some d code... sorry I take
the lazy way asking for advices. :D
Lets say I want to implement some generic algorithm. I would
like
to checks the types passed to my algorithm implements a specific
interface.
interface IStuff(Stuff)
{
void foo();
}
class TypeClass(T, I) : I(T)
{
alias this T;
}
void myAwesomeAlgo(Stuff) (TypeClass!(Stuff, IStuff) stuff)
{
stuff.foo();
}
Well it seems that I have worked out my question in trying to
formulate it...Would something like this work ?
interface Foo{
}
void Bar(T : Foo)(T t){
}
but interfaces enable runtime polymorphism, you can just accept
the interface itself
void Fun(Foo foo){
}
Problem overloading operator for a struct with an immutable member
I don't know if this is a bug or expected behaviour. The struct
is mutable, assignable and pre-increment operator works. But
post-increment doesn't compile because of the immutable member.
--
struct S
{
int i;
immutable(Object) o;
S opUnary(string op)() { return this; }
void opAssign(S other) {}
}
void main()
{
S s, t;
t = s; // OK
++s; // OK
s++; // Error: cannot modify struct s S with immutable members
}
---
[Dscanner] Textadept integration
I tried to use Dscanner with Textadpet, but it doesn't work. I created the directory modules/dmd and copied the init.lua file from here [1] into it. What am I doing wrong, or is it an old version that is no longer supported? [1] https://bitbucket.org/SirAlaran/ta-d/
Re: Need help with DLANGUI
On Tuesday, 24 March 2015 at 13:31:06 UTC, Eric wrote:
BTW, why do you need FreeImage to create image? Isn't it just
possible inside dlangui?
This is basically my question. Is there a drawing engine that
can draw lines, circles, and shapes as well as single pixels?
-Eric
Hello,
I've implemented CanvasWidget today as convenient way of custom
drawing, and added drawPixel and drawLine methods to DrawBuf.
See example1 / Canvas tab.
Sample code:
CanvasWidget canvas = new CanvasWidget(canvas);
canvas.layoutWidth(FILL_PARENT).layoutHeight(FILL_PARENT);
canvas.onDrawListener = delegate(CanvasWidget canvas, DrawBuf
buf, Rect rc) {
buf.fill(0xFF);
int x = rc.left;
int y = rc.top;
buf.fillRect(Rect(x+20, y+20, x+150, y+200), 0x80FF80);
buf.fillRect(Rect(x+90, y+80, x+250, y+250), 0x80FF80FF);
canvas.font.drawText(buf, x + 40, y + 50, fillRect()d,
0xC080C0);
buf.drawFrame(Rect(x + 400, y + 30, x + 550, y + 150),
0x204060, Rect(2,3,4,5), 0x80704020);
canvas.font.drawText(buf, x + 400, y + 5, drawFrame()d,
0x208020);
canvas.font.drawText(buf, x + 300, y + 100, drawPixel()d,
0x80);
for (int i = 0; i 80; i++)
buf.drawPixel(x+300 + i * 4, y+140 + i * 3 % 100, 0xFF + i
* 2);
canvas.font.drawText(buf, x + 200, y + 250, drawLine()d,
0x800020);
for (int i = 0; i 40; i+=3)
buf.drawLine(Point(x+200 + i * 4, y+290), Point(x+150 + i * 7,
y+420 + i * 2), 0x008000 + i * 5);
};
Re: using vibe.d to parse json
On 24/03/2015 6:36 p.m., Laeeth Isharc wrote:
On Tuesday, 24 March 2015 at 04:53:39 UTC, Laeeth Isharc wrote:
Hi.
struct RawGoogleResults
{
string version_;
string status;
string sig;
string[string][][string] table;
}
enum json =
{version:0.6,status:ok,sig:717451517,table:{cols:[{id:date,label:Date,type:date,pattern:},{id:query0,label:euro
crisis,type:number,pattern:}],rows:[{c:[{v:2004-01-02),f:January
2004},{v:0.0,f:0}]},{c:[{v:2004-02-02),f:February
2004},{v:0.0,f:0}]},{c:[{v:2004-03-02),f:March
2004},{v:0.0,f:0}]},{c:[{v:2004-04-02)...
auto table = deserialize!(JsonSerializer, RawGoogleResults)(json);
I cannot pass a string to deserialize (the documentation suggests an
input range should be fine):
http://vibed.org/api/vibe.data.serialization/deserialize
I have a feeling maybe deserialize doesn't do what I want, but what
should I be using instead. (I would like to parse the json and shove
the results in the struct above).
Thanks.
Laeeth.
Okay - figured it out from the source code.
auto results = deserialize!(JsonStringSerializer!string,
RawGoogleResults)(json);
and easier to write:
struct RawGoogleResults
{
string version_;
string status;
string sig;
//Json!array[string][][string] table;
Json table;
}
Yeah, it is not very intuitive. But it works.
Re: how call a c function with stdcall?
try extern(Windows) isntead of extern(C).
Re: BigInt and xor
On Tuesday, 24 March 2015 at 17:28:50 UTC, Dennis Ritchie wrote: On Tuesday, 24 March 2015 at 16:35:04 UTC, Ivan Kazmenko wrote: What exactly is not working? Everything works. I'm just a little forgotten properties of the operation xor. I just wanted to xor 1 each digit in the number of type BigInt, while I would like to store each number in the binary representation of the array BigInt. xor it with -1 instead of 1. (-1 is store as 0xfff..f with the classic modular arithmetic)
Re: Need help with DLANGUI
On Monday, 23 February 2015 at 19:41:30 UTC, Eric wrote: I have been trying out dlanui, and I am able to create an image with FreeImage and display it with an ImageWidget. However this requires that I write the image out to disk, and then load it again to display it. Is there any way I can update or create the image in memory without going to disk? Thanks, Eric Hello, Sorry for delayed answer. Is your question still actual? You can use something like // create RGBA drawing buffer ColorDrawBuffer buf = new ColorDrawBuffer(width, height); // copy pixels into buf from your custom image // . // put into DrawBufRef DrawBufRef imageDrawBuf = buf; // create image drawable DrawableRef myCustomImageDrawable = new ImageDrawable(imageDrawBuf); // set drawable of ImageWidget imageWidget.drawable = myCustomImageDrawable; There was code in dlangui.graphics.image which could copy FreeImage images to ColorDrawBuf, but in recent version it's removed. You can check github revision history to get proper code. BTW, why do you need FreeImage to create image? Isn't it just possible inside dlangui?
