Re: Simulating multiple inheritance
On 03/31/2012 10:05 AM, Andrej Mitrovic wrote:
This is related to wrapping wxWidgets.
One issue with the new wxWidgets 2.9.x series is that there seem to be
more multiply-inherited classes than before
As Jacob already said mixin templates and Interfaces are the way to go.
I think you have to define the mixin template as
*mixin* template mixin_name.
interface Baz
{}
mixin template Baz()
{
// In case that you need to access the parent class
alias typeof(this) ThisClass;
}
class Bar
{}
class Foo : Bar , Baz
{
mixin Baz;
}
Good to know that you are still develop the wxWidget bindings. Keep us
informed.
Re: Simulating multiple inheritance
On 03/31/2012 10:05 AM, Andrej Mitrovic wrote:
One issue with the new wxWidgets 2.9.x series is that there seem to be
more multiply-inherited classes than before
A bit more complete snippet.
interface Foo
{
void doFoo();
}
// Foo implementation
mixin template FooMixin()
{
alias typeof(this) thisClass;
void doFoo()
{
thisClass.init();
}
}
class Bar
{
void doFoo() {}
}
class Baz :Bar, Foo
{
alias Bar.doFoo BarFoo;
mixin FooMixin;
void init() {}
}
hth
opDispatch(string name, E...) (E e) question.
How do I call opDispatch(string name, E...)(E elements) ?
What I want to archive is to call f.i. fm.list with an arbitrary number
of arguments without using
fm.list(1, abc, 4L, 3.33);
Instead I would prefer
fm.list = (1, abc, 4L, 3.33);
Is this somehow possible ?
import std.variant;
import std.conv;
auto fm = FlexMap();
fm.ten = 10;
fm.ten = [Ten, Zehn, Tein];
fm.list = [20, 10, 2, 2, 44 ] ;
fm.list = Hello opDispatch;
struct FlexMap
{
Variant[] [string] map;
Variant[] opDispatch(string name)()
{
return map[name];
}
Variant[] opDispatch(string name, E...)(E elements)
{
foreach(element; elements)
map[name] ~= to!Variant(element);
return map[name];
}
Variant[] opDispatch(string name, T) (T t)
{
map[name] ~= to!Variant(t);
return map[name];
}
}
Another question :
How do I bring in :
opDispatch(string name, T) (T[] t)
into FlexMap ?
TIA, Bjoern
Re: opDispatch(string name, E...) (E e) question.
On 03/25/2012 02:04 PM, James Miller wrote:
On 26 March 2012 09:45, blsbizp...@orange.fr wrote:
How do I call opDispatch(string name, E...)(E elements) ?
What I want to archive is to call f.i. fm.list with an arbitrary number of
arguments without using
fm.list(1, abc, 4L, 3.33);
Instead I would prefer
fm.list = (1, abc, 4L, 3.33);
You can use @property on opDispatch to use setter/getter notation,
however I wouldn't rely on that functionality long-term if you want to
keep the same function-call syntax (since -property flag is supposed
to enforce proper parenthesis use on `@property`s).
fm.list = (1, abc, 4L, 3.33);
I'm hoping you mean `fm.list = [1, abc, 4L, 3.33];` I think that
using the right template parameters, you can use the same code for
(T...)(T el) and (T)(T[]), I just can't remember what that is...
Ouch, yep, I mean [1, abc, 4L, 3.33]
But I have no clue how to implement it.
Another question :
How do I bring in :
opDispatch(string name, T) (T[] t)
--
James Miller
(T) (T[] t) AND (T) (T t) seems not to work.
snip
struct FlexMap
{
Variant[] [string] map;
Variant[] opDispatch(string name)()
{
return map[name];
}
Variant[] opDispatch(string name, E...)(E elements)
{
foreach(element; elements)
map[name] ~= to!Variant(element);
return properties[name];
}
Variant[] opDispatch(string name, T) (T t)
{
map[name] ~= to!Variant(t);
return map[name];
}
// No go
Variant[] opDispatch(string name, T) (T[] t) {}
}
Re: opDispatch(string name, E...) (E e) question.
On 03/25/2012 02:59 PM, James Miller wrote: Ok, so looking here:http://dlang.org/function.html, I have determined that, if you are using Variant arrays (though I'm not sure if you can do that using literals...) you can use the syntax from this example: Thanks James.. will give it tomorrow a new try. At least Variant[] va = [1, 2.3222, abc]; is not working. Guess I have to give up the opDispatch() thing and create it a bit more traditional :) Bjoern oh, beside you mean : opDispatch(string name, T) (T[] t...)
Re: opDispatch(string name, E...) (E e) question.
Thanks Artur,
On 03/25/2012 03:18 PM, Artur Skawina wrote:
On 03/25/12 22:45, bls wrote:
How do I call opDispatch(string name, E...)(E elements) ?
What I want to archive is to call f.i. fm.list with an arbitrary number of
arguments without using
fm.list(1, abc, 4L, 3.33);
Instead I would prefer
fm.list = (1, abc, 4L, 3.33);
Is this somehow possible ?
Well, you can do
template ID(A...) { alias A ID; }
fm.list = ID!(1, abc, 4L, 3.33);
but is that any better than your first version above?...
Not sure...
Maybe if we rename it
fm.list = Values!(1,2,true);
But I does not work.. Seems I am not able to figure out the opDispatch
signature.
Think I will rewrite it without using opDispatch.
artur
QR code based twitter --slightly OT
Twitter messages are pretty limited, so I think it could make sense to implement a QR code based twitter like information-service. D could be the tool of choice, But does this idea makes sense at all ? I Think so, but would like to hear your opinion. TIA Bjoern
Re: Class Initialization
On 01/31/2012 12:41 PM, Trass3r wrote: *whispers gee dee c* windows binaries please...
Re: Partial classes
On 01/29/2012 01:43 PM, Mars wrote:
Hello everybody.
Quick question, is there anything like C#'s partial classes in D?
Mars
As already said template mixins are close to partial classes.
A snippet. HTH
import std.stdio, std.cstream;
void main(string[] args)
{
auto bar = new Bar();
writeln(bar.onClick());
// Lets the user press Return before program stops
din.getc();
}
mixin template FooMixin()
{
void initCommonControls()
{
}
string onClick()
{
return Clicked;
}
}
class Foo
{
mixin FooMixin;
}
class Bar : Foo
{
}
Re: OOP Windows
On 01/16/2012 09:07 AM, Andrej Mitrovic wrote: Oh I thought that tutorial was about MFC/ATL, but it seems to use the regular C API. I might look into this to add it to the DWinProgramming project if it's worthwhile. I think it is worth a closer look. Especially Bartosz Milewski ActiveObject class. https://www.relisoft.com/win32/active.html OT @Andrej The MONO folks are using Cairo to rebuild MS NET System.Drawing and System.Drawing2D. I wonder if this could be an approach for DGUI. I quess my question is : using CAIRO or GDI+ as Graphic engine for DGUI. TIA Bjoern
Re: Taking a function or delegate as argument.
On 01/10/2012 06:53 AM, Jacob Carlborg wrote:
On 2012-01-10 14:48, simendsjo wrote:
On 10.01.2012 14:43, Mike Parker wrote:
On 1/10/2012 10:05 PM, simendsjo wrote:
If I want to have a method taking a callback function, I have to
specify
if it should take a function or delegate even if I don't really care.
What's the best way to accept either? I cannot see any wrapper for
something like this in std.typecons.
The simple way:
void callback(int i, void delegate(int) dg)
{
dg(i);
}
void callback(int i, void function(int) fn)
{
void wrap(int j)
{
function(j);
}
callback(i, wrap);
}
Yeah, but a bit tedious.. I found toDelegate:
http://dlang.org/phobos/std_functional.html#toDelegate
Or make it a template parameter and check if it's callable using
std.traits.isCallable.
What's wrong with toDelegate ? Seems to be pretty handy.
//simple snip
import std.functional;
int main()
{
int delegate( int i) dg;
alias dg callback;
callback = toDelegate(test);
writeln( callback( 12 ) );
readln();
return 0;
}
int test(int i) { return 30 +i;}
Re: Using delegate for WindowProc - possible ?
On 12/28/2011 03:45 PM, Tal wrote:
Can I do something like this :
__
extern (Windows) LRESULT delegate (HWND hWnd, UINT message, WPARAM wParam,
LPARAM lParam) MyWinProcDelegate;
this() {
MyWinProcDelegate =Events;
}
extern (Windows) LRESULT Events (HWND hWnd, UINT message, WPARAM wParam,
LPARAM lParam) {
MessageBoxA(null , Success!!! , null ,0);
return DefWindowProcA(hWnd, message, wParam, lParam);
}
__
The Events() doesn't seem to fire... am I missing something ?
Maybe std.functional toDelegate() ?
auto DelegateToUse = toDelegate(Events);
Not sure how much sense this makes...
If I recall correctly I have used
alias extern windows LRESULT delegate() callback;
callback = cbfunc;
As said I am not sure, hth Bjoern
Re: Using delegate for WindowProc - possible ?
On 12/28/2011 03:45 PM, Tal wrote:
Can I do something like this :
__
extern (Windows) LRESULT delegate (HWND hWnd, UINT message, WPARAM wParam,
LPARAM lParam) MyWinProcDelegate;
this() {
MyWinProcDelegate =Events;
}
extern (Windows) LRESULT Events (HWND hWnd, UINT message, WPARAM wParam,
LPARAM lParam) {
MessageBoxA(null , Success!!! , null ,0);
return DefWindowProcA(hWnd, message, wParam, lParam);
}
__
The Events() doesn't seem to fire... am I missing something ?
ok next try : At least it compiles ..
import std.functional;
int main(string[] argv)
{
extern(Windows) int delegate() dg;
alias dg callback;
callback = toDelegate(test);
return 0;
}
extern(Windows) int test() { return 42;}
hth, bjoern
Re: Using delegate for WindowProc - Is possible and fun!
On 12/28/2011 03:45 PM, Tal wrote:
Can I do something like this :
__
extern (Windows) LRESULT delegate (HWND hWnd, UINT message, WPARAM wParam,
LPARAM lParam) MyWinProcDelegate;
this() {
MyWinProcDelegate =Events;
}
extern (Windows) LRESULT Events (HWND hWnd, UINT message, WPARAM wParam,
LPARAM lParam) {
MessageBoxA(null , Success!!! , null ,0);
return DefWindowProcA(hWnd, message, wParam, lParam);
}
__
The Events() doesn't seem to fire... am I missing something ?
Hi Tal.
I have added an other example using array of delegates. I guess I know
what you want to do... so do not miss the end of the document. Enjoy.
import std.stdio;
import std.functional;
int main(string[] argv)
{
// array of delegates
extern(Windows) int delegate( int i)[] dg;
alias dg callback;
// function to delegate
callback ~= toDelegate( test ); // std.functional
writeln( callback[0]( 1 ) );
callback ~= toDelegate( inc );
writeln( callback[1] (0) );
writeln (callback[0]( 1 ) );
readln();
return 0;
}
extern(Windows) int test(int i) { return 41 +i;}
extern(Windows) int inc(int i) { return ++i;}
// Now an associative array of delegates indexed by (of course) HWND ;)
extern (Windows)
LRESULT delegate (HWND hWnd, UINT message, WPARAM wParam,LPARAM
lParam)[HWND] dg;
alias dg MyWinProcDelegate;
bjoern
Re: use of D for ropes data structures
On 10/19/2011 06:22 AM, Jay Norwood wrote: can someone propose the appropriate D features or libraries that would support a native D implementation of the ropes structures described in this Sgi C++ library. http://www.sgi.com/tech/stl/Rope.html From the library std.range -Iteration std.container (RB tree, and interesting documentation), Language features, Templates hth,Bjoern
Re: C Bitfields in D
On 08/12/2010 02:23, Simen kjaeraas wrote: Andrej Mitrovic andrej.mitrov...@gmail.com wrote: Cool! But, when is ctod.exe coming out? :p That should have been cpptod. ;) As soon as you write it. See d.announce SWIG for D :)
Re: [SO] D support for COM
On 13/09/2010 20:58, Jesse Phillips wrote: There is a question on using COM with D and how it simplifies using COM[1]. I haven't done it myself and don't have any examples. http://stackoverflow.com/questions/3698910/d-support-for-com http://www.dsource.org/projects/juno/wiki Juno contains a TypeLibraryImport tool and set of modules making COM client respective server programming a piece of cake. Unfortunately Juno is not in sync with the latest D2 compiler. Bjoern
alias this ...
// ..snip
point3D p; // Da
p.x = 10;
p.y = 20;
p.z = 100;
point3D = = new point3D(10,20,30) // Njet
//etc
}
struct point {
int x;
int y;
}
struct point3D {
point p;
alias p this;
int z;
// NOPE :(
/*static point3D opcall(int _x, int _y, int _z) {
// ..snip
}*/
// NOPE :(
/*
this(int _x, int _y, int _z) {
// .. snip
}
*/
}
would be nice to use alias this as struct inheritance substitute,
especially in conjunction with Implements!()
But maybe I don't get the alias this thingy. So what's my mistake TIA
Re: alias this ...
On 06/09/2010 22:36, BLS wrote: point3D = = new point3D(10,20,30) // Njet //etc should be point3D p3 = new point3D(10,20,30) // Njet sorry
Re: Generic collection/element function signatures in D2 versus D1
On 05/09/2010 02:16, Jonathan M Davis wrote:
void foo(T)(T[] collection, T elem)
{
// Blah, whatever
}
I am curious, how this will look and feel once inout is working ?
inout void foo(T)(inout(T)[] collection, inout T elem)
{
// Blah, whatever}
}
Re: Grokking concurrency, message passing and Co
On 12/07/2010 10:35, Justin Spahr-Summers wrote: On Mon, 12 Jul 2010 00:03:53 +0200, BLSwindev...@hotmail.de wrote: On 11/07/2010 21:29, Philippe Sigaud wrote: I tried this because I was reading an article on Scala's actors, where they talk about millions of actors. I guess they are quite different. Google for fibers or have a look at the dreactor project on dsource. Tango has fiber support (afaik). hth bjoern Phobos2 has a Fiber class in core.thread as well. Thanks Justin, just wish that core. documents are comparable to the std. ones. (At least) Beside.. why core is not documented at all ? bjoern
Re: Grokking concurrency, message passing and Co
On 12/07/2010 14:18, Lars T. Kyllingstad wrote: I'm pretty sure they will be soon, perhaps even in the next release: http://www.dsource.org/projects/druntime/changeset/321 -Lars Thanks Lars.. Good news ! Hope the auto x = whatever(); // thing for ddoc is also solved than..
Re: std.pattern.. templated publisher subscriber pattern, adding events to collections
@ Dmitry
Thanks for all the feedback Dmitry. Seems that we have similar projects
in mind :) (maybe we can talk about the GUI project.. mine is similar to
win32++ at http://sourceforge.net/projects/win32-framework/)
However : Like you I would prefer to use something like ..
void delegate(const ref message) CallBack;
CallBack[] cb;
@Jakob
Adding some delegates to our list (D dyn. array) like in C# is a piece
of cake..
But keep in mind that we also need removeObserver() in order to
implement the Observer pattern. And removing makes the difference.
The question is now :
How do we identify our Observer object in order to remove..
possible solutions :
1) passing the object instance to the mixin template. (as shown in my
code) adding of course a : toHash() method.
2)
adding a GUID to the delegate..
3)
...
Dmitry, I think
YOUR :
final class Observable(Cont){
Cont cont;
//here goes your current Publisher stuff
//...
alias Cont!ElementType T;
static if(__traits(compiles,cont.insert(T.init)))//some such ...
need to test if it has this method
SOLUTION
is very hackish. (Beside, like IsForwardRange!R )
IMHO a mixin template is a more clean solution.
BUT this requires that container/collection classes are not final.
Well, even for final classes there is still the option to implement a
decorator pattern! But the decorator pattern makes code quite unreadable...
However, ATM I am thinking about how we can you use std.concurrent
message passing stuff...
Finally
Would be nice if we can write a few LOC together! ??
bjoern
PS Sure the Publisher/Observable mixin has to work for structs too.
std.pattern.. templated publisher subscriber pattern, adding events to collections
Hi,
Andrei brings in the idea of std.pattern. Seems that this module is
stalled; Unfortunately !
However I would like to enhance collection classes (likewise
dcollections) with a Publisher - Subscriber pattern (signal - slot, or
observer pattern) , if you prefer)
Hope the idea of enhancing collections with events become clear with the
following snippet.
---I am able to spend just a few hours a month with D programming.. in
other words, please don't kill me ;)
Untested Draft code which requires a lot of help and ,more important,
feedback from you.
struct publisherMsg(T) {
T data;
Action a;
}
mixin template Publisher(T) {
private :
enum Action = {INSERT, UPDATE, DELETE, READONLY};
//alias typeof(this) PT;
struct receiver {
Object o;
callback cb;
// opCall() or this() ?
}
receiver[] subscriber;
publisherMsg!(T) msg;
alias void delegate(ref msg) callback;
void addSubscriber(object o, callback cb) {
//subscriber ~= o;
}
void publish(T t, Action act) {
foreach (object o ; subscriber)
{
// create and send message
}
}
}
mixin template Subscriber() {
// see UndoList
}
final class Stack(T, bool observable = false ) /+ should use alias +/ {
T[] data;
static if (observable) mixin Observable!T;
void push(T t) {
publish(t, Action.INSERT)
}
T pop() {
}
bool empty() {
}
T top() {
}
size_t size() {
}
}
/// Undo list will receive every pushed or popped item (T and Action)
class UndoList(T) {
private:
T[] data;
// should be part of the subscriber mixin template.
publisherMsg!T stackMessage;
void delegate(ref stackMessage) dg;
alias Stack!(int) IntegerStack;
IntegerStack intstack = new IntegerStack;
private this() {
dg = this.feedback;
}
public void feedback(ref stackMessage msg ) {
writefln(push or pop action);
}
}
-Bjoern
Re: std.pattern.. templated publisher subscriber pattern, adding events to collections
Okay a bit better snippet than before. snippet should be almost
functional..
/*
Hi,
Andrei brings in the idea of std.pattern. Seems that this module is
stalled; Unfortunately !
However I would like to enhance collection classes (likewise
dcollections) with a Publisher - Subscriber pattern (signal - slot, or
observer pattern) , if you prefer)
Hope the idea of enhancing collections with events become clear with the
following snippet.
!!! I am able to spend just a few hours a month with D programming.. in
other words, please don't kill me :)
Untested Draft code which requires a lot of help and ,more important,
feedback from you.
*/
struct publisherMsg(T) {
T data;
Action a;
}
mixin template Publisher(T) {
private :
enum Action = {INSERT, UPDATE, DELETE, READONLY};
//alias typeof(this) PT;
struct receiver {
Object o;
callback cb;
}
receiver[] subscriber;
publisherMsg!(T) msg;
alias void delegate(const ref msg) callback;
void addSubscriber(object o, callback cb) {
//subscriber ~= o;
}
void publish() {
foreach (object o ; subscriber)
{
// create message and send message
}
}
}
mixin template Subscriber() {
// see UndoList for implementation
}
final class Stack(T, bool observable = false ) {
T[] data;
static if (observable) mixin Observable!T;
void push( T t) {
data ~= t;
publish(t, Action.INSERT);
}
T pop() {
publish(t, Action.DELETE);
//...
}
bool empty() {
}
T top() {
publish(t, Action.READONLY);
//...
}
size_t size() {
}
}
// Undo list will receive every pushed or popped item -data and action)
class UndoList(T) {
private:
T[] data;
/// should be part of the sunscriber mixin templates.
publisherMsg!T stackMessage;
void delegate(const ref stackMessage) dg;
alias Stack!(int) IntegerStack;
IntegerStack intstack = new IntegerStack;
private this() {
dg = this.feedback;
// SUBBSCRIBE Stack(T) push and pop events.
intstack.addSubscriber(this, dg);
}
public void feedback(const ref stackMessage msg ) {
writefln(Action);
}
}
Re: std.pattern.. templated publisher subscriber pattern, adding events to collections
Hi Dimitry, thanks for the feedback! Please have a look at the new snippet (just posted) msg is a ref parameter cause it is filled in our example from Stack. The Publisher mixin HOST. In other words. Where ever you mixin the Publisher template a message will be broad casted to all subscribers containing 2 information. 1 ) a value of type T, and an enum value INSERT, DELETE etc... will read your comments tomorrow more carefully.. have to sleep now.) bjoern
Re: MS VirtualFree(), VirtualAlloc()
On 02/07/2010 20:11, BLS wrote: Hi, for reasons I don't completely understand I would like to implement a BIP Buffer in D2. ;) well async IO is the use case .. I think. How can I allocate/free buffer-space from virtual memory ? What I am looking for is a way to do platform independent allocating of memory from the virtual address space. Like - VirtualAlloc/Free() in MS Win. Thanks in advance, Bjoern mmap or mallloc is what I get.. Pretty interesting. shit
MS VirtualFree(), VirtualAlloc()
Hi, for reasons I don't completely understand I would like to implement a BIP Buffer in D2. ;) well async IO is the use case .. I think. How can I allocate/free buffer-space from virtual memory ? What I am looking for is a way to do platform independent allocating of memory from the virtual address space. Like - VirtualAlloc/Free() in MS Win. Thanks in advance, Bjoern
dcollections ArrayList pb with mixin template
Hi, I have a problem with a mixin template. More exact with an
Arraylist!T within a mixin template.
Given.
void main() {
auto p = new Person(Hans, 32);
p ~= new Person(Steve, 40);
p ~= new Person(Bjoern, 101);
}
class Person {
private string _name;
private uint _age;
mixin TLinkList;
this(string name, uint age) {
this._name = name;
this._age = age;
}
}
mixin template TLinkList() {
alias typeof(this) T;
alias ArrayList!T TList;
T[] pa;
auto pl = new TList(pa); // This does not work !
void opCatAssign(T v) {
pa ~= v;
}
}
Error: non-constant expression new ArrayList(pa)main.d
Ideas ?
Thanks Bjoern
Re: dcollections ArrayList pb with mixin template
On 01/07/2010 22:59, Steven Schveighoffer wrote:
On Thu, 01 Jul 2010 15:36:53 -0400, BLS windev...@hotmail.de wrote:
Hi, I have a problem with a mixin template. More exact with an
Arraylist!T within a mixin template.
Given.
void main() {
auto p = new Person(Hans, 32);
p ~= new Person(Steve, 40);
p ~= new Person(Bjoern, 101);
}
class Person {
private string _name;
private uint _age;
mixin TLinkList;
this(string name, uint age) {
this._name = name;
this._age = age;
}
}
mixin template TLinkList() {
alias typeof(this) T;
alias ArrayList!T TList;
T[] pa;
auto pl = new TList(pa); // This does not work !
void opCatAssign(T v) {
pa ~= v;
}
}
Error: non-constant expression new ArrayList(pa) main.d
Ideas ?
Thanks Bjoern
I'm thinking it has to do with you trying to create a member with that
line.
I think a member initializer has to be a constant expression, like int i
= 1. Anything else has to be done in the constructor. This kinda sucks,
because you can't initialize members with their defaults where you
declare them, but it's the way D works.
-Steve
Thanks for the feedback Steve.
IMHO it should work.. One reason is that C.E. Miller has created a
Circularly-linked list module, containing a portable linked list
template mixin. Indeed Christophers implementation is different in that
the LinkList is part of the mixin template...
http://www.dprogramming.com/list.php
2) Commenting the auto pl = new TList() line out makes the snippet work.
mixin template TLinkList() {
alias typeof(this) T;
alias ArrayList!T TList;
T[] pa;
//auto pl = new TList(pa); // NOW IT WORKS !
void opCatAssign(T v) {
pa ~= v;
}
Well I am a D noob. Have to investigate a bit more, and of course any
help is welcome :)
Bjoern
Re: dcollections ArrayList pb with mixin template
On 02/07/2010 00:26, bearophile wrote: Steven Schveighoffer: I think a member initializer has to be a constant expression, like int i = 1. Anything else has to be done in the constructor. There are the static constructors too, for modules, structs, classes. Bye, bearophile Hi bearophile, I don't understand (in this context) . Can you please elaborate a bit more ? thanks bjoern
dcollections ArrayList conating array of classes/structs
Hi,
IMHO ArrayList has a bug. Just declaring ArrayList!B bl, raises an
error. But maybe I am wrong.. Nevertheless I 've filed a ticket. In case
that I switch from class to struct also std.algorithm is involved.
class AListTest {
alias ArrayList!B BList;
BList bl;
this() {}
}
class B {
string _name;
this(string name) {
this._name = name;
}
}
Error 1 Error: cannot implicitly convert expression (this._array[0u]) of
type const(B) to main.B
D:\dmd2\windows\bin\..\..\src\phobos\dcollections\ArrayList.d 772
Error 2 Error: cannot implicitly convert expression
(this._array[__dollar - 1u]) of type const(B) to main.B
D:\dmd2\windows\bin\..\..\src\phobos\dcollections\ArrayList.d 780
@property and interfaces
Just wonder how to translate this C# snippet into D..
//C#
public interface IBindingList {
bool AllowEdit {
get;
}
}
//D2
interface IBindingList {
@property bool allowEdit();
}
Is this correct ? I think in C# AllowEdit() takes tare that you don't
implement a setter. Seems to be impossible in D.
Thanks Bjoern
Re: @property and interfaces
sorry for making so much noise.. figured it out by myse4lf.
interface IBindingList {
@property bool AllowEdit();
//@property bool AllowEdit(bool enable);
//remove // to enable setter
}
class A : IBindingList {
private bool _allowEdit;
@property {
bool AllowEdit() { return _allowEdit; }
//bool AllowEdit(bool enable) { return _allowEdit = enable; }
}
}
bjoern
On 29/06/2010 12:11, BLS wrote:
Just wonder how to translate this C# snippet into D..
//C#
public interface IBindingList {
bool AllowEdit {
get;
}
}
//D2
interface IBindingList {
@property bool allowEdit();
}
Is this correct ? I think in C# AllowEdit() takes tare that you don't
implement a setter. Seems to be impossible in D.
Thanks Bjoern
Re: @property and interfaces
On 29/06/2010 12:32, Jonathan M Davis wrote:
So, there certainly won't be any restriction on
having a getter or setter in a class if an interface it implements declared only
one. It's just that you'll only be able to use the one that's part of the
interface if you're using a reference of the interface type rather than the
implementing class.
Hi Jonathan,
interesting : this snippet compiles.
interface IBindingList {
@property bool AllowEdit();
class A : IBindingList {
private bool _allowEdit;
@property {
bool AllowEdit() { return _allowEdit; }
bool AllowEdit(bool enable) { return _allowEdit = enable; }
}
}
But this one NOT.
interface IBindingList {
@property bool AllowEdit();
@property bool AllowEdit(bool enable);
}
class A : IBindingList {
private bool _allowEdit;
@property {
bool AllowEdit() { return _allowEdit; }
}
}
IMO this is bad design.
bjoern
Re: @property and interfaces
On 29/06/2010 14:08, Steven Schveighoffer wrote:
Besides, try to do this in C#:
@property int value() {return _x;}
@property int value(int x) { return _x = x;}
@property int value(string s) { return _x = to!int(s);}
:) D's properties are so much better...
-Steve
Ok, convinced ;)
Re: @property and interfaces
Hi bearophile, sorry for my ignorance, but what is the difference between @disable and simply deleting the line ? where can I read more about @disable ? thanks, bjoern
C# Indexers. how to implement them in D.. also property related.
Hi, in C# you can do some thing like this.
public interface IDataErrorInfo
{
// INDEXER
string this[string columnName] { get; }
}
}
how to translate this into D2 ?
thanks in advance, bjoern
Re: C# Indexers. how to implement them in D.. also property related.
On 29/06/2010 15:27, Steven Schveighoffer wrote:
string opIndex(string columnName);
yeah this is what I did, too..
However defined as ;
interface I1 {
string opIndex(string columnName);
}
is a no go. So can we say operator overloading within interfaces is not
allowed in D2 ?
thanks again Steve.. try to learn the interface/property stuff.
Re: C# Indexers. how to implement them in D.. also property related.
On 29/06/2010 15:35, BLS wrote:
On 29/06/2010 15:27, Steven Schveighoffer wrote:
string opIndex(string columnName);
yeah this is what I did, too..
However defined as ;
interface I1 {
string opIndex(string columnName);
}
is a no go. So can we say operator overloading within interfaces is not
allowed in D2 ?
thanks again Steve.. try to learn the interface/property stuff.
Jeez, my mistake.. forget to create the implementation. sorry!
dcollections problem
Hi
- probably Steve :)
I have problem in compiling a little programm using dcollection.LinkList.
(similar problem appears when I use dcollections.ArrayList)
D2.047
Linker error..
Error 1 Error 42: Symbol Undefined _D12dcollections8LinkList7__arrayZ
Error 2 Error 42: Symbol Undefined
_D12dcollections8LinkList12__ModuleInfoZ
// LinkList use...
import dcollections.LinkList;
final class LoadBalancer {
alias LinkList!Server ServerList;
private ServerList sl;
static this() {
synchronized lb = new LoadBalancer;
}
static LoadBalancer opCall() {
return lb;
}
private this() {
sl = new ServerList;
sl.add( new Server() );
...
}
Thanks, Bjoern
Re: dcollections problem
On 29/06/2010 20:19, Steven Schveighoffer wrote: Are you linking against dcollections? It looks like you are not... No. BTW, you can use dcollections' ticket tracking system for things like this instead of sending to the newsgroup :) Will do. Thanks Steve bjoern
dcollections how to LinkList // port c# code
Hi,
in C# this is common.
private ListServer _servers;
_servers = new ListServer
{
new Server{ Name = ServerI, IP = 120.14.220.18 },
new Server{ Name = ServerII, IP = 120.14.220.19 },
new Server{ Name = ServerIII, IP = 120.14.220.20 },
new Server{ Name = ServerIV, IP = 120.14.220.21 },
new Server{ Name = ServerV, IP = 120.14.220.22 },
};
D2 so far..
import dcollections.LinkList;
class LoadBalancer {
alias LinkList!Server ServerList;
private ServerList sl;
this() {
sl = new ServerList;
sl.add( new Server() );
...
}
Do I really have to create something like this
auto x = new Server(); x.Name = Blah; x.IP = 120.14.220.22;
s1.add(x)
(Name and IP are Server properties.)
thanks
bjoern
Re: dcollections how to LinkList // port c# code
On 29/06/2010 22:12, Steven Schveighoffer wrote:
For now, can you do something like this?
sl = new ServerList;
sl.add([
new Server(ServerI, 120.14.220.18),
new Server(...)
...
]);
Hi Steve, I think this should work, however I got very strange err. msg.
in file ArrayList.d Have to stop now..need some sleep.
BTW the new constructor stuff would be nice to have.
//current code.
import std.stdio;
import std.random;
import dcollections.ArrayList;
import dcollections.LinkList;
void main() {
auto b1 = LoadBalancer();
auto b2 = LoadBalancer();
auto b3 = LoadBalancer();
// Confirm these are the same instance
if (b1 == b2 b2 == b3 ) {
writeln(Same instance\n);
}
// Next, load 15 requests for a server
for (int i = 0; i 15; i++) {
string serverName = b1.nextServer.servername;
writeln(Dispatch request to: ~ serverName);
}
}
// D2 singleton
final class LoadBalancer {
private static LoadBalancer lb;
alias ArrayList!Server ServerList;
private ServerList sl;
static this() {
synchronized lb = new LoadBalancer;
}
static LoadBalancer opCall() {
return lb;
}
private this() {
sl = new ServerList;
sl.add([
new Server(ServerI, 120.14.220.18),
new Server(ServerII, 121.14.220.18)
]);
}
@property
{
Server nextServer() { return sl[uniform(0, sl.length)]; }
}
private class Server {
private string _name, _id;
this(string name, string id) {
this._name = _name;
this._id = id;
}
string servername() {
return _name;
}
/* OLD PROPERTY STUFF
@property
{
string servername(string sn) { return _name = sn; }
string servername() { return _name; }
string id(string id) { return _id = id; }
string id() { return _id; }
}
*/
}
}
cheers,bjoern
Re: dcollections how to LinkList // port c# code
On 29/06/2010 23:49, Steven Schveighoffer wrote:
One thing to note, ArrayList *does* accept an array as a constructor,
and it will actually use that array as its storage. This is so you can
wrap an array as a ArrayList and get the full dcollections
functionality from it.
Hi Steve
This is why I've switched from LinkList to ArrayList. (ArrayList is
simply cool)
also :
Server nextServer() { return sl[uniform(0, sl.length)]; }
is impossible with LinkList. ( sl is LinkList)
yeah opIndex on linked lists is simply slow.
However the snippet in the previous msg. does not compile.. will see later.
bjoern
@porperty problem..
Hi I have a forward reference pb in conjunction with @property.
Err msg is :
forward refrence to inferred return type of function call s1.servername.
any ideas ? beside, where are the @property docs ?
thanks, bjoern
final class LoadBalancer {
private static LoadBalancer lb;
private Server[] servers;
static this() {
synchronized lb = new LoadBalancer;
}
private this() {
Server s1 = new Server();
s1.servername = Server 1; // ERROR
servers ~= s1;
}
public static LoadBalancer getLoadBalancer() {
return lb;
}
@property nextServer() {
return servers[0];
}
class Server {
private string _name, _id;
@property servername(string name) {
_name = name;
}
@property servername() {
return _name;
}
}
}
Re: @prorperty problem..
On 28/06/2010 22:37, BLS wrote:
forward refrence to inferred return type of function call s1.servername.
any ideas ? beside, where are the @property docs ?
thanks, bjoern
ok moving the inner Server class (see prev. msg) in front of
LoadBalancer works.. seems to be a forward reference bug.
class Server {
private string _name, _id;
@property servername(string name) {
_name = name;
}
@property servername() {
return _name;
}
}
final class LoadBalancer {
private static LoadBalancer lb;
private Server[] servers;
static this() {
synchronized lb = new LoadBalancer;
}
private this() {
Server s1 = new Server();
s1.servername = Server 1; // NO PROBLEM
}
...
}
Re: @porperty problem..
On 28/06/2010 22:47, Steven Schveighoffer wrote:
houldn't this be
@property Server nextServer() {
Ouch, you are right.. Interesting enough that @property nextServer() {
return ...} compiles without giving any error message..
Anyway it seems to be a forward reference bug. moving the inner Server()
class in front of LoadBalancer eliminates the error msg.
bjoern
Re: @porperty problem..
On 28/06/2010 22:58, Steven Schveighoffer wrote:
I wasn't aware that @property implies auto. I guess that makes sense,
but I didn't consider it anything but a hint to the compiler about how
it could be called, not that did anything with the type.
Hm, this snippet does not compile :
class Server {
private string _name, _id;
@property servername(string name) {
_name = name;
}
@property string servername() {
return _name;
}
}
remove string from @property and it works.
On the other hand ..
@property Server nextServer() {
return servers[0];
}
compiles fine !
Guess we need the official documents...
Bjoern
Re: @porperty problem..
On 28/06/2010 23:00, Steven Schveighoffer wrote: http://www.digitalmars.com/d/2.0/function.html#property-functions -Steve Makes sense :) thanks
Re: @porperty problem..
On 29/06/2010 00:07, Simen kjaeraas wrote:
Maybe it's because you haven't added string to the setter? Just grasping
at straws here.
--
Simen
Hi Simen, yes, thats the prob. I just have not found the @property
docs.. thanks for all the help..
This snippet works now as expected.. D properties are just fine.
Bjoern
import std.stdio;
import std.random;
void main(string[] args)
{
LoadBalancer b1 = LoadBalancer.getLoadBalancer();
LoadBalancer b2 = LoadBalancer.getLoadBalancer();
LoadBalancer b3 = LoadBalancer.getLoadBalancer();
// Confirm these are the same instance
if (b1 == b2 b2 == b3 ) {
writeln(Same instance\n);
}
// Next, load 15 requests for a server
for (int i = 0; i 15; i++) {
string serverName = b1.nextServer.servername;
writeln(Dispatch request to: ~ serverName);
}
}
// D2 thread safe ?? singleton
final class LoadBalancer {
private static LoadBalancer lb;
private Server[] servers;
static this() {
synchronized lb = new LoadBalancer;
}
private this() {
Server s1 = new Server();
s1.servername = Server 1;
s1.id = ;
Server s2 = new Server();
s2.servername = Server 2;
servers ~= s1;
servers ~= s2;
}
public static LoadBalancer getLoadBalancer() {
return lb;
}
@property
{
Server nextServer() { return servers[ uniform(0,
servers.length) ]; }
}
// inner class
class Server {
private string _name, _id;
@property
{
string servername(string sn) { return _name = sn; }
string servername() { return _name; }
string id(string id) { return _id = id; }
string id() { return _id; }
}
}
}
Re: templates
On 19/04/2010 20:16, Ellery Newcomer wrote:
Hello.
Say I have a [struct] template T, which takes a param S.
Any T!(S) satisfies a certain template constraint W, so I can use any
T!(S) the same way. I want to be able to store heterogeneous T!(S) in a
single list. Is there any good way to express the type for this?
Why not simply...
class C(O)
{
private O obj;
object next;
this(O obj)
{
this.obj = obj;
}
...
invariant()
{
assert(this.obj fulfills W);
}
...
}
char* to string
HI, I would like to use some pbobos string based functions within an DLL. Unfortunately all I can do is to pass char* parameters from the callee side. Now I want to use f.i. std.regex export extern(windows) char* xxx() //Heck were is Jarret when I need him most ? D2,beside Björn
Re: char* to string
On 05/11/2009 00:11, BLS wrote:
char* xxx()
better
char* xxx(char* a, char* b)
{
string A =
}
gap buffer in D2
yep, mean it... has somebody done it before...to me it seems to be not as trivial as it looks on the very first view. (speed matters)
Re: gap buffer in D2
On 05/11/2009 01:04, Spacen Jasset wrote: BLS wrote: yep, mean it... has somebody done it before...to me it seems to be not as trivial as it looks on the very first view. (speed matters) Did one in C once for an editor (of course). Does that count? I might be able to find the code. It might not be pretty I can't remember. YEP,would be nice to have a look. thanks! would be interesting to have a 2 gaps buffer for beyond-end insert (append)
Re: Pointer to method C++ style
Sergey Gromov wrote:
Use case: I'm writing an ActiveX plug-in for a dynamic language. The
class Component : IUnknown
WOW!
But shouldn't you use
class Component : IDispatch
{
HRESULT QueryInterface( REFIID riid, LPVOID * ppvObj) {};
ULONG AddRef() {};
ULONG Release(){};
// plus IDispatch methods
// GetTypeInfoCount, GetTypeInfo, GetIDsOfNames, Invoke.
// to support late binding ?
}
instead ?
Beside, John C. (Juno library) is a specialist (guru) regarding this
topic. maybe he is willing to help.
However, I am _very_ interested in having/seeing the source of a very
basic ActiveX control. Any chance that you share the core implementation
with us ?
björn
Re: Pointer to method C++ style
Sergey Gromov wrote: Thu, 23 Jul 2009 12:37:42 +0200, BLS wrote: Sorry, I'm not a guru at all, so ActiveX was a misnomer. What I'm writing is a simple in-process server DLL which implements a couple of interfaces. Oh, that's sad. :( well, especially in this case I would suggest to have a look on this page : http://www.dsource.org/projects/juno/wiki/ComProgramming --- I think John's juno.com.server module contains almost everything you need. good luck
Re: Regex
Robert Fraser wrote: BLS wrote: Vladimir Voinkov wrote: std.regex can't be used in compile time function call. It's quite frustrating... see dsource.org .. afaik there is a compile time regex project. hth http://www.dsource.org/projects/scregexp But the generated functions aren't CTFE-compatible AFAIK. A CTFE regex engine would be um... tricky to say the least. About 50GB of memory tricky (on DMD, LDC has a GC... though, it's still just as slow with CTFE). Really, if you need that level of code manipulation, a preprocessor is probably a better choice. Ouch! Remaining question : std.regex can't be used in compile time function call Why this* don't work for you ? * http://www.digitalmars.com/d/2.0/templates-revisited.html (middle of the document / Regular Expression Compiler)
Re: Regex
Vladimir Voinkov wrote: std.regex can't be used in compile time function call. It's quite frustrating... see dsource.org .. afaik there is a compile time regex project. hth
Re: [SO] memory paging with D
BCS wrote: http://stackoverflow.com/questions/1057219/memory-paging-with-d I'm using D/Tango for catalog indexing, is there any library to aid with memory (RAM) paging for a dictionary which is in memory and can go up to 10gb while performing indexing? Why not using SQLite as memory db ?
Re: Simple file manipulation
Sam Hu wrote: I looked up in D2 in std.stdio,std.file,std.cstream and std.stream and try to find a very simple method which can read from a file once a value other than once an entire row.I just can not find it maybe this idea is wrong.Say how to simply read write key/value pairs to and from a file like this format: //file data.dat Tommy M 22 where the keys are name,gender and age while the values are Tommy,M ,22. I found there is methods that can read from a file once an entire row.But is there a simple method which can read once a value?In C++ one can do like this: #include iosteam #include fstream using namespace std; ifstream inData; inData.open(data.dat); inDataname; inDatagender; inDataage; coutInfo:endl Name:nameendl Gender:genderendl Age:ageendl; IN D2 you can use std.file and slurp (cool name, beside) slurp reads an entire file into an array. // Load file; each line is an string followed by whitespace , another //string followed by whitespace and a int. auto a = slurp!(string, string, int)(data.dat, %s %s %s); Now you can go on an play a bit with the new range stuff. (std.range) Enjoy, Björn
Re: How to check for internet connectivity and download file?
Tyro[a.c.edwards] wrote: I've used Burton Radons' urllib in the past to get download files from the internet, however the library has atrophied and can no longer be used with DMD v2.029 (not how long it's been this way because I haven't tried to compile it since 2006). I'm wondering if someone could point me to an example of how to check for internet connectivity and if available download the latest version of a given file. Thanks in advance. Andrew What about PING ? Björn
C++ operator new
Hi,
I wonder if this is doable in D ?
class Cpp
{
public:
void* operator new(size_t n);
void* operator new(size_t n, void* p)
{ return p; }
}
Just guessing that operator new means this in D
class D
{
new(uint n);
new(uint n,void* p)
{ return p; }
}
Am I wrong ?
TIA, Bjoern
Re: Print a PDF
John schrieb: BCS Wrote: Reply to John, Hello! I'm wanting to use D to send a PDF to a printer. Is there an easy way to do this? Also, I may need to set which tray to go to and whether it should duplex or not. Could someone help me out? THANKS! You would do it the same way that it would be done in C. IIRC D has no special support for that. (If you need help hunting down windows bindings, there are s few people here who work on that kind of thing) Thanks! Is there anyone here familiar with the Windows bindings? The are bindings for the libharu pdf Have a look at dsource.org project AKI / hth, Bjoern
whois bulk queries, how to
Hi I want to do bulk queries on whois engines. Everthing works fine for a single request. whois(suneido.com) for instance. The problem is that the whois servers are disconnecting after 1 request. I know about a few desktop whois apps which are able to do bulk queries.. Questions is what is the big trick ? This seems to be a good kept secret. Any ideas ? Bjoern
