having problem with `std.algorithm.each`
It seems like `std.algorithm.each` is not executed in the example
below.
Could anyone tell why?
Thank you.
import std.algorithm;
void main(string[] args) {
int[] arr = [1, 2, 3, 4, 5];
arr.each!((ref e) => {
writeln(e); // does not print
++e;
})();
writeln(arr); // prints [1, 2, 3, 4, 5]
}
Re: having problem with `std.algorithm.each`
DMD 2.069.1 OS Win8.1 Enterprise
vibe.d-example illustrating Dynamic Textual Web-Interface
Can somebody please show a enlightening example of, so called, "revamp of the REST interface generator" added to release 0.7.26 at: http://vibed.org/blog/posts/vibe-release-0.7.26 I want to use vibe.d to add a modern dynamic web-interface to my knowledge graph I'm currently developing. More specifically I would like an interface that makes rich use of dynamic HTML. When the user changes the contents of a search/command-line text-field the client logic shall on the fly (after a certain delay) lookup related information with vibe.d-server and present the user with relevant hits or completions in a another part of page (HTML div-block). Does anybody have a similar vibe.d-project to be inspired from, in this regard?
Re: Classes as enums in D?
On Monday, 30 November 2015 at 08:08:20 UTC, Meta wrote:
class WhiteKey
{
private immutable int halfStepsToNext;
private immutable int halfStepsToPrevious;
enum
{
A = new WhiteKey(2, 2),
B = new WhiteKey(2, 1),
C = new WhiteKey(1, 2),
D = new WhiteKey(2, 2),
E = new WhiteKey(2, 1),
F = new WhiteKey(1, 2),
G = new WhiteKey(2, 2),
}
private this(int halfStepsToPrevious, int halfStepsToNext)
{
this.halfStepsToPrevious = halfStepsToPrevious;
this.halfStepsToNext = halfStepsToNext;
}
}
However, you do NOT want to do this, as everywhere you use
WhiteKey's members, a new object will be created. For example:
auto f = WhiteKey.A;
auto n = WhiteKey.A;
import std.stdio;
writeln(, " ", );
You're misinterpreting this:
enum X {
A = new Object,
B = new Object,
}
void main() {
import std.stdio;
writeln(cast(void*) X.A);
writeln(cast(void*) X.A);
}
# output:
470910
470910
You're print the address of `f` and `n` on the stack, not the
reference they're pointing to.
But it's true that enums of mutable _arrays_ do create a new
instance every time they're used:
enum X {
A = [1,2,3],
B = [4,5,6],
}
void main() {
import std.stdio;
writeln(X.A.ptr);
writeln(X.A.ptr);
}
# output:
7FD887F0E000
7FD887F0E010
Re: DUB, Platform specifications and dependencies
Am 24.11.2015 um 19:51 schrieb Zardoz:
Actually I'm trying to setup dub to not grab a dependency on Windows (
https://github.com/Zardoz89/DEDCPU-16/blob/master/dub.sdl ) :
name "dedcpu"
authors "Luis Panadero Guardeño"
targetType "none"
license "BSD 3-clause"
description "DCPU-16 tools"
subPackage {
name "lem1802"
description "Visual LEM1802 font editor"
targetType "executable"
targetName "lem1802"
excludedSourceFiles "src/bconv.d"
excludedSourceFiles "src/ddis.d"
dependency "gtk-d:gtkd" version="~>3.2.0" platform="posix"
libs "gtkd" platform="windows"
}
...
How ever, running dub on Windows (tested on two different machines),
ignores platform specification for gtk-d dependency . What I'm doing
wrong ?
Platform specifications are currently not supported for dependencies due
to the way the dependency resolver works. However, it is possible to use
platform specific configurations for this purpose:
name "dedcpu"
authors "Luis Panadero Guardeño"
targetType "none"
license "BSD 3-clause"
description "DCPU-16 tools"
subPackage {
name "lem1802"
description "Visual LEM1802 font editor"
targetType "executable"
targetName "lem1802"
excludedSourceFiles "src/bconv.d"
excludedSourceFiles "src/ddis.d"
libs "gtkd" platform="windows"
configuration "nogtk" {
platforms "windows"
}
configuration "gtk" {
platforms "posix"
dependency "gtk-d:gtkd" version="~>3.2.0"
}
}
Re: DateTime.opBinary
On Mon, 30 Nov 2015 01:30:28 -0800, Jonathan M Davis via Digitalmars-d-learn wrote: > On Sunday, November 29, 2015 23:53:41 Chris Wright via > Digitalmars-d-learn wrote: >> Unfortunately, ddoc doesn't automatically cross-reference these for >> you, >> which results in confusion. (As if it weren't confusing enough to have >> everything wrapped in templates with filters rather than simply using >> const(Duration).) > > Once TickDuration finally goes away, then functions like DateTime's > opBinary can be simplified to just take Duration. > > But until TickDuration and the few things that use it in their API have > gone through the deprecation process, we're stuck with it in places like > this. > > - Jonathan M Davis Or with explicit overloads, which would be easier to document and easier to read and as easy to maintain.
Re: Any D IDE on Mac OSX with debugging support?
On 16/11/2015 06:45, Vadim Lopatin wrote: Hello, Is there any IDE which allows debugging D apps on OSX? I'm trying Mono-D, but getting error "Debugger operation failed A syntax error in expression, near 'sizeof(void*)'" GDB is installed using homebrew. Probably, something is wrong with my gdb. When I'm trying to start debugging using console GDB interface - it fails with message about unsigned application. Is there any instruction how to get GDB working on OSX? Code completion and symbol lookups neither do not work on Mono-D / OSX. Does anyone managed to get it working? Best regards, Vadim Yes, DDT ( http://ddt-ide.github.io/ ) supports debugging on OSX, using GDB, but you have to install it with homebrew. If you have done it already, then it should work, but check this article as well: http://ntraft.com/installing-gdb-on-os-x-mavericks/ -- Bruno Medeiros https://twitter.com/brunodomedeiros
Re: Can't understand how to do server response with vibed
On Sunday, 29 November 2015 at 07:37:56 UTC, Suliman wrote: On Saturday, 28 November 2015 at 23:21:21 UTC, Sebastiaan Koppe wrote: On Saturday, 28 November 2015 at 19:05:59 UTC, Suliman wrote: And also I can't understand difference between HTTPClientRequest and HTTPServerRequest If the application (vibe.d) makes a request, it is the client. If the request is made to your application, it is the server. In your case your angular app is the client, and your vibe.d app is the server. Therefor, HTTPServer(Request|Response). Could you explain me about: HTTPServerRequest and HTTPRequest. I can't understand difference. No idea. Probably HTTPRequest provides common functionality for both HTTPServerRequest and HTTPClientRequest. Just guessing.
Re: vibe.d-example illustrating Dynamic Textual Web-Interface
On Monday, 30 November 2015 at 10:08:17 UTC, Nordlöw wrote: Can somebody please show a enlightening example of, so called, "revamp of the REST interface generator" added to release 0.7.26 at: http://vibed.org/blog/posts/vibe-release-0.7.26 I want to use vibe.d to add a modern dynamic web-interface to my knowledge graph I'm currently developing. More specifically I would like an interface that makes rich use of dynamic HTML. When the user changes the contents of a search/command-line text-field the client logic shall on the fly (after a certain delay) lookup related information with vibe.d-server and present the user with relevant hits or completions in a another part of page (HTML div-block). Does anybody have a similar vibe.d-project to be inspired from, in this regard? I have written a mpd (Music Player Daemon) client in D and just finished the web app (bar a couple of features). All of the rendering is done on the client and only json data is transmitted between server and web app. Just finished the WebSocket part so if anybody changes the music/volume/playlist, all clients update the interface. The code could use a cleanup/refactoring but everything is working. The D parts of interest are the MpdApiInterface1 and MpdApi1 classes in source/app.d For the JS parts you can start with source/index.js, but its full of ES6 classes and react code. So that might not be your cup of tea. In index.js there are mainly React Classes (basically html renderers) and React Container Classes (basically code handling input changes). In the source/actions folder there are some js files that call the server and modify state (volume/song). In the source/stores folder, some js files that only retrieve data. The js architecture if influenced by react/flux/facebook's, but I am toying with it to see what fits for me. Specifically I rely a lot on RxJS for the observables. For the project I decided to put js and d files in the same folders. That might not have been a good idea. Also dub has some issues with one of the D dependencies that I haven't updated in months. Code can be found here: https://bitbucket.org/skoppe/mpc/src
Re: vibe.d-example illustrating Dynamic Textual Web-Interface
On Monday, 30 November 2015 at 20:05:42 UTC, Sebastiaan Koppe wrote: Code can be found here: https://bitbucket.org/skoppe/mpc/src Looks good. Have you looked at Redux and Webpack? I am working on a Redux example and we have switched to Webpack and Redux at work and it is nice.
Re: DUB, Platform specifications and dependencies
On Monday, 30 November 2015 at 16:54:43 UTC, Sönke Ludwig wrote:
Am 24.11.2015 um 19:51 schrieb Zardoz:
Actually I'm trying to setup dub to not grab a dependency on
Windows (
https://github.com/Zardoz89/DEDCPU-16/blob/master/dub.sdl ) :
name "dedcpu"
authors "Luis Panadero Guardeño"
targetType "none"
license "BSD 3-clause"
description "DCPU-16 tools"
subPackage {
name "lem1802"
description "Visual LEM1802 font editor"
targetType "executable"
targetName "lem1802"
excludedSourceFiles "src/bconv.d"
excludedSourceFiles "src/ddis.d"
dependency "gtk-d:gtkd" version="~>3.2.0" platform="posix"
libs "gtkd" platform="windows"
}
...
How ever, running dub on Windows (tested on two different
machines),
ignores platform specification for gtk-d dependency . What I'm
doing
wrong ?
Platform specifications are currently not supported for
dependencies due to the way the dependency resolver works.
However, it is possible to use platform specific configurations
for this purpose:
name "dedcpu"
authors "Luis Panadero Guardeño"
targetType "none"
license "BSD 3-clause"
description "DCPU-16 tools"
subPackage {
name "lem1802"
description "Visual LEM1802 font editor"
targetType "executable"
targetName "lem1802"
excludedSourceFiles "src/bconv.d"
excludedSourceFiles "src/ddis.d"
libs "gtkd" platform="windows"
configuration "nogtk" {
platforms "windows"
}
configuration "gtk" {
platforms "posix"
dependency "gtk-d:gtkd" version="~>3.2.0"
}
}
Thanks!! I ended doing some minor change to get it working :
subPackage {
name "lem1802"
description "Visual LEM1802 font editor"
excludedSourceFiles "src/bconv.d"
excludedSourceFiles "src/ddis.d"
configuration "nogtk" {
targetType "executable"
targetName "lem1802"
platform "windows"
libs "gtkd"
}
configuration "gtk" {
targetType "executable"
targetName "lem1802"
platform "posix"
dependency "gtk-d:gtkd" version="~>3.2.0"
}
}
Re: vibe.d-example illustrating Dynamic Textual Web-Interface
On Monday, 30 November 2015 at 20:23:48 UTC, David DeWitt wrote: Have you looked at Redux and Webpack? I am working on a Redux example and we have switched to Webpack and Redux at work and it is nice. I know about both yes. Webpack would probably beat browserify, but I haven't gotten the time to migrate myself. Their hot code reloading looks good though. Isn't redux the client side for GraphQL? I followed it a bit but it being so fresh, decided to wait. A GraphQL interface generator for vibe.d would be nice.
Re: vibe.d-example illustrating Dynamic Textual Web-Interface
On Monday, 30 November 2015 at 20:38:12 UTC, Sebastiaan Koppe wrote: On Monday, 30 November 2015 at 20:23:48 UTC, David DeWitt wrote: Have you looked at Redux and Webpack? I am working on a Redux example and we have switched to Webpack and Redux at work and it is nice. I know about both yes. Webpack would probably beat browserify, but I haven't gotten the time to migrate myself. Their hot code reloading looks good though. Isn't redux the client side for GraphQL? I followed it a bit but it being so fresh, decided to wait. A GraphQL interface generator for vibe.d would be nice. Redux is luscious!!! It is a flux-like implementation but you dont have to deal with individual stores as the app's state lives in a single object tree. Once you go thru it you'll like it. https://github.com/rackt/redux https://github.com/xgrommx/awesome-redux
Re: isAllocator
On 01/12/15 3:23 AM, Tofu Ninja wrote:
On Monday, 30 November 2015 at 14:21:49 UTC, Tofu Ninja wrote:
Is there something like isInputRange for allocators, I tried looking
for something but couldn't find anything? If not, why not?
Aka, some way to check that type T is an allocator.
Doesn't look like it.
bool isAllocator(Alloc)() pure {
return __traits(compiles, {IAllocator alloc = new
CAllocatorImpl!Alloc;});
}
That should work however.
need help with Windows CreateNamedPipe Security attributes process with undefined symbols at compile time
Hi,
I've been trying to create a NamedPipe with security attributes
but at compile time throws:
Error 42: Symbol Undefined _InitializeSecurityDescriptor@8
Error 42: Symbol Undefined _SetSecurityDescriptorDacl@16
This is my code, I'm trying to do it using a class:
module asi.pipe;
import core.sys.windows.windows;
import core.sys.windows.winbase;
import core.stdc.stdlib;
class Pipe
{
private HANDLE hPipe;
private SECURITY_ATTRIBUTES sa;
this(string name)
{
CreatePipe(name);
}
private void CreatePipe(string pipename)
{
sa.lpSecurityDescriptor = malloc(SECURITY_DESCRIPTOR.sizeof);
InitializeSecurityDescriptor(cast(PSECURITY_DESCRIPTOR)sa.lpSecurityDescriptor,
1);
SetSecurityDescriptorDacl(cast(PSECURITY_DESCRIPTOR)sa.lpSecurityDescriptor,
TRUE, cast(ACL*)0, FALSE);
sa.nLength = sa.sizeof;
sa.bInheritHandle = TRUE;
CreateNamedPipeA(cast(char*)pipename,
PIPE_ACCESS_DUPLEX,
(PIPE_TYPE_BYTE |
PIPE_READMODE_BYTE | PIPE_WAIT),
PIPE_UNLIMITED_INSTANCES,
4096,
1536,
0,
);
}
}
Additional Info:
The installer came with just a few files to handle with Windows,
comparing the the huge files that are in the repository of
druntime:
https://github.com/D-Programming-Language/druntime/tree/master/src/core/sys/windows
So I renamed the old import to Windows2 and copied this whole
github/windows folder there and used its winbase.d because there
are the functions definitions that I needed.
This functions that throw me errors belongs to the advapi32.dll
file. I tried to add pragma(lib "advapi32"); but it didn't work.
I'm new/noob dealing with D and I would appreciate any help.
thanks.
Re: need help with Windows CreateNamedPipe Security attributes process with undefined symbols at compile time
On Tuesday, 1 December 2015 at 04:10:55 UTC, Jonathan Villa wrote:
Hi,
I've been trying to create a NamedPipe with security attributes
but at compile time throws:
Error 42: Symbol Undefined _InitializeSecurityDescriptor@8
Error 42: Symbol Undefined _SetSecurityDescriptorDacl@16
What is causing this: Is this a compile or a linker error?
This is my code, I'm trying to do it using a class:
module asi.pipe;
import core.sys.windows.windows;
import core.sys.windows.winbase;
import core.stdc.stdlib;
class Pipe
{
private HANDLE hPipe;
private SECURITY_ATTRIBUTES sa;
this(string name)
{
CreatePipe(name);
}
private void CreatePipe(string pipename)
{
sa.lpSecurityDescriptor = malloc(SECURITY_DESCRIPTOR.sizeof);
InitializeSecurityDescriptor(cast(PSECURITY_DESCRIPTOR)sa.lpSecurityDescriptor,
1);
is the cast necessary?
SetSecurityDescriptorDacl(cast(PSECURITY_DESCRIPTOR)sa.lpSecurityDescriptor,
TRUE, cast(ACL*)0, FALSE);
sa.nLength = sa.sizeof;
sa.bInheritHandle = TRUE;
CreateNamedPipeA(cast(char*)pipename,
you want toStringz(pipename) or if you know pipename is a null
terminated string pipename.ptr
PIPE_ACCESS_DUPLEX,
(PIPE_TYPE_BYTE |
PIPE_READMODE_BYTE | PIPE_WAIT),
PIPE_UNLIMITED_INSTANCES,
4096,
1536,
0,
);
}
}
Additional Info:
The installer came with just a few files to handle with
Windows, comparing the the huge files that are in the
repository of druntime:
https://github.com/D-Programming-Language/druntime/tree/master/src/core/sys/windows
So I renamed the old import to Windows2 and copied this whole
github/windows folder there and used its winbase.d because
there are the functions definitions that I needed.
This functions that throw me errors belongs to the advapi32.dll
file. I tried to add pragma(lib "advapi32"); but it didn't work.
this needs a comma i.e.
pragma(lib ,"advapi32");
it may also require the appropriate file suffix (.dll or .lib)
I'm new/noob dealing with D and I would appreciate any help.
thanks.
Re: Classes as enums in D?
On Monday, 30 November 2015 at 08:08:20 UTC, Meta wrote: This doesn't quite work in D; you'd have to make each WhiteKey const (which is probably not a bad idea anyway if you're using it like an enum). However, it's better to just do this with plain old value-type structs. It's exactly the same as my previous code defining a WhiteKey class with an embedded enum, but using a struct instead of a class. Thanks for the responses, everyone! Meta's is closest to one of the solutions I was thinking about and I'll probably end up going that way. It's not quite as pretty (as I would need to explicitly add the enum "id" to the struct and switch on that value instead of just the enum variable and I'll need to make sure no ids overlap), but it should work. I take it that not many others would be interested in the syntactic sugar of these like I am? :)
Re: vibe.d-example illustrating Dynamic Textual Web-Interface
Am 30.11.2015 um 11:08 schrieb Nordlöw: Can somebody please show a enlightening example of, so called, "revamp of the REST interface generator" added to release 0.7.26 at: http://vibed.org/blog/posts/vibe-release-0.7.26 I want to use vibe.d to add a modern dynamic web-interface to my knowledge graph I'm currently developing. More specifically I would like an interface that makes rich use of dynamic HTML. When the user changes the contents of a search/command-line text-field the client logic shall on the fly (after a certain delay) lookup related information with vibe.d-server and present the user with relevant hits or completions in a another part of page (HTML div-block). Does anybody have a similar vibe.d-project to be inspired from, in this regard? This would be more targeted to the web interface generator (vibe.web.web), which is not affected by the changes mentioned above, but the interface is pretty similar. For a very simple example, you can have a look at this: https://github.com/rejectedsoftware/vibe.d/tree/master/examples/web_ajax
Re: Classes as enums in D?
On Monday, 30 November 2015 at 07:54:49 UTC, Rikki Cattermole
wrote:
enums don't have to be integral, but for performance reasons it
is for the best.
enum Foo : string {
A = "a",
B = "b",
C = "d",
ERROR = "What are you talking about?"
}
void main() {
import std.stdio : writeln;
Foo foo = Foo.ERROR;
writeln(foo, " is: ", cast(string)foo);
}
Also you are welcome in #d on Freenode (IRC) if you are
interesting in talking with the rest of us!
Btw you probably want tuples (std.typecons : tuple) to emulate
those values.
Oh interesting. So you are saying I could have a struct WhiteKey
{...} and then an enum that extends WhiteKey? You also mention
Tuples, are you recommending the Tuple's type be (WhiteKey, int)?
Thanks!
Re: Classes as enums in D?
On Monday, 30 November 2015 at 07:48:37 UTC, Andrew LaChance
wrote:
Hello,
D has intrigued me for a while, and I thought I would finally
read up on it! I've been reading "Programming in D" by Ali
Çehreli and I've been thinking about how I can use the language
in a side project I'm working on, porting it from java to D.
One of the uncommonly-used features of java that I like is how
enums can be full classes (though I don't like that there's no
option to use enums as e.g. regular ints). This allows several
benefits, such as the ability to use them in switch statements
like regular enums, the full set of objects is known at compile
time, all objects are immutable, it's impossible to
accidentally or purposefully create new objects of that type,
etc...
For example (in java), if I wanted to have an enum that
describes all the white keys on a piano keyboard and have
members that describe the number of half-steps to the next
white key and to the previous white key, I can define an enum
(the "id" or enum value is implicitly defined so it doesn't
have to be explicitly written in the definition):
enum WhiteKey
{
A(2,2),
B(2,1),
C(1,2),
D(2,2),
E(2,1),
F(1,2),
G(2,2);
private final int halfStepsToNext;
private final int halfStepsToPrevious;
WhiteKey(int halfStepsPrevious, int halfStepsNext)
{
this.halfStepsToPrevious = halfStepsPrevious;
this.halfStepsToNext = halfStepsNext;
}
}
From what I've read and seen, in D all enums have forced to
integral types. Is it possible to do the above in D and I have
just missed it? I can think of a few ways around it (such as
statically create and define a bunch of WhiteKey structs, ...),
but none are as clean as the above. If this isn't something
supported, is it on a roadmap of wanted features?
Thanks! I'm looking forward to really getting to know the
language.
Yes and no. You can use arbitrary types for enums in D but a lot
of the time you shouldn't when it involves types that are not
Plain Old Data. A naive translation would be like this:
class WhiteKey
{
private immutable int halfStepsToNext;
private immutable int halfStepsToPrevious;
enum
{
A = new WhiteKey(2, 2),
B = new WhiteKey(2, 1),
C = new WhiteKey(1, 2),
D = new WhiteKey(2, 2),
E = new WhiteKey(2, 1),
F = new WhiteKey(1, 2),
G = new WhiteKey(2, 2),
}
private this(int halfStepsToPrevious, int halfStepsToNext)
{
this.halfStepsToPrevious = halfStepsToPrevious;
this.halfStepsToNext = halfStepsToNext;
}
}
However, you do NOT want to do this, as everywhere you use
WhiteKey's members, a new object will be created. For example:
auto f = WhiteKey.A;
auto n = WhiteKey.A;
import std.stdio;
writeln(, " ", );
This will two different addresses, because a new object is being
created each time. It's basically taking the expression `new
Key(2, 2)` and copy-pasting it wherever you use WhiteKey.A.
Java's enums are basically syntax sugar for this:
class WhiteKey
{
private immutable int halfStepsToNext;
private immutable int halfStepsToPrevious;
public static WhiteKey A = new WhiteKey(2, 2);
public static WhiteKey B = new WhiteKey(2, 1);
public static WhiteKey C = new WhiteKey(1, 2);
public static WhiteKey D = new WhiteKey(2, 2);
public static WhiteKey E = new WhiteKey(2, 1);
public static WhiteKey F = new WhiteKey(1, 2);
public static WhiteKey G = new WhiteKey(2, 2);
private this(int halfStepsToPrevious, int halfStepsToNext)
{
this.halfStepsToPrevious = halfStepsToPrevious;
this.halfStepsToNext = halfStepsToNext;
}
}
This doesn't quite work in D; you'd have to make each WhiteKey
const (which is probably not a bad idea anyway if you're using it
like an enum). However, it's better to just do this with plain
old value-type structs. It's exactly the same as my previous code
defining a WhiteKey class with an embedded enum, but using a
struct instead of a class.
Re: Classes as enums in D?
On Monday, 30 November 2015 at 07:58:43 UTC, Andrew LaChance
wrote:
Oh interesting. So you are saying I could have a struct
WhiteKey {...} and then an enum that extends WhiteKey?
enums can't *extend* anything. You can do this:
struct WhiteKeyS {
immutable int halfStepsToPrevious;
immutable int halfStepsToNext;
}
enum WhiteKey {
A = WhiteKeyS(2, 2),
B = WhiteKeyS(2, 1),
C = WhiteKeyS(1, 2)
}
void main() {
import std.stdio;
writeln(WhiteKey.A.halfStepsToPrevious);
}
Re: Classes as enums in D?
On 30/11/15 8:58 PM, Andrew LaChance wrote:
On Monday, 30 November 2015 at 07:54:49 UTC, Rikki Cattermole wrote:
enums don't have to be integral, but for performance reasons it is for
the best.
enum Foo : string {
A = "a",
B = "b",
C = "d",
ERROR = "What are you talking about?"
}
void main() {
import std.stdio : writeln;
Foo foo = Foo.ERROR;
writeln(foo, " is: ", cast(string)foo);
}
Also you are welcome in #d on Freenode (IRC) if you are interesting in
talking with the rest of us!
Btw you probably want tuples (std.typecons : tuple) to emulate those
values.
Oh interesting. So you are saying I could have a struct WhiteKey {...}
and then an enum that extends WhiteKey? You also mention Tuples, are
you recommending the Tuple's type be (WhiteKey, int)? Thanks!
An enum does not extend other types.
It specifies what the type of the value will be.
It is a little like a map in that way.
I would recommend that the tuple to be the value type of the enum.
You could alias TypeTuple and use it directly and name the fields.
All it is, is a struct.
Re: Constness understanding
Unfortunately in D constant doesn't mean constant :( it means readonly: you can read it, but it can change in other ways. Immutable means constant - doesn't change in any way.
Re: having problem with `std.algorithm.each`
On 30.11.2015 11:50, visitor wrote:
though i don"t understand why it fails silently ??
ref2491's original code is valid, but doesn't have the intended meaning.
`e => {foo(e);}` is the same as `(e) {return () {foo(e);};}`, i.e. a
(unary) function that returns a (nullary) delegate. Calling it does not
run foo. In contrast, calling this runs foo: `e => foo(e)`.
Re: having problem with `std.algorithm.each`
On Monday, 30 November 2015 at 09:56:08 UTC, ref2401 wrote:
DMD 2.069.1
OS Win8.1 Enterprise
in a multiline statement, i believe you must use :
arr.each!((ref e) {
writeln(e);
++e;
})
"=>" is for oneliner
though i don"t understand why it fails silently ??
Re: Constness understanding
On 30.11.2015 13:27, Kagamin wrote: Unfortunately in D constant doesn't mean constant :( it means readonly: you can read it, but it can change in other ways. Immutable means constant - doesn't change in any way. Thanks, considering 'const' as 'readonly' explains my case rather well.
Pixelbuffer to draw on a surface
Hi, is there any possibility, to draw with a pixelbuffer to a surface (for example with GTKD) and to update it every few milliseconds?
Re: Pixelbuffer to draw on a surface
On Monday, 30 November 2015 at 08:37:04 UTC, TheDGuy wrote: Hi, is there any possibility, to draw with a pixelbuffer to a surface (for example with GTKD) and to update it every few milliseconds? Are any of these suitable for your needs? https://github.com/DerelictOrg/DerelictSDL2 http://dgame-dev.de/ https://github.com/DerelictOrg/DerelictSFML2 https://github.com/DerelictOrg/DerelictAllegro5 http://api.gtkd.org/src/gdk/Cairo.html I'm using DerelictSDL2 and Dgame for small 2D hobby games and loving it. Haven't used the others for D pixel rendering but I'm sure they're fine too. bye, lobo
Constness understanding
I have some struct and other struct stores reference to the first one like a pointer to constant. Nevertheless I can change the value of the first struct. Is it some hack? http://dpaste.dzfl.pl/0dfa3dff2df7
Re: DateTime.opBinary
On Sunday, November 29, 2015 23:53:41 Chris Wright via Digitalmars-d-learn wrote: > Unfortunately, ddoc doesn't automatically cross-reference these for you, > which results in confusion. (As if it weren't confusing enough to have > everything wrapped in templates with filters rather than simply using > const(Duration).) Once TickDuration finally goes away, then functions like DateTime's opBinary can be simplified to just take Duration. But until TickDuration and the few things that use it in their API have gone through the deprecation process, we're stuck with it in places like this. - Jonathan M Davis
Re: Classes as enums in D?
On Monday, 30 November 2015 at 10:22:54 UTC, Marc Schütz wrote:
You're misinterpreting this:
enum X {
A = new Object,
B = new Object,
}
void main() {
import std.stdio;
writeln(cast(void*) X.A);
writeln(cast(void*) X.A);
}
# output:
470910
470910
You're print the address of `f` and `n` on the stack, not the
reference they're pointing to.
But it's true that enums of mutable _arrays_ do create a new
instance every time they're used:
enum X {
A = [1,2,3],
B = [4,5,6],
}
void main() {
import std.stdio;
writeln(X.A.ptr);
writeln(X.A.ptr);
}
# output:
7FD887F0E000
7FD887F0E010
Whoops, you're right. I forgot you have to cast to a pointer for
classes.
Re: Pixelbuffer to draw on a surface
On Monday, 30 November 2015 at 09:09:00 UTC, lobo wrote: On Monday, 30 November 2015 at 08:37:04 UTC, TheDGuy wrote: Hi, is there any possibility, to draw with a pixelbuffer to a surface (for example with GTKD) and to update it every few milliseconds? Are any of these suitable for your needs? https://github.com/DerelictOrg/DerelictSDL2 http://dgame-dev.de/ https://github.com/DerelictOrg/DerelictSFML2 https://github.com/DerelictOrg/DerelictAllegro5 http://api.gtkd.org/src/gdk/Cairo.html I'm using DerelictSDL2 and Dgame for small 2D hobby games and loving it. Haven't used the others for D pixel rendering but I'm sure they're fine too. bye, lobo Thanks for your answer, but there is no specific solution inside GTKD?
Re: Pixelbuffer to draw on a surface
but there is no specific solution inside GTKD? for example, in pseudo code auto surf = new Surface(...); // look for cairo.Surface doc auto cr = cairo.Context.Context.create(surf); // pb is an existing gdkpixbuf.Pixbuf gdk.Cairo.setSourcePixbuf(cr, pb, width, height); cr.paint(); adding onDraw event listener on the widget owner of the Pixbuf (gtk.Image for example)
Re: having problem with `std.algorithm.each`
On Monday, 30 November 2015 at 12:03:08 UTC, anonymous wrote:
On 30.11.2015 11:50, visitor wrote:
though i don"t understand why it fails silently ??
ref2491's original code is valid, but doesn't have the intended
meaning. `e => {foo(e);}` is the same as `(e) {return ()
{foo(e);};}`, i.e. a (unary) function that returns a (nullary)
delegate. Calling it does not run foo. In contrast, calling
this runs foo: `e => foo(e)`.
`e => {foo(e);}` is the same as `(e) {return () {foo(e);};}`
Ok, Thanks ! :-)
Re: Pixelbuffer to draw on a surface
On 30.11.2015 16:09, drug wrote: On 30.11.2015 15:49, TheDGuy wrote: On Monday, 30 November 2015 at 09:09:00 UTC, lobo wrote: On Monday, 30 November 2015 at 08:37:04 UTC, TheDGuy wrote: Hi, is there any possibility, to draw with a pixelbuffer to a surface (for example with GTKD) and to update it every few milliseconds? Are any of these suitable for your needs? https://github.com/DerelictOrg/DerelictSDL2 http://dgame-dev.de/ https://github.com/DerelictOrg/DerelictSFML2 https://github.com/DerelictOrg/DerelictAllegro5 http://api.gtkd.org/src/gdk/Cairo.html I'm using DerelictSDL2 and Dgame for small 2D hobby games and loving it. Haven't used the others for D pixel rendering but I'm sure they're fine too. bye, lobo Thanks for your answer, but there is no specific solution inside GTKD? As I know cairo is a part of GTK, so you consider using cairo as a specific solution. *you can consider
Re: Pixelbuffer to draw on a surface
On 30.11.2015 15:49, TheDGuy wrote: On Monday, 30 November 2015 at 09:09:00 UTC, lobo wrote: On Monday, 30 November 2015 at 08:37:04 UTC, TheDGuy wrote: Hi, is there any possibility, to draw with a pixelbuffer to a surface (for example with GTKD) and to update it every few milliseconds? Are any of these suitable for your needs? https://github.com/DerelictOrg/DerelictSDL2 http://dgame-dev.de/ https://github.com/DerelictOrg/DerelictSFML2 https://github.com/DerelictOrg/DerelictAllegro5 http://api.gtkd.org/src/gdk/Cairo.html I'm using DerelictSDL2 and Dgame for small 2D hobby games and loving it. Haven't used the others for D pixel rendering but I'm sure they're fine too. bye, lobo Thanks for your answer, but there is no specific solution inside GTKD? As I know cairo is a part of GTK, so you consider using cairo as a specific solution.
Re: having problem with `std.algorithm.each`
On Monday, 30 November 2015 at 12:03:08 UTC, anonymous wrote:
On 30.11.2015 11:50, visitor wrote:
though i don"t understand why it fails silently ??
ref2491's original code is valid, but doesn't have the intended
meaning. `e => {foo(e);}` is the same as `(e) {return ()
{foo(e);};}`, i.e. a (unary) function that returns a (nullary)
delegate. Calling it does not run foo. In contrast, calling
this runs foo: `e => foo(e)`.
Got it. Thank you)
Re: isAllocator
On Monday, 30 November 2015 at 14:21:49 UTC, Tofu Ninja wrote: Is there something like isInputRange for allocators, I tried looking for something but couldn't find anything? If not, why not? Aka, some way to check that type T is an allocator.
isAllocator
Is there something like isInputRange for allocators, I tried looking for something but couldn't find anything? If not, why not?
Re: switch with enum
On 11/25/15 12:17 AM, tcak wrote:
On Wednesday, 25 November 2015 at 03:59:01 UTC, Steven Schveighoffer wrote:
On 11/24/15 10:51 PM, tcak wrote:
I have seen a code a while ago, but even by looking at documentation, I
couldn't have found anything about it.
Let's say I have defined an enum;
enum Status: ubyte{
Busy = 1,
Active = 2
}
and received a ubyte value from user.
ubyte userValue;
I want to switch over userValue, but that should depend on Status.
switch( userValue ){
}
What I mean is that compiler should enforce values of enum "Status" to
be declared in switch as it would be done with "final switch", but as
you can guess, user might enter a value that is not defined by Status.
Thus, I should be able to enter the case "default" as well.
All final switch does is ensure you are covering all possible enums.
It assumes that the value is already a valid enum value. If you did
final switch on userValue, it would require you handle all 256
possible values for ubyte. So you would have to cast first.
I remember it something like switch( userValue ) with( Status ){...},
but not sure about it. Maybe it was D1 code. Is there anything like this
currently?
What this does (and yes, it should work) is make it so you don't have
to type "Status.Busy" within your case statements. You can just type
"Busy". That's all.
As far as I see, "default" case is not allowed when final switch
is used. From compiler developer's perspective, it is meaningful
and I can understand, but thinking about use cases as I have
given an example, this limitation prevents writing "tight" code.
(That is the term I could have found to express I am trying to say).
I can see what you mean -- you want the compiler to warn that you
haven't covered all the cases, but you don't want to have the
expectation that the program should be in an undefined state if the
default case is executed (currently there *is* a default case in final
switch, which is basically assert(0)).
I think this is a worthy possibility for an enhancement -- if default
case of a final switch is provided, then it should override automatic
"assert(0)" default case.
-Steve
