Re: Function parameters UDAs
On Wednesday, 14 November 2018 at 18:05:55 UTC, Adam D. Ruppe
wrote:
On Wednesday, 14 November 2018 at 16:28:19 UTC, Radu wrote:
Looks like that there is no easy way to extract a function
parameters UDA list.
Indeed, the only way I can find is kinda crazy:
---
void foo(int f, @("test") string s) {}
void main() {
static if(is(typeof(foo) Params == __parameters))
pragma(msg, __traits(getAttributes,
Params[1..2])); // get the second param
}
---
So, the process is:
1) alias the params with the static if + is() statement (this
is what std.traits.Parameters does internally)
2) slice the params! using params[0] will not work, but
params[0 .. 1] will.
3) get the attributes using the language function
Yes, that does the trick, thanks!
Re: Windows Service
On Thursday, 15 November 2018 at 04:45:26 UTC, Soulsbane wrote: On Wednesday, 14 November 2018 at 19:38:08 UTC, Thomas wrote: Hi, I want to run a D program as a Windows service. After googl'in, I only found a very old project on github: https://github.com/tylerjensen/WindowsServiceInD Unfortunately, I wasn't able to compile it successfully. Does anybody know of newer approaches or even a template to start from? Thanks in advance, Thomas There is https://code.dlang.org/packages/daemonize I've only played with it a little on the Linux side so I'm not sure how good the windows service implementation is. I have just successfully compiled and started the hello-world example. It works (after fixing a small error) in Windows as well. Thanks a lot!
Vibe throw link error
Vibe.d 0.8.4 throw link error with dmd-2.08.0 and newer on windows 10. What is the what out. In dub package register, it was said that vibe 0.8.4 works with dmd 2.08.0 and old version but in my case it does not work looking forward for help
Re: Windows Service
On Wednesday, 14 November 2018 at 19:38:08 UTC, Thomas wrote: Hi, I want to run a D program as a Windows service. After googl'in, I only found a very old project on github: https://github.com/tylerjensen/WindowsServiceInD Unfortunately, I wasn't able to compile it successfully. Does anybody know of newer approaches or even a template to start from? Thanks in advance, Thomas There is https://code.dlang.org/packages/daemonize I've only played with it a little on the Linux side so I'm not sure how good the windows service implementation is.
Re: Could not setup D extension on vs code
On Wednesday, 14 November 2018 at 19:28:44 UTC, WebFreak001 wrote: On Wednesday, 14 November 2018 at 13:20:31 UTC, greatsam4sure wrote: [...] Hi, thanks for the report, I tagged a new version of workspace-d which will fix this issue. Simply reload vscode and let it rebuild to fix. Issue was: for a long time dfmt didn't get a new tagged release and wasn't compatible with the dscanner and libdparse version I used anymore, so I changed it to use ~master instead. Since a few days it has been tagged and it was added to workspace-d ~master but serve-d still uses the latest tagged release. So as dfmt now got updated to an even newer libdparse, the other components don't match that libdparse version anymore and now dfmt is too new for it... It's a real pain that you can't select specific commits in dub, but I try to keep up with the updates and make them work somehow. Sometimes it feels like unnecessary major (minor) version bumps that just break all the version compatibility with barely any backwards incompatibility in the code. thanks,fix after reloading vs code several times with internet connection. DCD was not downloaded i have to manually download it, extract it and copy dcd-client.exe and dcd-server.exe to code-d\bin and set up the path in vs code for auto completion to work
Re: Could not setup D extension on vs code
On Wednesday, 14 November 2018 at 20:44:26 UTC, Neia Neutuladh wrote: On Wed, 14 Nov 2018 19:28:44 +, WebFreak001 wrote: It's a real pain that you can't select specific commits in dub, but I try to keep up with the updates and make them work somehow. Yeah, I've used submodules and path-based dependencies once or twice because of that. It's not the best. that would be the best solution if you don't publish your package to the dub registry. If you do publish it you have all the problems with it not cloning your repo recursively.
Re: Could not setup D extension on vs code
On Wed, 14 Nov 2018 19:28:44 +, WebFreak001 wrote: > It's a real pain that you can't select specific commits in dub, but I > try to keep up with the updates and make them work somehow. Yeah, I've used submodules and path-based dependencies once or twice because of that. It's not the best.
Windows Service
Hi, I want to run a D program as a Windows service. After googl'in, I only found a very old project on github: https://github.com/tylerjensen/WindowsServiceInD Unfortunately, I wasn't able to compile it successfully. Does anybody know of newer approaches or even a template to start from? Thanks in advance, Thomas
Re: Could not setup D extension on vs code
On Wednesday, 14 November 2018 at 13:20:31 UTC, greatsam4sure wrote: What is the solution to this: Unresolvable dependencies to package libdparse: dfmt ~master depends on libdparse ~>0.10.7 libddoc 0.4.0 depends on libdparse ~>0.9.0 Failed to install serve-d (Error code 2) Where can i download libdparse 0.10.7 The full error file below. i am on windows 10 Installing into C:\Users\Greatsam\AppData\Roaming\code-d\bin Removing old version Removed old version git clone --recursive https://github.com/Pure-D/serve-d.git serve-d Cloning into 'serve-d'... dub upgrade Upgrading project in C:\Users\Greatsam\AppData\Roaming\code-d\bin\serve-d Unresolvable dependencies to package libdparse: dfmt ~master depends on libdparse ~>0.10.7 libddoc 0.4.0 depends on libdparse ~>0.9.0 Failed to install serve-d (Error code 2) Hi, thanks for the report, I tagged a new version of workspace-d which will fix this issue. Simply reload vscode and let it rebuild to fix. Issue was: for a long time dfmt didn't get a new tagged release and wasn't compatible with the dscanner and libdparse version I used anymore, so I changed it to use ~master instead. Since a few days it has been tagged and it was added to workspace-d ~master but serve-d still uses the latest tagged release. So as dfmt now got updated to an even newer libdparse, the other components don't match that libdparse version anymore and now dfmt is too new for it... It's a real pain that you can't select specific commits in dub, but I try to keep up with the updates and make them work somehow. Sometimes it feels like unnecessary major (minor) version bumps that just break all the version compatibility with barely any backwards incompatibility in the code.
Re: Function parameters UDAs
On Wednesday, 14 November 2018 at 16:28:19 UTC, Radu wrote:
Looks like that there is no easy way to extract a function
parameters UDA list.
Indeed, the only way I can find is kinda crazy:
---
void foo(int f, @("test") string s) {}
void main() {
static if(is(typeof(foo) Params == __parameters))
pragma(msg, __traits(getAttributes,
Params[1..2])); // get the second param
}
---
So, the process is:
1) alias the params with the static if + is() statement (this is
what std.traits.Parameters does internally)
2) slice the params! using params[0] will not work, but params[0
.. 1] will.
3) get the attributes using the language function
Re: passing subclass to superclass where parameter is a delegate for the superclass
On Wednesday, 14 November 2018 at 16:39:52 UTC, Alex wrote:
Are you looking for this?
https://dlang.org/phobos/std_traits.html#TransitiveBaseTypeTuple
It matches however not exactly your needs:
As all objects are derived from the Object class, you will
always get it as the common parent. So... with the trait, you
get a list but have still to make a decision which type to use.
Maybe, something like this:
´´´
import std.traits;
template properBase(T)
{
static foreach(i, t; TransitiveBaseTypeTuple!A)
{
static if(hasMember!(t, "add_function")){}
else
{
static if(!__traits(compiles, {auto c =
properBase.init;}))
{
alias properBase =
TransitiveBaseTypeTuple!A[i-1];
}
}
}
}
void main(){}
class base
{
void delegate(typeof(this)) stored_dg;
this(){}
void
add_function (void delegate (typeof(this)) dlg)
{
stored_dg = dlg;
}
}
class A : base
{
alias pB = properBase!A;
this ()
{
super ();
add_function (&this.foo);
}
void foo (pB a)
{
import std.experimental.logger;
log ("i got here");
}
}
´´´
Re: passing subclass to superclass where parameter is a delegate for the superclass
On Wednesday, 14 November 2018 at 16:06:21 UTC, Chris Bare wrote:
If I have:
class base
{
void delegate(base) stored_dg;
void
add_function (void delegate (base) dlg)
{
stored_dg = dlg;
}
}
class A : base
{
this ()
{
super ();
add_function (&this.foo);
}
void foo (A a)
{
log ("i got here");
}
}
it fails because foo(A) does not match the parameter type of
delegate(base)
If I change foo (A a) to foo (base a)
It works, but this could be awkward in a deeper class hierarchy
where you
might not know the class name to use.
Is there a way to do this where foo's parameter type does not
to match the
class that implements add_function?
Thanks,
Chris
Are you looking for this?
https://dlang.org/phobos/std_traits.html#TransitiveBaseTypeTuple
It matches however not exactly your needs:
As all objects are derived from the Object class, you will always
get it as the common parent. So... with the trait, you get a list
but have still to make a decision which type to use.
Function parameters UDAs
Looks like that there is no easy way to extract a function
parameters UDA list.
The following:
```
import std.traits;
struct s { string foo; }
void foo(@s("aaa") int a, bool x);
void main()
{
alias P = Parameters!foo;
enum udas = __traits(getAttributes, P);
pragma(msg, udas);
}
```
will print `tuple(s("aaa"))`
but if you change `foo` to `void foo(int a, @s("aaa") bool x);`
you get `Error: first argument is not a symbol`
Is this a current limitation or I'm using the wrong approach?
passing subclass to superclass where parameter is a delegate for the superclass
If I have:
class base
{
void delegate(base) stored_dg;
void
add_function (void delegate (base) dlg)
{
stored_dg = dlg;
}
}
class A : base
{
this ()
{
super ();
add_function (&this.foo);
}
void foo (A a)
{
log ("i got here");
}
}
it fails because foo(A) does not match the parameter type of
delegate(base)
If I change foo (A a) to foo (base a)
It works, but this could be awkward in a deeper class hierarchy
where you
might not know the class name to use.
Is there a way to do this where foo's parameter type does not to
match the
class that implements add_function?
Thanks,
Chris
Could not setup D extension on vs code
What is the solution to this: Unresolvable dependencies to package libdparse: dfmt ~master depends on libdparse ~>0.10.7 libddoc 0.4.0 depends on libdparse ~>0.9.0 Failed to install serve-d (Error code 2) Where can i download libdparse 0.10.7 The full error file below. i am on windows 10 Installing into C:\Users\Greatsam\AppData\Roaming\code-d\bin Removing old version Removed old version git clone --recursive https://github.com/Pure-D/serve-d.git serve-d Cloning into 'serve-d'... dub upgrade Upgrading project in C:\Users\Greatsam\AppData\Roaming\code-d\bin\serve-d Unresolvable dependencies to package libdparse: dfmt ~master depends on libdparse ~>0.10.7 libddoc 0.4.0 depends on libdparse ~>0.9.0 Failed to install serve-d (Error code 2)
Re: Differences between group() and chunkBy()
On Wednesday, 14 November 2018 at 12:28:38 UTC, Per Nordlöw wrote: Is it because of `group` has a default for the predicate whereas `chunkBy` hasn't. chunkBy splits the range into smaller ranges, group actually returns tuples of the item and the amount of occurences. Because in group the condition is fixed to equality, it's redundant to return a range of [2, 2, 2, 2, 2, 2] for example when you can simply return a tuple (2, 6). The example: group([5, 2, 2, 3, 3]) returns a range containing the tuples tuple(5, 1), tuple(2, 2), and tuple(3, 2). Is a bit confusing since tuple(2, 2) looks like it could be a range of two 2's as well.
Differences between group() and chunkBy()
Why is there at https://dlang.org/phobos/std_algorithm_iteration.html an inconsistency in naming of `group` and chunkBy`? Is it because of `group` has a default for the predicate whereas `chunkBy` hasn't. Further, why aren't the two merged into a single iteration algorithm?
Re: Problem with opBinary
Thanks, this make it clear. (This also explains the existence of opBinaryRight)
Re: Problem with opBinary
On Wednesday, November 14, 2018 2:54:27 AM MST realhet via Digitalmars-d-
learn wrote:
> Hi,
>
> Just a little weird thing I noticed and don't know why it is:
>
> I have a FilePath struct and I wanted to make it work with the
> "~" operator and an additional string.
>
> So I've created a global funct:
>
>FilePath opBinary(string op:"~")(FilePath p1, string p2){
> return FilePath(p1, p2);
>}
>
> The problem is that this funct is only callable with the
> following code:
>
>auto vlcPath = programFilesPath.opBinary!"~"(`VideoLAN\VLC`);
>
> And it is not callable using the ~ operator directly. It says
> unable to call with types FilePath and string
>
> When I rewrite the opBinary funct as a member of the FilePath
> struct, everything is working fine. The problem is only happening
> when opBinary is a global funct. (I'm using LDC Win64)
>
> Is it a bug or is there an explanation to this?
In D, all overloaded operators must be member functions.
- Jonathan M Davis
Problem with opBinary
Hi,
Just a little weird thing I noticed and don't know why it is:
I have a FilePath struct and I wanted to make it work with the
"~" operator and an additional string.
So I've created a global funct:
FilePath opBinary(string op:"~")(FilePath p1, string p2){
return FilePath(p1, p2);
}
The problem is that this funct is only callable with the
following code:
auto vlcPath = programFilesPath.opBinary!"~"(`VideoLAN\VLC`);
And it is not callable using the ~ operator directly. It says
unable to call with types FilePath and string
When I rewrite the opBinary funct as a member of the FilePath
struct, everything is working fine. The problem is only happening
when opBinary is a global funct. (I'm using LDC Win64)
Is it a bug or is there an explanation to this?
Re: Is there any way for non-blocking IO with phobos?
On Tuesday, 13 November 2018 at 13:52:57 UTC, Sobaya wrote: But I don't know how many lines are sent from the server for an input, so readln function blocks. Read lines in another thread and send them to the main thread with std.concurrency.
