Re: Interfacing with C++ std::shared_ptr and std::unique_ptr
On Wednesday, 10 June 2020 at 06:43:24 UTC, Andre Pany wrote: Also, the C++ classes make use of templates. Is it still possible to call these classes from D? It should be, I did something similar and it worked. But it was quite some time ago so I don't remember exact situation and any details. However you still be out of luck if the types you are trying to use is present in header only, since there is simply nothing to link with, so now you have to port whole template to D, or make dummy wrapper in C++ that forces the compiler to emit those symbols. Same with ctor/dtors, if you have a class that is only used in some executable and not present in any of a .lib/.a form you're stuck. This is especially annoying with destructors because it renders the whole thing unusable without helper libraries that does new/delete in order to get the damn symbols emitted in object files to be able to link.
Interfacing with C++ std::shared_ptr and std::unique_ptr
Hi,
I would like to interface with the library
https://github.com/NTNU-IHB/FMI4cpp
and have following class definitions in the header file:
``` c++
namespace fmi4cpp {
template
class fmu_base {
public:
const std::string guid() const {
return get_model_description()->guid;
}
const std::string model_name() const {
return get_model_description()->model_name;
}
virtual std::shared_ptr
get_model_description() const = 0;
};
template
class fmu_provider : public virtual
fmu_base {
public:
virtual bool supports_cs() const = 0;
virtual bool supports_me() const = 0;
virtual std::unique_ptr as_cs_fmu() const = 0;
virtual std::unique_ptr as_me_fmu() const = 0;
};
```
While unique_ptr is already available in drunime library
core.stdcpp.memory,
shared_ptr is missing. Does someone already have translated
shared_ptr?
Also, the C++ classes make use of templates. Is it still possible
to call these
classes from D?
Kind regards
Andre
Re: Why is there no range iteration with index by the language?
On Wednesday, 10 June 2020 at 01:35:32 UTC, Q. Schroll wrote: On Wednesday, 10 June 2020 at 00:53:30 UTC, Seb wrote: It's a bit more complicated though as you need to avoid subtle breakage with ranges that return tuples that are auto-expanded like e.g. `foreach (k,v; myDict)`. Okay, I can accept that. It's a poor decision, but well, it is what it is. Anyhow, I would be highly in favor of DMD doing this. It's one of those many things that I have on my list for D3 or a D fork. Is there any "official" or at least public list for D3 suggestions? Many people here talk about it recently... No, there's nothing "official" not public lists yet. However, there are two good related wiki pages: https://wiki.dlang.org/Language_issues https://wiki.dlang.org/Language_design_discussions
Re: Why is there no range iteration with index by the language?
On Wednesday, 10 June 2020 at 00:53:30 UTC, Seb wrote: It's a bit more complicated though as you need to avoid subtle breakage with ranges that return tuples that are auto-expanded like e.g. `foreach (k,v; myDict)`. Okay, I can accept that. It's a poor decision, but well, it is what it is. Anyhow, I would be highly in favor of DMD doing this. It's one of those many things that I have on my list for D3 or a D fork. Is there any "official" or at least public list for D3 suggestions? Many people here talk about it recently...
Re: Alpine support for D
On Wednesday, 10 June 2020 at 01:06:30 UTC, aberba wrote: On Tuesday, 9 June 2020 at 14:23:34 UTC, Jesse Phillips wrote: I notice that in the new release for Alpine Linux it mentions support for D. I was curious what was meant by this and thought someone here would know. Just high level, like druntime was ported or packages added to the repo? Tradionally you'd run D on something like Ubuntu, etc but Alpine is lightweight which is a good thing when building docker containers. Alpine uses a different C runtime musl?? among other things whilst D uses use libc. So I believe we now have bindings musl too to get D to work on Alpine. https://en.m.wikipedia.org/wiki/Musl
Re: Alpine support for D
On Tuesday, 9 June 2020 at 14:23:34 UTC, Jesse Phillips wrote: I notice that in the new release for Alpine Linux it mentions support for D. I was curious what was meant by this and thought someone here would know. Just high level, like druntime was ported or packages added to the repo? Tradionally you'd run D on something like Ubuntu, etc but Alpine is lightweight which is a good thing when building docker containers. Alpine uses a different C runtime musl?? among other things whilst D uses use libc. So I believe we now have bindings musl too to get D to work on Alpine.
Re: 32 bit phobos
On Tuesday, 9 June 2020 at 17:58:56 UTC, welkam wrote: I tried to compile a 32 bit executable but my system does not have 32 bit phobos. How do I get 32 bit phobos? I am using Manjaro. dmd -m32 source/test2.d /usr/bin/ld: skipping incompatible /usr/lib/gcc/x86_64-pc-linux-gnu/10.1.0/../../../libphobos2.a when searching for -lphobos2 /usr/bin/ld: skipping incompatible /usr/lib/libphobos2.a when searching for -lphobos2 /usr/bin/ld: cannot find -lphobos2 collect2: error: ld returned 1 exit status Error: linker exited with status 1 Download a DMD archive (.tar.xz) from https://dlang.org/download.html or use the official install script. DMD archives contain both 32 and 64-bit binaries.
Re: Why is there no range iteration with index by the language?
On Tuesday, 9 June 2020 at 23:53:16 UTC, Q. Schroll wrote:
Is there any particular reason why std.range : enumerate is a
thing and
foreach (i, e; range) { ... }
doesn't work from the get-go? I wouldn't have such an issue
with it if static foreach would work with enumerate just fine.
As far as I can tell,
foreach (e; range) { ... }
is being lowered to
for (auto _range = range; !_range.empty; _range.popFront)
{
auto e = _range.front;
...
}
So why cant DMD rewrite
foreach (i, e; range) { ... }
to
for (auto _range = range, index = size_t(0); !_range.empty;
_range.popFront, ++index)
{
size_t i = index;
auto e = _range.front;
...
}
Doesn't seem like a big deal, does it? I'm asking because I
suspect there's an odd reason I have no idea and I whish to be
educated.
It's a bit more complicated though as you need to avoid subtle
breakage with ranges that return tuples that are auto-expanded
like e.g. `foreach (k,v; myDict)`.
So IIRC the main reason why D's foreach magic isn't doing this is
that it was argued that this problem is not significant enough to
be worth fixing as there's enumerate and "there's bigger fish to
fry".
Anyhow, I would be highly in favor of DMD doing this. It's one of
those many things that I have on my list for D3 or a D fork.
Re: Why is there no range iteration with index by the language?
On Tuesday, 9 June 2020 at 23:53:16 UTC, Q. Schroll wrote: Is there any particular reason why std.range : enumerate is a thing and [...] I don't think there is any particular reason. Other than that might shadow an opApply. And C++ iterators didn't have it.
Re: Why is there no range iteration with index by the language?
On Tue, Jun 09, 2020 at 05:03:55PM -0700, H. S. Teoh via Digitalmars-d-learn
wrote:
> On Tue, Jun 09, 2020 at 11:53:16PM +, Q. Schroll via Digitalmars-d-learn
> wrote:
> > Is there any particular reason why std.range : enumerate is a thing
> > and
> >
> > foreach (i, e; range) { ... }
> >
> > doesn't work from the get-go?
> [...]
>
> std.range.indexed is your friend. ;-)
[...]
Aaah, that function doesn't do what I thought it did. Sorry!! :-(
What you want is std.range.enumerate. But you already knew that.
T
--
EMACS = Extremely Massive And Cumbersome System
Re: Why is there no range iteration with index by the language?
On Tue, Jun 09, 2020 at 11:53:16PM +, Q. Schroll via Digitalmars-d-learn
wrote:
> Is there any particular reason why std.range : enumerate is a thing
> and
>
> foreach (i, e; range) { ... }
>
> doesn't work from the get-go?
[...]
std.range.indexed is your friend. ;-)
T
--
Let's eat some disquits while we format the biskettes.
Why is there no range iteration with index by the language?
Is there any particular reason why std.range : enumerate is a
thing and
foreach (i, e; range) { ... }
doesn't work from the get-go? I wouldn't have such an issue with
it if static foreach would work with enumerate just fine. As far
as I can tell,
foreach (e; range) { ... }
is being lowered to
for (auto _range = range; !_range.empty; _range.popFront)
{
auto e = _range.front;
...
}
So why cant DMD rewrite
foreach (i, e; range) { ... }
to
for (auto _range = range, index = size_t(0); !_range.empty;
_range.popFront, ++index)
{
size_t i = index;
auto e = _range.front;
...
}
Doesn't seem like a big deal, does it? I'm asking because I
suspect there's an odd reason I have no idea and I whish to be
educated.
Re: Metaprogramming with D
On Monday, 8 June 2020 at 14:41:55 UTC, Jan Hönig wrote:
On Sunday, 7 June 2020 at 00:45:37 UTC, Ali Çehreli wrote:
dmd -mixin= ...
thanks for the tip!
writeln(q{
void foo() {
}
});
What is the name of this `q` thing?
How do i find it? Are there any recent tutorials on it?
Ali's online book consolidates a lot of D language knowledge like
this. I forgot about token string literals myself but then
remembered it was in his book.
Re: Metaprogramming with D
On 09.06.20 20:16, Ali Çehreli wrote:
I am biased but I like my :) index of the book, where all such syntax
items appear:
https://ddili.org/ders/d.en/ix.html
Oh yeah. It's how I got the link. You might want to fix some of the
URLs, though. Characters like '{' or '[' need to be percent-encoded.
Re: Metaprogramming with D
On 6/8/20 7:50 AM, ag0aep6g wrote: https://ddili.org/ders/d.en/literals.html#ix_literals.q%7B%7D Thank you. I am biased but I like my :) index of the book, where all such syntax items appear: https://ddili.org/ders/d.en/ix.html Ali
Re: filter custom version id from __traits code
On Tuesday, 9 June 2020 at 18:08:01 UTC, Stanislav Blinov wrote: On Tuesday, 9 June 2020 at 17:40:10 UTC, Basile B. wrote: Any idea ? As I replied in the issue report: Instead of static if (!is(mixin(member) == module) && !(is(mixin(member use static if (is(typeof(mixin(member Yes thanks again for the help.
Re: filter custom version id from __traits code
On Tuesday, 9 June 2020 at 17:40:10 UTC, Basile B. wrote: Any idea ? As I replied in the issue report: Instead of static if (!is(mixin(member) == module) && !(is(mixin(member use static if (is(typeof(mixin(member
32 bit phobos
I tried to compile a 32 bit executable but my system does not have 32 bit phobos. How do I get 32 bit phobos? I am using Manjaro. dmd -m32 source/test2.d /usr/bin/ld: skipping incompatible /usr/lib/gcc/x86_64-pc-linux-gnu/10.1.0/../../../libphobos2.a when searching for -lphobos2 /usr/bin/ld: skipping incompatible /usr/lib/libphobos2.a when searching for -lphobos2 /usr/bin/ld: cannot find -lphobos2 collect2: error: ld returned 1 exit status Error: linker exited with status 1
filter custom version id from __traits code
I don't see how to filter a custom version identifier from this
traits code:
---
module test;
import std.traits : isCallable;
version(all) version = my_version;
private bool onlyFuncs()
{
bool result = true;
foreach (member; __traits(allMembers, mixin(__MODULE__)))
{
static if (!is(mixin(member) == module) &&
!(is(mixin(member
static if (__traits(getOverloads, mixin(__MODULE__),
member, true).length == 0)
{
pragma(msg, "`", member, "` ", "is not a type or a
function");
result = false;
break;
}
}
return result;
}
static assert(onlyFuncs(), "this script must hide globals as
local static variable in a getter");
void main(){}
---
: Error: undefined identifier my_version in module test
onlineapp.d(12): Error: module test.my_version cannot be
resolved
onlineapp.d(21):called from here: onlyFuncs()
onlineapp.d(21):while evaluating: static
Any idea ?
Re: Alpine support for D
On Tuesday, 9 June 2020 at 14:23:34 UTC, Jesse Phillips wrote: I notice that in the new release for Alpine Linux it mentions support for D. Announcement: https://forum.dlang.org/thread/raue6j$1vp4$2...@digitalmars.com
Alpine support for D
I notice that in the new release for Alpine Linux it mentions support for D. I was curious what was meant by this and thought someone here would know. Just high level, like druntime was ported or packages added to the repo?
