Re: Is build a 64 bit version worth if I'm looking for better perfomance?
On Tuesday, May 01, 2018 22:48:08 Dr.No via Digitalmars-d-learn wrote: > Looking for make application run fast as possible, aside > optimization in the source code, is using 64 bit over 32 really > worth? That would heavily depend on the program. The big win for D code and 64-bit that doesn't necessarily apply to other languages would be that the GC won't end up with false pointers like it does with 32-bit code (i.e. because the address space is small enough, when scanning, it can easily think that a 32-bit integer value is a pointer and thus not free that memory, because it thinks that you have a pointer to it; the 64-bit address space is large enough that that doesn't happen enough to really matter). But aside from that, as I understand it, it's not an obvious gain one way or the other and is really going to depend on what you're doing. In general, it's better to match the architecture of the machine, which would almost certainly mean 64-bit at this point, but modern x86_64 machines are highly optimized for 32-bit code as well, and 64-bit programs tend to use more memory, because stuff like pointers are twice as large (the program won't use double the memory, because it's not like everything that gets pointed to doubles in size - just the pointers and other types whose size depends on the size of pointers - but you'll use more memory, which can slow things down). So, some stuff will be faster with 32-bit and other stuff will be faster with 64-bit. In general, at this point, talking about whether you should be writing 32-bit or 64-bit programs is kind of silly outside of Windows. Everywhere else, you just target what the OS is running, which is probably 64-bit, and with Windows, whether 32-bit or 64-bit is better probably has more to do with what you're trying to do with your program than anything (e.g. whether you have to worry about supporting folks with 32-bit Windows installs). D in general is designed to be architecture-independent. It doesn't always succeed at that, but most D code is going to work just fine as both 32-bit and 64-bit (especially if auto and size_t are used properly). And it's generally bad practice to target one or the other. As such, you can just write your program and then see how it performs as 32-bit and how it performs as 64-bit. If performance is then your biggest concern for choosing 32-bit or 64-bit, then you can just go with whichever performs better. Either way, I would strongly discourage you from making it so that your program only works as 32-bit or only works as 64-bit - not unless it's doing something that requires enough memory that it has to be 64-bit, and most programs don't need that. - Jonathan M Davis
Re: Can I convert the Range returned by asUpperCase to ubyte[]?
On Tuesday, May 01, 2018 20:13:41 Dr.No via Digitalmars-d-learn wrote: > I'm trying to do an optimization here: a hash function which > expect a ubye[] array as argument, would just work if I cast > string to ubyte[] but I need to convert it to upper case, so I'd > like to do that lazily, so that the byte is converted to its > upper case version soon as it's requested. I'm not sure if this > possible because I think the function should also work with Range > and not ubyte[] to work. > > So, adding some code example, can I convert the string to upper > case then convert it to ubyte[] without memory allocation? > something like this: > > > import xxhash; > import std.uni : asUpperCase; > uint hash = xxhashOf(cast(ubyte[])(word.asUpperCase)); If you want a ubyte[], then you'd need to convert the range to char[] so string and then do something like call representation on it to get an array of ubytes. But at that point, using asUpperCase instead of toUpper is pointless. Pretty much the only way that you could avoid allocating to get a ubyte[] would be if you did something like have a static array that you filled and then sliced, which requires knowing ahead of time how much space you need (or at least knowing the upper bound). At that point, you could use asUpperCase and then put each character into the static array, and then slice the static array. But that's a royal pain in comparison to just allocating a dynamic array. You'd do better to make it so that your hashing code operates on a range rather than requiring an array of ubytes. Then you wouldn't need to allocate or array or jump through a bunch of hoops to get a dynamic array that's a slice of a static array or something similar. - Jonathan M Davis
Re: How to curl!
On Wednesday, 2 May 2018 at 00:04:49 UTC, IntegratedDimensions wrote: On Tuesday, 1 May 2018 at 23:35:42 UTC, Arun Chandrasekaran wrote: On Tuesday, 1 May 2018 at 21:57:22 UTC, IntegratedDimensions wrote: [...] std.net.curl is not quite up to date when compared to the curl command. It is not useful any non-trivial stuff. Right now I'm using ikod's dlang-requests[1] and I'm quite happy with it. I would recommend you to try it. [1] https://github.com/ikod/dlang-requests Ok, first try: Unhandled exception: object.Exception can't complete call to TLS_method at requests\ssl_adapter.d(248) which says it can't find the lib. I renamed ssleay32.dll to libssl32.dll and it then passed. I am getting http 404 error though ;/ I turned off cert though, which may be the reason, I have no idea. Seems to be working through. Did you try to use full path to cacert.pem?
Re: D in SUSE Enterprise Linux
On Tuesday, 1 May 2018 at 16:02:03 UTC, rikki cattermole wrote: On 02/05/2018 3:51 AM, Vino wrote: On Tuesday, 1 May 2018 at 15:42:38 UTC, Jonathan M Davis wrote: On Tuesday, May 01, 2018 15:18:12 Vino via Digitalmars-d-learn wrote: [...] That sounds like your /tmp is mounted with noexec. which won't work with rdmd or any other program that expects to be able to create a file in /tmp and run it. Presumably, you'll need to change the settings in /etc/fstab so that /tmp is not mounted with noexec. - Jonathan M Davis Hi Jonathan, Yes the /tmp is mounted with noexec option , we should not change this option as it is a security violation so is there any other way we can make it work, it tried setting the tmp env variable to a local FS which is mounted with the noexec option but it did not work. From, Vino.B Modify rdmd to use another directory which is more acceptable for your setup. Or just set an environment variable like TMP, if you don't want to append the flag Jonathan gave each time, as rdmd simply calls std.file.tempDir: https://dlang.org/phobos/std_file.html#.tempDir
Re: Can I convert the Range returned by asUpperCase to ubyte[]?
On 05/01/2018 10:13 PM, Dr.No wrote: I'm trying to do an optimization here: a hash function which expect a ubye[] array as argument, would just work if I cast string to ubyte[] but I need to convert it to upper case, so I'd like to do that lazily, so that the byte is converted to its upper case version soon as it's requested. I'm not sure if this possible because I think the function should also work with Range and not ubyte[] to work. Yup. Not possible. There's no such thing as a lazy ubyte[].
Re: How to curl!
On Tuesday, 1 May 2018 at 23:35:42 UTC, Arun Chandrasekaran wrote: On Tuesday, 1 May 2018 at 21:57:22 UTC, IntegratedDimensions wrote: Trying to curl basic stuff but std.net.curl isn't cooperating: This is one of the reasons I hate D ;/ I've spent more time trying to get std.net.curl to do something that just works from the command line. std.net.curl is not quite up to date when compared to the curl command. It is not useful any non-trivial stuff. Right now I'm using ikod's dlang-requests[1] and I'm quite happy with it. I would recommend you to try it. [1] https://github.com/ikod/dlang-requests Ok, first try: Unhandled exception: object.Exception can't complete call to TLS_method at requests\ssl_adapter.d(248) which says it can't find the lib. I renamed ssleay32.dll to libssl32.dll and it then passed. I am getting http 404 error though ;/ I turned off cert though, which may be the reason, I have no idea. Seems to be working through.
Re: How to curl!
On Tuesday, 1 May 2018 at 23:02:39 UTC, Dr.No wrote: On Tuesday, 1 May 2018 at 22:51:01 UTC, IntegratedDimensions wrote: [...] those dlls: libeay32.dll libssl32.dll ssleay32.dll I'm sure they would be installed with whatever [...] I don't think so. IIRC, when I used D+curl I needed to download them manutally. This is always the case with Qt. Even using windeployqt with --webkit2 flag I still need to copy those dlls to application binary folder. [...] It isn't always the case if the dll is dynamic loaded, it might fail quietly, for example, if you deploy an Qt application with QWebKit missing those Open SSL dlls, an page with https protocol just doesn't open and didn't show any error at all. To find out whether some referenced dll by your executable is missing, people use Dependence Walker: http://www.dependencywalker.com/ I don't think this is the problem. If I use get on https://www.google.com it works fine but if I use get on https://www.googleapis.com/youtube/v3/channels it fails so it is site dependent.
Re: How to curl!
On Tuesday, 1 May 2018 at 21:57:22 UTC, IntegratedDimensions wrote: Trying to curl basic stuff but std.net.curl isn't cooperating: This is one of the reasons I hate D ;/ I've spent more time trying to get std.net.curl to do something that just works from the command line. std.net.curl is not quite up to date when compared to the curl command. It is not useful any non-trivial stuff. Right now I'm using ikod's dlang-requests[1] and I'm quite happy with it. I would recommend you to try it. [1] https://github.com/ikod/dlang-requests
Re: Is build a 64 bit version worth if I'm looking for better perfomance?
On Tuesday, 1 May 2018 at 22:48:08 UTC, Dr.No wrote: Looking for make application run fast as possible, aside optimization in the source code, is using 64 bit over 32 really worth? With the GC yes, since false pointers become less of an issue. Also you get to take full advantage of the target CPU. The vast majority of home computers today use 64 bit. You'll also be able to take advantage of more optimizations since the compiler can assume more features are available. But you will *probably* get better performance from profiling + optimizing than 32 bit -> 64 bit.
Re: How to curl!
On Tuesday, 1 May 2018 at 22:51:01 UTC, IntegratedDimensions wrote: On Tuesday, 1 May 2018 at 22:08:50 UTC, Dr.No wrote: On Tuesday, 1 May 2018 at 21:57:22 UTC, IntegratedDimensions wrote: Trying to curl basic stuff but std.net.curl isn't cooperating: curl "https://www.googleapis.com/youtube/v3/channels"; -G -d part=contentDetails -d forUsername=test -d key=somekey [...] Just a wild guess, do you have the SSL dlls in the same folder as your executable or (less likely) in your PATH? What SSL dlls? those dlls: libeay32.dll libssl32.dll ssleay32.dll I'm sure they would be installed with whatever installation uses them. I don't think so. IIRC, when I used D+curl I needed to download them manutally. This is always the case with Qt. Even using windeployqt with --webkit2 flag I still need to copy those dlls to application binary folder. ssleay32.dll comes with dmd2 and it is in the path, if that is what you are talking about. If a dll was missing though and that was the problem then it needs to state that it is a missing dll rather than some other issue. It isn't always the case if the dll is dynamic loaded, it might fail quietly, for example, if you deploy an Qt application with QWebKit missing those Open SSL dlls, an page with https protocol just doesn't open and didn't show any error at all. To find out whether some referenced dll by your executable is missing, people use Dependence Walker: http://www.dependencywalker.com/
Re: How to curl!
On Tuesday, 1 May 2018 at 22:08:50 UTC, Dr.No wrote: On Tuesday, 1 May 2018 at 21:57:22 UTC, IntegratedDimensions wrote: Trying to curl basic stuff but std.net.curl isn't cooperating: curl "https://www.googleapis.com/youtube/v3/channels"; -G -d part=contentDetails -d forUsername=test -d key=somekey [...] Just a wild guess, do you have the SSL dlls in the same folder as your executable or (less likely) in your PATH? What SSL dlls? I'm sure they would be installed with whatever installation uses them. ssleay32.dll comes with dmd2 and it is in the path, if that is what you are talking about. If a dll was missing though and that was the problem then it needs to state that it is a missing dll rather than some other issue.
Is build a 64 bit version worth if I'm looking for better perfomance?
Looking for make application run fast as possible, aside optimization in the source code, is using 64 bit over 32 really worth?
Re: How to curl!
On Tuesday, 1 May 2018 at 21:57:22 UTC, IntegratedDimensions wrote: Trying to curl basic stuff but std.net.curl isn't cooperating: curl "https://www.googleapis.com/youtube/v3/channels"; -G -d part=contentDetails -d forUsername=test -d key=somekey [...] Just a wild guess, do you have the SSL dlls in the same folder as your executable or (less likely) in your PATH?
How to curl!
Trying to curl basic stuff but std.net.curl isn't cooperating:
curl "https://www.googleapis.com/youtube/v3/channels"; -G -d
part=contentDetails -d forUsername=test -d key=somekey
import std.stdio;
import std.net.curl;
int main(string[] argv)
{
auto http = HTTP();
http.caInfo("cacert.pem"); // cacert.pem installed in the bin dir
http.handle.set(CurlOption.ssl_verifypeer, 1);
auto content =
post("https://www.googleapis.com/youtube/v3/channels";, ["part" :
"contentDetails", "forUsername" : "test", "key" : "somekey"],
http);
return 0;
}
I either get the error
Unhandled exception: std.net.curl.CurlException Peer certificate
cannot be authenticated with given CA certificates on handle at
std\net\curl.d(4343)
or, when verifypeer is 0,
Unhandled exception: std.net.curl.HTTPStatusException HTTP
request returned status code 404 (Not Found)
But the command line version works fine. (of course, if you want
to test you must use a valid key and youtube user name.
This is one of the reasons I hate D ;/ I've spent more time
trying to get std.net.curl to do something that just works from
the command line.
Pure double to string conversion
Is there a way to convert a `double` to a `string` in a `pure`
function?
I tried
@safe pure unittest
{
import std.conv : to;
const y = 3.14.to!string;
}
but it fails to compile as
`pure` function `foo.__unittest_L1_C12` cannot call impure
function `std.conv.to!string.to!double.to`
Have anybody wrapped the corresponding C solution via, snprintf
or gcvt in a high-level D wrapper?
Is assume `gcvt` is GNU only but that's ok with me. I assume
`gcvt` is faster than `snprintf` in this case.
Re: Purity of delegate-style toString
On Tuesday, 1 May 2018 at 12:03:15 UTC, ag0aep6g wrote: By the way, you shouldn't mark toString as @trusted when `sink` is @system. Thanks
Can I convert the Range returned by asUpperCase to ubyte[]?
I'm trying to do an optimization here: a hash function which expect a ubye[] array as argument, would just work if I cast string to ubyte[] but I need to convert it to upper case, so I'd like to do that lazily, so that the byte is converted to its upper case version soon as it's requested. I'm not sure if this possible because I think the function should also work with Range and not ubyte[] to work. So, adding some code example, can I convert the string to upper case then convert it to ubyte[] without memory allocation? something like this: import xxhash; import std.uni : asUpperCase; uint hash = xxhashOf(cast(ubyte[])(word.asUpperCase));
Re: Interfacing with C++ Class named Object
On 2018-05-01 17:14:53 +, Robert M. Münch said:
Yes, great! Thanks. I could extend the code now. But I get a next problem:
extern (C++, b2d) {
class AnyBase {
bool isShared();
}
pragma(mangle, "Object");
class b2dObject : AnyBase {
}
class Image : b2dObject {
// class Image {
uint create(int w, int h, uint pixelFormat);
}
}
The linke complains about missing symbols:
error LNK2001: "public: virtual bool __cdecl
b2d::AnyBase::isShared(void)" (?isShared@AnyBase@b2d@@UEBA_NXZ)
error LNK2001: "public: virtual unsigned int __cdecl
b2d::Image::create(int,int,unsigned int)"
(?create@Image@b2d@@UEAAIHHI@Z)
I have in my C++ link lib:
?isShared@AnyBase@b2d@@QEBA_NXZ which demangles to => public: BOOL
__cdecl b2d::AnyBase::isShared(void)const __ptr64
So, the difference is the "virtual" specifier on the D side, while the
C++ mangeling is missing this. I have this for many functions.
Any idea how to handle this?
Answering myself. There is a final keyword missing:
class Image : b2dObject {
// class Image {
final uint create(int w, int h, uint pixelFormat);
}
With this it's working.
--
Robert M. Münch
http://www.saphirion.com
smarter | better | faster
Re: Interfacing with C++ Class named Object
On 2018-05-01 16:07:30 +, Timoses said:
On Tuesday, 1 May 2018 at 15:24:09 UTC, Robert M. Münch wrote:
Hi, I'm mostly doing simple C-API wrappers around C++ code to access
thigns from D. However, I wanted to try how far I can come using C++
directly.
I have the following C++ code in namespace N:
class Image : public Object {
Error create(int w, int h, uint32_t p) noexcept;
}
And I have the following D code:
extern (C++, N) {
class Object {
}
class Image : public Object {
uint create(int w, int h, uint pixelFormat);
}
}
So frist problem I see is, that a C++ class names Object is pretty
unfortunate as this is a reserved class name in D. And DMD doesn't seem
to allow using Object inside a C++ scope (which IMO should be possible).
Am I right, that there is no chance to handle this case other than
ranming the C++ base class?
Would `pragma(mangle, ...)` work here?
https://dlang.org/spec/pragma.html#mangle
Yes, great! Thanks. I could extend the code now. But I get a next problem:
extern (C++, b2d) {
class AnyBase {
bool isShared();
}
pragma(mangle, "Object");
class b2dObject : AnyBase {
}
class Image : b2dObject {
// class Image {
uint create(int w, int h, uint pixelFormat);
}
}
The linke complains about missing symbols:
error LNK2001: "public: virtual bool __cdecl
b2d::AnyBase::isShared(void)" (?isShared@AnyBase@b2d@@UEBA_NXZ)
error LNK2001: "public: virtual unsigned int __cdecl
b2d::Image::create(int,int,unsigned int)"
(?create@Image@b2d@@UEAAIHHI@Z)
I have in my C++ link lib:
?isShared@AnyBase@b2d@@QEBA_NXZ which demangles to => public: BOOL
__cdecl b2d::AnyBase::isShared(void)const __ptr64
So, the difference is the "virtual" specifier on the D side, while the
C++ mangeling is missing this. I have this for many functions.
Any idea how to handle this?
--
Robert M. Münch
http://www.saphirion.com
smarter | better | faster
Re: Interfacing with C++ Class named Object
On Tuesday, 1 May 2018 at 15:24:09 UTC, Robert M. Münch wrote:
Hi, I'm mostly doing simple C-API wrappers around C++ code to
access thigns from D. However, I wanted to try how far I can
come using C++ directly.
I have the following C++ code in namespace N:
class Image : public Object {
Error create(int w, int h, uint32_t p) noexcept;
}
And I have the following D code:
extern (C++, N) {
class Object {
}
class Image : public Object {
uint create(int w, int h, uint pixelFormat);
}
}
So frist problem I see is, that a C++ class names Object is
pretty unfortunate as this is a reserved class name in D. And
DMD doesn't seem to allow using Object inside a C++ scope
(which IMO should be possible).
Am I right, that there is no chance to handle this case other
than ranming the C++ base class?
Would `pragma(mangle, ...)` work here?
https://dlang.org/spec/pragma.html#mangle
Re: D in SUSE Enterprise Linux
On 02/05/2018 3:51 AM, Vino wrote: On Tuesday, 1 May 2018 at 15:42:38 UTC, Jonathan M Davis wrote: On Tuesday, May 01, 2018 15:18:12 Vino via Digitalmars-d-learn wrote: On Tuesday, 1 May 2018 at 15:04:43 UTC, rikki cattermole wrote: > On 02/05/2018 2:56 AM, Vino wrote: >> [...] > > Does this work? > > $ dmd -run foo.d Hi Rikki, No, it is not working, rather getting an error, and the user i executed is the root user. if i compile the program as dmd and then execute it as ./ it works fine, so is rdmd not supported in Linux. Error: /tmp/dmd_runqfz3ul: Permission denied That sounds like your /tmp is mounted with noexec. which won't work with rdmd or any other program that expects to be able to create a file in /tmp and run it. Presumably, you'll need to change the settings in /etc/fstab so that /tmp is not mounted with noexec. - Jonathan M Davis Hi Jonathan, Yes the /tmp is mounted with noexec option , we should not change this option as it is a security violation so is there any other way we can make it work, it tried setting the tmp env variable to a local FS which is mounted with the noexec option but it did not work. From, Vino.B Modify rdmd to use another directory which is more acceptable for your setup.
Re: D in SUSE Enterprise Linux
On Tuesday, May 01, 2018 15:51:14 Vino via Digitalmars-d-learn wrote: > On Tuesday, 1 May 2018 at 15:42:38 UTC, Jonathan M Davis wrote: > > On Tuesday, May 01, 2018 15:18:12 Vino via Digitalmars-d-learn > > > > wrote: > >> On Tuesday, 1 May 2018 at 15:04:43 UTC, rikki cattermole wrote: > >> > On 02/05/2018 2:56 AM, Vino wrote: > >> >> [...] > >> > > >> > Does this work? > >> > > >> > $ dmd -run foo.d > >> > >> Hi Rikki, > >> > >> No, it is not working, rather getting an error, and the user > >> > >> i > >> executed is the root user. if i compile the program as dmd > >> and then execute it as ./ it works > >> fine, so is rdmd not supported in Linux. > >> > >> Error: > >> /tmp/dmd_runqfz3ul: Permission denied > > > > That sounds like your /tmp is mounted with noexec. which won't > > work with rdmd or any other program that expects to be able to > > create a file in /tmp and run it. Presumably, you'll need to > > change the settings in /etc/fstab so that /tmp is not mounted > > with noexec. > > > > - Jonathan M Davis > > Hi Jonathan, > >Yes the /tmp is mounted with noexec option , we should not > change this option as it is a security violation so is there any > other way we can make it work, it tried setting the tmp env > variable to a local FS which is mounted with the noexec option > but it did not work. Whether it's really a security risk is up for debate, though I'm sure that concerns over that would be why /tmp is mounted with noexec on your system. Looking at rdmd --help, it does list a --tmpdir flag, so if you have another directory that is not mounted noexec where you would consider it acceptable to have temporary files be created and executed, then you can use --tmpdir to tell rdmd to use it. So, presumably, the shebang line would then be something like #!/usr/bin/env rdmd --tmpdir=/some/other/tmp/dir though I haven't tested it. - Jonathan M Davis
Re: D in SUSE Enterprise Linux
On Tuesday, 1 May 2018 at 15:42:38 UTC, Jonathan M Davis wrote: On Tuesday, May 01, 2018 15:18:12 Vino via Digitalmars-d-learn wrote: On Tuesday, 1 May 2018 at 15:04:43 UTC, rikki cattermole wrote: > On 02/05/2018 2:56 AM, Vino wrote: >> [...] > > Does this work? > > $ dmd -run foo.d Hi Rikki, No, it is not working, rather getting an error, and the user i executed is the root user. if i compile the program as dmd and then execute it as ./ it works fine, so is rdmd not supported in Linux. Error: /tmp/dmd_runqfz3ul: Permission denied That sounds like your /tmp is mounted with noexec. which won't work with rdmd or any other program that expects to be able to create a file in /tmp and run it. Presumably, you'll need to change the settings in /etc/fstab so that /tmp is not mounted with noexec. - Jonathan M Davis Hi Jonathan, Yes the /tmp is mounted with noexec option , we should not change this option as it is a security violation so is there any other way we can make it work, it tried setting the tmp env variable to a local FS which is mounted with the noexec option but it did not work. From, Vino.B
Re: Equivalent function of timeCreated for Linux
On Tuesday, May 01, 2018 15:41:07 Vino via Digitalmars-d-learn wrote:
> Hi All,
>
> Request your help, what is the equivalent function of
> timeCreated(Windows) for Linux. Or how do i get the file creation
> date and time in Linux using D.
AFAIK, no filesystems on Linux keep track of that information, and if they
do, you can't get at it via the normal OS API calls for getting file
information. The closest that you're likely to get was the time that the
file was last modified. The OS API call for getting information on POSIX
systems is the stat command, and as can be seen on the man page
https://linux.die.net/man/2/stat
this is the information provided on Linux:
struct stat {
dev_t st_dev; /* ID of device containing file */
ino_t st_ino; /* inode number */
mode_tst_mode;/* protection */
nlink_t st_nlink; /* number of hard links */
uid_t st_uid; /* user ID of owner */
gid_t st_gid; /* group ID of owner */
dev_t st_rdev;/* device ID (if special file) */
off_t st_size;/* total size, in bytes */
blksize_t st_blksize; /* blocksize for file system I/O */
blkcnt_t st_blocks; /* number of 512B blocks allocated */
time_tst_atime; /* time of last access */
time_tst_mtime; /* time of last modification */
time_tst_ctime; /* time of last status change */
};
The only fields related to time are
time_tst_atime; /* time of last access */
time_tst_mtime; /* time of last modification */
time_tst_ctime; /* time of last status change */
and the file creation time is not one of them. That's why D's std.file does
not provide a way to get at the file creation time on any non-Windows
systems. Windows tracks the file creation and has calls to provide that
information, whereas POSIX systems do not. So, std.file provides that
information on Windows but not on other systems.
- Jonathan M Davis
Equivalent function of timeCreated for Linux
Hi All, Request your help, what is the equivalent function of timeCreated(Windows) for Linux. Or how do i get the file creation date and time in Linux using D. From, Vino.B
Re: D in SUSE Enterprise Linux
On Tuesday, May 01, 2018 15:18:12 Vino via Digitalmars-d-learn wrote:
> On Tuesday, 1 May 2018 at 15:04:43 UTC, rikki cattermole wrote:
> > On 02/05/2018 2:56 AM, Vino wrote:
> >> Hi All,
> >>
> >> Request your help, trying to execute the below program in
> >>
> >> SUSE Linux but there is no output
> >>
> >>
> >> Code
> >> #!/usr/bin/env rdmd
> >> import std.stdio;
> >>
> >> void main() {
> >> writeln("Test");
> >> }
> >>
> >> DMD Version : DMD64 D Compiler v2.079.1
> >> Package installed : dmd-2.079.1-0.openSUSE.x86_64.rpm
> >>
> >> Execution 1 : rdmd without this #!/usr/bin/env
> >> rdmd
> >> Execution 2: ./ with #!/usr/bin/env rdmd + chmod
> >> 777
> >>
> >> Both ways there is on output
> >>
> >>
> >> From,
> >> Vino.B
> >
> > Does this work?
> >
> > $ dmd -run foo.d
>
> Hi Rikki,
>
> No, it is not working, rather getting an error, and the user i
> executed is the root user. if i compile the program as dmd
> and then execute it as ./ it works
> fine, so is rdmd not supported in Linux.
>
> Error:
> /tmp/dmd_runqfz3ul: Permission denied
That sounds like your /tmp is mounted with noexec. which won't work with
rdmd or any other program that expects to be able to create a file in /tmp
and run it. Presumably, you'll need to change the settings in /etc/fstab so
that /tmp is not mounted with noexec.
- Jonathan M Davis
Interfacing with C++ Class named Object
Hi, I'm mostly doing simple C-API wrappers around C++ code to access
thigns from D. However, I wanted to try how far I can come using C++
directly.
I have the following C++ code in namespace N:
class Image : public Object {
Error create(int w, int h, uint32_t p) noexcept;
}
And I have the following D code:
extern (C++, N) {
class Object {
}
class Image : public Object {
uint create(int w, int h, uint pixelFormat);
}
}
So frist problem I see is, that a C++ class names Object is pretty
unfortunate as this is a reserved class name in D. And DMD doesn't seem
to allow using Object inside a C++ scope (which IMO should be possible).
Am I right, that there is no chance to handle this case other than
ranming the C++ base class?
--
Robert M. Münch
http://www.saphirion.com
smarter | better | faster
Re: D in SUSE Enterprise Linux
On Tuesday, 1 May 2018 at 15:04:43 UTC, rikki cattermole wrote:
On 02/05/2018 2:56 AM, Vino wrote:
Hi All,
Request your help, trying to execute the below program in
SUSE Linux but there is no output
Code
#!/usr/bin/env rdmd
import std.stdio;
void main() {
writeln("Test");
}
DMD Version : DMD64 D Compiler v2.079.1
Package installed : dmd-2.079.1-0.openSUSE.x86_64.rpm
Execution 1 : rdmd without this #!/usr/bin/env
rdmd
Execution 2: ./ with #!/usr/bin/env rdmd + chmod
777
Both ways there is on output
From,
Vino.B
Does this work?
$ dmd -run foo.d
Hi Rikki,
No, it is not working, rather getting an error, and the user i
executed is the root user. if i compile the program as dmd
and then execute it as ./ it works
fine, so is rdmd not supported in Linux.
Error:
/tmp/dmd_runqfz3ul: Permission denied
From,
Vino.B
Re: D in SUSE Enterprise Linux
On 02/05/2018 2:56 AM, Vino wrote:
Hi All,
Request your help, trying to execute the below program in SUSE Linux
but there is no output
Code
#!/usr/bin/env rdmd
import std.stdio;
void main() {
writeln("Test");
}
DMD Version : DMD64 D Compiler v2.079.1
Package installed : dmd-2.079.1-0.openSUSE.x86_64.rpm
Execution 1 : rdmd without this #!/usr/bin/env rdmd
Execution 2: ./ with #!/usr/bin/env rdmd + chmod 777
Both ways there is on output
From,
Vino.B
Does this work?
$ dmd -run foo.d
D in SUSE Enterprise Linux
Hi All,
Request your help, trying to execute the below program in SUSE
Linux but there is no output
Code
#!/usr/bin/env rdmd
import std.stdio;
void main() {
writeln("Test");
}
DMD Version : DMD64 D Compiler v2.079.1
Package installed : dmd-2.079.1-0.openSUSE.x86_64.rpm
Execution 1 : rdmd without this #!/usr/bin/env
rdmd
Execution 2: ./ with #!/usr/bin/env rdmd + chmod
777
Both ways there is on output
From,
Vino.B
Re: Purity of delegate-style toString
On 05/01/2018 01:44 PM, Per Nordlöw wrote:
In which cases (if any) is it possible to make a delegate-style
implementation of toString such as
void toString(scope void delegate(const(char)[]) sink) const
@trusted pure
{
// sink("...");
// sink.formattedWrite!"..."(...);
}
pure?
You have to mark `sink` as pure, too:
void toString(scope void delegate (const(char)[]) pure sink)
const @trusted pure
Then the toString method itself works, but it may not be callable by
other code that wants to use an impure sink.
For example, `format` works, but `writeln` doesn't:
struct S
{
void toString(scope void delegate(const(char)[]) pure sink)
const @trusted pure
{
import std.format: formattedWrite;
sink("...");
sink.formattedWrite!"%s"(" ...");
}
}
void main()
{
import std.format: format;
import std.stdio: writeln;
writeln(format("%s", S())); /* Ok. Prints "... ...". */
writeln(S()); /* Nope. writeln would like to use an impure sink. */
}
By the way, you shouldn't mark toString as @trusted when `sink` is @system.
Purity of delegate-style toString
In which cases (if any) is it possible to make a delegate-style
implementation of toString such as
void toString(scope void delegate(const(char)[]) sink) const
@trusted pure
{
// sink("...");
// sink.formattedWrite!"..."(...);
}
pure?
Re: Coding Challenges at Dconf2018: Implement Needleman–Wunsch and Smith–Waterman algorithms
On 01/05/2018 9:00 PM, biocyberman wrote: On Monday, 30 April 2018 at 20:34:41 UTC, Steven Schveighoffer wrote: On 4/30/18 2:47 PM, biocyberman wrote: Hellow D community. I am attending Dconf 2018 and giving a talk there on May 4. Link: https://dconf.org/2018/talks/le.html. It will be very interesting to talk about the outcome of the following challenges. If we can't have at least 3 solutions by three individuals by 10:00 GMT+2 May 4, I will have to postpone the deadline one week. Please see below for more details. This should really go in announce ;) -Steve Thought about that too. But then I imagined the "announce" is for official use of the D dev team and forum admins. It isn't.
Re: Coding Challenges at Dconf2018: Implement Needleman–Wunsch and Smith–Waterman algorithms
On Monday, 30 April 2018 at 20:34:41 UTC, Steven Schveighoffer wrote: On 4/30/18 2:47 PM, biocyberman wrote: Hellow D community. I am attending Dconf 2018 and giving a talk there on May 4. Link: https://dconf.org/2018/talks/le.html. It will be very interesting to talk about the outcome of the following challenges. If we can't have at least 3 solutions by three individuals by 10:00 GMT+2 May 4, I will have to postpone the deadline one week. Please see below for more details. This should really go in announce ;) -Steve Thought about that too. But then I imagined the "announce" is for official use of the D dev team and forum admins. These challenges are for learning and for fun, therefore I put them topic here. Anyway, I can't move this to announce now.
