Re: Is there any bettter solution to Windows wide string
On Saturday, 8 May 2021 at 20:50:10 UTC, Vinod K Chandran wrote:
Hi all,
I am planning some win32 hobby projects. Now I have this
function to tackle the LPCWSTR data type in win32.
```d
private import std.utf;
auto toWString(S)(S s) { return toUTFz!(const(wchar)*)(s); }
```
Is there any better way to do this ?
You may try using tempCStringW from std.internal.cstring. It uses
small string optimization. However the api is internal, so I'm
not sure how valid it is to use this function. The returned
struct is a temporary buffer so you must ensure that you don't
escape dangling pointers.
Remove routes from URLRouter in vibe.d
I want to be able to dynamically remove some routes in my Vibe.d application. URLRouter accounts for newly added routes, but I can't find a way to clear routes unless I create the new URLRouter object, in which case I also need to re-create HTTP listener. Also, is it safe to replace already existing route handlers?
Re: Getting the source text of an expression
On Thursday, 17 December 2020 at 19:45:38 UTC, Dave P. wrote:
In C, you can use a macro to get the source text of an
expression as a string. For example
#include
#define PRINT_INT(x) printf(#x " = %d\n", x)
int main(){
// prints "3 = 3"
PRINT_INT(3);
int x = 4;
// prints "x = 4"
PRINT_INT(x);
#define FOO 5
// prints "FOO = 5"
PRINT_INT(FOO);
#define BAR FOO
// prints "BAR = 5"
PRINT_INT(BAR);
return 0;
}
Is there a feature of D that allows you to achieve a similar
goal? I’ve used this in the past for logging for example.
Something like that?
import std.stdio;
void print_int(alias n)()
{
writeln(n.stringof~"=", n);
}
void main()
{
int x = 42;
print_int!(x);
print_int!(7);
}
Re: How can I set Timeout of Socket?
On Sunday, 15 November 2020 at 00:05:08 UTC, Marcone wrote:
Socket s = new Socket(AddressFamily.INET, SocketType.STREAM);
s.connect(new InternetAddress("domain.com", 80));
I want that program raise an error if reach for example 30
seconds of timeout.
Perhaps using Socket.select and SocketSet?
import std.socket;
import std.stdio;
import core.time;
void main()
{
Socket s = new Socket(AddressFamily.INET, SocketType.STREAM);
s.blocking = false;
auto set = new SocketSet(1);
set.add(s);
s.connect(new InternetAddress("dlang.org", 80));
scope(exit) s.close();
Socket.select(null, set, null, dur!"seconds"(10));
if (set.isSet(s))
{
writeln("socket is ready");
}
else
{
writeln("could not connect");
}
}
Re: Renaming Flag!"" in API
On Monday, 12 October 2020 at 16:44:52 UTC, Ali Çehreli wrote: It's amazing how things come together before each conference. Flag appears among my slides for an upcoming conference as well! :) But I don't think there is any solution to your problem. On 10/12/20 3:24 AM, FreeSlave wrote: > Later I realize that 'myflagname' is a bad name and I want to change it > to something else. But if I do so, I break the existing code using this > API as Flag with different name will be a different type This is essentially the same as one of the objections to named arguments. Ali Huh, never thought about named arguments in this way. Yet some syntax for parameter name aliasing could be invented to refer to the same parameter by different names if D ever gets named arguments feature.
Re: Renaming Flag!"" in API
On Monday, 12 October 2020 at 11:34:25 UTC, Vladimir Panteleev wrote: On Monday, 12 October 2020 at 10:24:44 UTC, FreeSlave wrote: Can this issue overcome somehow? Why not add a deprecated overload for your function which takes the old Flag value? I thought about overloading too. Templatizing the parameter is fitting too especially if the function is already templated. I think I'll go with the latter. Yet in general it would be a tedious work to add template constraints or overloads (and in case of overloads there's also a lot of copy-pasting included) to all functions that use this flag as parameter if there were too many of them. Some way to declare two flag types as implicitly convertable would be nice.
Renaming Flag!"" in API
Let's say I use Flag type named 'myflagname' in API like this:
import std.typecons;
void func(Flag!"myflagname" flag)
{
//...
}
void main()
{
func(Yes.myflagname);
}
Later I realize that 'myflagname' is a bad name and I want to
change it to something else. But if I do so, I break the existing
code using this API as Flag with different name will be a
different type and Yes.myflagname and No.myflagname won't fit in.
I can't use alias as Yes and No relies on string literal.
Can this issue overcome somehow? Looks like a fundamental flaw
with std.typecons.Flag.
More complete windows declarations
Druntime has a limited set of declarations, lacking some COM interfaces, e.g. IShellItem and IFileOperation (the latter is understandable though as it was introduced in Vista, and I guess druntime declarartions are limited to symbols from XP), and some others are declared wrongly (e.g. IShellFolder2 has duplicated declarations of methods derived from IShellFolder). Is there any project on porting missing declarartions to D?
Re: Access violation when using IShellFolder2
On Thursday, 10 September 2020 at 15:20:54 UTC, John Chapman wrote: On Thursday, 10 September 2020 at 13:30:15 UTC, FreeSlave wrote: Thanks. I tried this, but VarDateFromStr does not succeed for me. It turns out the shell embeds some control characters in the string, specifically 8206 and 8207. So remove those before passing it to VarDateFromStr. auto temp = strRet.pOleStr[0 .. lstrlenW(strRet.pOleStr)] .replace(cast(wchar)8206, "") .replace(cast(wchar)8207, ""); DATE date; VarDateFromStr((temp ~ '\0').ptr, LOCALE_USER_DEFAULT, 0, ); Thank you again for consulting. I thought these character are part of the date format. This is all working now.
Re: Access violation when using IShellFolder2
On Thursday, 10 September 2020 at 06:43:35 UTC, John Chapman
wrote:
On Wednesday, 9 September 2020 at 22:44:50 UTC, FreeSlave wrote:
Btw do you know how to parse a date returned by GetDetailsOf?
Couldn't find any examples in C++. I actually can see digits
representing date and time as a part of the string, but I
would prefer to use some winapi function to translate it into
some time type instead of manually parsing the result.
You could look at passing the str.pOleStr field in the
SHELLDETAILS you got from GetDetailsOf to VarDateFromStr. It
will give you a DATE value that VariantTimeToSystemTime will
convert to a SYSTEMTIME from which you can get the years,
months, days etc.
For example:
SHELLDETAILS details;
GetDetailsOf(pidl, 3, );
DATE date;
VarDateFromStr(details.str.pOleStr, LOCALE_USER_DEFAULT, 0,
);
SYSTEMTIME st;
VariantTimeToSystemTime(date, );
auto year = st.wYear;
auto month = st.wMonth;
You can convert that into a more D-friendly SysTime object
using SYSTEMTIMEToSysTime from the std.datetime package.
Thanks. I tried this, but VarDateFromStr does not succeed for me.
Here's the updated example. Note that I use a column 2 to
retrieve the date because that's the deletion date column for
recycle bin folder.
import core.sys.windows.windows;
import core.sys.windows.shlobj;
import core.sys.windows.wtypes;
import core.sys.windows.oaidl;
import std.exception;
import std.datetime;
pragma(lib, "Ole32");
pragma(lib, "OleAut32");
interface IShellFolder2 : IShellFolder {
HRESULT GetDefaultSearchGUID(GUID*);
HRESULT EnumSearches(IEnumExtraSearch*);
HRESULT GetDefaultColumn(DWORD, ULONG*, ULONG*);
HRESULT GetDefaultColumnState(UINT, SHCOLSTATEF*);
HRESULT GetDetailsEx(LPCITEMIDLIST, const(SHCOLUMNID)*,
VARIANT*);
HRESULT GetDetailsOf(LPCITEMIDLIST, UINT, SHELLDETAILS*);
HRESULT MapColumnToSCID(UINT, SHCOLUMNID*);
}
import std.stdio;
static @trusted string StrRetToString(ref scope STRRET strRet)
{
import std.string : fromStringz;
switch (strRet.uType)
{
case STRRET_CSTR:
return fromStringz(strRet.cStr.ptr).idup;
case STRRET_OFFSET:
writeln("STRRET_OFFSET!");
return string.init;
case STRRET_WSTR:
char[MAX_PATH] szTemp;
auto len = WideCharToMultiByte (CP_UTF8, 0,
strRet.pOleStr, -1, szTemp.ptr, szTemp.sizeof, null, null);
scope(exit) CoTaskMemFree(strRet.pOleStr);
if (len)
return szTemp[0..len-1].idup;
else
return string.init;
default:
return string.init;
}
}
static @trusted SysTime StrRetToSysTime(ref scope STRRET strRet)
{
enforce(strRet.uType == STRRET_WSTR, "Expected STRRET_WSTR");
DATE date;
enforce(SUCCEEDED(VarDateFromStr(strRet.pOleStr,
LOCALE_USER_DEFAULT, 0, )), "Failed to convert string to
date value");
SYSTEMTIME sysTime;
VariantTimeToSystemTime(date, );
return SYSTEMTIMEToSysTime();
}
void main()
{
OleInitialize(null);
scope(exit) OleUninitialize();
IShellFolder desktop;
LPITEMIDLIST pidlRecycleBin;
enforce(SUCCEEDED(SHGetDesktopFolder()), "Failed to
get desktop shell folder");
assert(desktop);
scope(exit) desktop.Release();
enforce(SUCCEEDED(SHGetSpecialFolderLocation(null,
CSIDL_BITBUCKET, )), "Failed to get recycle bin
location");
assert(pidlRecycleBin);
scope(exit) ILFree(pidlRecycleBin);
IShellFolder2 recycleBin;
enforce(SUCCEEDED(desktop.BindToObject(pidlRecycleBin, null,
_IShellFolder2, cast(LPVOID *))), "Failed to get
recycle bin shell folder");
assert(recycleBin);
scope(exit) recycleBin.Release();
IEnumIDList enumFiles;
with(SHCONTF) enforce(SUCCEEDED(recycleBin.EnumObjects(null,
SHCONTF_FOLDERS | SHCONTF_NONFOLDERS | SHCONTF_INCLUDEHIDDEN,
)), "Failed to enumerate objects in recycle bin");
scope(exit) enumFiles.Release();
LPITEMIDLIST pidl;
while (enumFiles.Next(1, , null) != S_FALSE) {
string name;
string originalLocation;
SysTime deletionTime;
SHELLDETAILS details;
if(SUCCEEDED(recycleBin.GetDetailsOf(pidl,0,)))
{
name = StrRetToString(details.str);
}
if(SUCCEEDED(recycleBin.GetDetailsOf(pidl,1,)))
{
originalLocation = StrRetToString(details.str);
}
if(SUCCEEDED(recycleBin.GetDetailsOf(pidl,2,)))
{
deletionTime = StrRetToSysTime(details.str);
}
writefln("Name: %s, original location: %s, datetime: %s",
name, originalLocation, deletionTime);
CoTaskMemFree(pidl);
}
}
Re: Access violation when using IShellFolder2
On Wednesday, 9 September 2020 at 07:18:04 UTC, John Chapman
wrote:
On Tuesday, 8 September 2020 at 22:24:22 UTC, FreeSlave wrote:
However if I change the type of recycleBin variable to
IShellFolder (not IShellFolder2), the crash does not happen.
Does IShellFolder2 require some special handling?
The issue is caused by druntime's definition of IShellFolder2.
To fix it temporarily, just redefine it in your module
somewhere:
interface IShellFolder2 : IShellFolder {
HRESULT GetDefaultSearchGUID(GUID*);
HRESULT EnumSearches(IEnumExtraSearch*);
HRESULT GetDefaultColumn(DWORD, ULONG*, ULONG*);
HRESULT GetDefaultColumnState(UINT, SHCOLSTATEF*);
HRESULT GetDetailsEx(LPCITEMIDLIST, const(SHCOLUMNID)*,
VARIANT*);
HRESULT GetDetailsOf(LPCITEMIDLIST, UINT, SHELLDETAILS*);
HRESULT MapColumnToSCID(UINT, SHCOLUMNID*);
}
IShellFolder2 isn't the only culprit - IShellView2 will need
fixing too if you intend to use it. There are probably others
as well.
Redefinition did the trick, thank you.
Btw do you know how to parse a date returned by GetDetailsOf?
Couldn't find any examples in C++. I actually can see digits
representing date and time as a part of the string, but I would
prefer to use some winapi function to translate it into some time
type instead of manually parsing the result.
Access violation when using IShellFolder2
Consider the following code:
import core.sys.windows.windows;
import core.sys.windows.shlobj;
import core.sys.windows.wtypes;
import std.exception;
pragma(lib, "Ole32");
void main()
{
OleInitialize(null);
scope(exit) OleUninitialize();
IShellFolder desktop;
LPITEMIDLIST pidlRecycleBin;
enforce(SUCCEEDED(SHGetDesktopFolder()), "Failed to
get desktop shell folder");
assert(desktop);
scope(exit) desktop.Release();
enforce(SUCCEEDED(SHGetSpecialFolderLocation(null,
CSIDL_BITBUCKET, )), "Failed to get recycle bin
location");
assert(pidlRecycleBin);
scope(exit) ILFree(pidlRecycleBin);
IShellFolder2 recycleBin;
enforce(SUCCEEDED(desktop.BindToObject(pidlRecycleBin, null,
_IShellFolder2, cast(LPVOID *))), "Failed to get
recycle bin shell folder");
assert(recycleBin);
scope(exit) recycleBin.Release();
IEnumIDList enumFiles;
with(SHCONTF) enforce(SUCCEEDED(recycleBin.EnumObjects(null,
SHCONTF_FOLDERS | SHCONTF_NONFOLDERS | SHCONTF_INCLUDEHIDDEN,
)), "Failed to enumerate objects in recycle bin");
enumFiles.Release();
}
For me this code crashes with error:
object.Error@(0): Access Violation
0x75B4EBB8 in SHELL32_CLocationContextMenu_Create
0x004023A9
0x0040493B
0x004048B5
0x0040474E
0x00402C9A
0x0040250B
0x75816359 in BaseThreadInitThunk
0x76F07C24 in RtlGetAppContainerNamedObjectPath
0x76F07BF4 in RtlGetAppContainerNamedObjectPath
However if I change the type of recycleBin variable to
IShellFolder (not IShellFolder2), the crash does not happen.
Does IShellFolder2 require some special handling?
Re: Vibe.d timer - change callback?
On Tuesday, 25 August 2020 at 18:42:53 UTC, codic wrote:
I'd like to be able to change the callback of a vibe.d Timer
(eg created with
http://vibe-core.dpldocs.info/v1.9.3/vibe.core.core.createTimer.html) after creation, something like:
auto timer = createTimer();
timer.rearm(duration, /*...*/);
timer.callback = delegate {
// things
}
An alternative method would be to recreate the timer, like so:
auto timer = createTimer();
timer.rearm(duration, /*...*/);
auto timer = createTimer();
timer.rearm(duration - timer.elapsed);
However, I can't find an `elapsed` property or similar in the
documentation.
I did not try it myself, but you can make an object which is
accessible from both callback scope and outside scope. Depending
on the state of the object it will call different functions. So
if you want to change the callback in the meantime, you just
change the state of the object.
Re: How to get the element type of an array?
On Tuesday, 25 August 2020 at 03:41:06 UTC, Jon Degenhardt wrote: What's the best way to get the element type of an array at compile time? Something like std.range.ElementType except that works on any array type. There is std.traits.ForeachType, but it wasn't clear if that was the right thing. --Jon Why not just use typeof(a[0]) It does not matter if array is empty or not. Typeof does not actually evaluate its expression, just the type.
Re: Returning range of inout objects from inout method
On Saturday, 25 July 2020 at 14:19:15 UTC, Steven Schveighoffer
wrote:
The only way to do this without code duplication (but with
generated code duplication) is to template the byAction
function on the type of `this`:
auto byAction(this This)() { /* same implementation */ }
Note that this ONLY works if your base range type is an array.
If you have a custom range type, you need to parameterize that
based on the constness of `This`.
-Steve
Thanks. I thought this template is useful only in inheritance.
Is constness of member function inferred automatically in this
case?
Re: Result and Option types
On Saturday, 25 July 2020 at 18:06:51 UTC, powerboat9 wrote: Does dlang have an analog to Result or Option types from rust? Standard library has std.typecons.Nullable https://dlang.org/phobos/std_typecons.html#Nullable Note that objects are nullable by themselves as classes are reference types. As for Result it's easy to implement using Tuple and writing some additional functions.
Returning range of inout objects from inout method
I want to be able to return a range of const objects from the
const object and a range mutable objects from the mutable object.
inout comes to mind, but not applicable in this case, because
inout must be applied to the return type as whole, which does not
make much sense for the range. Defining range of inout objects
does not work too. See the example.
import std.range;
class A
{
string name;
}
class B
{
A[] _actions;
ForwardRange!(inout(A)) byAction() inout { // can't instance
this type
import std.algorithm : filter;
return inputRangeObject(_actions.filter!(a => a !is null
&& a.name.length));
}
}
So how can I achieve the intended effect without code
duplication? (like making separate mutable and const versions of
the method).
Re: std.process - avoid interaction with parent shell
On Monday, 20 July 2020 at 20:55:52 UTC, Steven Schveighoffer wrote: I don't want any user interaction. Occasionally, I get a repository that no longer exists (404). Then git comes up and asks for a username/password. I want it to just fail. Apparently git has no option to be non-interactive, it supposedly checks stdin to see if it's a tty, and only errors if it's not. -Steve Try setting GIT_TERMINAL_PROMPT=0 as an environment variable.
Redundant function calls in filtered joined range
Consider the following code. It counts the number of
subdirectories in directories provided via commandline args.
import std.stdio;
import std.algorithm;
import std.file;
import std.range;
import std.exception;
@trusted bool isDirNothrow(string dir) nothrow
{
bool ok;
collectException(dir.isDir(), ok);
return ok;
}
auto subDirs(Range)(Range searchDirs)
if(is(ElementType!Range : string))
{
return searchDirs
.filter!(isDirNothrow).map!(function(dir) {
return dir.dirEntries(SpanMode.shallow)
.filter!(isDirNothrow);
}).cache().joiner;
}
int main(string[] args)
{
auto r = args[1..$].subDirs;
writefln("Found %s subdirs", count(r));
return 0;
}
Using strace I inspect how many stat calls it uses. Like this:
strace -C -e stat path/to/binary
strace reports some duplicated stat calls, specifically on the
first provided directory and first subdirectory of each
directories.
How can I avoid redundant stat calls? Adding array() after each
filter() removes duplicates but it leads to allocations
obviously. Changing the cache() to array() before joiner also
solve the issue.
I suspect there's something wrong in combination of filters and
joiner.
Re: what am I missing here with that working dir?
On Friday, 15 March 2019 at 21:48:50 UTC, DFTW wrote: What am I missing here? Maybe the terminal and your utility you run wkhtmltopdf from have different environment?
Re: std.process: spawnProcess
On Friday, 7 September 2018 at 16:44:09 UTC, Russel Winder wrote: I guess this might work on Windows, but I am on Linux and OSX, so I'll have to try another route. On Posix systems you may try using SIGCHLD handler. Google for exact examples.
Re: std.process: spawnProcess
On Friday, 7 September 2018 at 14:36:42 UTC, Russel Winder wrote: From what I can see, processes created with std.process: spawnProcess are not terminated when the creating process terminates, i.e. it seems Config.detached is the default for these process. No, detached is not default. By default you should call wait on processes to free OS resources. Process may stay as zombie otherwise and it can be visible in process manager. Is there a way of all spawned processes being terminated on main termination? You probably need to register all child processes. Or spawn them as detached so you won't need to worry about freeing them.
Re: Convert path to file system path on windows
On Thursday, 21 June 2018 at 18:46:05 UTC, Dr.No wrote:
How can I do that with D?
In C# you can do that:
var filename = @"C:\path\to\my\file.txt";
var file = new Uri(filename).AbsoluteUri;
// file is "file:///C:/path/to/my/file.txt"
How can I do that in D?
import std.stdio;
import std.exception;
import core.sys.windows.windows;
import std.windows.syserror;
@safe void henforce(HRESULT hres, lazy string msg = null, string
file = __FILE__, size_t line = __LINE__)
{
if (hres != S_OK)
throw new WindowsException(hres, msg, file, line);
}
@trusted wstring absoluteUri(string path)
{
import std.path : absolutePath;
import std.utf : toUTF16z;
import core.sys.windows.shlwapi;
import core.sys.windows.wininet;
auto shlwapi = wenforce(LoadLibraryA("Shlwapi"), "Failed to
load shlwapi");
enforce(shlwapi !is null);
auto urlCreateFromPath =
cast(typeof())wenforce(shlwapi.GetProcAddress("UrlCreateFromPathW"), "Failed to find UrlCreateFromPathW");
scope(exit) FreeLibrary(shlwapi);
wchar[INTERNET_MAX_URL_LENGTH] buf;
auto size = cast(DWORD)buf.length;
henforce(urlCreateFromPath(path.absolutePath.toUTF16z,
buf.ptr, , 0));
return buf[0..size].idup;
}
int main(string[] args)
{
foreach(path; args)
{
writeln(absoluteUri(path));
}
return 0;
}
Re: Idiomatic way to add examples to dub package
On Friday, 27 April 2018 at 12:37:04 UTC, Basile B. wrote: On Thursday, 26 April 2018 at 18:16:01 UTC, FreeSlave wrote: Most dub packages are libraries and should provide runnable examples. What's the current idiomatic way to add examples? IMO the most simple way (and the best too) is to put single file packages in the example folder, so that an example can just be run with DUB like that: `dub example1.d`. Other good point is that you can specify that the dependency to the main package is local, like here: https://github.com/BBasile/kheops/blob/master/runnable/actions_window.d#L5. And finally the example folder is neither polluted with sub-folders nor with sub.selection JSON, FTW. That's probably the best option. No need for using subPackages, nor for creating dub.json per every example. And no --root option is needed.
Idiomatic way to add examples to dub package
Most dub packages are libraries and should provide runnable examples. What's the current idiomatic way to add examples? I used sub-packages with dependency on the library and "*" as version and running them as dub run :examplename Now I've noticed vibed uses a different scheme - examples are like separate packages that are supposed to ran with --root option (if running from the library root directory) and specify the dependency with "path" property like here https://github.com/vibe-d/vibe.d/blob/master/examples/http_server/dub.json That involves more typing when running an example but keeps the main dub.json independent from examples (no need to specify sub-packages) Also I still don't understand if I need to include dub.selections.json in VCS repo. I read somewhere that it should be included but vibed examples don't have dub.selections.json. E.g. here https://github.com/dlang/dub/issues/829#issuecomment-215741874 jacob-carlborg said For applications the dub.selection.json files should be in version control, for libraries it should not be Examples are applications so I thought dub.selections.json should be included. But it may be an outdated information. If there're tutorials on both topics (how to include examples and when one should include dub.selections.json in VCS), I would like to read them. I could not find any useful info on code.dlang.org regarding these issues, while those look like basic issues that must be covered in manuals.
Re: Disk space used and free size of a Network share folder in Windows
On Wednesday, 14 February 2018 at 15:24:42 UTC, Vino wrote:
On Wednesday, 14 February 2018 at 12:29:13 UTC, rikki
cattermole wrote:
[...]
Hi Rikki,
Wouldn't this be easy to use with std.process: execute
package and calling wmic.exe, the only problem is i am not sure
hot to get the out put without the headings(Caption
FreeSpace,Size) any help on same is much appreciated.
import std.process: execute;
import std.stdio : writeln;
void main () {
version(Windows) {
auto result = execute(["wmic.exe", "logicaldisk", "get",
"size,freespace,caption"]);
writeln(result.output);
}
}
Output :
Caption FreeSpaceSize
C: 19702837248 180043665408
H: 85580382208 824633720832
From,
Vino.B
Don't call external processes when you can call a function.
Running another process is overhead and not reliable.
Re: Check whether a file is empty.
On Friday, 8 December 2017 at 19:13:20 UTC, vino wrote: Hi, The code is same just copy pasted the code form Windows 7 into Windows 2003 and executed, in Windows 7 the log file is of size 0 where as in windows 2003 the log file is of size 2 byte where the log file in both the server is empty. From, Vino.B What do you mean exactly by empty log file? If the file looks blank in notepad it does not mean it's empty. What are those 2 bytes? Which program does create this file? It may work differently depending on the system or different versions are installed.
Re: Check whether a file is empty.
On Friday, 8 December 2017 at 09:40:18 UTC, Vino wrote: Hi All, Request your help on how to check whether a given file is empty, I tried the getSize from std.file but no luck as in windows 7 is the file is empty the size of the file is 0 bytes but in Windows 2003 if the file is empty the size of the file show as 2 bytes. From, Vino.B Was it the same file on Windows 7 and Windows 2003? Maybe the file on Windows 2003 had a byte order mark or carriage return + newline characters.
Re: Generating DDOX documentation
On Friday, 20 October 2017 at 10:47:57 UTC, Andrew Edwards wrote: Given a documented source file (eg. process.d), I can generate the DDOC version of the documentation with the -D switch of DMD as such: $ dmd -Dfprocess.html process.d What do I modify on that line to get the DDOX version of the same file? Thanks, Andrew dmd has no knowledge of ddox. Ddox is a separate program that takes a json output of dmd ddoc and generates nicer docs. https://github.com/rejectedsoftware/ddox Example of usage: dmd -o- -X -Xfdocs.json [list of options that used to build the project, including the list of source files...] /path/to/ddox generate-html --navigation-type=ModuleTree docs.json docs/ If you're using dub to build your project, then generating ddox documentation as easy as dub build --build=ddox
Re: spawnProcess: Exit parent process without terminating child process
On Friday, 25 August 2017 at 19:55:09 UTC, timvol wrote:
Hi guys,
I want execute a process. I know, I can execute a process using
"spawnProcess" or "executeShell". But I want exit the parent.
My code for testing purposes is the following:
int main(string[] asArgs_p)
{
if ( (asArgs_p.length >= 2) && asArgs_p[1].isDir() )
{
while(1) {}
}
else
{
import std.process;
spawnProcess([asArgs_p[0], "test"]);
}
return 0;
}
So, starting the application without any parameter, it calls
"spawnProcess" with an parameter. Now, I want that the parent
process (the process started without parameter) terminates,
while the created process remains running.
At the moment, the parent process creates the child and remains
open (because of the while(1)-loop).
Any ideas how I can exit the parent and keep the child process
running?
Note that in your particular case the spawnProcess as used now
should work too. It should run in parallel with its parent.
Parent will exit and child process will remain. I'm not sure why
the parent does not exit in your case. When starting this program
without parameters it will not run into while(1) branch at all.
Re: spawnProcess: Exit parent process without terminating child process
On Friday, 25 August 2017 at 19:55:09 UTC, timvol wrote:
Hi guys,
I want execute a process. I know, I can execute a process using
"spawnProcess" or "executeShell". But I want exit the parent.
My code for testing purposes is the following:
int main(string[] asArgs_p)
{
if ( (asArgs_p.length >= 2) && asArgs_p[1].isDir() )
{
while(1) {}
}
else
{
import std.process;
spawnProcess([asArgs_p[0], "test"]);
}
return 0;
}
So, starting the application without any parameter, it calls
"spawnProcess" with an parameter. Now, I want that the parent
process (the process started without parameter) terminates,
while the created process remains running.
At the moment, the parent process creates the child and remains
open (because of the while(1)-loop).
Any ideas how I can exit the parent and keep the child process
running?
Running process in detached state will be available in the future
versions of Phobos. This functionality has been already merged in
master https://github.com/dlang/phobos/pull/5483
Until then you may consider to use a third-party library
https://github.com/FreeSlave/detached
Re: Atomicity of file-copying/moving
On Tuesday, 16 May 2017 at 08:32:56 UTC, Nordlöw wrote: What's the status of atomicity of file-copying and -moving (renaming) using std.file on different platforms? Not sure about renaming but copying is not atomic on Posix because it does not handle interruption by signal. I opened issue about that https://issues.dlang.org/show_bug.cgi?id=17296
Re: Why File is exists in std.stdio and in std.file?
On Tuesday, 25 April 2017 at 07:05:51 UTC, Suliman wrote: Just interesting. Is there any rational reasons for this decision? There's no File in std.file. It's located in std.stdio. std.stdio and std.file are different modules. The first one has safe wrappers around stdio.h from C library, the second one provides operations on files as unit.
Re: Cleaning up Dub/Dmd builds
On Tuesday, 18 April 2017 at 17:58:32 UTC, WhatMeWorry wrote:
On Tuesday, 18 April 2017 at 15:15:47 UTC, Stanislav Blinov
wrote:
On Tuesday, 18 April 2017 at 15:07:27 UTC, WhatMeWorry wrote:
When I try to upload these files to my new repo, GitHub
(rightfully so) complains that
I have too many files. Since I'm using sdl and not json, can
I safely delete all the files
that pertain to json? Can I do this some way at the command
line?
You shouldn't upload files from the .dub directory, that's
local build cache that shouldn't be published. You can simply
add the .dub directory to your .gitignore file.
Thanks. That seems like an elegant solution. Sorry if that is
documented somewhere. I never came across it or didn't
understand it when I did.
If you create dub project by "dub init" command it automatically
creates .gitignore file.
Also github provides premade .gitignore files for many
programming languages ("Add .gitignore" button on Create new
repository). Those files are from
https://github.com/github/gitignore repo.
Re: Interfacing C++ to D
On Sunday, 2 April 2017 at 16:03:51 UTC, FreeSlave wrote: On Sunday, 2 April 2017 at 16:02:06 UTC, FreeSlave wrote: On Sunday, 2 April 2017 at 09:58:19 UTC, ANtlord wrote: [...] Now I see. 'Using C++ Classes From D' crashes for me too. It also returns the wrong value from 'field' method. Should be 5, but it returns 0. Probably regression. Funny thing: If I replace interface with abstract class, it works as it should. Reported issue: https://issues.dlang.org/show_bug.cgi?id=17293
Re: Interfacing C++ to D
On Sunday, 2 April 2017 at 16:02:06 UTC, FreeSlave wrote: On Sunday, 2 April 2017 at 09:58:19 UTC, ANtlord wrote: On Saturday, 1 April 2017 at 16:39:28 UTC, FreeSlave wrote: This page has many examples. Which exactly do you try to run and how do you build it? Which compilers, OS? My bad. I've tested example under caption Using C++ Classes From D. I used several combinations of compilers, and no one works for me. OS: ArchLinux D compilers: DMD 2.073.2, LDC 1.1.0 C++ compiler: gcc 6.3.1, clang 3.9 Also I've created reposotory contains test project. Anyone can take a look on that for clearance. https://github.com/ANtlord/cpp_to_d_test Now I see. 'Using C++ Classes From D' crashes for me too. It also returns the wrong value from 'field' method. Should be 5, but it returns 0. Probably regression. Funny thing: If I replace interface with abstract class, it works as it should.
Re: Interfacing C++ to D
On Sunday, 2 April 2017 at 09:58:19 UTC, ANtlord wrote: On Saturday, 1 April 2017 at 16:39:28 UTC, FreeSlave wrote: This page has many examples. Which exactly do you try to run and how do you build it? Which compilers, OS? My bad. I've tested example under caption Using C++ Classes From D. I used several combinations of compilers, and no one works for me. OS: ArchLinux D compilers: DMD 2.073.2, LDC 1.1.0 C++ compiler: gcc 6.3.1, clang 3.9 Also I've created reposotory contains test project. Anyone can take a look on that for clearance. https://github.com/ANtlord/cpp_to_d_test Now I see. 'Using C++ Classes From D' crashes for me too. It also returns the wrong value from 'field' method. Should be 5, but it returns 0. Probably regression.
Re: Interfacing C++ to D
On Saturday, 1 April 2017 at 07:37:25 UTC, ANtlord wrote: Hello! Can somebody give a relevant example shows how to use C++ classes in D? I've used the exmaple from https://dlang.org/spec/cpp_interface.html but I get a segmentation fault as result of D application. My application shows "Program exited with code -11" Thanks. This page has many examples. Which exactly do you try to run and how do you build it? Which compilers, OS?
Re: Cannot spawn process: npm start
On Tuesday, 4 October 2016 at 17:02:34 UTC, Adam D. Ruppe wrote: On Tuesday, 4 October 2016 at 16:55:22 UTC, Andre Pany wrote: Spawn process is working fine on linux, only on windows it doesn't work. I will create a bug report. This isn't really a bug if it is a cmd file like the other poster said... cmd files are scripts that need to be run through the interpreter. shellExec probably handles it, or you could spawnProcess "cmd" with the npm being an argument to it. There's no shellExec, but executeShell. spawnShell would fit better since author used spawnProcess in original post. Whether spawnProcess should handle .bat and .cmd is a matter of function design really. Actually I would like to treat spawnProcess more like double-click on application and double-click works for scripts on windows. So there will be no special code for phobos user to handle this case.
Re: Cannot spawn process: npm start
On Tuesday, 4 October 2016 at 12:58:19 UTC, Andre Pany wrote: Hi, I need to call a Node application. node and npm are in windows path variable. I have following folder structure: ./app.d ./js/helloworld.js ./js/package.json [...] npm is .cmd file on Windows. Maybe this is issue. Looks like cmd.exe knows how to deal with them, while CreateProcess does not.
Re: Get program stats at run time
On Thursday, 30 June 2016 at 21:56:57 UTC, Special opOps wrote: How can I get the program stats at run time such as minimum and maximum amount of memory and cpu used, cpu architecture, os, etc? OS is compile-time constant. http://dlang.org/phobos/std_system.html#.os Or do you look for something like detecting that windows application is ran actually in wine on some other operating system? For memory and cpu usage detecting I wrote https://github.com/MyLittleRobo/resusage a while ago. Currently works only on Linux and Windows though.
Re: Recommended coding convention for combining unix and windows code ?
On Tuesday, 7 June 2016 at 15:33:57 UTC, chmike wrote:
Hello
I'm writing some code that I want to be portable across Posix
and Windows.
What is the recommended code convention for such type of code ?
80% of the class implementation is the same for both OS.
Should I write the following and copy past the 80%
version( Windows ) {
import core.sys.windows;
class MyInfo {...}
} else version( Posix ) {
import core.sys.posix;
class MyInfo {...}
} else {
static assert(false, "Unsupported platform");
}
or should I do it the C way with multiple embedded static if...
?
version( Windows ) {
import core.sys.windows;
} else { //Posix
import core.sys.posix;
}
class MyInfo {
...
static if(windows) {
enum Value {...}
} static else { //Posix
enum Value {...}
}
...
}
I think there's no need for copy-paste approach in user code when
the most parts are shared.
Copy-pasting would eventually make classes out of sync in terms
of function declarations (parameters, attributes) which in its
turn will lead to unexpected bugs and errors when compiling on
other platform.
Also copy-pasting of class would require to copy-paste
documentation comments and unittests, which is another PITA. You
can write declarations specifically for documentation comments,
but it means even more copy-pasting and can lead to the situation
where documentation is out of sync with actual declarations.
By the way phobos has example of copy-paste - DirEntry struct.
And its functions have different attributes across Windows and
Posix (e.g. const vs non-const) which really hurts cross-platform
programming.
Re: What's wrong with my usage of std.algorithm.map in this code example?
On Tuesday, 24 May 2016 at 20:03:14 UTC, pineapple wrote:
I would've expected this to work, but instead I get a compile
error. Is my syntax wrong? Is this just not a case that map can
handle, and I should be doing something else?
import std.algorithm : map;
import std.conv : to;
import std.stdio : writeln;
import std.string : join;
string test(Args...)(in Args items){
immutable string[items.length] itemstrings =
map!(to!string)(items);
return join(itemstrings, ", ");
}
unittest{
writeln(test(1, 2, 3, 4));
}
Works with 'only', 'array' and static array slicing.
import std.algorithm : map;
import std.range : only;
import std.conv : to;
import std.stdio : writeln;
import std.string : join;
import std.array : array;
string test(Args...)(in Args items){
immutable string[items.length] itemstrings =
map!(to!string)(only(items)).array;
return join(itemstrings[], ", ");
}
unittest{
writeln(test(1, 2, 3, 4));
}
Linking to library dependent on Objective-C functions
I have two files. The one has Objective-C functions and interfaces declarations written in D. Another file is main app and it imports the first and uses its functions. Imported file: http://codepad.org/jqdBb6sh Main file: http://codepad.org/0gKBqKxi When I compile them in one command it run without problems. dmd main.d domaindir.d -L-framework -LFoundation But I want domaindir.d to be static library and link main.d against this library. So I do: dmd -lib domaindir.d dmd main.d -I. -L-framework -LFoundation domaindir.a The second command prints warning: ld: warning: can't parse __DATA/__objc_imageinfo section in domaindir.a(domaindir_5_397.o) When I try to run ./main it fails: 2016-04-30 13:05:55.733 main[15762:685588] *** NSForwarding: warning: selector (0x1040f5e58) for message 'defaultManager' does not match selector known to Objective C runtime (0x7fff8aeed3af)-- abort 2016-04-30 13:05:55.734 main[15762:685588] +[NSFileManager defaultManager]: unrecognized selector sent to class 0x7fff7baaad28 2016-04-30 13:05:55.736 main[15762:685588] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '+[NSFileManager defaultManager]: unrecognized selector sent to class 0x7fff7baaad28' *** First throw call stack: ( 0 CoreFoundation 0x7fff95fab03c __exceptionPreprocess + 172 1 libobjc.A.dylib 0x7fff99ac176e objc_exception_throw + 43 2 CoreFoundation 0x7fff95fadfad +[NSObject(NSObject) doesNotRecognizeSelector:] + 205 3 CoreFoundation 0x7fff95ef3e24 ___forwarding___ + 1028 4 CoreFoundation 0x7fff95ef3998 _CF_forwarding_prep_0 + 120 5 main0x0001040baf58 D9domaindir9domainDirFNemmbZAya + 56 6 main0x0001040ba9cb _Dmain + 283 7 main0x0001040d515c D2rt6dmain211_d_run_mainUiPPaPUAAaZiZ6runAllMFZ9__lambda1MFZv + 40 8 main0x0001040d5090 D2rt6dmain211_d_run_mainUiPPaPUAAaZiZ7tryExecMFMDFZvZv + 36 9 main0x0001040d5101 D2rt6dmain211_d_run_mainUiPPaPUAAaZiZ6runAllMFZv + 45 10 main0x0001040d5090 D2rt6dmain211_d_run_mainUiPPaPUAAaZiZ7tryExecMFMDFZvZv + 36 11 main0x0001040d4ff6 _d_run_main + 498 12 main0x0001040baa80 main + 16 13 libdyld.dylib 0x7fff92ee25c9 start + 1 14 ??? 0x0001 0x0 + 1 ) libc++abi.dylib: terminating with uncaught exception of type NSException Abort trap: 6 Using dmd v2.071.0 on OS X 10.10.5
Re: "inline" conversion of array to immutable
On Friday, 22 April 2016 at 11:07:47 UTC, Jeff Thompson wrote:
On Friday, 22 April 2016 at 09:40:14 UTC, FreeSlave wrote:
On Friday, 22 April 2016 at 09:25:32 UTC, Jeff Thompson wrote:
Hello. The following code compiles OK where func creates a
mutable array and main assigns it to an immutable variable:
[...]
Probably this is what you look for
http://dlang.org/phobos/std_exception.html#.assumeUnique
OK, we lose the compiler check for correctness. What if I put
func directly in main with the hopes that the compiler will
check correctness and also inline the function? But it won't
assign to the immutable array. Why not? It's the same function.
void main(string[] args) {
int[] func(int x) pure {
int[] result = new int[10];
result[0] = x;
return result;
}
immutable int[] array = func(1);
}
Not sure why, but making func static fixes this:
void main(string[] args) {
static int[] func(int x) pure {
int[] result = new int[10];
result[0] = x;
return result;
}
immutable int[] array = func(1);
}
Re: "inline" conversion of array to immutable
On Friday, 22 April 2016 at 09:25:32 UTC, Jeff Thompson wrote: Hello. The following code compiles OK where func creates a mutable array and main assigns it to an immutable variable: [...] Probably this is what you look for http://dlang.org/phobos/std_exception.html#.assumeUnique
Is it legal to use std.windows modules?
std.windows.syserror and others have documentation comments, but they are not listed in online documentation on dlang.org. Is it ok to use functions and classes from this modules in D applications?
Re: Can D interface with Free Pascal?
On Thursday, 28 January 2016 at 04:26:26 UTC, Taylor Hillegeist wrote: Just curious... I had a thought that perhaps since Objective C was a replacement for Pascal on the mac. that they might have the same interface. but I'm not savvy enough with fpc to figure out how to try it. Not directly. You can declare cdecl function on Free Pascal side and call it as extern(C).
Re: Distribution of D apps
On Thursday, 21 January 2016 at 13:26:15 UTC, W.J. wrote: On Wednesday, 20 January 2016 at 16:01:11 UTC, Dibyendu Majumdar wrote: Hi, I am trying to understand the options for distributing a D app to users. My assumption is that only the shared libraries and binaries need to be distributed, and I need to include the D libraries. Is this correct? Thanks and Regards Dibyendu Hi, On Linux you can use 'ldd' to print shared library dependencies. On Windows you can use Dependency Walker. On Mac there's likely a similar program. Mind also that license terms for distributing libraries apply. OS X has otool -L Note that these tools don't show runtime dependencies. Many libraries can be loaded at runtime, especially when you use derelict-like modules. These libraries in their turn may depend on others, etc.
assumeSorted can't access private function when compiling with -debug
Here's code:
private {
import std.algorithm;
import std.range;
import std.typecons;
alias Tuple!(int, string) Data;
}
private bool myCmp(Data a, Data b) {
return a[0] < b[0];
}
auto bar() {
return [Data(1, "one"), Data(2, "two")].assumeSorted!myCmp;
}
void main()
{
bar();
}
Build it with -debug and without. It gives me error when building
with -debug.
/usr/include/dmd/phobos/std/algorithm/sorting.d(154): Error:
function sorttest.myCmp is not accessible from module sorting
Is it bug?
Re: Regression?
On Tuesday, 8 September 2015 at 04:04:16 UTC, Sebastiaan Koppe
wrote:
Fixed it by changing into:
```
import std.conv : text;
string json =
File("../languages.json","r").byLineCopy().joiner.text;
auto ls = json.parseJSON();
```
Why would you read file by line and then merge all into one
string? You end up with reading the whole file (well, getting rid
of line ends) anyway, so probably the more efficient solution
would be just read the whole file at once with std.file.read and
cast to string.
Using dub configurations with libraries
Let's say I have two dub packages: A and B. A is a library. B is library or application (does not matter) and depends on A. A has several configurations in dub.json. How to build the B package that way it will use non-default configuration of A?
Re: Are there any Phobos functions to check file permissions on Windows and Posix?
On Sunday, 6 September 2015 at 23:05:29 UTC, Jonathan M Davis wrote: http://dlang.org/phobos/std_file.html#.getAttributes will get you all of the file attributes for a file, though you'll have to look at the Windows and POSIX documentation to know how to interpret that. - Jonathan M Davis It will give you attributes from owner's point of view (i.e. what owner can, what users in the same group can, and what all other users can) Not sure if phobos has functions to check if file is readable or writable by current user. You can use access on Posix: http://linux.die.net/man/2/access
Re: Why ElementType!(char[3]) == dchar instead of char?
On Wednesday, 2 September 2015 at 05:00:42 UTC, drug wrote: 02.09.2015 00:08, Jonathan M Davis via Digitalmars-d-learn пишет: On Tuesday, September 01, 2015 20:05:18 drug via Digitalmars-d-learn wrote: My case is I don't know what type user will be using, because I write a library. What's the best way to process char[..] in this case? char[] should never be anything other than UTF-8. Similarly, wchar[] is UTF-16, and dchar[] is UTF-32. So, if you're getting something other than UTF-8, it should not be char[]. It should be something more like ubyte[]. If you want to operate on it as char[], you should convert it to UTF-8. std.encoding may or may not help with that. But pretty much everything in D - certainly in the standard library - assumes that char, wchar, and dchar are UTF-encoded, and the language spec basically defines them that way. Technically, you _can_ put other encodings in them, but it's just asking for trouble. - Jonathan M Davis I see, thanks. So I should always treat char[] as UTF in D itself, but because I need to pass char[], wchar[] or dchar[] to a C library I should treat it as not UTF but ubytes sequence or ushort or uint sequence - just to pass it correctly, right? You should just keep in mind that strings returned by Phobos are UTF encoded. Does your C library have UTF support? Is it relevant at all? Maybe it just treats char array as binary data. But if it does some non-trivial string and character manipulations or talks to file system, then it surely should expect strings in some specific encoding, and if it's not UTF, you should re-encode data before passing from D to this library. Also C does not have wchar and dchar, but has wchar_t which size is not fixed and depends on particular platform.
Re: Decrease number of front evaluations
On Wednesday, 26 August 2015 at 08:30:04 UTC, Yazan D wrote: On Wed, 26 Aug 2015 08:27:05 +, FreeSlave wrote: Are there ways to fix this? Should I consider writing my own range type probably? Check http://dlang.org/phobos/std_algorithm_iteration.html#.cache I tried it. It can help with map (still calls 2 times though) but the number of filter's predicate calls stay the same.
Decrease number of front evaluations
Example:
import std.stdio;
import std.algorithm;
import std.path;
import std.file;
import std.exception;
import std.getopt;
import std.array;
import std.range;
auto algo(string fileName, string[] dirs, string[] extensions)
{
return dirs.filter!(delegate(dir) {
bool ok;
collectException(dir.isDir, ok);
return ok;
}).map!(dir = extensions
.map!(delegate(ext) {
string path = buildPath(dir, fileName ~ ext);
writefln(Map: %s, path);
return path;
}).filter!(delegate(filePath) {
bool ok;
writefln(Check: %s, filePath);
collectException(filePath.isFile, ok);
return ok;
})
).joiner;
}
void main(string[] args)
{
string fileName;
string extensionsStr;
getopt(args,
fileName, file name to search without extension,
fileName,
extensions, list of extensions separated by ':',
extensionsStr
);
string[] dirs = args[1..$];
if (fileName.empty) {
stderr.writeln(File name not given);
return;
}
if (dirs.empty) {
dirs = [.];
}
string[] extensions = extensionsStr.splitter(':').array;
if (extensions.empty) {
extensions = [.d];
}
foreach(item; algo(fileName, dirs, extensions)) {
writefln(Found: %s, item);
}
}
When I run this it like this (assuming main.d exists):
main --fileName=main
It gives me:
Map: .\main.d
Check: .\main.d
Map: .\main.d
Check: .\main.d
Map: .\main.d
Check: .\main.d
Map: .\main.d
Found: .\main.d
In this simple example it calls map 4 times and filter 3 times.
The map transformer and filter predicate can be expensive, so I
would want to avoid redundant front evaluations.
The real code is more complicated and can be found here
https://github.com/MyLittleRobo/icontheme/blob/master/source/icontheme.d#L427
It can call filter's predicate with the same argument up to 8
times, which is not nice.
Are there ways to fix this? Should I consider writing my own
range type probably?
Re: A couple questions about a simple project
On Monday, 17 August 2015 at 15:05:56 UTC, Andre Polykanine wrote: Hi everyone, I'm new to D (I'm learning it by reading the great online book by Ali Çehreli - thank you very much for it, sir!), and, more than that, programming is my hobby, so please bear with me if I'm asking stupid questions. I've made a toy project which is a small command-line XML files validator: https://github.com/Oire/dxv/ and I have a couple questions about it: 1. I'm using std.getopt but don't know how to make it display a help message if no options are present at all: D:\repos\git\dxv\dxv.exe (nothing happens but I would like it to show the help as with --help switch) 2. As you can see, I check whether the file to validate can be read. I tried both `try...catch` and `enforce` (current version: `string s = enforce(cast(string)std.file.read(f), Unable to read file);` ), but this very exception for some reason can be caught only in `main()`. What am I missing? Thanks! 1. getopt modifies args array leaving not processed arguments in it, i.e. name of the program and positional arguments (those without leading - or --). If there're no command line arguments given, args array will contain the only one element - the name of executable. Therefore you can check for args.length == 1 after processing by getopt. 2. catch can handle only exception of type specified in its argument and derived. std.file.read throws FileException on fail, while you catch only CheckException. To cover all cases you can catch any exception by using Exception type (it's the base class for all exception classes), or write two catch-statements in a row for both FileException and CheckException. You don't need enforce here, unless you want to check if std.file.read returns null slice.
Re: How to provide this arg or functor for algorithm?
On Sunday, 16 August 2015 at 12:30:54 UTC, cym13 wrote:
On Sunday, 16 August 2015 at 11:53:42 UTC, FreeSlave wrote:
[...]
Ok, so as my lambda proposition obviously doesn't work, here is
one way that does using a templated function. There may be a
way to make it shorter, I don't know.
import std.conv;
import std.stdio;
template fun(uint context) {
static uint withContext(uint value) {
return value * context;
}
auto fun(uint[] arr) @nogc {
return arr.map!withContext;
}
}
void main(string[] args) {
[1, 2, 3].to!(uint[])
.fun!2
.writeln;
}
It works only because 2 is known constant at compile time.
How to provide this arg or functor for algorithm?
Let's say I want to map some range using some context.
The obvious way is to do:
uint[3] arr = [1,2,3];
uint context = 2;
auto r = arr[].map!(delegate(value) { return value * context; });
The problem is that this allocates delegate, so it can't be used
in @nogc code.
What I want to do might look like this:
static struct Caller
{
this(uint context) @nogc {
_context = context;
}
auto opCall(uint value) @nogc {
return value * _context;
}
uint _context;
}
auto caller = Caller(2);
auto r = arr[].map!(caller.opCall);
But it will not work of course since function must be a
compile-time parameter.
So the way to go would be:
auto caller = Caller(2);
auto r = arr[].map!(Caller.opCall)(caller);
But map and other algorithms don't support this interface.
The other way is
auto r = arr.map!(Caller(2));
But again, since it's template parameter, it can't use variables
unknown at compile time:
uint context = ...;
auto r = arr.map!(Caller(context)); //will not work
So what's the solution? Of course besides rewriting the whole
std.algorithm.
Re: How to provide this arg or functor for algorithm?
On Sunday, 16 August 2015 at 16:23:05 UTC, FreeSlave wrote:
On Sunday, 16 August 2015 at 15:29:10 UTC, Ali Çehreli wrote:
On 08/16/2015 04:53 AM, FreeSlave wrote:
The problem is that this allocates delegate, so it can't be
used in
@nogc code.
Would constructing the delegate by setting its .funcptr and
.ptr properties work in this case? You can have a pool of
context objects which become the context for the delegate.
http://ddili.org/ders/d.en/lambda.html#ix_lambda..funcptr
Ali
I don't see how this can solve the problem.
What I tried:
import std.stdio;
import std.range;
import std.algorithm;
struct Caller
{
this(uint context) {
_context = context;
}
uint method(uint value) {
return _context * value;
}
uint _context;
}
@nogc auto func(uint[] arr, uint function(uint) f)
{
return arr.map!(f);
}
void main(string[] args)
{
uint[] arr = [1,2,3];
uint context = 2;
auto c = Caller(context);
auto d = c.method;
writeln(func(arr, d.funcptr));
}
It still says it needs allocation:
test.d(17): Error: function test.func @nogc function allocates
a closure with the GC
funcptr does not play any role here, since passing the delegate
directly leads to the same error.
Forgot about data ptr.
@nogc auto func(uint[] arr, uint function(uint) f, void* data)
{
uint delegate(uint) d;
d.funcptr = f;
d.ptr = data;
return arr.map!(d);
}
void main(string[] args)
{
uint[] arr = [1,2,3];
uint context = 2;
auto c = Caller(context);
auto d = c.method;
writeln(func(arr, d.funcptr, d.ptr));
}
Still the same error though.
Re: How to provide this arg or functor for algorithm?
On Sunday, 16 August 2015 at 15:29:10 UTC, Ali Çehreli wrote:
On 08/16/2015 04:53 AM, FreeSlave wrote:
The problem is that this allocates delegate, so it can't be
used in
@nogc code.
Would constructing the delegate by setting its .funcptr and
.ptr properties work in this case? You can have a pool of
context objects which become the context for the delegate.
http://ddili.org/ders/d.en/lambda.html#ix_lambda..funcptr
Ali
I don't see how this can solve the problem.
What I tried:
import std.stdio;
import std.range;
import std.algorithm;
struct Caller
{
this(uint context) {
_context = context;
}
uint method(uint value) {
return _context * value;
}
uint _context;
}
@nogc auto func(uint[] arr, uint function(uint) f)
{
return arr.map!(f);
}
void main(string[] args)
{
uint[] arr = [1,2,3];
uint context = 2;
auto c = Caller(context);
auto d = c.method;
writeln(func(arr, d.funcptr));
}
It still says it needs allocation:
test.d(17): Error: function test.func @nogc function allocates a
closure with the GC
funcptr does not play any role here, since passing the delegate
directly leads to the same error.
Re: Environment variable for application storage under OSX ?
On Thursday, 16 July 2015 at 21:12:05 UTC, anonymous wrote:
I have the following code, working under Win and Linux:
---
import std.process: environment;
immutable string p;
static this() {
version(Win32) p = environment.get(APPDATA);
version(linux) p = /home/ ~ environment.get(USER);
version(OSX) p = ?;
}
---
what would be the OSX equivalent (to get the path where the
applications data are commonmly stored)?
Hello. You may take a look at this library
https://github.com/MyLittleRobo/standardpaths
OSX version uses Carbon though. You may want to use Cocoa API
(which is newer), but it's Objective-C.
Also you may consider standard path for data storage without
using any api or spec. It's usually $HOME/Library/Application
Support/ on OSX.
Re: Environment variable for application storage under OSX ?
On Friday, 17 July 2015 at 07:33:43 UTC, Anonymous wrote:
On Friday, 17 July 2015 at 07:14:24 UTC, FreeSlave wrote:
On Thursday, 16 July 2015 at 21:12:05 UTC, anonymous wrote:
I have the following code, working under Win and Linux:
---
import std.process: environment;
immutable string p;
static this() {
version(Win32) p = environment.get(APPDATA);
version(linux) p = /home/ ~ environment.get(USER);
version(OSX) p = ?;
}
---
what would be the OSX equivalent (to get the path where the
applications data are commonmly stored)?
Hello. You may take a look at this library
https://github.com/MyLittleRobo/standardpaths
OSX version uses Carbon though. You may want to use Cocoa API
(which is newer), but it's Objective-C.
Also you may consider standard path for data storage without
using any api or spec. It's usually $HOME/Library/Application
Support/ on OSX.
So for a software named 'SuperDownloader2015' it would be
$HOME/Library/Application Support/SuperDownloader2015
right ?
so it's not user-specific and it's writable for the current
user ?
sorry but it looks a bit strange, anyone can confirm ?
It is user specific obviously since it's in user home.
Can you elaborate on what do you want exactly?
From Windows and Linux examples you provided I assumed you need
user-specific paths (APPDATA is defined per user on Windows).
System-wide application data path is different.
Re: linking external libs
On Thursday, 2 July 2015 at 12:47:52 UTC, Nicholas Wilson wrote: On Thursday, 2 July 2015 at 12:19:06 UTC, Steven Schveighoffer wrote: On 7/2/15 8:10 AM, Nicholas Wilson wrote: [...] Try dmd -v, it will tell you the link line. Then you can try it yourself to see how to get it to work. I know dmd has problems with link line parameters, because it always puts Phobos somewhere. But this is generally for libraries that Phobos needs, not user code. A full example may be useful too. -Steve linker command is gcc test2.o -o test -m64 -L/usr/share/dmd/lib -L/usr/local/lib -lgmp -lphobos2 -L/Users/nicholaswilson/d/lib/ -lphobos2 -lpthread -lm Are you on OSX? (I consider it from /Users instead of /home) Try export LIBRARY_PATH=/usr/local/lib. Can you build C application linked to libgmp this way?
Re: Calling a cpp function from d
On Tuesday, 16 June 2015 at 12:26:45 UTC, C2D wrote:
Hi,
I encountered the following error:
Error: function files.SHGetFolderPath (void* hwndOwner, int
nFolder, void* hToken, uint dwFlags, char* pszPath) is not
callable using argument types (typeof(null), int, typeof(null),
int, immutable(char)*)
When I'm try to run this code:
...
{
import std.utf : toUTF8;
static string cache;
wchar[MAX_PATH + 2] buf;
BOOL result = SHGetFolderPath(null, 0x23, null, 0, cache.ptr);
return cache;
}
...
extern(Windows) HRESULT SHGetFolderPath(HWND hwndOwner, int
nFolder, HANDLE hToken, DWORD dwFlags, LPTSTR pszPath);
I tried everything I know about D and CPP. What can be the
solution?
I don't know what binding to shell32.dll you use. Probably you
need set -version=Unicode to compiler flags, so WinAPI aliases
refer to W variants of functions.
Personally I prefer to call explicitly W or A variants of WinAPI
functions.
Therefore declaration should look like this:
extern(Windows) HRESULT SHGetFolderPathW(HWND hwndOwner, int
nFolder, HANDLE hToken, DWORD dwFlags, wchar* pszPath)
Or even better
extern(Windows) @nogc @system HRESULT SHGetFolderPathW(HWND
hwndOwner, int nFolder, HANDLE hToken, DWORD dwFlags, wchar*
pszPath) nothrow
to allow using this function in %nogs nothrow code.
Also you may want to take a look at my library [1] where I use
SHGetSpecialFolderPath (I know, it's deprecated, but it still
works, so why not. I don't really need to bother with access
tokens here).
[1]
https://github.com/MyLittleRobo/standardpaths/blob/master/source/standardpaths.d#L299
Re: Calling a cpp function from d
On Tuesday, 16 June 2015 at 13:31:47 UTC, FreeSlave wrote: Also you may want to take a look at my library [1] where I use SHGetSpecialFolderPath (I know, it's deprecated, but it still works, so why not. I don't really need to bother with access tokens here). Note that I load shell32 dynamically, so no need to link it while building. Even if dmd links to shell32 by default, I'm not sure if this is true for gdc and ldc (never used them on win). At least, as I remember Mingw does not link to shell32 by default.
Re: What is a mutable method?
On Friday, 22 May 2015 at 12:12:46 UTC, tcak wrote: I know there is mutable variables, but what is a mutable method? Error message says mutable method project.mariadb.connector.ver2p1.resultset.ResultSetColumn.info is not callable using a const object. The method that can change the state of the object. This kind of error says that you try to call non-const method on const object, which is prohibited. You can call only the methods marked as const on the const object.
Re: Linking C++ standard library works with GDC... but not DMD. (Linux)
On Thursday, 16 April 2015 at 08:51:15 UTC, TheGag96 wrote: Hi, I've got this project that requires me to link into a C++ backend. It works just fine when using GDC: gdc *.d [client libraries] However, this command using DMD does not work: dmd -L-lstdc++ *.d [client libraries] I still get errors involving the standard library not being added like: /usr/include/c++/4.8/iostream:74: undefine reference to `std::ios_base::Init::Init()' (etc.) What do I need to do to make this work? Thanks. Can't get to linux machine now, but you can try place -L-lstdc++ after source files.
Re: stdout redirect
On Sunday, 12 April 2015 at 04:39:06 UTC, Philip Stuckey wrote: why not: import std.stdio; stdout = File(args[4], w+); stderr = File(args[4], w+); It just replaces the object, not redirects output. E.g. if you use printf somewhere it will use stdout, not file.
Re: Binary search in structs
I think I found solution using opBinaryRight
import std.range;
struct S
{
int i;
string s;
int opCmp(int i) {
return this.i - i;
}
int opCmp(ref const S s) {
return this.i - s.i;
}
int opBinaryRight(string op)(int i) if (op == ) {
return i - this.i;
}
}
void main(string [] args)
{
S[] structs = [{1,hello}, {2,world}, {3, !}]; //sorted
by i
auto sortedRange = assumeSorted(structs);
auto t = sortedRange.trisect(2);
}
Binary search in structs
I have array of structs sorted by specific field. How can I
perform binary search using this field as a key?
Currently I ended up with this, but it gives error:
struct S
{
int i;
string s;
}
import std.range;
void main(string [] args)
{
S[] structs = [{1,hello}, {2,world}, {3, !}]; //sorted
by i
auto sortedRange = assumeSorted!(function bool(ref const S
item, int needle) {
return item.i needle;
})(structs);
sortedRange.trisect(2); //compilation error
}
Re: Binary search in structs
On Sunday, 5 April 2015 at 23:15:04 UTC, w0rp wrote:
On Sunday, 5 April 2015 at 23:06:27 UTC, FreeSlave wrote:
I have array of structs sorted by specific field. How can I
perform binary search using this field as a key?
Currently I ended up with this, but it gives error:
struct S
{
int i;
string s;
}
import std.range;
void main(string [] args)
{
S[] structs = [{1,hello}, {2,world}, {3, !}];
//sorted by i
auto sortedRange = assumeSorted!(function bool(ref const S
item, int needle) {
return item.i needle;
})(structs);
sortedRange.trisect(2); //compilation error
}
I believe you have to pass trisect a value of S. So S(2, )
would do here, I suppose.
Of course I could pass dummy object, but this is ugly solution. I
hoped there's some better one.
Re: Loading Symbols from Loaded Libraries
On Monday, 1 September 2014 at 13:31:32 UTC, Matt wrote: If I were to use Runtime.loadLibrary(), it claims to merge any D GC in the shared lib with the current process' GC. Do I need to version away symbol loading code for each platform? Or is there already code in Phobos that allows us to do this independent of platform? There was high level Library wrapper by Martin Nowak ( https://github.com/MartinNowak/druntime/commit/f8f512edea2370759ab75703dceece5e069645be ), but it seems it was not added to main dmd repository. So you should use dlsym / GetProcAddress. Use core.demangle.mangle to get mangled names of D functions. I also made some similar wrapper in my project https://bitbucket.org/FreeSlave/dido But it was not updated for a long time and now it's outdated (code uses dlopen and LoadLibrary which is wrong and should be changed to Runtime.loadLibrary. Same for dlclose and FreeLibrary)
Re: struct or class
On Sunday, 24 August 2014 at 11:56:44 UTC, nikki wrote:
I come from languages that don't offer structs, I have this
json load function that has to keep some data and intuitively
I've written a struct, I've read about the differences, heap vs
stack, value vs reference, but know I think i am overthinking
it.
Is this decent:
bool loadFromFile (string path)
{
auto data = readText(path);
JSONValue parsed = parseJSON(data);
struct AtlasSpriteData
{
SDL_Rect clipRectangle;
int xOffset;
int yOffset;
}
AtlasSpriteData[string] dict;
foreach( string name, value; parsed[frames] ){
SDL_Rect clipRectangle;
auto spriteSourceSize =
value[spriteSourceSize];
clipRectangle.x = to!int(frame[x].toString());
clipRectangle.y = to!int(frame[y].toString());
clipRectangle.w = to!int(frame[w].toString());
clipRectangle.h = to!int(frame[h].toString());
int xOffset = to!int(spriteSourceSize[x].toString());
int yOffset = to!int(spriteSourceSize[y].toString());
auto data = AtlasSpriteData(clipRectangle, xOffset,
yOffset);
dict[name] = data;
}
Or should I use a class for that AtlasSpriteData?
reading about it I get the impression everytime I'll look up
data from that dictionary data will get copied ?
Your struct instance will occupy only 24 bytes. It's ok even if
you will copy it. I would avoid heap allocation in this case.
Also what is 'frame' variable? I don't see local declaration of
it. Or you just forgot to replace 'value' with 'frame'. Does not
JSONValue.integer fit in this case instead of
to!int(JSONValue.toString()) ?
Reading does not perform copy if you access struct directly as
dict[name].some_field. Copying is performed only if you pass
struct by value or assign it to variable.
Re: Crash writing and reading back class instance address to void*
On Monday, 18 August 2014 at 10:07:30 UTC, Remi Thebault wrote:
Hi
Starting to use GtkD TreeModel, I write an instance of an
abstract class to TreeIter.userData.
When reading back the void pointer and casting to my abstract
class leads to crash when instance is used (Task is the
abstract class):
int fillIter(TreeIter iter, Task t)
{
if (!t || !iter) return 0;
iter.stamp = stamp_;
writeln(writing , cast(void*)t);
iter.userData = cast(void*)t;
return 1;
}
Task taskFromIter(TreeIter iter)
{
if (!iter || iter.stamp != stamp_) return null;
writeln(reading , iter.userData);
writeln(cast(Task)iter.userData);
return cast(Task)iter.userData;
}
the code prints
writing 18FC98
reading 18FC98
and crashes at the 2nd writeln call in taskFromIter function
with message object.Error@(0): Access violation
The instance is referenced somewhere else in the model, so it
should not get garbage collected. should I check this anyway?
Any idea?
thanks
Rémi
Classes are reference types. You take reference of local
reference (it's address on stack). Use just cast(void*)t
Re: extern (c++) std::function?
On Friday, 15 August 2014 at 03:10:43 UTC, Etienne Cimon wrote: I'm looking into making a binding for the C++ API called Botan, and the constructors in it take a std::function. I'm wondering if there's a D equivalent for this binding to work out, or if I have to make a C++ wrapper as well? There are some restrictions about sharing complex types between C++ and D. Currently only POD-structs and classes with virtual functions are supported for transparent interaction. In this case things become even more complicated since std::function is template class and D can't instantiate C++ templates. You should stick with some predefined signatures and make wrappers on C++ side, which will accept 'plane' functions and construct std::function.
Re: pointer array?
On Wednesday, 30 July 2014 at 20:51:25 UTC, Daniel Kozak via Digitalmars-d-learn wrote: V Wed, 30 Jul 2014 14:33:51 + seany via Digitalmars-d-learn digitalmars-d-learn@puremagic.com napsáno: In Ali's excllent book, somehow one thing has escaped my attention, and that it the mentioning of pointer arrays. Can pointers of any type of pointed variable be inserted in an int array? Using to!(int) perhaps? If not directly, then what else would achieve the same effect? It depends on pointer size, for eg, on 64bit system with 64bit pointers something like this should works: long[] arr = (cast(long*)pointersArray.ptr)[0 .. pointersArray.length]; or long[] arr = cast(long[])pointersArray; // but I am not sure if this is OK Don't use long in this case, use size_t and ptrdiff_t. They are required to be integer types with size of pointer (size_t is unsigned, ptrdiff_t is signed)
Re: Split class declaration and definition
On Thursday, 31 July 2014 at 11:34:38 UTC, Kozzi11 wrote:
Is possible to somehow split class declaration and definition.
I mean something like this:
class C
{
void hello(); // just prototype
}
class C
{
void hello()
{
//actual code
}
}
or something like this
void C.hello() {
//actual code
}
dmd -c -o- -H yourmodule.d
will create .di file (i.e. interface)
Re: Get the default hash function.
On Thursday, 31 July 2014 at 12:05:53 UTC, francesco cattoglio
wrote:
Really simple question:
how do I get the compiler-generated hash function for a given
type?
For example:
Struct S
{
int i;
}
can be used in an associative array. That means the compiler
generates a toHash function. Is there any simple way to call
it directly?
I believe you may use typeid to get TypeInfo instance. It has
getHash method - http://dlang.org/phobos/object.html#.TypeInfo
Re: Grabing C(++) stdout
On Wednesday, 23 July 2014 at 15:35:59 UTC, Chris wrote: The C++ code does this: size_t fwrite ( const void * ptr, size_t size, size_t count, FILE * stream ); // stream is stdout and text appears in the console (a string). I don't how to grab the text that is written to console. I might have to redirect it from within the C++ code. I've created simple example (for Linux) - https://bitbucket.org/FreeSlave/redirect-example/src It works as expected. Nothing writes to console, but to file.
Re: fork/waitpid and std.concurrency.spawn
On Tuesday, 22 July 2014 at 07:58:50 UTC, Puming wrote: Is there a fork()/wait() API similar to std.concurrency spawn()? The best thing I've got so far is module core.sys.posix.unistd.fork(), but it seems to only work in posix. Is there a unified API for process level concurrency? ideally with actor and send message support too. You need std.process.
Re: How to know whether a file's encoding is ansi or utf8?
Note that BOMs are optional and may be not presented in Unicode file. Also presence of leading bytes which look BOM does not necessarily mean that file is encoded in some kind of Unicode.
Re: fork/waitpid and std.concurrency.spawn
On Tuesday, 22 July 2014 at 14:26:05 UTC, Puming wrote: I've only found spawnProcess/spawnShell and the like, which executes a new command, but not a function pointer, like fork() and std.concurrency.spawn does. What is the function that does what I describe? On Tuesday, 22 July 2014 at 10:43:58 UTC, FreeSlave wrote: On Tuesday, 22 July 2014 at 07:58:50 UTC, Puming wrote: Is there a fork()/wait() API similar to std.concurrency spawn()? The best thing I've got so far is module core.sys.posix.unistd.fork(), but it seems to only work in posix. Is there a unified API for process level concurrency? ideally with actor and send message support too. You need std.process. I'm not sure what you're trying to do. Posix fork does not just spawn function, it spawns new process as copy of its parent and continue execution from the point where fork returns. Windows creates processes in some different way, and it seems there is no function with same functionality as Posix fork in WinAPI (by the way you can try to find some implementations on the Internet / use Cygwin / try to use Microsoft Posix Subsystem). I think the reason why phobos does not have functionality you want is that standard library should be platform-agnostic. So instead of emulating things which are not supported by some platform, it just truncates them.
Re: DUB help plz
Derelict contains bindings to other libraries, not these libraries themselves. dub downloads only these bindings, not original libraries (since they are written in C, not D, and not included in dub repositories). You should manually get necessary libraries and put them in folder where .exe will be placed or in some path from PATH environment variable, so application would be able to find them at runtime.
Re: close program by code
On Thursday, 26 June 2014 at 09:05:23 UTC, pgtkda wrote:
How can i close my application by code?
Do you mean exit status? Just call exit function from C library.
import std.c.stdlib;
void main()
{
exit(0);
}
Re: close program by code
On Thursday, 26 June 2014 at 11:07:37 UTC, Rene Zwanenburg wrote:
On Thursday, 26 June 2014 at 10:40:00 UTC, John Colvin wrote:
On Thursday, 26 June 2014 at 09:58:50 UTC, FreeSlave wrote:
On Thursday, 26 June 2014 at 09:05:23 UTC, pgtkda wrote:
How can i close my application by code?
Do you mean exit status? Just call exit function from C
library.
import std.c.stdlib;
void main()
{
exit(0);
}
Will destructors and/or scope statements be executed if you
exit this way?
They won't. Same for module destructors.
Module destructors are called. At least in DMD v2.065. I believe
d runtime automatically register this with atexit function.
Re: Passing around a list of differently typed functions
On Monday, 23 June 2014 at 01:16:49 UTC, Evan Davis wrote: As the subject says, I would like to pass around an array of functions. The trick is, that the functions have different type signatures. Is there a way to put the two functions int foo(int a, int b); bool bar(bool a, bool b); into one array, that I can pass around and cast as necessary? Thanks, Evan You can pass them as pointers, for example cast to void*. But you still need correct signature to cast pointer to actual type before call function.
dub --annotate option
Dub has option called --annotate. It's described like this: Do not perform any action, just print what would be done I supposed it's something similar to -n option of Jam build system (I really like this feature). But dub's annotate prints nothing. So what is that? I have DUB version 0.9.21
Re: Subclass of Exception
I don't think you always need documentation for all exception classes, since the most of them have the same interface. Usually it's worth to describe where is some exception able to be thrown from, not exception itself. And it's covered by function documentation, not by documentation of exception class. If you need to just mention exception class in documentation then my method is way to go, because you can document alias declaration, and mention that it has same interface as Exception (not difficult to remember).
Re: Subclass of Exception
On Saturday, 14 June 2014 at 11:59:53 UTC, Paul wrote:
One stupid question: in Python subclassing of Exception looks
like:
class MyError(Exception): pass
but in D, if I'm right, we should write more code:
class MyError : Exception {
this(string msg) { super(msg); }
}
(without constructor we get error: ...Cannot implicitly
generate a default ctor when base class BASECLASS is missing
a default ctor...)
Is any shorter D way?
In this regard D is same as C++. When you create derived class,
you need to define constructors, even if all they do is passing
arguments to base class' constructor. It's really annoying,
especially when base class has many constructors.
But in D you can apply some template magic to automate this
process for exceptions.
Example:
import std.stdio;
template TemplateException(T)
{
class TemplateException : Exception
{
public:
this(string msg, string file = __FILE__, size_t line =
__LINE__, Throwable next = null) {
super(msg, file, line, next);
}
}
}
void throwException(Exception ex)
{
try {
throw ex;
}
catch(TemplateException!int e) {
writeln(int);
}
catch(TemplateException!double e) {
writeln(double);
}
catch(TemplateException!string e) {
writeln(string);
}
}
int main()
{
auto intEx = new TemplateException!int(int error);
auto doubleEx = new TemplateException!double(double error);
auto stringEx = new TemplateException!string(string error);
throwException(intEx);
throwException(doubleEx);
throwException(stringEx);
return 0;
}
You also can tempalte with string literals instead of types to
gain more flexibility and use alias statement to provide
convenient names.
Re: crt1.o: could not read symbols: Bad value
It seems like you're trying to compile 64-bit code when you are on 32-bit system and you have 32-bit libphobos.
Re: crt1.o: could not read symbols: Bad value
I conclude that because I have similar errors when trying to build 64-bit library on 32-bit system. /usr/bin/ld: /usr/lib/x86_64-linux-gnu/libphobos2.a(format_712_5b3.o): relocation R_X86_64_32 against `.rodata' can not be used when making a shared object; recompile with -fPIC /usr/lib/x86_64-linux-gnu/libphobos2.a: error adding symbols: Bad value collect2: error: ld returned 1 exit status --- errorlevel 1 But paths in your error log look like you're on x64, so it's probably not the case.
Re: crt1.o: could not read symbols: Bad value
dmd has -shared option. Try it instead of -L-shared.
Re: Can't link libs?
On Friday, 6 June 2014 at 16:33:27 UTC, Adam D. Ruppe wrote: When you compile the final program, the library .d file needs to be available too, either in the folder based on its name or passed straight to dmd explicitly. Despite the presence of the .lib file, the .d file is still needed so it can get code prototypes and type names, etc., out of it. (If you have the .d though, the lib is rarely needed. Indeed, the way I do most D libraries is to just pass all the .d files to the compiler at once and forget about lib files.) You are not ought to have .d files to link with library, because to link you need only interfaces, not implementation (except for templates, since they are not included in object files), otherwise there would be impossible to create closed-source developer libraries. You can generate .di files with dmd -c -o- -H option and use them.
Re: why can't I call const methods on shared objects?
On Sunday, 11 May 2014 at 07:31:10 UTC, FreeSlave wrote:
On Friday, 9 May 2014 at 21:42:14 UTC, Vlad Levenfeld wrote:
Is this still the case if the method is const or pure?
Const methods still require synchronization, because other
threads may change some data, needed by const method while
method is executed, and then you may get wrong results.
Consider:
class Point
{
public:
float x;
float y;
}
I send before I end(
class Point
{
public:
float x;
float y;
Tuple!(float, float) getLengthAndAngle() const
{
float l = sqrt(x*x+y*y);
//other thread change x or y
float a = atan2(x, y);
return tuple(l, a);
}
}
Re: why can't I call const methods on shared objects?
On Friday, 9 May 2014 at 21:42:14 UTC, Vlad Levenfeld wrote:
Is this still the case if the method is const or pure?
Const methods still require synchronization, because other
threads may change some data, needed by const method while method
is executed, and then you may get wrong results.
Consider:
class Point
{
public:
float x;
float y;
}
Re: Configuring Phobos from the 1-click installer
On Sunday, 11 May 2014 at 05:34:38 UTC, Moses wrote: On Sunday, 11 May 2014 at 04:33:24 UTC, Ali Çehreli wrote: On 05/10/2014 07:12 PM, Moses wrote: After using the 1-click Ubuntu installer, I'm having trouble figuring out how to import standard library functions for Phobos. I get the message: Error: module io is in file 'std/std/io.d' which cannot be read Judging from the repeated stds up there I think you put a dot before io: import std.std.io; // -- WRONG The second dot should not be there. Do this instead: import std.stdio; // -- correct Ali Thanks, I also found that I need to include the flag -I/usr/include/dmd/phobos to get it to compile. I tried doing: export PATH=$PATH:/usr/include/dmd/phobos but apparently I still need the -I flag. Is there another way to get around this? Does your /etc directory contain dmd.conf file? You can add standard flags there Example of dmd.conf: [Environment] DFLAGS=-I/usr/include/dmd/phobos -I/usr/include/dmd/druntime/import
Re: Temporary silence output (stdout)
On Saturday, 10 May 2014 at 20:24:50 UTC, MarisaLovesUsAll wrote:
Hi!
I sometimes got a useless messages in stdout from SDL_Image
library, and I want to temporary silence it. How do I do?
You can temporary redirect output to file. Example (on C):
#include stdio.h
#include unistd.h
#include fcntl.h
int main ()
{
int stdout_copy = dup(STDOUT_FILENO);
close (STDOUT_FILENO);
int stdout_file = creat(myfile.txt, O_RDWR); //it obtains
the lowest free descriptor - 1, i.e. stdout.
printf(Hello file\n);
fflush(stdout); //don't forget to flush
close(stdout_file);
dup2(stdout_copy, STDOUT_FILENO);
printf(Hello console\n);
return 0;
}
But it's not very portable, you probably will need to write
something other for Windows system. And there are no checks for
errors in this example.
Also in SDL specific case it seems like it should redirect by
default - http://sdl.beuc.net/sdl.wiki/FAQ_Console but I don't
know whether it's true or not for SDL_Image.
Re: Messy code in console
On Sunday, 11 May 2014 at 07:43:07 UTC, Kagamin wrote: Known bug https://issues.dlang.org/show_bug.cgi?id=2742 It's not bug. Write-functions are designed to output text to stdout, and it's issue of programmer to make sure that expected acceptor can interpret them properly. Note that stdout may be redirected to file or be part of pipe, that does nothing with cmd console.
Re: Get and set terminal size
What are compiler and platform do you use? Probably you are trying to link with 64-bit library while being on 32-bit OS (or vice versa) It works fine on my 32-bit Debian with ldc2 and dmd.
