weird formattedRead
Hello, I have some doubts about working `formattedRead` with
space chars.
Example:
```d
import std : formattedRead, DateTime, stderr, each;
DateTime parseDT(string str)
{
int d,mo,y, h,m,s;
formattedRead!"%d/%d/%d %d:%d:%d"(str, d,mo,y, h,m,s);
return DateTime(y,mo,d, h,m,s);
}
void tryParse(string s)
{
try
{
auto dt = parseDT(s);
stderr.writefln!"valid '%s': %s"(s, dt);
}
catch (Exception e)
stderr.writefln!"INVALID '%s': %s"(s, e.msg);
}
void main()
{
auto vs = [
"",
"1",
"1/1",
"1/1/1",
"1/1/1 1",
"1/1/1 1:1",
"1/1/1 1:1:1",
];
vs.each!tryParse;
}
```
outputs:
```
INVALID '': 0 is not a valid month of the year.
INVALID '1': parseToFormatSpec: Cannot find character '/' in the
input string.
INVALID '1/1': parseToFormatSpec: Cannot find character '/' in
the input string.
valid '1/1/1': 0001-Jan-01 00:00:00 <<< see here
INVALID '1/1/1 1': parseToFormatSpec: Cannot find character ':'
in the input string.
INVALID '1/1/1 1:1': parseToFormatSpec: Cannot find character ':'
in the input string.
valid '1/1/1 1:1:1': 0001-Jan-01 01:01:01
```
Is space a special char for `formattedRead` and it simple stop
parse without throwing exception if not found space (that
represented in fmt string)?
Have `formattedRead` any other special chars?
Or it's bug?
Re: isPOD is broken?
On Friday, 26 March 2021 at 12:13:29 UTC, kinke wrote: A class *reference* is always a POD. Only structs can be non-PODs. In this case what means "does not have virtual functions, does not inherit"? Structs doesn't have virtual methods and they can't inherits.
isPOD is broken?
Hi all!
class Foo
{
private int val;
this(int v) { val = v; }
int vv() { return val*2; }
~this() { }
}
class Bar : Foo
{
this(int v) { super(v); }
override int vv() { return val*3; }
}
pragma(msg, __traits(isPOD, Foo));
pragma(msg, __traits(isPOD, Bar));
prints
true
true
example1
https://run.dlang.io/is/Fvru18
example2
https://run.dlang.io/is/GrXdGy
May be POD is not what I mean? Bad docs?
https://dlang.org/glossary.html#pod
Re: Truly algebraic Variant and Nullable
On Sunday, 20 December 2020 at 11:00:05 UTC, Tobias Pankrath wrote: On Sunday, 15 November 2020 at 04:54:19 UTC, 9il wrote: Truly algebraic Variant and Nullable with an order-independent list of types. Thanks for sharing it! Could you give a (very short) explanation on why sumtype could not meet your requirements? I am just starting a new D project and have to choose between sumtype and your solution. The work has been sponsored by Kaleidic Associates and Symmetry Investments. Much appreciated! For me choose between sumtype and mir.algebraic ends when I not found any solution for working with type kind [1] in sumtype. Kind represents in taggedalgebraic [2] too, but it can't work in compile time (important for me in current project). Also I find tagged_union [3] library, but it haven't any visit [4] or match functions. [1] http://mir-core.libmir.org/mir_algebraic.html#.TaggedVariant [2] https://code.dlang.org/packages/taggedalgebraic [3] https://code.dlang.org/packages/tagged_union [4] http://mir-core.libmir.org/mir_algebraic.html#visit
Re: Truly algebraic Variant and Nullable
On Wednesday, 16 December 2020 at 15:58:21 UTC, 9il wrote:
On Wednesday, 16 December 2020 at 14:54:26 UTC, Oleg B wrote:
On Sunday, 15 November 2020 at 04:54:19 UTC, 9il wrote:
Truly algebraic Variant and Nullable with an
order-independent list of types.
Nullable is defined as
```
alias Nullable(T...) = Variant!(typeof(null), T);
```
Variant and Nullable with zero types are allowed.
`void` type is supported.
Visitors are allowed to return different types.
Cyclic referencing between different variant types are
supported.
More features and API:
http://mir-core.libmir.org/mir_algebraic.html
Cheers,
Ilya
The work has been sponsored by Kaleidic Associates and
Symmetry Investments.
Great library! Have you any plan to separate it from mir-core
(to mir-algebraic for example)?
Thanks! Maybe, but mir-core is quite small itself and
mir.algebraic is the only part that would be extended or
updated in the near future. Other parts are quite stable. If
there would be a strong reason to split it, we can do it.
That are you planing update? It's will be perfect if you add
`get` overload for kind type and more work with tags [2]
like that:
```
alias TUnion = Algebraic!(
TaggedType!(int, "count"),
TaggedType!(string, "str")
);
auto v = TUnion("hello");
S: final switch (v.kind)
{
static foreach (i, k; EnumMembers!(k.Kind))
case k:
someFunction(v.get!k); // [1] by now
v.get!(TUnion.AllowedTypes[i])
break S;
}
if (v.is_count) // [2]
writeln(v.count);
```
or may be I miss this feature in docs?
Re: Truly algebraic Variant and Nullable
On Sunday, 15 November 2020 at 04:54:19 UTC, 9il wrote: Truly algebraic Variant and Nullable with an order-independent list of types. Nullable is defined as ``` alias Nullable(T...) = Variant!(typeof(null), T); ``` Variant and Nullable with zero types are allowed. `void` type is supported. Visitors are allowed to return different types. Cyclic referencing between different variant types are supported. More features and API: http://mir-core.libmir.org/mir_algebraic.html Cheers, Ilya The work has been sponsored by Kaleidic Associates and Symmetry Investments. Great library! Have you any plan to separate it from mir-core (to mir-algebraic for example)?
Re: How to define delegate what returns ref?
On Friday, 28 August 2020 at 11:50:35 UTC, kinke wrote: On Friday, 28 August 2020 at 11:46:15 UTC, Oleg B wrote: How to do this more clearly? alias Dg = ref int delegate(); Dg foo; Thanks!
How to define delegate what returns ref?
Hello all!
syntax
ref int delegate() foo0;
or
ref(int) delegate() foo1;
or
int delegate() ref foo2;
are not valid.
if I try alias
alias refint = ref int;
refint delegate() foo3;
foo3 have type `int delegate()` (without `ref`)
and it can't store delegate from object method that have `int
delegate() ref` (that can be printed if we use
`typeof().stringof`)
I found only one ugly way to do this
interface Foo { ref int func(); }
typeof() foo4;
How to do this more clearly?
Re: Overload comparison operators for "nullable" types
On Thursday, 30 July 2020 at 14:52:17 UTC, H. S. Teoh wrote: On Thu, Jul 30, 2020 at 01:41:05PM +, Oleg B via Digitalmars-d-learn wrote: [...] Logically we can compare versions, but what must return `opCmp` if one of versions has 'not comparible' state? [...] opCmp is allowed to return float; so you could return float.nan in this case. T Thank you! Simple answer but not in documentation...
Overload comparison operators for "nullable" types
Hello!
For example we can imagine struct Version.
Version can be old or new and can be 'badly formed' or
'undefined' or other 'not comparible' ('uncompatible') state.
Logically we can compare versions, but what must return `opCmp`
if one of versions has 'not comparible' state?
I think strategy of throwing exception in `opCmp` is bad because
some types can be 'not comparible' not because they is `null` or
`undefined`, 'not comparible' can be two objects in some working
states.
If we add `opEquals` we can check 'not comparible' and return
`false`, but operators `a <= b` and `a >= b` not expands under
the hood as `a < b || a == b`, they only call `opCmp` and if it
returns 0 considered arguments are equals.
Rewrite `a <= b` as `a < b || a == b` is not intuitive and can
get bugs if new user will use code (or old user forgot about
this). Checking 'not comparible' state before `a <= b` is not
intuitive too.
`opBinary` can't overload comparison.
We have same type of problem if wrap simple `double` into struct
and try overload comparison (double.nan has own behavior).
Problem can be solved if we add new `opCmpEx` into language spec
that return 4 states: more, less, equal, not equal.
Or if we allow `opBinary` overload comparisons.
May be I don't understand something important and this problem is
not exists?
May be in cases where can be 'not comparible' state we should not
use overload of comparison operators? But it looks like
overloading conception isn't completed and can be improved.
aslike: duck-typing with check interface
Hello! I wrote library, that can be helpful in some cases: 1. easy and readable check interface of structures without 'templatisation' of function or method 2. cache virtual methods table lookup for OOP implementations using: 1. define interface 2. use `Like` wrap as argument 3. wrap objects by `as` function example: https://github.com/deviator/aslike/blob/master/example/struct/app.d https://github.com/deviator/aslike/blob/master/example/cache/app.d in cache example at my machine I have ~2 increase of performance: ``` $ ldc2 -O -I../../source/ app.d; and rm app.o; and ./app delegates avg: [18 ms, 281 μs, and 7 hnsecs] impliface avg: [36 ms, 70 μs, and 3 hnsecs] likecache avg: [18 ms and 243 μs] ``` dub: https://code.dlang.org/packages/aslike git: https://github.com/deviator/aslike
Re: gtkui: aux lib for using gtkd with glade
On Wednesday, 12 February 2020 at 14:12:29 UTC, Ferhat Kurtulmuş wrote: On Tuesday, 11 February 2020 at 18:40:33 UTC, Oleg B wrote: If you want use Glade [1] as UI builder with gtkd [2] you can be interested by this library [Dub] http://code.dlang.org/packages/gtkui [Git] https://github.com/deviator/gtkui [1] https://glade.gnome.org/ [2] https://gtkd.org/ Very good. I wish attribute names would follow Vala's rules as much as it could be so that possible transitions from vala-gtk users can feel home. But this is my personal choice though: eg. gtkwidget -> GtkChild Good idea, thanks! But I think it should follow d-style for UDA https://dlang.org/dstyle.html#naming_udas and should be camelCase or fully lowercase like @nogc. I will add @gtkchild and @gtkcallback in next version and add deprecate message for @gtkwidget and @gtksignal.
gtkui: aux lib for using gtkd with glade
If you want use Glade [1] as UI builder with gtkd [2] you can be interested by this library [Dub] http://code.dlang.org/packages/gtkui [Git] https://github.com/deviator/gtkui [1] https://glade.gnome.org/ [2] https://gtkd.org/
Re: ssll - simple shared library loader
On Monday, 6 January 2020 at 10:04:38 UTC, Sönke Ludwig wrote: I've written something similar with the goal to make it work transparently with existing static bindings: https://code.dlang.org/packages/dynamic It uses a mixin to specify the module(s) containing the declarations instead of a UDA Interesting solution. Do you plain implement betterC compatible?
Re: ssll - simple shared library loader
On Monday, 6 January 2020 at 04:32:25 UTC, Mike Parker wrote: On Sunday, 5 January 2020 at 23:23:48 UTC, Oleg B wrote: Nice work! One thing I would recommend, though, is that you not bake in extern(C). Some libraries require extern(System) (because they're stdcall on Windows and cdecl everywhere else). So to be robust, you'll want to implement support for both into SSLL. Thanks for the advice! I will continue work on ssll and will try implement this feature. There are only two declarations required for the dynamic bindings in BindBC: an alias and a pointer. And of course the loader is separate. The reason is historical. When I was working on the earliest version of Derelict back in 2004, we didn't have all the fancy compile-time features we have now. I (and a couple of contributors) tried doing it by declaring the function pointers without aliases, but we ran into a couple of issues and settled for taking the alias + pointer approach. (It's been so long that I can't recall what the issues were). Thanks for the clarification and thanks for Derelict bindings!
ssll - simple shared library loader
It's analog of bindbc, but without need write boilerplate code. May be bindbc is designed for another cases, but I don't understand need writing triple definition for one function (pointer, loading, wrap-function). ssll betterC compatible too, and tested on windows (x86) and linux (x86, ARM). package: http://code.dlang.org/packages/ssll github: https://github.com/deviator/ssll Example usage: Mosquitto binding and wrapper https://github.com/deviator/mosquittod/blob/master/source/mosquittod/api/load.d libsystemd binding https://github.com/deviator/sdutil/blob/master/source/systemd/daemon.d I think somebody can find it handy.
must scope for delegates restrict compilation?
Hello all I think this code must get compilation error, but it didn't, furthermore result program get UB. https://run.dlang.io/is/Qpr278 Is this correct behavior and why?
Re: Cross-compiling dub projects with LDC
Is this supports only in dub-1.17.0-beta.2 and it's not include to ldc2-1.17.0? It feature only in dub-master by now But it's cool works) Thanks!
Re: Cross-compiling dub projects with LDC
On Sunday, 25 August 2019 at 21:16:22 UTC, kinke wrote: The resulting cctest.exe (incl. 2 DLLs) can be copied to a Win64 box and then runs fine, as long as a Visual C++ runtime ≥ 2015 is installed. Tested on a Linux host, but should work on any host. Is this supports only in dub-1.17.0-beta.2 and it's not include to ldc2-1.17.0?
Re: Is betterC affect to compile time?
On Thursday, 25 July 2019 at 12:34:15 UTC, rikki cattermole wrote: Those restrictions don't stop at runtime. It's vary sad. What reason for such restrictions? It's fundamental idea or temporary implementation?
Re: Is betterC affect to compile time?
On Thursday, 25 July 2019 at 12:20:04 UTC, Mike Franklin wrote: If you read the documentation for betterC (https://dlang.org/spec/betterc.html#consequences) you'll see that there are features of the D language which are not supported. Therefore, libraries that use such features (e.g. std.format, std.array) are also not supported, and that is why you are encountering such errors. There are some features of Phobos which can be used in betterC builds, but you're going to find that it's hit-and-miss. Mike You don't understand my question and don't read code. I ask about compile time evaluation (`format` used inside `mixin` that means it must be computed at compile time). I know that I can't use many features with betterC at runtime.
Is betterC affect to compile time?
Hello everyone!
I try build this code with betterC
import core.stdc.stdio;
import std.format : format;
extern(C) int main()
{
mixin(format!`enum str = "%s\0";`("hello"));
fprintf(stderr, "%s\n", str.ptr);
return 0;
}
but compilation fails
/dlang/dmd/linux/bin64/../../src/phobos/std/format.d(6278):
Error: Cannot use try-catch statements with -betterC
/dlang/dmd/linux/bin64/../../src/phobos/std/format.d(6308):
Error: template instance `std.format.checkFormatException!("enum
str = \"%s\\0\";", string)` error instantiating
onlineapp.d(6):instantiated from here: format!("enum str
= \"%s\\0\";", string)
/dlang/dmd/linux/bin64/../../src/phobos/std/format.d(6311):
while evaluating: static assert(!e)
/dlang/dmd/linux/bin64/../../src/phobos/std/array.d(3204): Error:
TypeInfo cannot be used with -betterC
Is this a bug?
https://run.dlang.io/is/TG1uhg
Re: usable @nogc Exceptions with Mir Runtime
Thanks for your work!
Example
===
///
@safe pure nothrow @nogc
unittest
{
import mir.exception;
import mir.format;
try throw new MirException(stringBuf() << "Hi D" << 2 <<
"!" << getData);
catch(Exception e) assert(e.msg == "Hi D2!");
}
===
I don't understand why you choose C++ format style instead of
D-style format?
Re: serialport v1.0.0
On Wednesday, 9 May 2018 at 14:41:45 UTC, Andrea Fontana wrote: On Sunday, 6 May 2018 at 22:02:05 UTC, Oleg B wrote: Stable version of serialport package * Blocking `SerialPortBlk` for classic usage * Non-blocking `SerialPortNonBlk` and `SerialPortFR` for usage in fibers or in vibe-d * Variative initialization and configuration * Hardware flow control config flag Doc: http://serialport.dpldocs.info/v1.0.0/serialport.html Dub: http://code.dlang.org/packages/serialport Git: https://github.com/deviator/serialport I wonder if someone can benchmark serialport lib against this test: http://codeandlife.com/2012/07/03/benchmarking-raspberry-pi-gpio-speed/ I think it's different things. serialport is wrap around system calls, it's not control hardware directly. You could be misled by the phrase about 'hardware flow control': is't set on or off using of RTS and CTS pins of UART. Firmware control RTS and CTS pins directly. http://www.brainboxes.com/faq/items/what-is-rts--cts-hardware-flow-control-
serialport v1.0.0
Stable version of serialport package * Blocking `SerialPortBlk` for classic usage * Non-blocking `SerialPortNonBlk` and `SerialPortFR` for usage in fibers or in vibe-d * Variative initialization and configuration * Hardware flow control config flag Doc: http://serialport.dpldocs.info/v1.0.0/serialport.html Dub: http://code.dlang.org/packages/serialport Git: https://github.com/deviator/serialport
betterC and noboundscheck
Hello. I try compile simple example:
import core.stdc.stdio;
import std.algorithm : min;
extern (C) void main()
{
char[256] buf;
buf[] = '\0';
auto str = "hello world";
auto ln = min(buf.length, str.length);
buf[0..ln] = str[0..ln];
printf("%s\n", buf.ptr);
}
rdmd -betterC bettercarray2.d
and get error:
/tmp/.rdmd-1000/rdmd-bettercarray2.d-435C14EC3DAF09FFABF8ED6919B624C1/objs/bettercarray2.o:
In function `main':
bettercarray2.d:(.text.main[main]+0xbc): undefined reference to
`_d_arraycopy'
collect2: error: ld returned 1 exit status
Error: linker exited with status 1
If I understand correctly _d_arraycopy is part of druntime and it
check bounds of array access.
If I add -noboundscheck flag all works fine.
dmd version is 2.076.1
Why -betterC flag not 'include' -noboundscheck flag?
It's bug or in some cases it's useful?
Re: RAII in betterC
On Monday, 20 November 2017 at 18:14:46 UTC, Nick Treleaven wrote: On Monday, 20 November 2017 at 17:13:37 UTC, Oleg B wrote: Hello. I know about some implementation issues http://forum.dlang.org/thread/nqctbzhrdldmnffch...@forum.dlang.org What work must be done for fix it? For what time is it scheduled? Looks like Walter is working on it: https://github.com/dlang/dmd/pull/7304 https://github.com/dlang/dmd/pull/7305 Cool! Thanks!
RAII in betterC
Hello. I know about some implementation issues http://forum.dlang.org/thread/nqctbzhrdldmnffch...@forum.dlang.org What work must be done for fix it? For what time is it scheduled?
Re: call Pascal DLL functions from D
On Wednesday, 25 October 2017 at 03:36:54 UTC, Adam D. Ruppe wrote: I'd suggest just trying it and seeing if the functions return what you expect. Unfortunately they returns unexpected codes. Otherwise I wouldn't post question here. I go here then I have no idea to resolve problem.
Re: call Pascal DLL functions from D
On Wednesday, 25 October 2017 at 04:30:12 UTC, Basile B. wrote: On Wednesday, 25 October 2017 at 03:12:56 UTC, Oleg B wrote: 2. `array[A..B] of TFoo` is `TFoo[B-A+1]` (static array) No A-B. In Pascal the upper bound of a range (like here but i'm not sure this i called like that in the grammar) or of a slice is inclusive. alias HarmonicArray = OneHarmonic[49]; 48 ! Most likely the problem is the array length. If I wrote `array[5..7] of ...` I get array that can be indexed by `5`, `6` and `7`, right? It means that array have 3 elements. If A=5, B=7 then length of array is B-A+1, 7-5+1=3. In my case I have [1..49] and [2..50] ranges: 49-1+1=49, 50-2+1=49. I don't understand why length must be 48... In any case I tried 48 and CheckSignalData function returns other error code, but it point to current field too (incorrect value of coefs - it can be if floating point value is badly read).
call Pascal DLL functions from D
Hello. I have DLL written on Pascal and "headers" for use it
(types and functions signatures definitions). How I can port
"headers" to D?
Calling convention is `stdcall` (`extern (Windows)` for D),
arguments of some functions is structs of structs and etc with
static array fields:
```Pascal
type
TOneHarmonic = record
Koef: Single;
Angle: Single;
end;
THarmonicsArray = array[2..50] of TOneHarmonic;
TInterharmonicsArray = array[1..49] of TOneHarmonic;
TVoltageCurrentOneFaza = record
KalibKoef: Single;
IncludeMainFreq: Boolean;
MainFreqVoltCur: TOneHarmonic;
Harmonics: THarmonicsArray;
Interharmonics: TInterharmonicsArray;
end;
TVoltageCurrent = record
Enable: Boolean;
NominalID: Byte;
Faza_A: TVoltageCurrentOneFaza;
Faza_B: TVoltageCurrentOneFaza;
Faza_C: TVoltageCurrentOneFaza;
end;
TSignal = record
HasInterharmonics: Boolean;
Voltage: TVoltageCurrent;
Current: TVoltageCurrent;
...
end;
...
```
in other file
```Pascal
function CheckSignalData(SignalData: PUserSignalData): Word;
stdcall; external SIGNALK2MDLL;
```
PUserSignalData is pointer to TUserSignalData, first field of
TUserSignalData is Signal, other fields is pointers to other types
If I understand correctly
1. `Single` is `float` in D, `Byte` is `byte`, `Boolean` is
`bool`, `Word` is `ushort`
2. `array[A..B] of TFoo` is `TFoo[B-A+1]` (static array)
Can I rewrite records to structs like this?
```d
alias Word = short;
alias Single = float;
alias Byte = byte;
alias Boolean = bool;
struct OneHarmonic
{
Single coef;
Single angle;
}
alias HarmonicArray = OneHarmonic[49];
// TVoltageCurrentOneFaza
struct PhaseInfo
{
// Must I align fields and/or structs?
Single calibCoef;
Boolean includeMainFreq;
OneHarmonic mainFreqVoltCur;
HarmonicArray harmonics; // Can I replace Pascal static
arrays with D static arrays?
HarmonicArray interharmonics;
}
// TVoltageCurrent
struct ChannelInfo
{
Boolean enable;
Byte nominalID;
PhaseInfo[3] phase; // Can I replace 3 fields to static array?
}
struct Signal
{
Boolean hasInterharmonics;
ChannelInfo voltage;
ChannelInfo current; // #1
...
}
```
In this case I have error about current values (#1) and I think I
badly rewrite Pascal records to D structs (ChannelInfo,
PhaseInfo, OneHarmonic) and lose alignments and/or something else.
PS original pascal naming is very bad, I know
Re: non-block reading from pipe stdout
On Tuesday, 3 October 2017 at 12:32:43 UTC, kdevel wrote: IMHO a program should sleep (consume 0 CPU time and 0 energy) if there is nothing to process. This is best accomplished by not polling on a file descriptor in order to check if data has arrived. If your program must yield() there's probably something wrong with the design. I would suggest you put all the filedescriptors into a fd_set an then select(3) on the set. Programs based on fibers can't sleep while wait data and it's not a design problem.
Re: non-block reading from pipe stdout
On Tuesday, 3 October 2017 at 10:45:21 UTC, kdevel wrote:
On Tuesday, 3 October 2017 at 00:22:28 UTC, Oleg B wrote:
but get error "Resource temporarily unavailable".
You get EAGAIN because there is no data available at the time
of reading.
From the manpage of read:
ERRORS
EAGAIN Non-blocking I/O has been selected using
O_NONBLOCK and no data
was immediately available for reading.
I found only one way: C-style
auto pp = pipeShell(updaterScriptCommand, Redirect.all,
null, Config.none, workDir);
import core.sys.posix.unistd : read;
import core.stdc.errno;
import core.sys.posix.fcntl;
int fd = pp.stdout.fileno;
int flags = fcntl(fd, F_GETFL, 0);
flags |= O_NONBLOCK;
fcntl(fd, F_SETFL, flags); // C-style setting file config
char[256] buf;
while (!tryWait(pp.pid).terminated)
{
auto cnt = read(fd, buf.ptr, buf.length); // C-style
reading
if (cnt == -1 && errno == EAGAIN) // C-style error
checking
yield();
else if (cnt > 0)
{
doSomething(buf[0..cnt]);
yield();
}
}
Re: non-block reading from pipe stdout
On Tuesday, 3 October 2017 at 10:45:21 UTC, kdevel wrote: On Tuesday, 3 October 2017 at 00:22:28 UTC, Oleg B wrote: but get error "Resource temporarily unavailable". You get EAGAIN because there is no data available at the time of reading. From the manpage of read: ERRORS EAGAIN Non-blocking I/O has been selected using O_NONBLOCK and no data was immediately available for reading. And I can't check this without using exception handling?
non-block reading from pipe stdout
Hello. I run program through std.process.pipeShell and want to read from it stdout in loop. How do this non-blocking? I try int fd = p.stdout.fileno; int flags = fcntl(fd, F_GETFL, 0); flags |= O_NONBLOCK; fcntl(fd, F_SETFL, flags); but get error "Resource temporarily unavailable".
betterC and struct destructors
Hello. I try using destructor in betterC code and it's work if outer function doesn't return value (void). Code in `scope (exit)` works as same (if func is void all is ok). In documentation I found https://dlang.org/spec/betterc.html#consequences 12 paragraph: Struct deconstructors. Why struct destructor need Druntime? Compiler must simply past call of destructor before exit from scope or return statement. Where is Druntime here (dynamic allocations, pointers to scopes and other)? I think struct destructor must work in betterC code. Otherwise it will be one step to be likeC, not betterC.
Re: Automatic function body writing howto?
On Wednesday, 16 August 2017 at 22:48:59 UTC, Meta wrote: It's hard to tell offhand but I would recommend that you extract the inner string into a function that generates that string, allowing you to print out the finished product before mixing it in. It's have a same result...
Automatic function body writing howto?
I want declare only signature of function and build body code by
CTFE.
module mdl;
import std.stdio;
import std.traits;
import std.string;
enum autofnc;
@autofnc
{
int foo(int);
int bar(int);
}
void main()
{
writeln(foo(12));
}
mixin cfuncR;
mixin template cfuncR()
{
mixin impl!(getSymbolsByUDA!(mdl, autofnc));
mixin template impl(funcs...)
{
static if (funcs.length == 1)
{
mixin("pragma(msg, typeof(%1$s)); // !!! here I get
_error_
ReturnType!%1$s %1$s(Parameters!%1$s vals) { return vals[0] *
2; }".format(__traits(identifier, funcs[0]));
}
else
{
mixin impl!(funcs[0..$/2]);
mixin impl!(funcs[$/2..$]);
}
}
}
I get this output:
/usr/include/dmd/phobos/std/traits.d-mixin-7671(7671):
Deprecation: mdl.object is not visible from module traits
/usr/include/dmd/phobos/std/traits.d-mixin-7671(7671):
Deprecation: mdl.std is not visible from module traits
mdl.d-mixin-29(30): Error: template instance
std.traits.ReturnType!(foo) does not match template declaration
ReturnType(func...) if (func.length == 1 && isCallable!func)
mdl.d-mixin-29(30): Error: template instance Parameters!foo does
not match template declaration Parameters(func...) if
(func.length == 1 && isCallable!func)
_error_
mdl.d(34): Error: mixin mdl.cfuncR!().impl!(foo, bar).impl!(foo)
error instantiating
mdl.d-mixin-29(30): Error: template instance
std.traits.ReturnType!(bar) does not match template declaration
ReturnType(func...) if (func.length == 1 && isCallable!func)
mdl.d-mixin-29(30): Error: template instance Parameters!bar does
not match template declaration Parameters(func...) if
(func.length == 1 && isCallable!func)
_error_
mdl.d(35): Error: mixin mdl.cfuncR!().impl!(foo, bar).impl!(bar)
error instantiating
mdl.d(23): Error: mixin mdl.cfuncR!().impl!(foo, bar) error
instantiating
mdl.d(19): Error: mixin mdl.cfuncR!() error instantiating
Failed: ["dmd", "-v", "-o-", "mdl.d", "-I."]
I think 'template instance std.traits.ReturnType!(foo) does not
match template declaration' because 'foo' is '_error_' on it's
instancing moment. But I don't understand why 'foo' is '_error_'.
But if I replace '%1$s' in building function name to '_%1$s'
pragma(msg, foo) works normal and compiler behavior is
predictable (defined '_foo', but 'foo' has no body and can't
linked):
/usr/include/dmd/phobos/std/traits.d-mixin-7671(7671):
Deprecation: mdl.object is not visible from module traits
/usr/include/dmd/phobos/std/traits.d-mixin-7671(7671):
Deprecation: mdl.std is not visible from module traits
int(int)
int(int)
/usr/include/dmd/phobos/std/traits.d-mixin-7671(7671):
Deprecation: mdl.object is not visible from module traits
/usr/include/dmd/phobos/std/traits.d-mixin-7671(7671):
Deprecation: mdl.std is not visible from module traits
int(int)
int(int)
/tmp/.rdmd-1000/rdmd-mdl.d-9F3ADBC813DCE463C0EFA2CA038B009E/objs/mdl.o: In
function `_Dmain':
mdl.d:(.text._Dmain+0xa): undefined reference to `_D3mdl3fooFiZi'
collect2: error: ld returned 1 exit status
Error: linker exited with status 1
But if I wrote this code by hands:
ReturnType!foo foo(Parameters!foo vals) { return vals[0] * 2; }
ReturnType!bar bar(Parameters!bar vals) { return vals[0] * 2; }
all works fine!!
What am I doing wrong?
dmd 2.074
ldc 1.3.0 (main compiler, because can cross compile to arm)
Re: LDC 1.3.0-beta2
On Monday, 12 June 2017 at 17:49:46 UTC, kinke wrote: Hi everyone, LDC 1.3.0-beta2, the LLVM-based D compiler, is available for download! This release is based on the 2.073.2 frontend and standard library and supports LLVM 3.5-4.0. It's been a while since beta1, so besides numerous fixes there are also new features. Change log and downloads: https://github.com/ldc-developers/ldc/releases/tag/v1.3.0-beta2 Regards, kinke You plain build armhf version, like for 1.1.0? Or will it never happen again?
Re: ushort calls byte overload
On Tuesday, 30 May 2017 at 21:42:03 UTC, Daniel Kozak wrote:
Compiler do many assumptions (it is sometimes useful).
but if compiler find one-to-one correspondence it don't make
assumptions, like here?
import std.stdio;
void f(ushort u)
{
writeln("ushort");
}
void f(ubyte u)
{
writeln("ubyte");
}
void main()
{
ushort y = 0;
immutable ushort x = 0;
f(y);
f(x);
}
RESULT IS:
ushort
ushort
or it can?
Re: ushort calls byte overload
and this is unexpected for me too immutable ushort y = 0; foo(y); // byte
ushort calls byte overload
Hello. I have this code
import std.stdio;
void foo(byte a) { writeln(typeof(a).stringof); }
void foo(short a) { writeln(typeof(a).stringof); }
void foo(int a) { writeln(typeof(a).stringof); }
void main()
{
foo(0); // int, and byte if not define foo(int)
foo(ushort(0)); // byte (unexpected for me)
foo(cast(ushort)0); // byte (unexpected too)
foo(cast(short)0); // short
foo(short(0)); // short
ushort x = 0;
foo(x); // short
}
Is this a bug or I don't understand something?
Enums and immutables
Hello. I found strange behavior while casting enum array and
immutable array.
import std.stdio;
void main()
{
enum arr = cast(ubyte[])[0,0,0,1,0,0,0,2,0,0,0,3,0,0,0,4];
auto arr1 = cast(void[])arr;
immutable arr2 = cast(immutable(void)[])arr;
enum arr3 = cast(void[])arr;
writeln(cast(ushort[])arr1); // [0, 256, 0, 512, 0, 768, 0,
1024]
writeln(cast(ushort[])arr2); // [0, 256, 0, 512, 0, 768, 0,
1024]
writeln(cast(ushort[])arr3); // [0, 0, 0, 1, 0, 0, 0, 2, 0,
0, 0, 3, 0, 0, 0, 4]
}
I think it's related to representation of enums by compiler as
#define.
It's right? It's behavior by design?
getSymbolsByUDA toSymbols error instantiating
Hello. I have this code:
```d
import std.traits;
enum myuda;
class A { @myuda int x; }
class B : A
{
@myuda int some;
void foo() { foreach (s; getSymbolsByUDA!(typeof(this),
myuda)) {} }
}
void main() { (new B).foo(); }
```
And have this error:
```
% rdmd uda_symbols.d
/usr/include/dmd/phobos/std/traits.d-mixin-7250(7250): Error:
template instance AliasSeq!(some, x) AliasSeq!(some, x) is nested
in both B and A
/usr/include/dmd/phobos/std/traits.d(7259): Error: template
instance std.traits.getSymbolsByUDA!(B, myuda).toSymbols!("some",
"x") error instantiating
uda_symbols.d(10):instantiated from here:
getSymbolsByUDA!(B, myuda)
```
If I understand correctly it's happens because code in std.traits
can't choose between A.x and B.x, but I don't understand why.
It's a bug or it's has a more complex base?
Package visibility strange behaviour
Hello. Is this behavior normal, or it's a bug? And if it's normal
why it's normal? I want to use function with `package` visibility
in same package where it's defined, but I don't.
```d
module package_visible;
package void foo() { }
void main() { foo(); }
```
```
% rdmd package_visible.d
package_visible.d(3): Error: function package_visible.foo is not
accessible from module package_visible
Failed: ["dmd", "-v", "-o-", "package_visible.d", "-I."]
```
dmd version v2.073.1
Re: How to get the name for a Tid
On Wednesday, 23 November 2016 at 21:04:38 UTC, Christian Köstlin wrote: std.concurrency contains the register function to associate a name with a Tid. This is stored internally in an associative array namesByTid. I see no accessors for this. Is there a way to get to the associated names of a Tid? Thanks, Christian I have a same problem and I use workaround with manualy register threads and my own list of threads names. I think it's a little mistake and can be changed in dmd updates in the near future.
Re: Cross-compile with LDC
On Wednesday, 8 February 2017 at 16:21:49 UTC, kinke wrote: On Wednesday, 8 February 2017 at 14:57:41 UTC, Oleg B wrote: Hello all! I want to build ldc cross compiller. I found this instruction https://wiki.dlang.org/LDC_cross-compilation_for_ARM_GNU/Linux, but I have some doubts: will it works with ldc-1.1.0? Particularly interested in the patch https://gist.githubusercontent.com/claudemr/3367c13095b15d449b1591eb38d098d9/raw/3517a5db2228e57da9dd8880a82d6bfe6f0e38f1/ldc_1.0.0_gnu_arm. It's for ldc-1.0.0 and sources can be changed. Maybe somewhere I found patch for ldc-1.1.0? Maybe someone already build cross ldc for linux x86_64?)) Hi Oleg, first of all, we have an LDC forum/NG (http://forum.dlang.org/group/ldc) which would be more appropriate for your question. The referenced LDC patch is derived from https://github.com/ldc-developers/ldc/pull/1317, which hasn't been merged yet (but will be in not-too-distant future). As you haven't explicitly specified what your target platform is, I can only assume that it's 32-bit ARM. With a vanilla LDC, cross-compiling to ARM with its double-precision reals will only work correctly if your LDC host compiler uses double-precision reals too, which isn't the case for Linux x86(_64), but for Windows. My LDC PR would make it work with a non-Windows x86(_64) host too, but only if the target (not the host) uses at most double-precision reals. Thank you, in future I create new question about ldc in special forum. Yes, my target arch is ARMv7 (rpi2 and beaglebone) and ARMv8 (rpi3). If I understand correctly with vanilla LDC I can't cross-compiling from host linux-x86_64, but with your patch I can. Right? Maximum precision for ARMv7(8) is 64bit doubles, for x86_64 is 80bit reals. If I use your patch must I use in my programs only double or I can stay real in existing code?
Cross-compile with LDC
Hello all! I want to build ldc cross compiller. I found this instruction https://wiki.dlang.org/LDC_cross-compilation_for_ARM_GNU/Linux, but I have some doubts: will it works with ldc-1.1.0? Particularly interested in the patch https://gist.githubusercontent.com/claudemr/3367c13095b15d449b1591eb38d098d9/raw/3517a5db2228e57da9dd8880a82d6bfe6f0e38f1/ldc_1.0.0_gnu_arm. It's for ldc-1.0.0 and sources can be changed. Maybe somewhere I found patch for ldc-1.1.0? Maybe someone already build cross ldc for linux x86_64?))
Re: Array operation with overlapping
On Tuesday, 8 November 2016 at 14:52:41 UTC, Steven Schveighoffer wrote: On 11/8/16 3:29 AM, Oleg Gorbunov wrote: I am new in D, but saw some strage behavour. Overlapping is detected for + and * array operation, but not for - and /. I would say this is a bug. The behavior should be consistent. -Steve OK, I'll report this bug at https://issues.dlang.org
Array operation with overlapping
I am new in D, but saw some strage behavour.
Overlapping is detected for + and * array operation, but not for
- and /.
import std.stdio;
void main()
{
int[] slice = [2, 2, 2, 2];
int[] slice2 = slice[0 .. $ - 1];
int[] slice3 = slice[1 .. $];
writeln("slice before: ", slice);
writeln("slice2 before: ", slice2);
writeln("slice3 before: ", slice3);
const auto cmd = "slice3[] = slice2[] + slice3[];";
writeln( "cmd: ", cmd );
mixin( cmd );
writeln("slice after : ", slice);
writeln("slice2 after : ", slice2);
writeln("slice3 after : ", slice3);
}
When this code is run at 'dlang.org'
slice before: [2, 2, 2, 2]
slice2 before: [2, 2, 2]
slice3 before: [2, 2, 2]
cmd: slice3[] = slice2[] + slice3[];
object.Error@(0): Overlapping arrays in vector operation: 8
byte(s) overlap of 12
??:? nothrow @safe void
rt.util.array._enforceNoOverlap(const(char[]), ulong, ulong,
const(ulong)) [0x44f7f3]
??:? _arraySliceSliceAddSliceAssign_i [0x44c1b6]
??:? _Dmain [0x4408bb]
??:?
_D2rt6dmain211_d_run_mainUiPPaPUAAaZiZ6runAllMFZ9__lambda1MFZv
[0x44c8a6]
??:? void rt.dmain2._d_run_main(int, char**, extern (C) int
function(char[][])*).tryExec(scope void delegate()) [0x44c7f0]
??:? void rt.dmain2._d_run_main(int, char**, extern (C) int
function(char[][])*).runAll() [0x44c862]
??:? void rt.dmain2._d_run_main(int, char**, extern (C) int
function(char[][])*).tryExec(scope void delegate()) [0x44c7f0]
??:? _d_run_main [0x44c761]
??:? main [0x44a389]
??:? __libc_start_main [0x40d80a14]
If change + to -
const auto cmd = "slice3[] = slice2[] - slice3[];";
When it is run at 'dlang.org'
slice before: [2, 2, 2, 2]
slice2 before: [2, 2, 2]
slice3 before: [2, 2, 2]
cmd: slice3[] = slice2[] - slice3[];
slice after : [2, 0, -2, -4]
slice2 after : [2, 0, -2]
slice3 after : [0, -2, -4]
new XML and JSON libs and replacement of std.net.curl
Hello. In std.xml docs I read that is deprecated, and std.net.curl can be deprecated too (not remember here I read about std.net.curl). About std.json I read what it's has slow (de)serialization. What I must use at this time? vibe.data.json has evolution https://github.com/s-ludwig/std_data_json, but, if I correctly understood, they are not compatible and I can't use stdx.data.json in vibe. For XML I found this project https://github.com/lodo1995/experimental.xml. Is this really candidate to std, or author just called it as he want? As replacement of std.net.curl I found https://github.com/ikod/dlang-requests. Who know's about this lib? Is this good replacement of std.net.curl? Maybe if I need json and http requests I must fully use vibe for these things? Vibe not resolve xml question =( I want to use minimal count of dependencies...
Re: DLang users telegram group
On Tuesday, 8 December 2015 at 17:51:01 UTC, Kingsley wrote: On Monday, 30 November 2015 at 10:58:34 UTC, Quentin Ladeveze wrote: Hi everybody, I just created a Telegram group for dlang users : https://telegram.me/joinchat/BeLaugMz35ZxQUq2fks4YQ Feel free to join ! says the link has expired yet another english group https://telegram.me/dlangTelegram
const and mutable opApply's
Hello
struct WTable
{
...
private enum opApply_body = q{
if( smt )
{
foreach( f; 0 .. size-1 )
foreach( t; f+1 .. size )
if( auto r = dlg(f,t,data[getIndex(f,t)]) )
return r;
}
else
{
foreach( f; 0 .. size )
foreach( t; 0 .. size )
{
if( f == t ) continue;
if( auto r = dlg(f,t,data[getIndex(f,t)]) )
return r;
}
}
return 0;
};
int opApply( int delegate(size_t,size_t,T val) dlg ) const {
mixin( opApply_body ); }
int opApply( int delegate(size_t,size_t,ref T val) dlg ) {
mixin( opApply_body ); }
}
How I can rewrite this code without mixin's and with one (maybe
inout) opApply?
Re: LDC+Dub+Vibe.d work on SmartOS 64bit now
On Friday, 10 June 2016 at 21:40:22 UTC, flamencofantasy wrote: In another one I get the following; ]# dub Performing "debug" build using ldc2 for x86_64. vibe-d:utils 0.7.28: target for configuration "library" is up to date. vibe-d:data 0.7.28: target for configuration "library" is up to date. vibe-d:core 0.7.28: building configuration "libevent"... ../../../.dub/packages/vibe-d-0.7.28/vibe-d/source/vibe/core/core.d(570): Error: static assert "Unsupported OS!" ldc2 failed with exit code 1. My pull request with fix this issue merged to version 0.7.29. Use please version 0.7.29 or higher.
Re: LDC+Dub+Vibe.d work on SmartOS 64bit now
On Friday, 10 June 2016 at 21:40:22 UTC, flamencofantasy wrote: ld: fatal: library -levent: not found I think need install libevent. In howto on https://wiki.dlang.org/LDC%2BDub%2BVibe.d_on_SmartOS_64bit. I think misprint in line: # pkgin in binutils gmake cmake scmgit python35 autoconf gcc49 gcc49-libs unzip libconfig livevent change "livevent" -> "libevent".
Re: LDC+Dub+Vibe.d work on SmartOS 64bit now
On Wednesday, 8 June 2016 at 15:35:32 UTC, Johan Engelen wrote: Are you interested in running a buildbot for LDC on your platform to detect issues early? Yes, interested. But our servers can't to use for this purpose. They use for data acquisition from electrical substation's automation system and do not have access from Internet for sequrity reasons.
Re: LDC+Dub+Vibe.d work on SmartOS 64bit now
On Wednesday, 8 June 2016 at 08:43:59 UTC, Joakim wrote: Have you run the standard library's tests? There was a thread last summer about this: http://forum.dlang.org/thread/zhcduibirwprgbzqk...@forum.dlang.org We haven't run library's tests. What right way to run this tests? But: We ported our sufficiently big server application from Linux to SmartOS x64. All application tests is OK. Application working now on testing server in production like regime under full load. And it's working fine. We're planning to use it in production in future. Vibe.d simple http/https/web test applications work fine too.
Pointer to std.container.Array data for C library
Hello! Is it possible to get pointer to a data in std.container.Array like .ptr from an array? I need to pass a pointer to some C function (from DerelictGL3 binding) and avoid GC allocation. Thank you!
Re: Pointer to std.container.Array data for C library
On Friday, 28 August 2015 at 18:21:04 UTC, John Colvin wrote: On Friday, 28 August 2015 at 17:45:21 UTC, Oleg wrote: Hello! Is it possible to get pointer to a data in std.container.Array like .ptr from an array? I need to pass a pointer to some C function (from DerelictGL3 binding) and avoid GC allocation. Thank you! I'm pretty sure you can just take the address of the first element, e.g. a[0] or a.front I've tried, it throws core.exception.RangeError@/usr/include/dmd/phobos/std/container/array.d(571): Range violation If I make an array from the Array container with foreach ad pass it's .ptr - it works
Re: Pointer to std.container.Array data for C library
On Friday, 28 August 2015 at 18:46:23 UTC, Oleg wrote: I found solution. I call length instead of reserve. It calls ensureInitialized and everything works fine. By default, Array won't initialize store. Oh, reserve calls it too. My mistake. I found the problem, that's because I passed an empty Array (like Array!int.init).
Re: Pointer to std.container.Array data for C library
On Friday, 28 August 2015 at 18:40:33 UTC, John Colvin wrote: On Friday, 28 August 2015 at 18:31:00 UTC, Oleg wrote: On Friday, 28 August 2015 at 18:21:04 UTC, John Colvin wrote: On Friday, 28 August 2015 at 17:45:21 UTC, Oleg wrote: Hello! Is it possible to get pointer to a data in std.container.Array like .ptr from an array? I need to pass a pointer to some C function (from DerelictGL3 binding) and avoid GC allocation. Thank you! I'm pretty sure you can just take the address of the first element, e.g. a[0] or a.front I've tried, it throws core.exception.RangeError@/usr/include/dmd/phobos/std/container/array.d(571): Range violation That's unexpected. Could you provide a full example that does this? I found solution. I call length instead of reserve. It calls ensureInitialized and everything works fine. By default, Array won't initialize store.
rt_finalize question
Hello. In object.di rt_finalize calls for class objects in
destroy func.
I not found it in dmd source on github and not found in druntime
sources.
I think rt_finalize must call dtors for object and base classes,
but I think that's not all. Or if it all has it code logic
problems?
void myDestroy(T)( T obj ) if( is( T == class ) )
{
mixin( callDtor!( obj.stringof,
TypeTuple!(T,BaseClassesTuple!T) ) );
}
string callDtor( string name, BCT... )() @property
{
import std.string;
static if( BCT.length == 1 ) return ; // Object has no dtor
else
return format( %s.%s.__dtor();\n, name,
BCT[0].stringof.split(.)[$-1] ) ~
callDtor!(name, BCT[1..$]);
}
function callDtor generate string like this
obj.C.__dtor();
obj.B.__dtor();
obj.A.__dtor();
for class model
class A{}
class B : A {}
class C : B {}
I want understand why destroy for class objects call extern(C)
function rt_finalize (not pure, with gc, can except), and how it
works (rt_finalize gets void*).
Re: rt_finalize question
I found it https://github.com/D-Programming-Language/druntime/blob/master/src/rt/lifetime.d#L1350 Creates new questions. Why it's extern(C)? What must do collectHandler function? If I understand correctly monitor relates to multithreading control (Mutex?).
Re: using D without GC
On Monday, 8 June 2015 at 13:37:40 UTC, Marc Schütz wrote: On Monday, 8 June 2015 at 12:24:56 UTC, Oleg B wrote: I guess you should follow andrei's post about new allocators! Can you get link to this post? These are some of his posts: http://forum.dlang.org/thread/mku0n4$s35$1...@digitalmars.com http://forum.dlang.org/thread/mkl1eh$1mdl$2...@digitalmars.com http://forum.dlang.org/thread/mjig8h$2rgi$1...@digitalmars.com http://forum.dlang.org/thread/mjdcep$11ri$1...@digitalmars.com http://forum.dlang.org/thread/mj3p2j$2qva$1...@digitalmars.com http://forum.dlang.org/thread/mir0lg$2l74$1...@digitalmars.com http://forum.dlang.org/thread/min9k8$9r9$1...@digitalmars.com Thank! Can you say how long wait (on average) to experimental modules will cease be an experimental and will be part of phobos? At next release or it unknown?
Re: pure format
On Thursday, 4 June 2015 at 16:21:54 UTC, Jonathan M Davis wrote:
On Thursday, 4 June 2015 at 14:33:39 UTC, Oleg B wrote:
Hello. I not found realization of pure format function (in
phobos it not pure) and write minimal custom realization.
https://github.com/dexset/desstdx/blob/master/source/des/stdx/pformat.d#L472
Now it works with numbers and strings, but in future I improve
it.
Maybe my realization can help someone =)
Contained in the dub package
http://code.dlang.org/packages/desstdx
If pure format exists tell about it, please.
std.format.format should be pure if its arguments have pure
toString methods or are built-in types. There may be
implementation issues preventing it for one reason or another
(I don't know), but if so, then that's a bug that needs to be
fixed. Regardless, there should be no need for a separate
format function which is pure.
- Jonathan M Davis
I think toString for float must be pure, but in practice it's not.
import std.stdio;
import std.string;
string test( float abc ) pure { return format( abc: % 6.3f, abc
); }
void main() { writeln( test( 13.3 ) ); }
$ rdmd purefmtfloating.d
purefmtfloating.d(3): Error: pure function 'purefmtfloating.test'
cannot call impure function 'std.format.format!(char,
float).format'
Failed: [dmd, -v, -o-, purefmtfloating.d, -I.]
DMD64 v2.067.1
It's a bug? I read what std.format.format using libc sprintf
http://www.digitalmars.com/d/archives/digitalmars/D/learn/std.conv.to_purity_68957.html
and if it try it's not a bug...
pure format
Hello. I not found realization of pure format function (in phobos it not pure) and write minimal custom realization. https://github.com/dexset/desstdx/blob/master/source/des/stdx/pformat.d#L472 Now it works with numbers and strings, but in future I improve it. Maybe my realization can help someone =) Contained in the dub package http://code.dlang.org/packages/desstdx If pure format exists tell about it, please.
wrong rounding
Hello. I found unexpected (for me) behavior of rounding double
values at casting to ulong:
$ cat roundtest.d
import std.stdio;
void main()
{
double a = 10, b = 0.01;
writeln( int: , cast(int)(a/b) );
writeln( uint: , cast(uint)(a/b) );
writeln( long: , cast(long)(a/b) );
writeln( ulong: , cast(ulong)(a/b) );
}
$ rdmd roundtest.d
int: 1000
uint: 1000
long: 1000
ulong: 999 - WTF?? ---
$ dmd --version
DMD64 D Compiler v2.067.1
Copyright (c) 1999-2014 by Digital Mars written by Walter Bright
$ ldc2 roundtest.d ./roundtest
int: 1000
uint: 1000
long: 1000
ulong: 1000 --- Ok
$ ldc2 --version
LDC - the LLVM D compiler (0.15.2-beta1):
based on DMD v2.066.1 and LLVM 3.6.0
Default target: x86_64-unknown-linux-gnu
Host CPU: core-avx-i
http://dlang.org - http://wiki.dlang.org/LDC
Registered Targets:
x86- 32-bit X86: Pentium-Pro and above
x86-64 - 64-bit X86: EM64T and AMD64
$ uname -a
Linux lenovo 4.0.4-201.fc21.x86_64 #1 SMP Thu May 21 15:58:47 UTC
2015 x86_64 x86_64 x86_64 GNU/Linux
have it behavior explain? can I use casting in dmd for rounding
values or it not safe?
Re: Set null as function array parameter
On Monday, 12 January 2015 at 15:59:43 UTC, Adam D. Ruppe wrote: Why are you using ref? Take that off and you can pass any array, including null, with ease. Because dynamic arrays are passed by value to functions. Will it make another copy of array, if I'll pass array by value? Looks like it won't (I've checked pointers), but I read in wiki (http://en.wikibooks.org/wiki/D_%28The_Programming_Language%29/d2/Strings_and_Dynamic_Arrays#Passing_Dynamic_Arrays_to_Functions) that it will copy structure that contains the -pointer to the first element- and the length is copied and passed. Does it mean something else? maybe i don't understand it correctly.
Set null as function array parameter
Hello. How can I call a function with null as parameter, which I
don't want to set. For example:
void foo(ref int[] param1) {}
I can't call this function like:
foo(null);
Is it possible to set default value for an array parameter or
pass null/empty array? I can create empty array and pass it, but
it looks ugly:
int[] x;
foo(x);
Thanks.
Re: Set null as function array parameter
On Monday, 12 January 2015 at 16:44:42 UTC, ketmar via
Digitalmars-d-learn wrote:
nope, it means exactly what is written there. except that
dynamic array
is represented by struct like this:
struct {
void *dataptr;
size_t itemCount;
}
this is what D calls dynamic array, and this is what passed
by value:
struct with two members. dynamic array contents are *not* a
part of
dynamic array type.
yes, this is confusing.
Thank you.
Contract programming
Is this behavior normal or it's bug?
[code]
import std.stdio;
class A
{
float func( float x )
in
{
assert( x 0 );
stderr.writeln( A.func in block );
}
body
{
stderr.writeln( A.func body block );
return x / 3;
}
}
class B : A
{
override float func( float x )
in
{
assert( x 10 );
stderr.writeln( B.func in block );
}
body
{
stderr.writeln( B.func body block );
return x * 3;
}
}
void main()
{
auto a = new B;
auto v = a.func( 3.14 );
}
[output]
A.func in block
B.func body block
In class B 'in' block not called, but if add 'out' block it
called both for A and B classes.
Re: UDA and mixins
struct FooPasted(Args...){}
class A
{
mixin foo;
void func1() @mark { ... }
void func2( int x, string a ) @mark { ... }
}
must change to:
class A
{
void func1() @mark { ... }
void func2( int x, string a ) @mark { ... }
FooPasted!() func1_mark;
FooPasted!(int,string) func2_mark;
}
Re: release building problem
renaming struct from 'Client' to 'MClient' resolve question
release building problem
When I build my program with release flag I get an errors, in
debug build all works
.dub/build/application-profile-linux.posix-x86_64-dmd-AD20DEA65FEE410217932549C1D262EF/ftree.o:
In function
`_D3des4flow5event5Event27__T6__ctorTS6client6ClientZ6__ctorMFNcmKxS6client6ClientZS3des4flow5event5Event':
/home/deviator/workspace/cdsd/fractaltree/descore/import/des/flow/event.d:62:
undefined reference to
`_D6object43__T4_dupTxS6client6ClientTyS6client6ClientZ4_dupFNaNbAxS6client6ClientZAyS6client6Client'
.dub/build/application-profile-linux.posix-x86_64-dmd-AD20DEA65FEE410217932549C1D262EF/ftree.o:
In function
`_D3des4util5pdata5PData27__T6__ctorTS6client6ClientZ6__ctorMFNaNbNcNfKxS6client6ClientZS3des4util5pdata5PData':
/home/deviator/workspace/cdsd/fractaltree/descore/import/des/util/pdata.d:40:
undefined reference to
`_D6object43__T4_dupTxS6client6ClientTyS6client6ClientZ4_dupFNaNbAxS6client6ClientZAyS6client6Client'
.dub/build/application-profile-linux.posix-x86_64-dmd-AD20DEA65FEE410217932549C1D262EF/ftree.o:
In function `_D4sock2we6SockWE10emitEventsMFZv':
/home/deviator/workspace/cdsd/fractaltree/src/sock/we.d:134:
undefined reference to
`_D6object43__T4_dupTxS6client6ClientTyS6client6ClientZ4_dupFNaNbAxS6client6ClientZAyS6client6Client'
It may be a compiler bug, but now I must find workaround.
From mangle
`_D6object43__T4_dupTxS6client6ClientTyS6client6ClientZ4_dupFNaNbAxS6client6ClientZAyS6client6Client'
I can understood what no 'dup(Client)' function. But I dont
understand where it calls. Ctors flow.event.Event and
des.util.pdata.PData
looks like 'this(T)( ref const(T) val )' and dont use 'dup'
function. Whey use 'idup' function for 'T[]'.
struct Client
{
size_t id;
vec3 orient; // struct vec3 { float[3] data; }
vec3 motion;
float p1;
}
Where I must find solution?
Re: release building problem
the same result of building release or profile
const class
Hello. I can't find siple way to realization this behavior:
[code]
class A
{
A parent;
void someFunc() const { }
void parentCall() const
{
const(A) cur = this;
while( cur )
{
cur.someFunc();
cur = cur.parent;
}
}
}
[/code]
error: cannot modify const expression cur
how create variable that store const object and can be changed to
other const object?
unclear compile error for struct with string template
[code]
void doSome(size_t N, T, string AS)( vec!(N,T,AS) v ) { }
struct vec(size_t N, T, string AS) { T[N] data; }
void main() { doSome( vec!(3,float,xyz)([1,2,3]) ); }
[/code]
compile with new dmd v2.066.0 and get error:
Error: template opbin.doSome(ulong N, T, string AS)(vec!(N, T,
AS) v) specialization not allowed for deduced parameter AS
what does it mean?
on dmd v2.065 it worked well
code without string template parameter work well on dmd v2.066.0
[code]
void doSome(size_t N, T)( vec!(N,T) v ) { }
struct vec(size_t N, T) { T[N] data; }
void main() { doSome( vec!(3,float)([1,2,3]) ); }
[/code]
Re: unclear compile error for struct with string template
On Monday, 25 August 2014 at 11:41:28 UTC, bearophile wrote:
Oleg B:
[code]
void doSome(size_t N, T, string AS)( vec!(N,T,AS) v ) { }
struct vec(size_t N, T, string AS) { T[N] data; }
void main() { doSome( vec!(3,float,xyz)([1,2,3]) ); }
[/code]
compile with new dmd v2.066.0 and get error:
Error: template opbin.doSome(ulong N, T, string AS)(vec!(N, T,
AS) v) specialization not allowed for deduced parameter AS
what does it mean?
See also:
struct Vec(size_t N, T, alias string AS) {
T[N] data;
}
void doSome(size_t N, T, alias string AS)(Vec!(N, T, AS) v) {}
void main() {
auto v = Vec!(3, float, xyz)([1, 2, 3]);
doSome(v);
}
(Note that in D the names of types and structs start with an
upper case).
Bye,
bearophile
Does it mean that I need write alias for all arrays in template
parameters or only strings?
Re: unclear compile error for struct with string template
and when I minimal fix my libs with this issue compiler fails without any output... =( % gdb dmd (gdb) run -unittest matrix.d vector.d Starting program: /usr/bin/dmd -unittest matrix.d vector.d [Thread debugging using libthread_db enabled] Using host libthread_db library /lib64/libthread_db.so.1. [New Thread 0x77ec9700 (LWP 29224)] [Thread 0x77ec9700 (LWP 29224) exited] Program received signal SIGSEGV, Segmentation fault. 0x0046c39a in ctfeInterpret(Expression*) () (gdb) bt #0 0x0046c39a in ctfeInterpret(Expression*) () #1 0x00457012 in deduceType(RootObject*, Scope*, Type*, ArrayTemplateParameter**, ArrayRootObject**, unsigned int*, unsigned long)::DeduceType::visit(TypeInstance*) () #2 0x0044e304 in deduceType(RootObject*, Scope*, Type*, ArrayTemplateParameter**, ArrayRootObject**, unsigned int*, unsigned long) () #3 0x0045224f in deduceType(RootObject*, Scope*, Type*, ArrayTemplateParameter**, ArrayRootObject**, unsigned int*, unsigned long)::DeduceType::visit(TypeStruct*) () #4 0x00455e80 in deduceType(RootObject*, Scope*, Type*, ArrayTemplateParameter**, ArrayRootObject**, unsigned int*, unsigned long)::DeduceType::visit(Expression*) () #5 0x0044e32c in deduceType(RootObject*, Scope*, Type*, ArrayTemplateParameter**, ArrayRootObject**, unsigned int*, unsigned long) () #6 0x00458251 in TemplateDeclaration::deduceFunctionTemplateMatch(TemplateInstance*, Scope*, FuncDeclaration*, Type*, ArrayExpression**) () #7 0x0045caf1 in functionResolve(Match*, Dsymbol*, Loc, Scope*, ArrayRootObject**, Type*, ArrayExpression**)::ParamDeduce::fp(void*, Dsymbol*) () #8 0x004dd577 in overloadApply(Dsymbol*, void*, int (*)(void*, Dsymbol*)) () #9 0x0045c401 in functionResolve(Match*, Dsymbol*, Loc, Scope*, ArrayRootObject**, Type*, ArrayExpression**) () #10 0x004e0343 in resolveFuncCall(Loc, Scope*, Dsymbol*, ArrayRootObject**, Type*, ArrayExpression**, int) () #11 0x004d9522 in CallExp::semantic(Scope*) () #12 0x004eef56 in ExpInitializer::inferType(Scope*) () #13 0x004b08ad in VarDeclaration::semantic(Scope*) () #14 0x004c1f7a in DeclarationExp::semantic(Scope*) () #15 0x0043cd3b in ExpStatement::semantic(Scope*) () #16 0x004479a6 in CompoundStatement::semantic(Scope*) () #17 0x004e5e2a in FuncDeclaration::semantic3(Scope*) () #18 0x00407b28 in Module::semantic3() () #19 0x004051bc in tryMain(unsigned long, char const**) () #20 0x00338be21b45 in __libc_start_main (main=0x406e60 main, argc=4, ubp_av=0x7fffdc28, init=optimized out, fini=optimized out, rtld_fini=optimized out, stack_end=0x7fffdc18) at libc-start.c:274 #21 0x00402739 in _start ()
Re: SQLite3
On Wednesday, 7 May 2014 at 06:21:10 UTC, Jack wrote: void* NotUsedAtAll, // Null variable int argc, // What? char** results, // Results? char** columnNames //Column Names? You can read about this agruments on http://www.sqlite.org/c3ref/exec.html
ctor for shared and immutable structs
why this code get errors?
[code]
/* 1 */struct PData
/* 2 */{
/* 3 */immutable(ubyte)[] data; // ???
/* 4 */pure this(T)( in T val ) { }
/* 5 */}
/* 6 */
/* 7 */unittest
/* 8 */{
/* 9 */immutable(ubyte)[] data_a = [1,2,3];
/* 10 */ubyte[] data_b = [1,2,3];
/* 11 */auto a = PData( data_a );
/* 12 */auto ca = const PData( data_a );
/* 13 */auto ia = immutable PData( data_a );
/* 14 */auto sa = shared PData( data_a );
/* 15 */auto sca = shared const PData( data_a );
/* 16 */
/* 17 */auto b = PData( data_b.idup );
/* 18 */auto cb = const PData( data_b.idup );
/* 19 */auto ib = immutable PData( data_b );
/* 20 */auto sb = shared PData( data_b );
/* 21 */auto scb = shared const PData( data_b );
/* 22 */}
[/code]
$ dmd -unittest -main -run purector.d
purector.d(13): Error: template purector.PData.__ctor cannot
deduce function from argument types !()(immutable(ubyte)[])
immutable, candidates are:
purector.d(4):purector.PData.__ctor(T)(in T val)
purector.d(14): Error: template purector.PData.__ctor cannot
deduce function from argument types !()(immutable(ubyte)[])
shared, candidates are:
purector.d(4):purector.PData.__ctor(T)(in T val)
purector.d(15): Error: template purector.PData.__ctor cannot
deduce function from argument types !()(immutable(ubyte)[])
shared const, candidates are:
purector.d(4):purector.PData.__ctor(T)(in T val)
why cannot deduce pure ctor?
if i change line 3
/* 3 */immutable(ubyte)[] data; // ???
to
/* 3 */ubyte[] data; // ???
all works
why i can't use immutable data in this case?
const ref type as return value
[code]
import std.stdio;
struct A { int val; }
A a;
class X { const ref A func() { return a; } }
void main()
{
auto x = new X;
x.func().val = 5;
writeln( a );
}
[/code]
in this case 'const' mean 'const method' and variable 'a' changed.
if write
[code]
class X { const(ref A) func() { return a; } }
[/code]
$ dmd -run crtr.d
crtr.d(7): Error: basic type expected, not ref
crtr.d(7): Error: found 'ref' when expecting ')'
crtr.d(7): Error: semicolon expected, not ')'
crtr.d(7): Error: Declaration expected, not ')'
crtr.d(7): Error: unrecognized declaration
Only one way I find for workaround this
[code]
alias const ref A crA;
class X { crA func() { return a; } }
[/code]
But I think should exist more elegant solution.
interface and class inheritance
[code]
import std.stdio;
interface A { void funcA(); }
class B { final void funcA() { writeln( B.funcA() ); } }
class C: B, A { }
void main()
{
auto c = new C;
c.funcA();
}
[code/]
$ dmd -run interface.d
interface.d(6): Error: class interface.C interface function 'void
funcA()' is not implemented
if swap A and B
[code]
class C: A, B { }
[code/]
$ dmd -run interface.d
interface.d(6): Error: class interface.C base type must be
interface, not interface.B
how to workaround this without change in class B and interface A?
Re: interface and class inheritance
On Thursday, 14 November 2013 at 21:45:11 UTC, Agustin wrote:
On Thursday, 14 November 2013 at 21:42:38 UTC, Agustin wrote:
On Thursday, 14 November 2013 at 21:20:57 UTC, Oleg B wrote:
[code]
import std.stdio;
interface A { void funcA(); }
class B { final void funcA() { writeln( B.funcA() ); } }
class C: B, A { }
void main()
{
auto c = new C;
c.funcA();
}
[code/]
$ dmd -run interface.d
interface.d(6): Error: class interface.C interface function
'void funcA()' is not implemented
if swap A and B
[code]
class C: A, B { }
[code/]
$ dmd -run interface.d
interface.d(6): Error: class interface.C base type must be
interface, not interface.B
how to workaround this without change in class B and
interface A?
Try
interface A {
final void funcA();
}
class B {
final void funcA() { writeln( B.funcA() ); }
}
class C: B, A { }
Oh sorry i mean
interface A {
void funcA();
}
class B : A {
final void funcA() { writeln( B.funcA() ); }
}
class C : B {
}
we can't change anything in class B
C/C++ struct interfacing
Hello.
I want use one struct in two language.
How to declare the same structure in different languages?
D code: calling C++ function with my struct
code
extern(C++)
{
struct vec(size_t N, T=float)
{ // line 6
alias vec!(N,T) thistype;
T[N] data;
auto opBinary(string op)( in thistype rhs ) const
{
thistype ret;
foreach( i; 0 .. N ) ret.data[i] = data[i] +
rhs.data[i];
return ret;
}
}
void cppcall( vec!(3,float) d );
}
void main()
{
vec!3 a, b;
a.data[0] = 10;
a.data[1] = 7;
a.data[2] = 3;
b.data[0] = 13;
b.data[1] = 9;
b.data[2] = 4;
cppcall( a + b );
}
/code
C++ code: use struct data
code
#include cstdio
struct vec
{
float data[3];
};
void cppcall( vec d )
{
printf( %f %f %f\n, d.data[0], d.data[1], d.data[2] );
}
/code
compilation failed with unclear error
$ g++ -c ctypestest.cpp -o ctypestest.o
$ dmd ctypestest.d ctypestest.o -ofctypestest
ctypestest.d(6): Error: struct ctypestest.vec!(3, float).vec C++
static variables not supported
Re: [OT] Why mobile web apps are slow
Thanks for the link. In my experience, mobile networking is slow in general. When I run Speedtest on my phone vs. a laptop sitting right next to it, the phone has a fraction of the bandwidth of the laptop. So there's even more at issue than raw JS performance. Sean is right, this is only one side of problem and very often not a major, another side is mobile network bandwidth and infrastructure load. It is usual for corporate offices/cities (sharing), weak signal conditions and movement you will have quite limited bandwidth even for LTE/3G cases.
Re: Why UTF-8/16 character encodings?
On Wednesday, 29 May 2013 at 22:44:17 UTC, Walter Bright wrote: I still think it's a bad idea, but it's obvious people want it in D, so it'll stay. (Also note that I meant using ASCII, not necessarily english.) Good, thanks, restrictions definetelly can and should be applied per project, like for druntime/Phobos.
Re: Why UTF-8/16 character encodings?
On Tuesday, 28 May 2013 at 01:34:47 UTC, Walter Bright wrote: Why? You said previously that you'd love to support extended operators ;) Extended operators, yes. Non-ascii identifiers, no. BTW, this is one of big D advantage, take into account some day D could be used for teaching in schools where pupils still doesn't know English somewhere outside US/GB. It is much easy to start with localized Ids. Please keep unicode in language.
Re: Vote for std.uni
Yes Thanks, Oleg.
Re: Stable D version?
On Sunday, 28 April 2013 at 23:11:30 UTC, Mehrdad wrote: On Sunday, 28 April 2013 at 12:01:58 UTC, Paulo Pinto wrote: Which vendors have switched to C++ for systems programming? Paolo probably had MS in mind which didn't release WinRT for C.
Re: [OT] Information about Access to site You requested denied by Federal Law
2013/3/24 thedeemon dl...@thedeemon.com On Saturday, 23 March 2013 at 12:40:37 UTC, Denis Shelomovskij wrote: I get this message instead of some sites content: Access to site You requested denied by Federal Law E.g. see this IT blog by Felipe Contreras: http://felipec.wordpress.com/ For those not speaking Russian. The story is: for the last few months there's been a Russian analog of Chinese Great Firewall building, it filters some sites, and recently many sites on wordpress.com got banned just by coincidence having same IPs as some really banned sites. Availability of those sites is ISP-dependent, as different ISPs may implement filtering a bit differently. It is complete OT. In many countries there are some limitations. BTW, site to which Denis pointed works perfectly for me (Russia, NN, Beeline). Oleg.
Re: Migrating dmd to D?
On Thursday, 28 February 2013 at 00:37:50 UTC, Andrei Alexandrescu wrote: Hello, Walter and I have had a long conversation about the next radical thing to do to improve D's standing. Like others in this community, we believe it's a good time to consider bootstrapping the compiler. Having the D compiler written in D has quite a few advantages, among which taking advantages of D's features and having a large codebase that would be its own test harness. .. Strategically it is great idea, but tactically there are probably more attractive (for new users also) areas to improve toolchain: - GC. Current solution is just like java's from 90th. Hit all OS and mostly everybody. Makes so hard to develop solutions with soft-RT requirements, like games and multimedia processing. - Linker for Windows. optlink is far away from current industry requirements/standarts. Using coff for Win64 is good but we have now dependency on external toolchain. Unfortunatelly C++/CLI was excluded from SDK'12, it probably shows new trend. How long SDK'10 will be available for download and compatible with next Windows? Big risk. Good article on what can replace C from Damien, including D - http://damienkatz.net/2013/01/follow_up_to_the_unreasonable.html
Re: Another opportunity for a major design win has presented itself
On Thursday, 7 February 2013 at 20:16:03 UTC, Walter Bright wrote: No, I can't say who it is at this time. Sorry. But it is a huge opportunity for us. To get the design win, we need to: (a) get dynamic linking and loading to work (b) improve language safety without degrading efficiency (c) improve quality as always Of course, these things benefit pretty much all D users anyway. Initially, (a) is the most important. That is cool, but what is the target platform - Win/Lin, 32/64? Oleg.
Re: D Language, chained null checks and the Maybe monad - article
On Tuesday, 5 February 2013 at 20:13:51 UTC, Michael wrote: Inspired by. It's noted at top) Yep, but not in English. Michael, it is good code, may be it make sense to add it into std.functional after some refactoring?
Re: Incorporating D
On Friday, 25 January 2013 at 23:24:54 UTC, Andrei Alexandrescu wrote: Thank you for asking. We have been strongly focused on quality improvement since last year but judging from this thread we need to work more on it (and the derived community sentiment). Andrei And that is true, during 2012 and by now 1495 bug fixed and closed: http://d.puremagic.com/issues/buglist.cgi?chfieldto=Nowquery_format=advancedchfield=bug_statuschfieldfrom=2012-01-01bug_status=RESOLVEDbug_status=VERIFIEDbug_status=CLOSEDcomponent=DMDproduct=D That is just so Awesome! Great thanks to everybody involved! The bad news is there are still some TDPL bugs: http://d.puremagic.com/issues/buglist.cgi?keywords=tdplquery_format=advancedkeywords_type=allwordsbug_status=NEWbug_status=ASSIGNEDbug_status=REOPENEDcomponent=DMDproduct=D These probably would require more attention because TDPL is the _only_ printed source of the language. Not so big amount although, so using D per TDPL looks pretty safe. Oleg.
Re: Trust about D programming.
On Wednesday, 23 January 2013 at 21:14:26 UTC, Paulo Pinto wrote: Many developers have no idea that modern CPUs do lots of things that invalidate the concept of C as a high level assembler. Paolo, the most important features of C makes it high-level assembler it are pointer and its arithmetics. What hell modern CPUs doing wrong with it? Thanks, Oleg.
recursive function call at compile time
Hello.
I want use recursion, but in my situation compiler doesn't
correct work.
import std.stdio;
struct MyStruct(uint K)
{
real[K] data;
auto getSmaller()
{
MyStruct!(K-1) ret;
foreach( no, ref d; ret.data )
d = data[no];
return ret;
}
real recursionAlgo()
{
static if( K == 1 ) return data[0];
else
{
real sum = 0;
foreach( i; 1 .. K )
sum += getSmaller().recursionAlgo();
return sum;
}
}
}
void main()
{
MyStruct!(5) a;
a.data = [ 1, 2, 3, 4, 5 ];
writeln( a.recursionAlgo() );
}
at compile time i have errors
./recursion.d(7): Error: index 4294967295 overflow for static
array
./recursion.d(7): Error: index 4294967294 overflow for static
array
etc
i think it's happens because compiler call 'recursionAlgo()'
where it should not be ( K == 1 )
how to turn off compile time calculation in this part of code?
Re: D vs C++11
On Saturday, 3 November 2012 at 12:46:18 UTC, Erèbe wrote: Nearly no support in vim (my editor of choice), a Plugin for eclipse wich force you to stick with an older version, a Visual studio plugin where you need to buy a liscence in order to have the IDE. The only viable choice for me is the plugin for monodevelop which is really great but no debugger (assert is enough for now). Hi Erèbe, you can use free Visual Studio Shell with VisualD.. http://www.microsoft.com/en-us/download/details.aspx?id=30670 Thanks, Oleg.
Re: Unexpected OPTLINK Termination while building dwt helloworld
Optlink can be very fragile sometime with these details, it's a known problem. There's already an alpha available of DMD that uses the Microsoft linker. Jacob, it is 64-bit only, not sure DWT is ready for 64. Oleg.
overriding private interface methods
Hello. How to override private methods?
import std.stdio, std.conv;
interface abcInterface
{
private double private_func();
public final double func() { return private_func(); }
}
class abcImpl: abcInterface
{
override private double private_func() { return 3.14; } //#1
}
void main()
{
auto abc = new abcImpl;
writeln( abc.func() );
}
This code generate error
#1 Error: function inter.abcImpl.private_func cannot override a
non-virtual function
This private method (private_func) is 'private' because it must
call only in final interface methods (func)
